WO2002066623A2 - Regulation of human phosphatidic acid-preferring phospholipase a1 - Google Patents
Regulation of human phosphatidic acid-preferring phospholipase a1 Download PDFInfo
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- WO2002066623A2 WO2002066623A2 PCT/EP2002/001684 EP0201684W WO02066623A2 WO 2002066623 A2 WO2002066623 A2 WO 2002066623A2 EP 0201684 W EP0201684 W EP 0201684W WO 02066623 A2 WO02066623 A2 WO 02066623A2
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- polypeptide
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- phospholipase
- preferring phospholipase
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/16—Hydrolases (3) acting on ester bonds (3.1)
- C12N9/18—Carboxylic ester hydrolases (3.1.1)
- C12N9/20—Triglyceride splitting, e.g. by means of lipase
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y301/00—Hydrolases acting on ester bonds (3.1)
- C12Y301/01—Carboxylic ester hydrolases (3.1.1)
- C12Y301/01032—Phospholipase A1 (3.1.1.32)
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
Definitions
- the invention relates to the regulation of human phosphatidic acid-preferring phospholipase Al.
- Phospholipase Al is a hydro lytic enzyme that catalyzes removal of the acyl group from position 1 of lecithin to form lysolecithin. There is a need in the art to identify related enzymes, which can be regulated to provide therapeutic effects.
- a test compound is contacted with a phosphatidic acid-preferring phospholipase Al polypeptide comprising an amino acid sequence selected from the group consisting of:
- amino acid sequences which are at least about 88% identical to the amino acid sequence shown in SEQ ID NO: 2 and; the amino acid sequence shown in SEQ ID NO: 2;
- Binding between the test compound and the phosphatidic acid-preferring phospholipase Al polypeptide is detected.
- a test compound which binds to the phosphatidic acid-preferring phospholipase Al polypeptide is thereby identified as a potential agent for decreasing extracellular matrix degradation.
- the agent can work by decreasing the activity of the phosphatidic acid-preferring phospholipase Al.
- Another embodiment of the invention is a method of screening for agents which decrease extracellular matrix degradation.
- a test compound is contacted with a poly- nucleotide encoding a phosphatidic acid-preferring phospholipase Al polypeptide, wherein the polynucleotide comprises a nucleotide sequence selected from the group consisting of:
- nucleotide sequences which are at least about 50% identical to the nucleotide sequence shown in SEQ ED NO: 1 and; the nucleotide sequence shown in SEQ ID NO: 1;
- Binding of the test compound to the polynucleotide is detected.
- a test compound which binds to the polynucleotide is identified as a potential agent for decreasing extracellular matrix degradation.
- the agent can work by decreasing the amount of the phosphatidic acid-preferring phospholipase Al through interacting with the phosphatidic acid-preferring phospholipase Al mRNA.
- Another embodiment of the invention is a method of screening for agents which regulate extracellular matrix degradation.
- a test compound is contacted with a phosphatidic acid-preferring phospholipase Al polypeptide comprising an amino acid sequence selected from the group consisting of:
- amino acid sequences which are at least about 88% identical to the amino acid sequence shown in SEQ ID NO: 2 and; the amino acid sequence shown in SEQ ID NO: 2.
- a phosphatidic acid-preferring phospholipase Al activity of the polypeptide is detected.
- a test compound which increases phosphatidic acid-preferring phospholipase Al activity of the polypeptide relative to phosphatidic acid-preferring phospholipase Al activity in the absence of the test compound is thereby identified as a potential agent for increasing extracellular matrix degradation.
- a test compound which decreases phosphatidic acid-preferring phospholipase Al activity of the polypeptide relative to phosphatidic acid-preferring phospholipase Al activity in the absence of the test compound is thereby identified as a potential agent for decreasing extracellular matrix degradation.
- Yet another embodiment of the invention is a method of screening for agents which decrease extracellular matrix degradation.
- a test compound is contacted with a phosphatidic acid-preferring phospholipase Al product of a polynucleotide which comprises a nucleotide sequence selected from the group consisting of:
- nucleotide sequences which are at least about 50% identical to the nucleotide sequence shown in SEQ TD NO: 1 and; the nucleotide sequence shown in SEQ ID NO: 1 ;
- Binding of the test compound to the phosphatidic acid-preferring phospholipase Al product is detected.
- a test compound which binds to the phosphatidic acid- preferring phospholipase Al product is thereby identified as a potential agent for decreasing extracellular matrix degradation.
- Still another embodiment of the invention is a method of reducing extracellular matrix degradation.
- a cell is contacted with a reagent which specifically binds to a polynucleotide encoding a phosphatidic acid-preferring phospholipase Al polypeptide or the product encoded by the polynucleotide, wherein the polynucleotide comprises a nucleotide sequence selected from the group consisting of:
- nucleotide sequences which are at least about 50% identical to the nucleotide sequence shown in SEQ ID NO: 1 and; the nucleotide sequence shown in SEQ ID NO: 1 ;
- Phosphatidic acid-preferring phospholipase Al activity in the cell is thereby decreased.
- the invention thus provides a human phosphatidic acid-preferring phospholipase Al that can be used to identify test compounds that may act, for example, as activators or inhibitors at the enzyme's active site.
- Human phosphatidic acid-preferring phospho- lipase Al and fragments thereof also are useful in raising specific antibodies that can block the enzyme and effectively reduce its activity.
- Fig. 1 shows the DNA-sequence encoding a phosphatidic acid-preferring phospholipase Al Polypeptide (SEQ ID NO: 1).
- Fig. 2 shows the amino acid sequence deduced from the DNA-sequence of Fig.1 (SEQ ID NO: 2).
- Fig. 3 shows the amino acid sequence of the protein identified by trembl AF045022*AF045022_1 (SEQ ID NO: 3).
- Fig. 4 shows the DNA-sequence encoding a phosphatidic acid-preferring phospholipase Al Polypeptide (SEQ ID NO: 4).
- Fig. 5 shows the DNA-sequence encoding a phosphatidic acid-preferring phospholipase Al Polypeptide (SEQ ID NO: 5).
- Fig. 6 shows the DNA-sequence encoding a phosphatidic acid-preferring phospholipase Al Polypeptide (SEQ ID NO: 6).
- Fig. 7 shows the DNA-sequence encoding a phosphatidic acid-preferring phospholipase Al Polypeptide (SEQ ID NO: 7).
- Fig. 8 shows the DNA-sequence encoding a phosphatidic acid-preferring phospholipase Al Polypeptide (SEQ ID NO: 8).
- Fig. 9 shows the BLASTP - alignment of 425 (SEQ ID NO: 2) against trembl* AF045022* AF045022 (SEQ ID NO: 3).
- Fig. 10 shows the BLASTN SNP alignments.
- Fig. 11 shows the Genewise analysis.
- Fig. 12 shows the Expression profile of phosphatidic acid-preferring phospholipase Al.
- Fig. 13 shows the Expression profile of phosphatidic acid-preferring phospho- lipase Al.
- Fig. 14 shows the Expression profile of phosphatidic acid-preferring phospholipase Al.
- the invention relates to an isolated polynucleotide from the group consisting of:
- amino acid sequences which are at least about 88% identical to the amino acid sequence shown in SEQ ID NO: 2 and; the amino acid sequence shown in SEQ TD NO: 2;
- a polynucleotide which represents a fragment, derivative or allelic variation of a polynucleotide sequence specified in (a) to (d) and encodes a phosphatidic acid-preferring phospholipase Al polypeptide.
- a novel phosphatidic acid-preferring phospholipase Al paticularly a human phosphatidic adid- preferring phospholipase Al, can be used in therapeutic methods to treat a CNS disorder, a genitourinary disorder, a cardiovascular disorder, asthma, cancer, COPD or a hematological disorder.
- Human phosphatidic acid-preferring phospholipase Al comprises the amino acid sequence shown in SEQ ID NO: 2.
- a coding sequence for human phosphatidic acid-preferring phospholipase Al is shown in SEQ ID NO: 1. This sequence is located on chromosome 14.
- Related ESTs (SEQ ID NOS: 4-8) are expressed in testis, lymph, pooled tissues, infant brain, primitive neuroectoderm, nervous tumor, and fetal liver, spleen, and bone. Expression in CNS tissues indicates that this protein may play a role in brain-specific disorders, such as Alzheimer's disease and Parkinson's disease.
- Human phosphatidic acid-preferring phospholipase Al is 88% identical over 876 amino acids to phosphatidic acid-preferring phospholipase Al (FIG. 1).
- Human phosphatidic acid-preferring phospholipase Al contains an amino acid sequence, Ser535-His-Ser-Leu-Gly539, which resembles the consensus sequence containing the active serine nucleophile present in most lipases, GXSXG.
- Human phosphatidic acid-preferring phospholipase Al of the invention is expected to be useful for the same purposes as previously identified phosphatidic acid- preferring phospholipase Al enzymes.
- Human phosphatidic acid-preferring phospholipase Al is believed to be useful in therapeutic methods to treat disorders such as CNS disorders, genitourinary disorders, cardiovascular disorders, and hematological disorders.
- Human phosphatidic acid-preferring phospholipase Al also can be used to screen for human phosphatidic acid-preferring phospholipase Al activators and inhibitors.
- Human phosphatidic acid-preferring phospholipase Al polypeptides according to the invention comprise at least 6, 10, 15, 20, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650,
- a phosphatidic acid-preferring phospholipase Al polypeptide of the invention therefore can be a portion of a phosphatidic acid-preferring phospholipase Al protein, a full-length phosphatidic acid-preferring phospholipase
- Al protein or a fusion protein comprising all or a portion of a phosphatidic acid- preferring phospholipase Al protein.
- naturally or non- naturally occurring phosphatidic acid-preferring phospholipase Al polypeptide variants have amino acid sequences which are at least about 88, 90, 96, 96, 98, or
- Percent identity between a putative phosphatidic acid-preferring phospholipase Al polypeptide variant and an amino acid sequence of SEQ ID NO: 2 is determined using the Blast2 alignment program (Blosum62, Expect 10, standard genetic codes).
- Variations in percent identity can be due, for example, to amino acid substitutions, insertions, or deletions.
- Amino acid substitutions are defined as one for one amino acid replacements. They are conservative in nature when the substituted amino acid has similar structural and/or chemical properties. Examples of conservative replacements are substitution of a leucine with an isoleucine or valine, an aspartate with a glutamate, or a threonine with a serine.
- Amino acid insertions or deletions are changes to or within an amino acid sequence. They typically fall in the range of about 1 to 5 amino acids. Guidance in determining which amino acid residues can be substituted, inserted, or deleted without abolishing biological or immunological activity of a phosphatidic acid-preferring phospholipase Al polypeptide can be found using computer programs well known in the art, such as DNASTAR software. Whether an amino acid change results in a biologically active phosphatidic acid-preferring phospholipase Al polypeptide can readily be determined by assaying for phospholipase Al activity, as described for example, in U.S. Patent 5,538,874.
- Fusion proteins are useful for generating antibodies against phosphatidic acid- preferring phospholipase Al polypeptide amino acid sequences and for use in various assay systems. For example, fusion proteins can be used to identify proteins that interact with portions of a phosphatidic acid-preferring phospholipase Al poly- peptide. Protein affinity chromatography or library-based assays for protein-protein interactions, such as the yeast two-hybrid or phage display systems, can be used for this purpose. Such methods are well known in the art and also can be used as drug screens.
- a phosphatidic acid-preferring phospholipase Al polypeptide fusion protein comprises two polypeptide segments fused together by means of a peptide bond.
- the first polypeptide segment comprises at least 6, 10, 15, 20, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 700, 725, 750, 775, 800, 825, 850, or 852 contiguous amino acids of SEQ DO NO: 2 or of a biologically active variant, such as those described above.
- the first polypeptide segment also can comprise full-length phosphatidic acid-preferring phospholipase Al protein.
- the second polypeptide segment can be a full-length protein or a protein fragment.
- Proteins commonly used in fusion protein construction include ⁇ -galactosidase, ⁇ - glucuronidase, green fluorescent protein (GFP), autofluorescent proteins, including blue fluorescent protein (BFP), glutathione-S-transferase (GST), luciferase, horseradish peroxidase (HRP), and chloramphenicol acetyltransferase (CAT).
- epitope tags are used in fusion protein constructions, including histidine (His) tags, FLAG tags, influenza hemagglutinin (HA) tags, Myc tags, VSV-G tags, and thioredoxin (Trx) tags.
- fusion constructions can include maltose binding protein (MBP), S-tag, Lex a DNA binding domain (DBD) fusions, GAL4 DNA binding domain fusions, and herpes simplex virus (HSV) BP16 protein fusions.
- MBP maltose binding protein
- S-tag S-tag
- GAL4 DNA binding domain fusions GAL4 DNA binding domain fusions
- HSV herpes simplex virus
- a fusion protein also can be engineered to contain a cleavage site located between the phosphatidic acid-preferring phospholipase Al polypeptide-encoding sequence and the heterologous protein sequence, so that the phosphatidic acid-preferring phospholipase Al polypeptide can be cleaved and purified away from the heterologous moiety.
- a fusion protein can be synthesized chemically, as is known in the art.
- a fusion protein is produced by covalently linking two polypeptide segments or by standard procedures in the art of molecular biology.
- Recombinant DNA methods can be used to prepare fusion proteins, for example, by making a DNA construct which comprises coding sequences selected from SEQ ID NO: 1 in proper reading frame with nucleotides encoding the second polypeptide segment and expressing the DNA construct in a host cell, as is known in the art.
- kits for constructing fusion proteins are available from companies such as Promega Corporation (Madison, WI), Stratagene (La Jolla, CA), CLONTECH (Mountain View, CA), Santa Cruz Biotechnology (Santa Cruz, CA), MBL International Corporation (MIC; Watertown, MA), and Quantum Biotechnologies (Montreal, Canada; 1-888-DNA-KITS). Identification of Species Homologs
- Species homo logs of human phosphatidic acid-preferring phospholipase Al polypeptide can be obtained using phosphatidic acid-preferring phospholipase Al polypeptide polynucleotides (described below) to make suitable probes or primers for screening cDNA expression libraries from other species, such as mice, monkeys, or yeast, identifying cDNAs which encode homologs of phosphatidic acid-preferring phospholipase Al polypeptide, and expressing the cDNAs as is known in the art.
- a phosphatidic acid-preferring phospholipase Al polynucleotide can be single- or double-stranded and comprises a coding sequence or the complement of a coding sequence for a phosphatidic acid-preferring phospholipase Al polypeptide.
- a coding sequence for human phosphatidic acid-preferring phospholipase Al is shown in SEQ ID NO: 1
- nucleotide sequences encoding human phosphatidic acid-preferring phospholipase Al polypeptides as well as homologous nucleotide sequences which are at least about 50, 55, 60, 65, 70, preferably about 75, 90, 96, 98, or 99% identical to the nucleotide sequence shown in SEQ ID NO: 1 or its complement also are phosphatidic acid-preferring phospholipase Al polynucleotides. Percent sequence identity between the sequences of two polynucleotides is determined using computer programs such as ALIGN which employ the FASTA algorithm, using an affine gap search with a gap open penalty of -12 and a gap extension penalty of -2.
- cDNA phosphatidic acid-preferring phospholipase Al polynucleotides that encode biologically active phosphatidic acid- preferring phospholipase Al polypeptides also are phosphatidic acid-preferring phospholipase Al polynucleotides.
- Polynucleotide fragments comprising at least 8, 9, 10, 11, 12, 15, 20, or 25 contiguous nucleotides of SEQ ID NO: 1 or its complement also are phosphatidic acid-preferring phospholipase Al polynucleotides. These fragments can be used, for example, as hybridization probes or as antisense oligonucleotides.
- Variants and homologs of the phosphatidic acid-preferring phospholipase Al polynucleotides described above also are phosphatidic acid-preferring phospholipase Al polynucleotides.
- homologous phosphatidic acid-preferring phospholipase Al polynucleotide sequences can be identified by hybridization of candidate poly- nucleotides to known phosphatidic acid-preferring phospholipase Al polynucleotides under stringent conditions, as is known in the art.
- Species homologs of the phosphatidic acid-preferring phospholipase Al polynucleo- tides disclosed herein also can be identified by making suitable probes or primers and screening cDNA expression libraries from other species, such as mice, monkeys, or yeast.
- Human variants of phosphatidic acid-preferring phospholipase Al polynucleotides can be identified, for example, by screening human cDNA expression libraries. It is well known that the T m of a double-stranded DNA decreases by 1-1.5 °C with every 1% decrease in homology (Bonner et al., J. Mol. Biol. 81, 123 (1973).
- Variants of human phosphatidic acid-preferring phospholipase Al polynucleotides or phosphatidic acid-preferring phospholipase Al polynucleotides of other species can therefore be identified by hybridizing a putative homologous phosphatidic acid- preferring phospholipase Al polynucleotide with a polynucleotide having a nucleo- tide sequence of SEQ ID NO: 1 or the complement thereof to form a test hybrid.
- the melting temperature of the test hybrid is compared with the melting temperature of a hybrid comprising polynucleotides having perfectly complementary nucleotide sequences, and the number or percent of basepair mismatches within the test hybrid is calculated.
- Al polynucleotides or their complements following stringent hybridization and/or wash conditions also are phosphatidic acid-preferring phospholipase Al polynucleotides.
- Stringent wash conditions are well known and understood in the art and are disclosed, for example, in Sambrook et al., MOLECULAR CLONING: A LABORATORY MANUAL, 2d ed., 1989, at pages 9.50-9.51.
- T m of a hybrid between a phosphatidic acid-preferring phospholipase Al polynucleotide having a nucleotide sequence shown in SEQ ID NO: 1 or the complement thereof and a polynucleotide sequence which is at least about 50, preferably about 75, 90, 96, or 98% identical to one of those nucleotide sequences can be calculated, for example, using the equation of Bolton and McCarthy, Proc. Natl. Acad. Sci. U.S.A. 48, 1390 (1962):
- Stringent wash conditions include, for example, 4X SSC at 65°C, or 50% formamide, 4X SSC at 42°C, or 0.5X SSC, 0.1% SDS at 65°C.
- Highly stringent wash conditions include, for example, 0.2X SSC at 65°C.
- a phosphatidic acid-preferring phospholipase Al polynucleotide can be isolated free of other cellular components such as membrane components, proteins, and lipids.
- Polynucleotides can be made by a cell and isolated using standard nucleic acid purification techniques, or synthesized using an amplification technique, such as the polymerase chain reaction (PCR), or by using an automatic synthesizer. Methods for isolating polynucleotides are routine and are known in the art. Any such technique for obtaining a polynucleotide can be used to obtain isolated phosphatidic acid- preferring phospholipase Al polynucleotides.
- restriction enzymes and probes can be used to isolate polynucleotide fragments, which comprise phosphatidic acid-preferring phospholipase Al nucleotide sequences.
- Isolated polynucleotides are in preparations that are free or at least 70, 80, or 90% free of other molecules.
- Human phosphatidic acid-preferring phospholipase Al cDNA molecules can be made with standard molecular biology techniques, using phosphatidic acid-preferring phospholipase Al mRNA as a template. Human phosphatidic acid-preferring phospholipase Al cDNA molecules can thereafter be replicated using molecular biology techniques known in the art and disclosed in manuals such as Sambrook et al. (1989).
- An amplification technique such as PCR, can be used to obtain additional copies of polynucleotides of the invention, using either human genomic DNA or cDNA as a template.
- synthetic chemistry techniques can be used to synthesize phosphatidic acid-preferring phospholipase Al polynucleotides.
- the degeneracy of the genetic code allows alternate nucleotide sequences to be synthesized which will encode a phosphatidic acid-preferring phospholipase Al polypeptide having, for example, an amino acid sequence shown in SEQ ID NO: 2 or a biologically active variant thereof.
- PCR-based methods can be used to extend the nucleic acid sequences disclosed herein to detect upstream sequences such as promoters and regulatory elements.
- restriction-site PCR uses universal primers to retrieve unknown sequence adjacent to a known locus (Sarkar, PCR Methods Applic. 2, 318-322, 1993). Genomic DNA is first amplified in the presence of a primer to a linker sequence and a primer specific to the known region. The amplified sequences are then subjected to a second round of PCR with the same linker primer and another specific primer internal to the first one. Products of each round of PCR are transcribed with an appropriate RNA polymerase and sequenced using reverse transcriptase.
- Inverse PCR also can be used to amplify or extend sequences using divergent primers based on a known region (Triglia et al., Nucleic Acids Res. 16, 8186, 1988). Primers can be designed using commercially available software, such as OLIGO 4.06 Primer
- the method uses several restriction enzymes to generate a suitable fragment in the known region of a gene. The fragment is then circularized by intramolecular ligation and used as a PCR template.
- capture PCR involves PCR amplification of DNA fragments adjacent to a known sequence in human and yeast artificial chromosome DNA (Lagerstrom et al., PCR Methods Applic. 1, 111-119, 1991).
- multiple restriction enzyme digestions and ligations also can be used to place an engineered double-stranded sequence into an unknown fragment of the DNA molecule before performing PCR.
- Randomly-primed libraries are preferable, in that they will contain more sequences which contain the 5' regions of genes. Use of a randomly primed library may be especially preferable for situations in which an oligo d(T) library does not yield a full-length cDNA. Genomic libraries can be useful for extension of sequence into 5' non-transcribed regulatory regions.
- capillary electrophoresis systems can be used to analyze the size or confirm the nucleotide sequence of PCR or sequencing products.
- capillary sequencing can employ flowable polymers for electrophoretic separation, four different fluorescent dyes (one for each nucleotide) that are laser activated, and detection of the emitted wavelengths by a charge coupled device camera.
- Output/light intensity can be converted to electrical signal using appropriate software (e.g. GENOTYPER and Sequence NAVIGATOR, Perkin Elmer), and the entire process from loading of samples to computer analysis and electronic data display can be computer controlled.
- Capillary electrophoresis is especially preferable for the sequencing of small pieces of DNA that might be present in limited amounts in a particular sample.
- Human phosphatidic acid-preferring phospholipase Al polypeptides can be obtained, for example, by purification from human cells, by expression of phosphatidic acid- preferring phospholipase Al polynucleotides, or by direct chemical synthesis.
- Human phosphatidic acid-preferring phospholipase Al polypeptides can be purified from any cell that expresses the polypeptide, including host cells that have been transfected with phosphatidic acid-preferring phospholipase Al expression constructs.
- a purified phosphatidic acid-preferring phospholipase Al polypeptide is separated from other compounds that normally associate with the phosphatidic acid- preferring phospholipase Al polypeptide in the cell, such as certain proteins, carbo- hydrates, or lipids, using methods well-known in the art.
- Such methods include, but are not limited to, size exclusion chromatography, ammonium sulfate fractionation, ion exchange chromatography, affinity chromatography, and preparative gel electrophoresis.
- a preparation of purified phosphatidic acid-preferring phospholipase Al polypeptides is at least 80% pure; preferably, the preparations are 90%, 95%, or 99% pure. Purity of the preparations can be assessed by any means known in the art, such as SDS-polyacrylamide gel electrophoresis.
- the polynucleotide can be inserted into an expression vector that contains the necessary elements for the transcription and translation of the inserted coding sequence.
- Methods that are well known to those skilled in the art can be used to construct expression vectors containing sequences encoding phosphatidic acid-preferring phospholipase Al polypeptides and appropriate transcriptional and translational control elements. These methods include in vitro recombinant DNA techniques, synthetic techniques, and in vivo genetic recombination. Such techniques are described, for example, in Sambrook et al. (1989) and in Ausubel et al., CURRENT PROTOCOLS IN MOLECULAR BIOLOGY, John Wiley & Sons, New York, N.Y., 1989.
- a variety of expression vector/host systems can be utilized to contain and express sequences encoding a phosphatidic acid-preferring phospholipase Al polypeptide.
- microorganisms such as bacteria transformed with recombinant bacteriophage, plasmid, or cosmid DNA expression vectors; yeast transformed with yeast expression vectors, insect cell systems infected with virus expression vectors (e.g., baculovirus), plant cell systems transformed with virus expression vectors (e.g., cauliflower mosaic virus, CaMV; tobacco mosaic virus, TMV) or with bacterial expression vectors (e.g., Ti or pBR322 plasmids), or animal cell systems.
- microorganisms such as bacteria transformed with recombinant bacteriophage, plasmid, or cosmid DNA expression vectors
- yeast transformed with yeast expression vectors insect cell systems infected with virus expression vectors (e.g., baculovirus), plant cell systems transformed with virus expression vectors (e.g., cauliflower mosaic
- control elements or regulatory sequences are those non-translated regions of the vector — enhancers, promoters, 5' and 3' untranslated regions — which interact with host cellular proteins to carry out transcription and translation. Such elements can vary in their strength and specificity. Depending on the vector system and host utilized, any number of suitable transcription and translation elements, including constitutive and inducible promoters, can be used. For example, when cloning in bacterial systems, inducible promoters such as the hybrid lacZ promoter of the BLUESCRTPT phagemid (Stratagene, LaJolla, Calif.) or pSPORTl plasmid (Life Technologies) and the like can be used. The baculovirus polyhedrin promoter can be used in insect cells. Promoters or enhancers derived from the genomes of plant cells
- vectors e.g., heat shock, RUBISCO, and storage protein genes
- plant viruses e.g., viral promoters or leader sequences
- promoters from mammalian genes or from mammalian viruses are preferable. If it is necessary to generate a cell line that contains multiple copies of a nucleotide sequence encoding a phosphatidic acid-preferring phospholipase Al polypeptide, vectors based on SV40 or EBV can be used with an appropriate selectable marker.
- a number of expression vectors can be selected depending upon the use intended for the phosphatidic acid-preferring phospholipase Al polypeptide. For example, when a large quantity of a phosphatidic acid-preferring phospholipase Al polypeptide is needed for the induction of antibodies, vectors which direct high level expression of fusion proteins that are readily purified can be used. Such vectors include, but are not limited to, multifunctional E. coli cloning and expression vectors such as BLUESCRTPT (Stratagene).
- a sequence encoding the phosphatidic acid-preferring phospholipase Al polypeptide can be ligated into the vector in frame with sequences for the amino-terminal Met and the subsequent 7 residues of ⁇ -galactosidase so that a hybrid protein is produced.
- pIN vectors Van
- Heeke & Schuster, J. Biol. Chem. 264, 5503-5509, 1989) or pGEX vectors also can be used to express foreign polypeptides as fusion proteins with glutathione S-transferase (GST).
- GST glutathione S-transferase
- fusion proteins are soluble and can easily be purified from lysed cells by adsorption to glutathione-agarose beads followed by elution in the presence of free glutathione.
- Proteins made in such systems can be designed to include heparin, thrombin, or factor Xa protease cleavage sites so that the cloned polypeptide of interest can be released from the GST moiety at will.
- yeast Saccharomyces cerevisiae a number of vectors containing constitutive or inducible promoters such as alpha factor, alcohol oxidase, and PGH can be used.
- constitutive or inducible promoters such as alpha factor, alcohol oxidase, and PGH.
- sequences encoding phosphatidic acid-preferring phospholipase Al polypeptides can be driven by any of a number of promoters.
- viral promoters such as the 35S and 19S promoters of CaMV can be used alone or in combination with the omega leader sequence from TMV (Takamatsu, EMBO J. 6, 307-311, 1987).
- plant promoters such as the small subunit of RUBISCO or heat shock promoters can be used (Coruzzi et al., EMBO J. 3, 1671-1680, 1984; Broglie et al., Science 224, 838-843, 1984; Winter et al., Results Probl. Cell Differ.
- constructs can be introduced into plant cells by direct DNA transformation or by pathogen-mediated transfection. Such techniques are described in a number of generally available reviews (e.g., Hobbs or Murray, in MCGRAW HILL YEARBOOK OF SCIENCE AND TECHNOLOGY, McGraw Hill, New York, N.Y., pp. 191-196, 1992).
- An insect system also can be used to express a phosphatidic acid-preferring phospho- lipase Al polypeptide.
- Autographa californica nuclear polyhedrosis virus (AcNPV) is used as a vector to express foreign genes in Spodoptera frugiperda cells or in Trichoplusia larvae.
- Sequences encoding phosphatidic acid-preferring phospholipase Al polypeptides can be cloned into a non- essential region of the virus, such as the polyhedrin gene, and placed under control of the polyhedrin promoter.
- phosphatidic acid-preferring phospholipase Al polypeptides will render the polyhedrin gene inactive and produce recombinant virus lacking coat protein.
- the recombinant viruses can then be used to infect S. frugiperda cells or Trichoplusia larvae in which phosphatidic acid- preferring phospholipase Al polypeptides can be expressed (Engelhard et al., Proc. Nat. Acad. Sci. 91, 3224-3227, 1994).
- a number of viral-based expression systems can be used to express phosphatidic acid-preferring phospholipase Al polypeptides in mammalian host cells.
- sequences encoding phosphatidic acid-preferring phospholipase Al polypeptides can be ligated into an adenovirus transcription translation complex comprising the late promoter and tripartite leader sequence. Insertion in a non-essential El or E3 region of the viral genome can be used to obtain a viable virus that is capable of expressing a phosphatidic acid-preferring phospholipase Al polypeptide in infected host cells
- transcription enhancers such as the Rous sarcoma virus (RSN) enhancer, can be used to increase expression in mammalian host cells.
- RSN Rous sarcoma virus
- HACs Human artificial chromosomes
- 6M to 10M are constructed and delivered to cells via conventional delivery methods (e.g., liposomes, polycationic amino polymers, or vesicles).
- Specific initiation signals also can be used to achieve more efficient translation of sequences encoding phosphatidic acid-preferring phospholipase Al polypeptides. Such signals include the ATG initiation codon and adjacent sequences. In cases where sequences encoding a phosphatidic acid-preferring phospholipase Al polypeptide, its initiation codon, and upstream sequences are inserted into the appropriate expression vector, no additional transcriptional or translational control signals may be needed. However, in cases where only coding sequence, or a fragment thereof, is inserted, exogenous translational control signals (including the ATG initiation codon) should be provided. The initiation codon should be in the correct reading frame to ensure translation of the entire insert.
- Exogenous translational elements and initiation codons can be of various origins, both natural and synthetic.
- the efficiency of expression can be enhanced by the inclusion of enhancers which are appropriate for the particular cell system which is used (see Scharf et al., Results Probl. Cell Differ. 20, 125-162, 1994).
- a host cell strain can be chosen for its ability to modulate the expression of the inserted sequences or to process the expressed phosphatidic acid-preferring phospholipase Al polypeptide in the desired fashion.
- modifications of the polypeptide include, but are not limited to, acetylation, carboxylation, glycosylation, phos- phorylation, lipidation, and acylation.
- Post-translational processing which cleaves a
- prepro form of the polypeptide also can be used to facilitate correct insertion, folding and/or function.
- Different host cells that have specific cellular machinery and characteristic mechanisms for post-translational activities e.g. , CHO, HeLa, MDCK, HEK293, and WI38
- ATCC American Type Culture Collection
- Stable expression is preferred for long-term, high-yield production of recombinant proteins.
- cell lines which stably express phosphatidic acid-preferring phospholipase Al polypeptides can be transformed using expression vectors which can contain viral origins of replication and/or endogenous expression elements and a selectable marker gene on the same or on a separate vector. Following the introduction of the vector, cells can be allowed to grow for 1-2 days in an enriched medium before they are switched to a selective medium.
- the purpose of the selectable marker is to confer resistance to selection, and its presence allows growth and recovery of cells which successfully express the introduced phosphatidic acid- preferring phospholipase Al sequences.
- Resistant clones of stably transformed cells can be proliferated using tissue culture techniques appropriate to the cell type. See, for example, ANIMAL CELL CULTURE, R.I. Freshney, ed., 1986.
- herpes simplex virus thymidine kinase (Wigler et al., Cell 11, 223-32, 1977) and adenine phosphoribosyltransferase (Lowy et al, Cell 22, 817-23, 1980) genes which can be employed in tk ⁇ or aprf cells, respectively.
- antimetabolite, antibiotic, or herbicide resistance can be used as the basis for selection.
- dhfr confers resistance to methotrexate (Wigler et al, Proc. Natl. Acad. Sci.
- npt confers resistance to the aminoglycosides, neomycin and G-418 (Colbere-Garapin et al., J. Mol. Biol. 150, 1-14, 1981), and als and at confer resistance to chlorsulfuron and phosphinotricin acetyltransferase, respectively (Murray, 1992, supra). Additional selectable genes have been described. For example, trpB allows cells to utilize indole in place of tryptophan, or hisD, which allows cells to utilize histinol in place of histidine (Hartman & Mulligan, Proc. Natl. Acad. Sci. 85, 8047-51, 1988).
- Visible markers such as anthocyanins, ⁇ -glucuronidase and its substrate GUS, and luciferase and its substrate luciferin, can be used to identify transformants and to quantify the amount of transient or stable protein expression attributable to a specific vector system (Rhodes et al, Methods Mol. Biol. 55, 121-131, 1995). Detecting Expression
- marker gene expression suggests that the phosphatidic acid- preferring phospholipase Al polynucleotide is also present, its presence and expression may need to be confirmed. For example, if a sequence encoding a phosphatidic acid-preferring phospholipase Al polypeptide is inserted within a marker gene sequence, transformed cells containing sequences that encode a phosphatidic acid-preferring phospholipase Al polypeptide can be identified by the absence of marker gene function. Alternatively, a marker gene can be placed in tandem with a sequence encoding a phosphatidic acid-preferring phospholipase Al polypeptide under the control of a single promoter. Expression of the marker gene in response to induction or selection usually indicates expression of the phosphatidic acid-preferring phospholipase Al polynucleotide.
- host cells which contain a phosphatidic acid-preferring phospholipase
- Al polynucleotide and which express a phosphatidic acid-preferring phospholipase Al polypeptide can be identified by a variety of procedures known to those of skill in the art. These procedures include, but are not limited to, DNA-DNA or DNA-RNA hybridizations and protein bioassay or immunoassay techniques that include mem- brane, solution, or chip-based technologies for the detection and/or quantification of nucleic acid or protein.
- the presence of a polynucleotide sequence encoding a phosphatidic acid-preferring phospholipase Al polypeptide can be detected by DNA-DNA or DNA-RNA hybridization or amplification using probes or fragments or fragments of polynucleotides encoding a phosphatidic acid-preferring phospholipase Al polypeptide.
- Nucleic acid amplification-based assays involve the use of oligonucleotides selected from sequences encoding a phosphatidic acid- preferring phospholipase Al polypeptide to detect transformants that contain a phosphatidic acid-preferring phospholipase Al polynucleotide.
- a variety of protocols for detecting and measuring the expression of a phosphatidic acid-preferring phospholipase Al polypeptide, using either polyclonal or monoclonal antibodies specific for the polypeptide, are known in the art. Examples include enzyme-linked immunosorbent assay (ELISA), radioimmunoassay (RIA), and fluorescence activated cell sorting (FACS).
- ELISA enzyme-linked immunosorbent assay
- RIA radioimmunoassay
- FACS fluorescence activated cell sorting
- a two-site, monoclonal-based immunoassay using monoclonal antibodies reactive to two non-interfering epitopes on a phos- phatidic acid-preferring phospholipase Al polypeptide can be used, or a competitive binding assay can be employed.
- Means for producing labeled hybridization or PCR probes for detecting sequences related to polynucleotides encoding phosphatidic acid-preferring phospholipase Al polypeptides include oligolabeling, nick translation, end-labeling, or PCR amplification using a labeled nucleotide.
- sequences encoding a phosphatidic acid- preferring phospholipase Al polypeptide can be cloned into a vector for the production of an rnRNA probe.
- RNA probes are known in the art, are commercially available, and can be used to synthesize RNA probes in vitro by addition of labeled nucleotides and an appropriate RNA polymerase such as T7, T3, or SP6. These procedures can be conducted using a variety of commercially available kits
- reporter molecules or labels which can be used for ease of detection include radionuclides, enzymes, and fluorescent, chemiluminescent, or chromogenic agents, as well as substrates, cofactors, inhibitors, magnetic particles, and the like.
- Host cells transformed with nucleotide sequences encoding a phosphatidic acid- preferring phospholipase Al polypeptide can be cultured under conditions suitable for the expression and recovery of the protein from cell culture.
- the polypeptide produced by a transformed cell can be secreted or contained intracellularly depending on the sequence and/or the vector used.
- expression vectors containing polynucleotides which encode phosphatidic acid- preferring phospholipase Al polypeptides can be designed to contain signal sequences which direct secretion of soluble phosphatidic acid-preferring phospho- lipase Al polypeptides through a prokaryotic or eukaryotic cell membrane or which direct the membrane insertion of membrane-bound phosphatidic acid-preferring phospholipase Al polypeptide.
- purification facilitating domains include, but are not limited to, metal chelating peptides such as histidine-tryptophan modules that allow purification on immobilized metals, protein A domains that allow purification on immobilized immunoglobulin, and the domain utilized in the FLAGS extension/affinity purification system
- cleavable linker sequences such as those specific for Factor Xa or enterokinase (Invitrogen, San Diego, CA) between the purification domain and the phosphatidic acid-preferring phospholipase Al polypeptide also can be used to facilitate purification.
- One such expression vector provides for expression of a fusion protein containing a phosphatidic acid-preferring phospholipase Al polypeptide and 6 histidine residues preceding a thioredoxin or an enterokinase cleavage site.
- the histidine residues facilitate purification by EVIAC (immobilized metal ion affinity chromatography, as described in Porath et al, Prot. Exp. Purif 3, 263-281, 1992), while the enterokinase cleavage site provides a means for purifying the phosphatidic acid-preferring phospholipase Al polypeptide from the fusion protein.
- Vectors that contain fusion proteins are disclosed in Kroll et al, DNA Cell Biol. 72, 441-453, 1993. Chemical Synthesis
- Sequences encoding a phosphatidic acid-preferring phospholipase Al polypeptide can be synthesized, in whole or in part, using chemical methods well known in the art (see Caruthers et al, Nucl Acids Res. Symp. Ser. 215-223, 4980; Horn et al. Nucl.
- a phosphatidic acid-preferring phospholipase Al polypeptide itself can be produced using chemical methods to synthesize its amino acid sequence, such as by direct peptide synthesis using solid-phase techniques (Merrifield, J. Am. Chem. Soc. 85, 2149-2154, 1963; Roberge et al, Science 269, 202-204, 1995). Protein synthesis can be performed using manual techniques or by automation. Automated synthesis can be achieved, for example, using Applied Biosystems 431 A Peptide Synthesizer (Perkin Elmer).
- fragments of phosphatidic acid-preferring phospholipase Al polypeptides can be separately synthesized and combined using chemical methods to produce a full-length molecule.
- the newly synthesized peptide can be substantially purified by preparative high performance liquid chromatography (e.g., Creighton, PROTEINS: STRUCTURES AND MOLECULAR PRINCIPLES, WH Freeman and Co., New York, N.Y., 1983).
- the composition of a synthetic phosphatidic acid-preferring phospholipase Al polypeptide can be confirmed by amino acid analysis or sequencing (e.g., the Edman degradation procedure; see Creighton, supra). Additionally, any portion of the amino acid sequence of the phosphatidic acid-preferring phospholipase Al polypeptide can be altered during direct synthesis and/or combined using chemical methods with sequences from other proteins to produce a variant polypeptide or a fusion protein.
- codons preferred by a particular prokaryotic or eukaryotic host can be selected to increase the rate of protein expression or to produce an RNA transcript having desirable properties, such as a half-life that is longer than that of a transcript generated from the naturally occurring sequence.
- nucleotide sequences disclosed herein can be engineered using methods generally known in the art to alter phosphatidic acid-preferring phospholipase Al polypeptide-encoding sequences for a variety of reasons, including but not limited to, alterations which modify the cloning, processing, and/or expression of the polypeptide or mRNA product.
- DNA shuffling by random fragmentation and PCR reassembly of gene fragments and synthetic oligonucleotides can be used to engineer the nucleotide sequences.
- site-directed mutagenesis can be used to insert new restriction sites, alter glycosylation patterns, change codon preference, produce splice variants, introduce mutations, and so forth.
- Antibody as used herein includes intact immunoglobulin molecules, as well as fragments thereof, such as Fab, F(ab') 2 , and Fv, which are capable of binding an epitope of a phosphatidic acid-preferring phospholipase Al polypeptide.
- Fab fragment antigen binding protein
- F(ab') 2 fragment antigen binding protein
- Fv fragment antigen binding protein
- An antibody which specifically binds to an epitope of a phosphatidic acid-preferring phospholipase Al polypeptide can be used therapeutically, as well as in immuno- chemical assays, such as Western blots, ELISAs, radioimmunoassays, immuno- histochemical assays, immunoprecipitations, or other immunochemical assays known in the art.
- immunoassays can be used to identify antibodies having the desired specificity. Numerous protocols for competitive binding or immuno- radiometric assays are well known in the art. Such immunoassays typically involve the measurement of complex formation between an immunogen and an antibody that specifically binds to the immunogen.
- an antibody which specifically binds to a phosphatidic acid-preferring phospholipase Al polypeptide provides a detection signal at least 5-, 10-, or 20-fold higher than a detection signal provided with other proteins when used in an immuno- chemical assay.
- antibodies which specifically bind to phosphatidic acid- preferring phospholipase Al polypeptides do not detect other proteins in immuno- chemical assays and can immunoprecipitate a phosphatidic acid-preferring phospholipase Al polypeptide from solution.
- Human phosphatidic acid-preferring phospholipase Al polypeptides can be used to immunize a mammal, such as a mouse, rat, rabbit, guinea pig, monkey, or human, to produce polyclonal antibodies.
- a phosphatidic acid-preferring phospholipase Al polypeptide can be conjugated to a carrier protein, such as bovine serum albumin, thyroglobulin, and keyhole limpet hemocyanin.
- a carrier protein such as bovine serum albumin, thyroglobulin, and keyhole limpet hemocyanin.
- various adjuvants can be used to increase the immunological response.
- adjuvants include, but are not limited to, Freund's adjuvant, mineral gels (e.g., aluminum hydroxide), and surface active substances (e.g.
- BCG Bacilli Calmette-Gueri ⁇
- Corynebacterium parvum are especially useful.
- Monoclonal antibodies that specifically bind to a phosphatidic acid-preferring phospholipase Al polypeptide can be prepared using any technique which provides for the production of antibody molecules by continuous cell lines in culture. These techniques include, but are not limited to, the hybridoma technique, the human B-cell hybridoma technique, and the EBV-hybridoma technique (Kohler et al, Nature 256,
- chimeric antibodies the splicing of mouse antibody genes to human antibody genes to obtain a molecule with appropriate antigen specificity and biological activity, can be used (Morrison et al, Proc. Natl. Acad. Sci. 81, 6851-6855, 1984; Neuberger et al, Nature 312, 604-608, 1984; Takeda et al, Nature 314, 452-454, 1985).
- Monoclonal and other antibodies also can be "humanized” to prevent a patient from mounting an immune response against the antibody when it is used therapeutically. Such antibodies may be sufficiently similar in sequence to human antibodies to be used directly in therapy or may require alteration of a few key residues.
- rodent antibodies and human sequences can be minimized by replacing residues which differ from those in the human sequences by site directed mutagenesis of individual residues or by grating of entire complementarity determining regions.
- humanized antibodies can be produced using recombinant methods, as described in GB2188638B.
- Antibodies that specifically bind to a phosphatidic acid-preferring phospholipase Al polypeptide can contain antigen binding sites which are either partially or fully humanized, as disclosed in U.S. 5,565,332.
- single chain antibodies can be adapted using methods known in the art to produce single chain antibodies that specifically bind to phosphatidic acid-preferring phospholipase Al polypeptides.
- Antibodies with related specificity, but of distinct idiotypic composition, can be generated by chain shuffling from random combinatorial immunoglobin libraries
- Single-chain antibodies also can be constructed using a DNA amplification method, such as PCR, using hybridoma cDNA as a template (Thirion et al, 1996, Eur. J. Cancer Prev. 5, 507-11).
- Single-chain antibodies can be mono- or bispecific, and can be bivalent or tetravalent. Construction of tetravalent, bispecific single-chain antibodies is taught, for example, in Coloma & Morrison, 1997, Nat. Biotechnol 15, 159-63. Construction of bivalent, bispecific single-chain antibodies is taught in Mallender & Voss, 1994, J. Biol. Chem. 269, 199-206.
- a nucleotide sequence encoding a single-chain antibody can be constructed using manual or automated nucleotide synthesis, cloned into an expression construct using standard recombinant D ⁇ A methods, and introduced into a cell to express the coding sequence, as described below.
- single-chain antibodies can be produced directly using, for example, filamentous phage technology (Verhaar et al, 1995, Int. J. Cancer 61, 497-501; ⁇ icholls et al, 1993, J. Immunol. Meth. 165, 81-91).
- Antibodies which specifically bind to phosphatidic acid-preferring phospholipase Al polypeptides also can be produced by inducing in vivo production in the lymphocyte population or by screening immunoglobulin libraries or panels of highly specific binding reagents as disclosed in the literature (Orlandi et al, Proc. Natl. Acad. Sci.
- chimeric antibodies can be constructed as disclosed in WO 93/03151.
- Binding proteins which are derived from immunoglobulins and which are multivalent and multispecific, such as the "diabodies" described in WO 94/13804, also can be prepared.
- Antibodies according to the invention can be purified by methods well known in the art. For example, antibodies can be affinity purified by passage over a column to which a phosphatidic acid-preferring phospholipase Al polypeptide is bound. The bound antibodies can then be eluted from the column using a buffer with a high salt concentration.
- Antisense Oligonucleotides can be affinity purified by passage over a column to which a phosphatidic acid-preferring phospholipase Al polypeptide is bound. The bound antibodies can then be eluted from the column using a buffer with a high salt concentration.
- Antisense oligonucleotides are nucleotide sequences that are complementary to a specific DNA or RNA sequence. Once introduced into a cell, the complementary nucleotides combine with natural sequences produced by the- cell to form complexes and block either transcription or translation.
- an antisense oligonucleotide is at least 11 nucleotides in length, but can be at least 12, 15, 20, 25, 30, 35, 40, 45, or 50 or more nucleotides long. Longer sequences also can be used.
- Antisense oligonucleotide molecules can be provided in a DNA construct and introduced into a cell as described above to decrease the level of phosphatidic acid-preferring phospholipase Al gene products in the cell.
- Antisense oligonucleotides can be deoxyribonucleotides, ribonucleotides, or a combination of both. Oligonucleotides can be synthesized manually or by an automated synthesizer, by covalently linking the 5' end of one nucleotide with the 3' end of another nucleotide with non-phosphodiester internucleotide linkages such alkylphosphonates, phosphorothioates, phosphorodithioates, alkylphosphonothioates, alkylphosphonates, phosphoramidates, phosphate esters, carbamates, acetamidate, carboxymethyl esters, carbonates, and phosphate triesters. See Brown, Meth. Mol. Biol. 20, 1-8, 1994; Sonveaux, Meth. Mol. Biol. 26, 1-72, 1994; Uhlmann et al,
- Modifications of phosphatidic acid-preferring phospholipase Al gene expression can be obtained by designing antisense oligonucleotides that will form duplexes to the control, 5', or regulatory regions of the phosphatidic acid-preferring phospholipase
- Oligonucleotides derived from the transcription initiation site e.g., between positions -10 and +10 from the start site, are prefe ⁇ ed.
- inhibition can be achieved using "triple helix" base-pairing methodology. Triple helix pairing is useful because it causes inhibition of the ability of the double helix to open sufficiently for the binding of polymerases, transcription factors, or chaperons.
- An antisense oligonucleotide also can be designed to block translation of mRNA by preventing the transcript from binding to ribosomes.
- Antisense oligonucleotides which comprise, for example, 2, 3, 4, or 5 or more stretches of contiguous nucleotides which are precisely complementary to a phosphatidic acid-preferring phospholipase Al polynucleotide, each separated by a stretch of contiguous nucleotides which are not complementary to adjacent phosphatidic acid-preferring phospholipase Al nucleotides, can provide sufficient targeting specificity for phosphatidic acid-preferring phospholipase Al mRNA.
- each stretch of complementary contiguous nucleotides is at least 4, 5, 6, 7, or 8 or more nucleotides in length.
- Non- complementary intervening sequences are preferably 1, 2, 3, or 4 nucleotides in length.
- One skilled in the art can easily use the calculated melting point of an antisense-sense pair to determine the degree of mismatching which will be tolerated between a particular antisense oligonucleotide and a particular phosphatidic acid- preferring phospholipase Al polynucleotide sequence.
- Antisense oligonucleotides can be modified without affecting their ability to hybridize to a phosphatidic acid-preferring phospholipase Al polynucleotide. These modifications can be internal or at one or both ends of the antisense molecule.
- internucleoside phosphate linkages can be modified by adding cholesteryl or diamine moieties with varying numbers of carbon residues between the amino groups and terminal ribose.
- Modified bases and/or sugars such as arabinose instead of ribose, or a 3', 5 '-substituted oligonucleotide in which the 3' hydroxyl group or the 5' phosphate group are substituted, also can be employed in a modified antisense oligonucleotide.
- modified oligonucleotides can be prepared by methods well known in the art. See, e.g., Agrawal et al, Trends Biotechnol 10, 152-158, 1992; Uhlmann et al, Chem. Rev. 90, 543-584, 1990; Uhlmann et al, Tetrahedron. Lett. 215, 3539-3542, 1987.
- Ribozymes are RNA molecules with catalytic activity. See, e.g., Cech, Science 236, 1532-1539; 1987; Cech, Ann. Rev. Biochem. 59, 543-568; 1990, Cech, Curr. Opin. Struct. Biol. 2, 605-609; 1992, Couture & Stinchcomb, Trends Genet. 12, 510-515, 1996. Ribozymes can be used to inhibit gene function by cleaving an RNA sequence, as is known in the art (e.g., Haseloff et al, U.S. Patent 5,641,673).
- ribozyme action involves sequence-specific hybridization of the ribozyme molecule to complementary target RNA, followed by endonucleolytic cleavage.
- Examples include engineered hammerhead motif ribozyme molecules that can specifically and efficiently catalyze endonucleolytic cleavage of specific nucleotide sequences.
- the coding sequence of a phosphatidic acid-preferring phospholipase Al polynucleotide can be used to generate ribozymes that will specifically bind to mRNA transcribed from the phosphatidic acid-preferring phospholipase Al polynucleotide.
- Methods of designing and constructing ribozymes which can cleave other RNA molecules in trans in a highly sequence specific manner have been developed and described in the art (see Haseloff et al. Nature 334, 585-591, 1988).
- the cleavage activity of ribozymes can be targeted to specific RNAs by engineering a discrete "hybridization" region into the ribozyme.
- the hybridization region contains a sequence complementary to the target RNA and thus specifically hybridizes with the target (see, for example, Gerlach et al, EP 321,201).
- Al RNA target can be identified by scanning the target molecule for ribozyme cleavage sites which include the following sequences: GUA, GUU, and GUC. Once identified, short RNA sequences of between 15 and 20 ribonucleotides corresponding to the region of the target RNA containing the cleavage site can be evaluated for secondary structural features which may render the target inoperable. Suitability of candidate phosphatidic acid-preferring phospholipase Al RNA targets also can be evaluated by testing accessibility to hybridization with complementary oligonucleo- tides using ribonuclease protection assays. Longer complementary sequences can be used to increase the affinity of the hybridization sequence for the target. The hybridizing and cleavage regions of the ribozyme can be integrally related such that upon hybridizing to the target RNA through the complementary regions, the catalytic region of the ribozyme can cleave the target.
- Ribozymes can be introduced into cells as part of a DNA construct. Mechanical methods, such as microinjection, liposome-mediated transfection, electroporation, or calcium phosphate precipitation, can be used to introduce a ribozyme-containing DNA construct into cells in which it is desired to decrease phosphatidic acid- preferring phospholipase Al expression. Alternatively, if it is desired that the cells stably retain the DNA construct, the construct can be supplied on a plasmid and maintained as a separate element or integrated into the genome of the cells, as is known in the art.
- a ribozyme-encoding DNA construct can include transcriptional regulatory elements, such as a promoter element, an enhancer or UAS element, and a transcriptional terminator signal, for controlling transcription of ribozymes in the cells.
- ribozymes can be engineered so that ribozyme expression will occur in response to factors that induce expression of a target gene. Ribozymes also can be engineered to provide an additional level of regulation, so that destruction of mRNA occurs only when both a ribozyme and a target gene are induced in the cells. Differentially Expressed Genes
- genes whose products interact with human phosphatidic acid-preferring phospholipase Al may represent genes that are differentially expressed in disorders including, but not limited to, CNS disorders, genitourinary disorders, cardiovascular disorders, and hematological disorders. Further, such genes may represent genes that are differentially regulated in response to manipulations relevant to the progression or treatment of such diseases. Additionally, such genes may have a temporally modulated expression, increased or decreased at different stages of tissue or organism development. A differentially expressed gene may also have its expression modulated under control versus experimental conditions. In addition, the human phosphatidic acid- preferring phospholipase Al gene or gene product may itself be tested for differential expression.
- the degree to which expression differs in a normal versus a diseased state need only be large enough to be visualized via standard characterization techniques such as differential display techniques.
- standard characterization techniques such as differential display techniques.
- Other such standard characterization techniques by which expression differences may be visualized include but are not limited to, quantitative RT (reverse transcriptase), PCR, and Northern analysis.
- RNA samples are obtained from tissues of experimental subjects and from corresponding tissues of control subjects. Any RNA isolation technique that does not select against the isolation of mRNA may be utilized for the purification of such RNA samples. See, for example, Ausubel et al, ed., CURRENT PROTOCOLS IN MOLECULAR BIOLOGY, John Wiley & Sons, Inc. New York, 1987-1993. Large numbers of tissue samples may readily be processed using techniques well known to those of skill in the art, such as, for example, the single-step RNA isolation process of Chomczynski, U.S. Patent 4,843,155.
- Transcripts within the collected RNA samples that represent RNA produced by differentially expressed genes are identified by methods well known to those of skill in the art. They include, for example, differential screening (Tedder et al, Proc. Natl. Acad. Sci. U.S.A. 85, 208-12, 1988), subtractive hybridization (Hedrick et al, Nature 308, 149-53; Lee et al, Proc. Natl. Acad. Sci. U.S.A. 88, 2825, 1984), and, preferably, differential display (Liang & Pardee, Science 257, 967-71, 1992; U.S. Patent 5,262,311).
- the differential expression information may itself suggest relevant methods for the treatment of disorders involving the human phosphatidic acid-preferring phospholipase Al.
- treatment may include a modulation of expression of the differentially expressed genes and/or the gene encoding the human phosphatidic acid- preferring phospholipase Al.
- the differential expression information may indicate whether the expression or activity of the differentially expressed gene or gene product or the human phosphatidic acid-preferring phospholipase Al gene or gene product are up-regulated or down-regulated.
- the invention provides assays for screening test compounds that bind to or modulate the activity of a phosphatidic acid-preferring phospholipase Al polypeptide or a phosphatidic acid-preferring phospholipase Al polynucleotide.
- a test compound preferably binds to a phosphatidic acid-preferring phospholipase Al polypeptide or polynucleotide. More preferably, a test compound decreases or increases phospholipase Al activity by at least about 10, preferably about 50, more preferably about 75, 90, or 100% relative to the absence of the test compound.
- Test compounds can be pharmacologic agents already known in the art or can be compounds previously unknown to have any pharmacological activity.
- the com- pounds can be naturally occurring or designed in the laboratory. They can be isolated from microorganisms, animals, or plants, and can be produced recombinantly, or synthesized by chemical methods known in the art. If desired, test compounds can be obtained using any of the numerous combinatorial library methods known in the art, including but not limited to, biological libraries, spatially addressable parallel solid phase or solution phase libraries, synthetic library methods requiring deconvolution, the "one-bead one-compound” library method, and synthetic library methods using affinity chromatography selection.
- the biological library approach is limited to polypeptide libraries, while the other four approaches are applicable to polypeptide, non-peptide oligomer, or small molecule libraries of compounds. See Lam, Anticancer Drug Des. 12, 145, 1997.
- Test compounds can be screened for the ability to bind to phosphatidic acid- preferring phospholipase Al polypeptides or polynucleotides or to affect phospha- tidic acid-preferring phospholipase Al activity or phosphatidic acid-preferring phospholipase Al gene expression using high throughput screening.
- high throughput screening many discrete compounds can be tested in parallel so that large numbers of test compounds can be quickly screened.
- the most widely established techniques utilize 96-well microtiter plates. The wells of the microtiter plates typically require assay volumes that range from 50 to 500 ⁇ l.
- many instruments, materials, pipettors, robotics, plate washers, and plate readers are commercially available to fit the 96-well format.
- free format assays or assays that have no physical barrier between samples, can be used.
- an assay using pigment cells (melanocytes) in a simple homogeneous assay for combinatorial peptide libraries is described by Jayawickreme et al, Proc. Natl. Acad. Sci. U.S.A. 19, 1614-18 (1994).
- the cells are placed under agarose in petri dishes, then beads that carry combinatorial compounds are placed on the surface of the agarose.
- the combinatorial compounds are partially released the compounds from the beads. Active compounds can be visualized as dark pigment areas because, as the compounds diffuse locally into the gel matrix, the active compounds cause the cells to change colors.
- Chelsky "Strategies for Screening Combinatorial Libraries: Novel and Traditional Approaches," reported at the First Annual Conference of The Society for Biomolecular Screening in Philadelphia, Pa. (Nov. 7-10, 1995).
- Chelsky placed a simple homogenous enzyme assay for carbonic anhydrase inside an agarose gel such that the enzyme in the gel would cause a color change throughout the gel.
- beads carrying combina- torial compounds via a photolinker were placed inside the gel and the compounds were partially released by UV-light. Compounds that inhibited the enzyme were observed as local zones of inhibition having less color change.
- test samples are placed in a porous matrix.
- One or more assay components are then placed within, on top of, or at the bottom of a matrix such as a gel, a plastic sheet, a filter, or other form of easily manipulated solid support.
- a matrix such as a gel, a plastic sheet, a filter, or other form of easily manipulated solid support.
- the test compound is preferably a small molecule that binds to and occupies, for example, the active site of the phosphatidic acid-preferring phospholipase Al polypeptide, such that normal biological activity is prevented.
- small molecules include, but are not limited to, small peptides or peptide-like molecules.
- either the test compound or the phosphatidic acid-preferring phospholipase Al polypeptide can comprise a detectable label, such as a fluorescent, radioisotopic, chemiluminescent, or enzymatic label, such as horseradish peroxidase, alkaline phosphatase, or luciferase.
- a detectable label such as a fluorescent, radioisotopic, chemiluminescent, or enzymatic label, such as horseradish peroxidase, alkaline phosphatase, or luciferase.
- Detection of a test compound that is bound to the phosphatidic acid-preferring phospholipase Al polypeptide can then be accomplished, for example, by direct counting of radioemmission, by scintillation counting, or by determining conversion of an appropriate substrate to a detectable product.
- binding of a test compound to a phosphatidic acid-preferring phospholipase Al polypeptide can be determined without labeling either of the interactants.
- a microphysiometer can be used to detect binding of a test compound with a phosphatidic acid-preferring phospholipase Al polypeptide.
- a microphysio- meter e.g., CytosensorTM
- a microphysio- meter is an analytical instrument that measures the rate at which a cell acidifies its environment using a light-addressable potentiometric sensor (LAPS). Changes in this acidification rate can be used as an indicator of the interaction between a test compound and a phosphatidic acid-preferring phospholipase Al polypeptide (McConnell et al, Science 257, 1906-1912, 1992).
- BIA Bimolecular interaction Analysis
- Al polypeptide can be used as a "bait protein" in a two-hybrid assay or three-hybrid assay (see, e.g., U.S. Patent 5,283,317; Zervos et al, Cell 72, 223-232, 1993; Madura et al, J. Biol. Chem. 268, 12046-12054, 1993; Bartel et al, BioTechniques 14, 920-924, 1993; Iwabuchi et al, Oncogene 8, 1693-1696, 1993; and Brent W0 94/10300), to identify other proteins which bind to or interact with the phosphatidic acid-preferring phospholipase Al polypeptide and modulate its activity.
- a two-hybrid assay see, e.g., U.S. Patent 5,283,317; Zervos et al, Cell 72, 223-232, 1993; Madura et al, J. Biol. Chem. 268, 12046-120
- the two-hybrid system is based on the modular nature of most transcription factors, which consist of separable DNA-binding and activation domains.
- the assay utilizes two different DNA constructs.
- polynucleotide encoding a phosphatidic acid-preferring phospholipase Al polypeptide can be fused to a polynucleotide encoding the DNA binding domain of a known transcription factor (e.g., GAL-4).
- a DNA sequence that encodes an unidentified protein (“prey” or "sample” can be fused to a polynucleotide that codes for the activation domain of the known transcription factor. If the "bait" and the "prey” proteins are able to interact in vivo to form an proteinrdependent complex, the
- DNA-binding and activation domains of the transcription factor are brought into close proximity. This proximity allows transcription of a reporter gene (e.g., LacZ), which is operably linked to a transcriptional regulatory site responsive to the transcription factor. Expression of the reporter gene can be detected, and cell colonies containing the functional transcription factor can be isolated and used to obtain the reporter gene.
- a reporter gene e.g., LacZ
- DNA sequence encoding the protein that interacts with the phosphatidic acid- preferring phospholipase Al polypeptide is provided.
- either the phosphatidic acid-preferring phospho- lipase Al polypeptide (or polynucleotide) or the test compound may be desirable to immobilize either the phosphatidic acid-preferring phospho- lipase Al polypeptide (or polynucleotide) or the test compound to facilitate separation of bound from unbound forms of one or both of the interactants, as well as to accommodate automation of the assay.
- either the phosphatidic acid- preferring phospholipase Al polypeptide (or polynucleotide) or the test compound can be bound to a solid support.
- Suitable solid supports include, but are not limited to, glass or plastic slides, tissue culture plates, microtiter wells, tubes, silicon chips, or particles such as beads (including, but not limited to, latex, polystyrene, or glass beads).
- Any method known in the art can be used to attach the enzyme polypeptide (or polynucleotide) or test compound to a solid support, including use of covalent and non-covalent linkages, passive absorption, or pairs of binding moieties attached respectively to the polypeptide (or polynucleotide) or test compound and the solid support.
- Test compounds are preferably bound to the solid support in an array, so that the location of individual test compounds can be tracked. Binding of a test compound to a phosphatidic acid-preferring phospholipase Al polypeptide (or polynucleotide) can be accomplished in any vessel suitable for containing the reactants. Examples of such vessels include microtiter plates, test tubes, and microcentrifuge tubes.
- the phosphatidic acid-preferring phospholipase Al polypeptide is a fusion protein comprising a domain that allows the phosphatidic acid-preferring phospholipase Al polypeptide to be bound to a solid support.
- glutathione-S-transferase fusion proteins can be adsorbed onto glutathione sepharose beads (Sigma Chemical, St. Louis, Mo.) or glutathione derivatized microtiter plates, which are then combined with the test compound or the test compound and the non-adsorbed phosphatidic acid-preferring phospholipase Al polypeptide; the mixture is then incubated under conditions conducive to complex formation (e.g., at physiological conditions for salt and pH).
- Binding of the interactants can be determined either directly or indirectly, as described above. Alternatively, the complexes can be dissociated from the solid support before binding is determined.
- a phosphatidic acid-preferring phospholipase Al polypeptide (or polynucleotide) or a test compound can be immobilized utilizing conjugation of biotin and streptavidin.
- Bio- tinylated phosphatidic acid-preferring phospholipase Al polypeptides (or polynucleotides) or test compounds can be prepared from biotin-NHS(N-hydroxy- succinimide) using techniques well known in the art (e.g., biotinylation kit, Pierce Chemicals, Rockford, 111.) and immobilized in the wells of streptavidin-coated 96 well plates (Pierce Chemical).
- antibodies which specifically bind to a phosphatidic acid-preferring phospholipase Al polypeptide, polynucleotide, or a test compound, but which do not interfere with a desired binding site, such as the active site of the phosphatidic acid-preferring phospholipase Al polypeptide, can be derivatized to the wells of the plate. Unbound target or protein can be trapped in the wells by antibody conjugation.
- Methods for detecting such complexes include immunodetection of complexes using antibodies which specifically bind to the phosphatidic acid-preferring phospholipase Al polypeptide or test compound, enzyme-linked assays which rely on detecting an activity of the phosphatidic acid-preferring phospholipase Al polypeptide, and SDS gel electrophoresis under non-reducing conditions.
- Screening for test compounds which bind to a phosphatidic acid-preferring phospholipase Al polypeptide or polynucleotide also can be carried out in an intact cell. Any cell which comprises a phosphatidic acid-preferring phospholipase Al polypeptide or polynucleotide can be used in a cell-based assay system. A phosphatidic acid- preferring phospholipase Al polynucleotide can be naturally occurring in the cell or can be introduced using techniques such as those described above. Binding of the test compound to a phosphatidic acid-preferring phospholipase Al polypeptide or polynucleotide is determined as described above.
- Test compounds can be tested for the ability to increase or decrease the activity of a human phosphatidic acid-preferring phospholipase Al polypeptide.
- Al activity can be measured, for example, as described in U.S. Patent 5,538,874.
- Enzyme assays can be carried out after contacting either a purified phosphatidic acid- preferring phospholipase Al polypeptide, a cell membrane preparation, or an intact cell with a test compound.
- a test compound that decreases a phospholipase Al activity of a phosphatidic acid-preferring phospholipase Al polypeptide by at least about 10, preferably about 50, more preferably about 75, 90, or 100% is identified as a potential therapeutic agent for decreasing phosphatidic acid-preferring phospholipase Al activity.
- a test compound which increases a phospholipase Al activity of a human phosphatidic acid-preferring phospholipase Al polypeptide by at least about 10, preferably about 50, more preferably about 75, 90, or 100% is identified as a potential therapeutic agent for increasing human phosphatidic acid-preferring phospholipase Al activity.
- test compounds that increase or decrease phosphatidic acid- preferring phospholipase Al gene expression are identified.
- a phosphatidic acid- preferring phospholipase Al polynucleotide is contacted with a test compound, and the expression of an RNA or polypeptide product of the phosphatidic acid-preferring phospholipase Al polynucleotide is determined.
- the level of expression of appropriate mRNA or polypeptide in the presence of the test compound is compared to the level of expression of mRNA or polypeptide in the absence of the test compound.
- the test compound can then be identified as a modulator of expression based on this comparison.
- test compound when expression of mRNA or polypeptide is greater in the presence of the test compound than in its absence, the test compound is identified as a stimulator or enhancer of the mRNA or polypeptide expression.
- test compound when expression of the mRNA or polypeptide is less in the presence of the test compound than in its absence, the test compound is identified as an inhibitor of the mRNA or polypeptide expression.
- the level of phosphatidic acid-preferring phospholipase Al mRNA or polypeptide expression in the cells can be determined by methods well known in the art for detecting mRNA or polypeptide. Either qualitative or quantitative methods can be used.
- the presence of polypeptide products of a phosphatidic acid-preferring phospholipase Al polynucleotide can be determined, for example, using a variety of techniques known in the art, including immunochemical methods such as radio- immunoassay, Western blotting, and immunohistochemistry.
- polypeptide synthesis can be determined in vivo, in a cell culture, or in an in vitro translation system by detecting incorporation of labeled amino acids into a phosphatidic acid-preferring phospholipase Al polypeptide.
- screening can be carried out either in a cell-free assay system or in an intact cell.
- Any cell that expresses a phosphatidic acid-preferring phospholipase Al polynucleotide can be used in a cell-based assay system.
- the phosphatidic acid- preferring phospholipase Al polynucleotide can be naturally occurring in the cell or can be introduced using techniques such as those described above. Either a primary culture or an established cell line, such as CHO or human embryonic kidney 293 cells, can be used.
- compositions of the invention can comprise, for example, a phosphatidic acid-preferring phospholipase Al polypeptide, phosphatidic acid-preferring phospholipase Al polynucleotide, ribozymes or antisense oligonucleotides, antibodies which specifically bind to a phosphatidic acid-preferring phospholipase Al polypeptide, or mimetics, activators, or inhibitors of a phosphatidic acid-preferring phospholipase Al polypeptide activity.
- compositions can be administered alone or in combination with at least one other agent, such as stabilizing compound, which can be administered in any sterile, biocompatible pharmaceutical carrier, including, but not limited to, saline, buffered saline, dextrose, and water.
- agent such as stabilizing compound
- the compositions can be administered to a patient alone, or in combination with other agents, drugs or hormones.
- compositions of the invention can be administered by any number of routes including, but not limited to, oral, intravenous, intramuscular, intra-arterial, intramedullary, intrathecal, intraventricular, transdermal, subcutaneous, intraperitoneal, intranasal, parenteral, topical, sublingual, or rectal means.
- Pharmaceutical compositions for oral administration can be formulated using pharmaceutically acceptable carriers well known in the art in dosages suitable for oral administration. Such carriers enable the pharmaceutical compositions to be formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions, and the like, for ingestion by the patient.
- compositions for oral use can be obtained through combination of active compounds with solid excipient, optionally grinding a resulting mixture, and processing the mixture of granules, after adding suitable auxiliaries, if desired, to obtain tablets or dragee cores.
- Suitable excipients are carbohydrate or protein fillers, such as sugars, including lactose, sucrose, mannitol, or sorbitol; starch from corn, wheat, rice, potato, or other plants; cellulose, such as methyl cellulose, hydroxypropylmethyl-cellulose, or sodium carboxymethylcellulose; gums including arabic and tragacanth; and proteins such as gelatin and collagen.
- disintegrating or solubilizing agents can be added, such as the cross-linked polyvinyl pyrrolidone, agar, alginic acid, or a salt thereof, such as sodium alginate.
- Dragee cores can be used in conjunction with suitable coatings, such as concentrated sugar solutions, which also can contain gum arabic, talc, polyvinylpyrrolidone, carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures.
- suitable coatings such as concentrated sugar solutions, which also can contain gum arabic, talc, polyvinylpyrrolidone, carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures.
- Dyestuffs or pigments can be added to the tablets or dragee coatings for product identification or to characterize the quantity of active compound, i.e., dosage.
- compositions that can be used orally include push-fit capsules made of gelatin, as well as soft, sealed capsules made of gelatin and a coating, such as glycerol or sorbitol.
- Push-fit capsules can contain active ingredients mixed with a filler or binders, such as lactose or starches, lubricants, such as talc or magnesium stearate, and, optionally, stabilizers.
- the active compounds can be dissolved or suspended in suitable liquids, such as fatty oils, liquid, or liquid polyethylene glycol with or without stabilizers.
- compositions suitable for parenteral administration can be formulated in aqueous solutions, preferably in physiologically compatible buffers such as Hanks' solution, Ringer's solution, or physiologically buffered saline.
- Aqueous injection suspensions can contain substances that increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, or dextran.
- suspensions of the active compounds can be prepared as appropriate oily injection suspensions.
- Suitable lipophilic solvents or vehicles include fatty oils such as sesame oil, or synthetic fatty acid esters, such as ethyl oleate or triglycerides, or liposomes.
- Non- lipid polycationic amino polymers also can be used for delivery.
- the suspension also can contain suitable stabilizers or agents that increase the solubility of the compounds to allow for the preparation of highly concentrated solutions.
- penetrants appropriate to the particular barrier to be permeated are used in the formulation. Such penetrants are generally known in the art.
- compositions of the present invention can be manufactured in a manner that is known in the art, e.g. , by means of conventional mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping, or lyophilizing processes.
- the pharmaceutical composition can be provided as a salt and can be formed with many acids, including but not limited to, hydrochloric, sulfuric, acetic, lactic, tartaric, malic, succinic, etc. Salts tend to be more soluble in aqueous or other protonic solvents than are the corresponding free base forms.
- the preferred preparation can be a lyophilized powder which can contain any or all of the following: 1-50 mM histidine, 0.1%-2% sucrose, and 2-7% mannitol, at a pH range of 4.5 to 5.5, that is combined with buffer prior to use.
- compositions can be placed in an appropriate container and labeled for treatment of an indicated condition.
- labeling would include amount, frequency, and method of administration.
- Human phosphatidic acid-preferring phospholipase Al can be regulated to treat CNS disorders, genitourinary disorders, cardiovascular disorders, and hematological disorders.
- Central and peripheral nervous system disorders also can be treated, such as primary and secondary disorders after brain injury, disorders of mood, anxiety disorders, disorders of thought and volition, disorders of sleep and wakefulness, diseases of the motor unit, such as neurogenic and myopathic disorders, neurodegenerative disorders such as Alzheimer's and Parkinson's disease, and processes of peripheral and chronic pain.
- Pain that is associated with CNS disorders also can be treated by regulating the activity of human phosphatidic acid-preferring phospholipase Al. Pain which can be treated includes that associated with central nervous system disorders, such as multiple sclerosis, spinal cord injury, sciatica, failed back surgery syndrome, traumatic brain injury, epilepsy, Parkinson's disease, post-stroke, and vascular lesions in the brain and spinal cord (e.g., infarct, hemorrhage, vascular mal- formation).
- central nervous system disorders such as multiple sclerosis, spinal cord injury, sciatica, failed back surgery syndrome, traumatic brain injury, epilepsy, Parkinson's disease, post-stroke, and vascular lesions in the brain and spinal cord (e.g., infarct, hemorrhage, vascular mal- formation).
- Non-central neuropathic pain includes that associated with post mastectomy pain, reflex sympathetic dystrophy (RSD), trigeminal neuralgiaradioculopathy, post-surgical pain, HIV/ AIDS related pain, cancer pain, metabolic neuropathies (e.g., diabetic neuropathy, vasculitic neuropathy secondary to connective tissue disease), paraneoplastic polyneuropathy associated, for example, with carcinoma of lung, or leukemia, or lymphoma, or carcinoma of prostate, colon or stomach, trigeminal neuralgia, cranial neuralgias, and post-herpetic neuralgia. Pain associated with cancer and cancer treatment also can be treated, as can headache pain (for example, migraine with aura, migraine without aura, and other migraine disorders), episodic and chronic tension-type headache, tension-type like headache, cluster headache, and chronic paroxysmal hemicrania.
- headache pain for example, migraine with aura, migraine without aura, and other migraine disorders
- episodic and chronic tension-type headache tension-type like headache, cluster headache, and chronic
- Cardiovascular diseases include the following disorders of the heart and the vascular system: congestive heart failure, myocardial infarction, ischemic diseases of the heart, all kinds of atrial and ventricular a ⁇ hythmias, hypertensive vascular diseases, and peripheral vascular diseases.
- Heart failure is defined as a pathophysiologic state in which an abnormality of cardiac function is responsible for the failure of the heart to pump blood at a rate commensurate with the requirement of the metabolizing tissue. It includes all forms of pumping failure, such as high-output and low-output, acute and chronic, right-sided or left-sided, systolic or diastolic, independent of the underlying cause.
- MI Myocardial infarction
- Ischemic diseases are conditions in which the coronary flow is restricted resulting in a perfusion which is inadequate to meet the myocardial requirement for oxygen.
- This group of diseases includes stable angina, unstable angina, and asymptomatic ischemia.
- a ⁇ hythmias include all forms of atrial and ventricular tachya ⁇ hythmias (atrial tachycardia, atrial flutter, atrial fibrillation, atrio-ventricular reentrant tachycardia, preexcitation syndrome, ventricular tachycardia, ventricular flutter, and ventricular fibrillation), as well as bradycardic forms of arrhythmias.
- vascular diseases include primary as well as all kinds of secondary arterial hyper- tension (renal, endocrine, neurogenic, others).
- the disclosed gene and its product may be used as drug targets for the treatment of hypertension as well as for the prevention of all complications.
- Peripheral vascular diseases are defined as vascular diseases in which arterial and/or venous flow is reduced resulting in an imbalance between blood supply and tissue oxygen demand. It includes chronic peripheral arterial occlusive disease (PAOD), acute arterial thrombosis and embolism, inflammatory vascular disorders, Raynaud's phenomenon, and venous disorders.
- PAOD peripheral arterial occlusive disease
- acute arterial thrombosis and embolism inflammatory vascular disorders
- Raynaud's phenomenon Raynaud's phenomenon
- venous disorders venous disorders.
- This invention further pertains to the use of novel agents identified by the screening assays described above. Accordingly, it is within the scope of this invention to use a test compound identified as described herein in an appropriate animal model.
- an agent identified as described herein e.g., a modulating agent, an antisense nucleic acid molecule, a specific antibody, ribozyme, or a phosphatidic acid-preferring phospholipase Al polypeptide binding molecule
- an agent identified as described herein can be used in an animal model to determine the mechanism of action of such an agent.
- this invention pertains to uses of novel agents identified by the above- described screening assays for treatments as described herein.
- a reagent which affects phosphatidic acid-preferring phospholipase Al activity can be administered to a human cell, either in vitro or in vivo, to reduce phosphatidic acid-preferring phospholipase Al activity.
- the reagent preferably binds to an expression product of a human phosphatidic acid-preferring phospholipase Al gene. If the expression product is a protein, the reagent is preferably an antibody.
- an antibody can be added to a preparation of stem cells that have been removed from the body. The cells can then be replaced in the same or another human body, with or without clonal propagation, as is known in the art.
- the reagent is delivered using a liposome.
- the liposome is stable in the animal into which it has been administered for at least about
- a liposome comprises a lipid composition that is capable of targeting a reagent, particularly a polynucleotide, to a particular site in an animal, such as a human.
- the lipid composition of the liposome is capable of targeting to a specific organ of an animal, such as the lung, liver, spleen, heart brain, lymph nodes, and skin.
- a liposome useful in the present invention comprises a lipid composition that is capable of fusing with the plasma membrane of the targeted cell to deliver its contents to the cell.
- the transfection efficiency of a liposome is about
- a liposome is between about 100 and 500 nm, more preferably between about 150 and 450 nm, and even more preferably between about 200 and 400 nm in diameter.
- Suitable liposomes for use in the present invention include those liposomes standardly used in, for example, gene delivery methods known to those of skill in the art. More prefe ⁇ ed liposomes include liposomes having a polycationic lipid composition and/or liposomes having a cholesterol backbone conjugated to polyethylene glycol.
- a liposome comprises a compound capable of targeting the liposome to a particular cell type, such as a cell-specific ligand exposed on the outer surface of the liposome.
- Complexing a liposome with a reagent such as an antisense oligonucleotide or ribozyme can be achieved using methods that are standard in the art (see, for example, U.S. Patent 5,705,151).
- polynucleotide is combined with about 8 nmol of liposomes, more preferably from about 0.5 ⁇ g to about 5 ⁇ g of polynucleotides are combined with about 8 nmol liposomes, and even more preferably about 1.0 ⁇ g of polynucleotides is combined with about 8 nmol liposomes.
- antibodies can be delivered to specific tissues in vivo using receptor-mediated targeted delivery.
- Receptor-mediated DNA delivery techniques are taught in, for example, Findeis et al. Trends in Biotechnol 11, 202-05 (1993);
- a therapeutically effective dose refers to that amount of active ingredient which increases or decreases phosphatidic acid-preferring phospholipase Al activity relative to the phosphatidic acid-preferring phospholipase Al activity which occurs in the absence of the therapeutically effective dose.
- the therapeutically effective dose can be estimated initially either in cell culture assays or in animal models, usually mice, rabbits, dogs, or pigs.
- the animal model also can be used to determine the appropriate concentration range and route of administration. Such information can then be used to determine useful doses and routes for administration in humans.
- Therapeutic efficacy and toxicity e.g., ED 50 (the dose therapeutically effective in 50% of the population) and LD 50 (the dose lethal to 50% of the population), can be determined by standard pharmaceutical procedures in cell cultures or experimental animals.
- the dose ratio of toxic to therapeutic effects is the therapeutic index, and it can be expressed as the ratio, LD 50 /ED 5 o.
- compositions that exhibit large therapeutic indices are preferred.
- the data obtained from cell culture assays and animal studies is used in formulating a range of dosage for human use.
- the dosage contained in such compositions is preferably within a range of circulating concentrations that include the ED 50 with little or no toxicity.
- the dosage varies within this range depending upon the dosage form employed, sensitivity of the patient, and the route of administration.
- Dosage and administration are adjusted to provide sufficient levels of the active ingredient or to maintain the desired effect.
- Factors that can be taken into account include the severity of the disease state, general health of the subject, age, weight, and gender of the subject, diet, time and frequency of administration, drug combination(s), reaction sensitivities, and tolerance/response to therapy.
- Long-acting pharmaceutical compositions can be administered every 3 to 4 days, every week, or once every two weeks depending on the half-life and clearance rate of the particular formulation.
- Normal dosage amounts can vary from 0.1 to 100,000 micrograms, up to a total dose of about 1 g, depending upon the route of administration.
- Guidance as to particular dosages and methods of delivery is provided in the literature and generally available to practitioners in the art. Those skilled in the art will employ different formulations for nucleotides than for proteins or their inhibitors. Similarly, delivery of polynucleotides or polypeptides will be specific to particular cells, conditions, locations, etc.
- polynucleotides encoding the antibody can be constructed and introduced into a cell either ex vivo or in vivo using well- established techniques including, but not limited to, transferrin-polycation-mediated DNA transfer, transfection with naked or encapsulated nucleic acids, liposome- mediated cellular fusion, intracellular transportation of DNA-coated latex beads, protoplast fusion, viral infection, electroporation, "gene gun,” and DEAE- or calcium phosphate-mediated transfection.
- Effective in vivo dosages of an antibody are in the range of about 5 ⁇ g to about 50 ⁇ g/kg, about 50 ⁇ g to about 5 mg/kg, about 100 ⁇ g to about 500 ⁇ g/kg of patient body weight, and about 200 to about 250 ⁇ g/kg of patient body weight.
- effective in vivo dosages are in the range of about 100 ng to about 200 ng, 500 ng to about 50 mg, about 1 ⁇ g to about 2 mg, about 5 ⁇ g to about 500 ⁇ g, and about 20 ⁇ g to about 100 ⁇ g of DNA.
- the reagent is preferably an antisense oligonucleotide or a ribozyme.
- Polynucleotides that express antisense oligonucleotides or ribozymes can be introduced into cells by a variety of methods, as described above.
- a reagent reduces expression of a phosphatidic acid-preferring phospholipase Al gene or the activity of a phosphatidic acid-preferring phospholipase Al polypeptide by at least about 10, preferably about 50, more preferably about 75, 90, or 100% relative to the absence of the reagent.
- any of the pharmaceutical compositions of the invention can be administered in combination with other appropriate therapeutic agents.
- the combination of therapeutic agents can act syner- gistically to effect the treatment or prevention of the various disorders described above. Using this approach, one may be able to achieve therapeutic efficacy with lower dosages of each agent, thus reducing the potential for adverse side effects.
- any of the therapeutic methods described above can be applied to any subject in need of such therapy, including, for example, mammals such as dogs, cats, cows, horses, rabbits, monkeys, and most preferably, humans.
- Human phosphatidic acid-preferring phospholipase Al also can be used in diagnostic assays for detecting diseases and abnormalities or susceptibility to diseases and abnormalities related to the presence of mutations in the nucleic acid sequences that encode the enzyme. For example, differences can be determined between the cDNA or genomic sequence encoding phosphatidic acid-preferring phospholipase Al in individuals afflicted with a disease and in normal individuals. If a mutation is observed in some or all of the afflicted individuals but not in normal individuals, then the mutation is likely to be the causative agent of the disease.
- Sequence differences between a reference gene and a gene having mutations can be revealed by the direct DNA sequencing method.
- cloned DNA segments can be employed as probes to detect specific DNA segments.
- the sensitivity of this method is greatly enhanced when combined with PCR.
- a sequencing primer can be used with a double-stranded PCR product or a single-stranded template molecule generated by a modified PCR.
- the sequence determination is performed by conventional procedures using radiolabeled nucleotides or by automatic sequencing procedures using fluorescent tags.
- DNA sequence differences can be carried out by detection of alteration in electrophoretic mobility of DNA fragments in gels with or without denaturing agents. Small sequence deletions and insertions can be visualized, for example, by high resolution gel electrophoresis. DNA fragments of different sequences can be distinguished on denaturing formamide gradient gels in which the mobilities of different DNA fragments are retarded in the gel at different positions according to their specific melting or partial melting temperatures (see, e.g., Myers et al, Science 230, 1242, 1985). Sequence changes at specific locations can also be revealed by nuclease protection assays, such as RNase and S 1 protection or the chemical cleavage method (e.g., Cotton et al, Proc. Natl.
- the detection of a specific DNA sequence can be performed by methods such as hybridization, RNase protection, chemical cleavage, direct DNA sequencing or the use of restriction enzymes and Southern blotting of genomic DNA.
- direct methods such as gel-electrophoresis and DNA sequencing, mutations can also be detected by in situ analysis.
- Altered levels of phosphatidic acid-preferring phospholipase Al also can be detected in various tissues.
- Assays used to detect levels of the receptor polypeptides in a body sample, such as blood or a tissue biopsy, derived from a host are well known to those of skill in the art and include radioimmunoassays, competitive binding assays, Western blot analysis, and ELISA assays.
- the polynucleotide of SEQ ID NO: 1 is inserted into the expression vector pCEV4 and the expression vector pCEV4-phosphatidic acid-preferring phospholipase Al polypeptide obtained is transfected into human embryonic kidney 293 cells.
- phosphatidic acid-preferring phospholipase Al- activity is measured in the following assay: 0.05 ml of a 0.1M aqueous solution of calcium chloride and 0.25 ml of a 0.2M aqueous acetate buffer soultion (pH 4.0) are added to 0.5 ml of a solution formed by mixing a 2.0% (w/v) suspension of SLP- White (manufactured by True Lecithin Kogyo Co., Ltd.) and 4% (v/v) Triton X-100. TM. In water. Next, 0.1 ml of the cell extracts is added to the resulting mixture, and the mixture is stirred until a homogeneous mixture results.
- the mixture obtained in this manner is left to stand at 37°C for 10 minutes, in order to allow the enzyme reaction to take place.
- 0.1 ml of a IN aqueous solution of hydrochloric acid is added to the reaction mixture to stop the enzyme reaction.
- a sample of 0.02 ml of the reaction mixture is then taken, and this is used to determine the amount of free fatty acid.
- Free fatty acid is quantified using a free fatty acid quantitative reagent, Determiner NEFA (Kyowa Medex Co, Ltd.). It is shown that the polypeptide of SEQ ID NO: 2 has a phosphatidic acid-preferring phospholipase Al activity.
- Pichia pastoris expression vector pPICZB (Invitrogen, San Diego, CA) is used to produce large quantities of recombinant human phosphatidic acid-preferring phos- pholipase Al polypeptides in yeast.
- a 1 -encoding DNA sequence is derived from SEQ ID NO: 1.
- the DNA sequence is modified by well known methods in such a way that it contains at its 5 '-end an initiation codon and at its 3 '-end an enterokinase cleavage site, a His6 reporter tag and a termination codon.
- the modified DNA sequence is ligated into pPICZB.
- This expression vector is designed for inducible expression in Pichia pastoris, driven by a yeast promoter. The resulting pPICZ/md-His6 vector is used to transform the yeast.
- the yeast is cultivated under usual conditions in 5 liter shake flasks and the recombinantly produced protein isolated from the culture by affinity chromatography (Ni-NTA-Resin) in the presence of 8 M urea.
- the bound polypeptide is eluted with buffer, pH 3.5, and neutralized. Separation of the polypeptide from the His6 reporter tag is accomplished by site-specific proteolysis using enterokinase (Invitrogen, San Diego, CA) according to manufacturer's instructions. Purified human phosphatidic acid-preferring phospholipase Al polypeptide is obtained.
- Purified phosphatidic acid-preferring phospholipase Al polypeptides comprising a glutathione-S-transferase protein and absorbed onto glutathione-derivatized wells of 96-well microtiter plates are contacted with test compounds from a small molecule library at pH 7.0 in a physiological buffer solution.
- Human phosphatidic acid- preferring phospholipase Al polypeptides comprise the amino acid sequence shown in SEQ ID NO: 2.
- the test compounds comprise a fluorescent tag.
- the samples are incubated for 5 minutes to one hour. Control samples are incubated in the absence of a test compound.
- the buffer solution containing the test compounds is washed from the wells.
- Binding of a test compound to a phosphatidic acid-preferring phospholipase Al polypeptide is detected by fluorescence measurements of the contents of the wells.
- a test compound that increases the fluorescence in a well by at least 15% relative to fluorescence of a well in which a test compound is not incubated is identified as a compound which binds to a phosphatidic acid-preferring phospholipase Al polypeptide.
- test compound is administered to a culture of human cells transfected with a phosphatidic acid-preferring phospholipase Al expression construct and incubated at
- a culture of the same type of cells that have not been transfected is incubated for the same time without the test compound to provide a negative control.
- RNA is isolated from the two cultures as described in Chirgwin et al, Biochem. 18,
- Northern blots are prepared using 20 to 30 ⁇ g total RNA and hybridized with a 32 P-labeled phosphatidic acid-prefe ⁇ ing phospholipase Al -specific probe at 65°C in Express-hyb (CLONTECH).
- the probe comprises at least 11 contiguous nucleotides selected from the complement of SEQ ED NO: 1.
- a test compound that decreases the phosphatidic acid-preferring phospholipase Al -specific signal relative to the signal obtained in the absence of the test compound is identified as an inhibitor of phosphatidic acid-preferring phospholipase Al gene expression.
- a test compound is administered to a culture of human cells transfected with a phosphatidic acid-preferring phospholipase Al expression construct and incubated at 37°C for 10 to 45 minutes.
- a culture of the same type of cells that have not been transfected is incubated for the same time without the test compound to provide a negative control, phosphatidic acid-preferring phospholipase Al activity is measured using the method of U.S. Patent 5,538,874.
- a test compound which decreases the phospholipase Al activity of the phosphatidic acid-preferring phospholipase Al relative to the phospholipase Al activity in the absence of the test compound is identified as an inhibitor of phosphatidic acid- prefe ⁇ ing phospholipase Al activity.
- RNA prepared by the Tri-reagent protocol was treated with DNase I to remove genomic DNA contamination.
- poly A+ mRNA was selected using Oligotex kit from Qiagen (Santa Clara, Calif.) according to the manufacturer's specifications. Libraries were constructed using standard methods (Maniatis et al, 1982).
- RNA from each cell or tissue source was first reverse transcribed. Two ⁇ g of total RNA was reverse transcribed using 25 pmole random hexamer primers and 100 pmole poly dT ⁇ 5 (Boehringer Mannheim, Indianapolis,
- RNAsin Promega, Madison Wis.
- the first strand synthesis buffer and Superscript TJ (1 ⁇ l/2 ⁇ l) reverse transcriptase were from Gibco/BRL (Gaithersburg, Md.). Replicate samples were also prepared similarly with the exception that no Superscript TT reverse transcriptase was added; these samples served as controls for genomic contamination.
- the reaction was incubated at 42-45°C for 90 minutes, heated to 95°C for 5 minutes and cooled on ice. The volume was adjusted to 200 ⁇ l with Tris HCI pH 7.4, yielding a final concentration of 10 ng/ ⁇ l of starting RNA.
- the phosphatidic acid-preferring phospholipase Al reverse primer sequence was Primer2 ATCGAGCCTGTGTGCGTGCGG.
- the fluorogenic probe, labeled with FAM as the reporter dye, is Probe 1 TTGGGTCACATCCACCTCGTA.
- RNA sample (where the final concentrations of each component are indicated): lx TaqMan buffer A, 5.5 mM MgCl 2 , 200 nM each of dATP, dCTP, dGTP and dUTP, 0.025 U/ ⁇ l AmpliTaq GoldTM, 0.01 U/ ⁇ l AmpErase UNG.RTM., HPRT forward, reverse primers and probe IX, phosphatidic acid-preferring phospholipase Al forward and reverse primers each at 200 nM, 100 nM X FAM-labeled probe, and 20 ng of template cDNA (from cells and tissue or 40 ng from libraries). Thermal cycling parameters were 2 min HOLD at 50°C, 10 min HOLD at 95°C, followed by melting at 95 °C for 15 sec and annealing/extending at 60°C for 1 min for each of 40 cycles.
- Relative quantitation of the phosphatidic acid-preferring phospholipase Al mRNA levels was done using the comparative CT method described in the ABI 7700 Sequence Detection System User Bulletin #2 for multiplex reactions.
- C T (threshold cycle) values representing the first PCR cycle at which an increase in reporter fluorescence signal above baseline is detected, were determined for each gene.
- C T threshold cycle
- the following human tissues were used: coronary smooth muscle cells, brain, testis, pancreas, stomach, cerebellum, trachea, adrenal gland, skeletal muscle, salivary gland, small intestine, prostate, fetal liver, placenta, fetal brain, uterus, mammary gland, heart, spleen, lung, HeLa cells, liver, kidney, thymus, bone marrow, thyroid, colon, bladder, spinal cord, peripheral blood, liver, ci ⁇ hotic liver, pancreas liver cirrhosis, spleen liver ci ⁇ hosis, total Alzheimer brain, fetal lung, breast tumor, colon tumor, lung tumor, HEK 293 cells, adipose, pericardium, fetal heart, thyroid tumor, MDA MB 231 cells, HEP G2 cells, HUVEC cells, fetal kidney, breast, Jurkat T-cells,
- Alzheimer brain cortex cervix, esophagus, thalamus, precentral gyrus, hippocampus, occipital lobe, cerebral peduncles, postcentral gyrus, temporal lobe, parietal lobe, cerebellum (right), cerebellum (left), tonsilla cerebelli, cerebral meninges, pons, frontal lobe, cerebral cortex, corpus callosum, vermis cerebelli, Alzheimer brain frontal lobe, interventricular septum, heart atrium (right), heart atrium (left), and heart ventricle (left)
- the results of the mRNA-quantification (expression profiling) are shown in Figs.12- 14.
- the phosphatidic acid-preferring phospholipase Al is highly expression in fetal brain, cerebral cortex, Alzheimer brain cortex, frontal lobe, Alzheimer brain frontal lobe, cerebellum, cerebellum (right), cerebellum (left), tonsilla cerebelli, precentral gyrus, hippocampus, occipital lobe, cerebral peduncles, postcentral gyrus, temporal lobe, parietal lobe, cerebral meninges, pons, corpus callosum, vermis cerebelli, spinal cord, thalamus, interventricular septum, HEK293 cells and cervix.
- the results of the expression profiling suggest an association between phosphatidic acid-preferring phospholipase Al and the indications cardiovascular diseases, CNS diseases, and genitourinary diseases.
- Membrane lipids have multiple effects on interfacial catalysis by a phosphatidic acid-preferring phospholipase Al from bovine testis. Biochemistry 2000 Aug 8;39(31):9335-44 SEQUENCE LISTING
- Lys Thr Trp Lys Pro Phe lie Gly Tyr Asp Cys Val Arg lie Glu Leu 180 185 190
- Gly Gin Trp Phe lie Asp Gly Thr Trp Gin Pro Leu Glu Glu Glu Glu 290 295 300
- Gin Lys Met Asp Gin Gly Arg lie lie Lys Asn Thr Ala Met Met Met Arg 420 425 430
- Glu Ala Ala Arg Lys lie Glu Glu Arg His Phe Ser Asn His Ala Thr 435 440 445
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002308285A AU2002308285A1 (en) | 2001-02-21 | 2002-02-18 | Regulation of human phosphatidic acid-preferring phospholipase a1 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US26985601P | 2001-02-21 | 2001-02-21 | |
US60/269,856 | 2001-02-21 | ||
US30148301P | 2001-06-29 | 2001-06-29 | |
US60/301,483 | 2001-06-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002066623A2 true WO2002066623A2 (en) | 2002-08-29 |
WO2002066623A3 WO2002066623A3 (en) | 2003-01-30 |
Family
ID=26953944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/001684 WO2002066623A2 (en) | 2001-02-21 | 2002-02-18 | Regulation of human phosphatidic acid-preferring phospholipase a1 |
Country Status (2)
Country | Link |
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AU (1) | AU2002308285A1 (en) |
WO (1) | WO2002066623A2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002020738A2 (en) * | 2000-09-08 | 2002-03-14 | Millennium Pharmaceuticals, Inc. | 27877, a phospholipase and uses therefor |
WO2002046418A2 (en) * | 2000-12-08 | 2002-06-13 | Incyte Genomics, Inc. | Lipid-associated molecules |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2074201A (en) * | 1999-12-08 | 2001-06-18 | Millennium Pharmaceuticals, Inc. | Novel genes, compositions, kits, and methods for identification, assessment, prevention, and therapy of cervical cancer |
WO2001060860A2 (en) * | 2000-02-17 | 2001-08-23 | Millennium Predictive Medicine, Inc. | Genes differentially expressed in human prostate cancer and their use |
-
2002
- 2002-02-18 WO PCT/EP2002/001684 patent/WO2002066623A2/en active Search and Examination
- 2002-02-18 AU AU2002308285A patent/AU2002308285A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002020738A2 (en) * | 2000-09-08 | 2002-03-14 | Millennium Pharmaceuticals, Inc. | 27877, a phospholipase and uses therefor |
WO2002046418A2 (en) * | 2000-12-08 | 2002-06-13 | Incyte Genomics, Inc. | Lipid-associated molecules |
Non-Patent Citations (6)
Title |
---|
DATABASE EMBL [Online] 13 May 2000 (2000-05-13) HEILIG R. ET AL.: "Human chromosome 14 DNA sequence BAC R-547D23 of library RPCI-11 from chromosome 14 of Homo sapiens (Human)" Database accession no. CNS05TDA XP002195659 * |
DATABASE EMBL [Online] 5 December 2000 (2000-12-05) "uz84c02.y1 NCI_CGAP_Lu29 Mus musculus cDNA clone IMAGE:3675746 5' similar to TR:O46606 O46606 PHOSPHATIDIC ACID-PREFERRING PHOSPHOLIPASE A1. ;, mRNA sequence." Database accession no. BF452087 XP002219784 * |
DATABASE GENESEQ [Online] 16 September 2002 (2002-09-16) SCHLEGEL R ET AL.: "Human prostate expression marker cDNA 24195." Database accession no. ABV24204 XP002219785 & WO 01 60860 A (MILLENNIUM PREDICTIVE MEDICINE) 23 August 2001 (2001-08-23) * |
DATABASE GENESEQ [Online] 19 September 2001 (2001-09-19) SCHLEGEL R. ET AL.: "Human cervical cancer marker nucleic acid 4519." Database accession no. AAH73245 XP002195655 & WO 01 42467 A (MILLENNIUM PREDICTIVE MEDICINE) 14 June 2001 (2001-06-14) * |
HIGGS H N ET AL: "CLONING OF A PHOSPHATIDIC ACID-PREFERRING PHOSPHOLIPASE A1 FROM BOVINE TESTIS" JOURNAL OF BIOLOGICAL CHEMISTRY, AMERICAN SOCIETY OF BIOLOGICAL CHEMISTS, BALTIMORE, MD, US, vol. 273, no. 10, 6 March 1998 (1998-03-06), pages 5468-5477, XP002949599 ISSN: 0021-9258 * |
HIGGS HENRY N ET AL: "Purification and properties of a phosphatidic acid-preferring phospholipase A-1 from bovine testis: Examination of the molecular basis of its activation." JOURNAL OF BIOLOGICAL CHEMISTRY, vol. 271, no. 18, 1996, pages 10874-10883, XP002219783 ISSN: 0021-9258 * |
Also Published As
Publication number | Publication date |
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AU2002308285A1 (en) | 2002-09-04 |
WO2002066623A3 (en) | 2003-01-30 |
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