EP1285071A2 - Duale oxidasen als mitogene und endokrine regulatoren - Google Patents
Duale oxidasen als mitogene und endokrine regulatorenInfo
- Publication number
- EP1285071A2 EP1285071A2 EP01939033A EP01939033A EP1285071A2 EP 1285071 A2 EP1285071 A2 EP 1285071A2 EP 01939033 A EP01939033 A EP 01939033A EP 01939033 A EP01939033 A EP 01939033A EP 1285071 A2 EP1285071 A2 EP 1285071A2
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Classifications
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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
- C12N9/0004—Oxidoreductases (1.)
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P11/00—Drugs for disorders of the respiratory system
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P13/00—Drugs for disorders of the urinary system
- A61P13/08—Drugs for disorders of the urinary system of the prostate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P17/00—Drugs for dermatological disorders
- A61P17/06—Antipsoriatics
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P5/00—Drugs for disorders of the endocrine system
- A61P5/14—Drugs for disorders of the endocrine system of the thyroid hormones, e.g. T3, T4
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/10—Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/12—Antihypertensives
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2217/00—Genetically modified animals
- A01K2217/05—Animals comprising random inserted nucleic acids (transgenic)
Definitions
- the present invention relates to the fields of normal and abnormal cell growth, in particular mitogenic regulation, to thyroid hormone biosynthesis and to nematode cuticle biogenesis.
- the present invention provides the following: nucleotide sequences encoding for the production of enzymes that are mitogenic regulators, that catalyze thyroid hormone biosynthesis and in nematodes catalyze the biogenesis of cuticle; amino acid sequences of these enzymes; vectors containing these nucleotide sequences; methods for transfecting cells with vectors that produce these enzymes; and antibodies to these enzymes that are useful for detecting and measuring levels of these enzymes, and for binding to cells possessing extracellular epitopes of these enzymes.
- ROI Reactive oxygen intermediates
- 1 electron reduces O 2 to form superoxide (O 2 " )
- 2 electrons reduce O 2 to form hydrogen peroxide (H 2 O 2 ).
- ROI are generated as a byproduct of aerobic metabolism and by toxicological mechanisms.
- SOD superoxide dismutase
- Phagocytic cells such as neutrophils generate large quantities of ROI as part of their battery of bactericidal mechanisms. Exposure of neutrophils to bacteria or to various soluble mediators such as formyl-
- Met-Leu-Phe or phorbol esters activates a massive consumption of oxygen, termed the respiratory burst, to initially generate superoxide, with secondary generation of H 2 O 2 , HOC1 and hydroxyl radical.
- the enzyme responsible for this oxygen consumption is the respiratory burst oxidase (nicotinamide adenine dinucleotide phosphate-reduced form (NADPH) oxidase).
- ROI generation is implicated in metabolic conversions such as the biosynthesis of thyroid hormone.
- Significant generation of H 2 O 2 , O 2 " , or both have been noted in some cell types.
- Fibroblasts and human endothelial cells show increased release of superoxide in response to cytokines such as interleukin-1 or tumor necrosis factor (TNF) (Meier et al. (1989) Biochem J. 263, 539-545.; Matsubara et al. (1986) J.
- TNF tumor necrosis factor
- Ras-transformed fibroblasts show increased superoxide release compared with control fibroblasts (Irani, et al. (1997) Science 275, 1649-1652).
- Rat vascular smooth muscle cells show increased H 2 O 2 release in response to PDGF (Sundaresan et al. (1995) Science 270, 296-299) and angiotensin II (Griendling et al.
- BHK-21 cells fat cells
- 3T3 LI cells human colonic epithelial cells
- ROI generated by the neutrophil have a cytotoxic function. While ROI are normally directed at the invading microbe, ROI can also induce tissue damage (e.g., in inflammatory conditions such as arthritis, shock, lung disease, and inflammatory bowel disease) or may be involved in tumor initiation or promotion, due to damaging effects on DNA. Nathan (Szatrowski et al. (1991) Cane. Res. 51, 794-798) proposed that the generation of ROI in tumor cells may contribute to the hypermutability seen in tumors, and may therefore contribute to tumor heterogeneity, invasion and metastasis.
- ROI In addition to cytotoxic and mutagenic roles, ROI have ideal properties as signal molecules: 1) they are generated in a controlled manner in response to upstream signals; 2) the signal can be terminated by rapid metabolism of O 2 " and H 2 O 2 by SOD and catalase/peroxidases; 3) they elicit downstream effects on target molecules, e.g., redox-sensitive regulatory proteins such as NF kappa B and AP-1 (Schreck et al. (1991) EMBO J. 10, 2247-2258; Schmidt et al. (1995) Chemistry & Biology 2, 13-22). Oxidants such as O 2 " and H O 2 have a relatively well defined signaling role in bacteria, operating via the SoxI/II regulon to regulate transcription.
- ROI appear to have a direct role in regulating cell division, and may function as mitogenic signals in pathological conditions related to growth. These conditions include cancer and cardiovascular disease.
- O 2 " is generated in endothelial cells in response to cytokines, and might play a role in angiogenesis (Matsubara et al. (1986) J. Immun. 137, 3295-3298).
- O 2 " andH 2 O 2 are also proposed to function as "life-signals", preventing cells from undergoing apoptosis (Matsubara et al. (1986) J. Immun. 137, 3295- 3298). As discussed above, many cells respond to growth factors
- PDGF platelet derived growth factor
- EGF epidermal derived growth factor
- angiotensin II angiotensin II
- various cytokines e.g., platelet derived growth factor (PDGF), epidermal derived growth factor (EGF), angiotensin II, and various cytokines
- Balb/3T3 cells Balb/3T3 cells human histiocytic leukemia rat, hamster fibroblasts mouse epidermal cells human smooth muscle cells rat colonic epithelial cells rat vascular smooth muscle rat vascular smooth muscle cells cells
- non-transformed cells can respond to growth factors and cytokines with the production of ROI
- tumor cells appear to produce ROI in an uncontrolled manner.
- a series of human tumor cells produced large amounts of hydrogen peroxide compared with non-tumor cells (Szatrowski et al. (1991) Cane. Res. 51, 794-798).
- Ras-transformed NIH 3T3 cells generated elevated amounts of superoxide, and inhibition of superoxide generation by several mechanisms resulted in a reversion to a "normal" growth phenotype.
- O 2 has been implicated in maintenance of the transformed phenotype in cancer cells including melanoma, breast carcinoma, fibrosarcoma, and virally transformed tumor cells.
- MnSOD manganese form of SOD
- ROI are implicated in growth of vascular smooth muscle associated with hypertension, atherosclerosis, and restenosis after angioplasty.
- O 2 " generation is seen in rabbit aortic adventitia (Pagano et al. (1997) Proc. Natl. Acad. Sci. 94, 14483-14488).
- Vascular endothelial cells release O 2 " in response to cytokines (Matsubara et al. (1986) J. Immun. 137, 3295-3298).
- O 2 " is generated by aortic smooth muscle cells in culture, and increased O 2 " generation is stimulated by angiotensin II which also induces cell hypertrophy.
- the neutrophil NADPH oxidase also known as phagocyte respiratory burst oxidase, provides a paradigm for the study ofthe specialized enzymatic ROI-generating system. This extensively studied enzyme oxidizes NADPH and reduces oxygen to form O 2 " .
- NADPH oxidase consists of multiple proteins and is regulated by assembly of cytosolic and membrane components.
- the catalytic moiety consists of flavocytochrome b 558 , an integral plasma membrane enzyme comprised of two components: gp91phox (gp refers to glycoprotein; phox is an abbreviation of the words phagocyte and oxidase) and p22phox (p refers to protein).
- gp91phox contains 1 flavin adenine dinucleotide (FAD) and 2 hemes as well as the NADPH binding site.
- p22phox has a C-terminal proline-rich sequence which serves as a binding site for cytosolic regulatory proteins.
- the two cytochrome subunits, gp91phox and p22phox appear to stabilize one another, since the genetic absence of either subunit, as in the inherited disorder chronic granulomatous disease (CGD), results in the absence of the partner subunit (Yu et al. (1997) J. Biol. Chem. 272, 27288- 27294).
- Essential cytosolic proteins include p47phox, p67phox and the small GTPase Rac, of which there are two isoforms.
- p47phox and p67phox both contain SH 3 regions and proline-rich regions which participate in protein interactions governing assembly of the oxidase components during activation.
- the neutrophil enzyme is regulated in response to bacterial phagocytosis or chemotactic signals by phosphorylation of p47phox, and perhaps other components, as well as by guanine nucleotide exchange to activate the GTP-binding protein Rac.
- RT-PCR The message for p22phox is expressed widely, as is that for Racl.
- Several cell types that are capable of O 2 " generation have been demonstrated to contain all of the phox components including gp91phox, as summarized below in Table 3. These cell types include endothelial cells, aortic adventitia and lymphocytes. Table 3
- Thyroid hormone regulates basal metabolic rate through end- effects on mitochondrial respiration, and conditions of under- or overproduction are important clinically. Development of drugs to regulate the biosynthesis of thyroid hormone is a medically important goal, and identification ofthe enzymes in this pathway is key to developing pharmacologically relevant targets.
- Thyroid uniquely concentrates iodide, which is used to iodinate tyrosine residues on thyroglobulin (TG).
- TG is a large protein (660 kDa) that contains 67 tyrosyl residues, some of which are preferential sites for iodination. Iodination of tyrosines in TG is catalyzed by thyroid peroxidase
- TPO a plasma membrane hemoprotein. Iodination requires a previously unidentified enzymatic source of H 2 O 2 .
- a second step is the coupling of two diiodotyrosines (DIT) to form protein-associated thyroxine (T4), which is subsequently proteolytically cleaved from TG to liberate free T4.
- DIT diiodotyrosines
- T4 protein-associated thyroxine
- T4 protein-associated thyroxine
- T4 protein-associated thyroxine
- What is needed is a composition of the gene that encodes the enzyme that generates H 2 O 2 in thyroid and that catalyzes the coupling reaction, and a method of using that composition to modulate thyroid hormone biosynthesis. Such information would be useful in the development of drugs for modulation of thyroid function. Such modulation might be useful in the treatment of hyperthyroidism.
- Parasitic diseases are a major cause of morbidity and mortality worldwide in humans and animals, and have a significant impact on agricultural productivity as well. Parasitic diseases have proven difficult to treat, in part due to the presence of the cuticle, a tough exoskeletal structure of parasites such as nematodes. What is needed is a composition and method of using the composition to fight parasitic diseases, including but not limited to those parasitic diseases caused by parasites with cuticles.
- the present invention solves the problems described above by providing a novel family of nucleotide sequences and proteins encoded by these nucleotide sequences termed duox proteins.
- the present invention provides compositions comprising the nucleotide sequences SEQ ID NO: 1 and SEQ ID NO: 3, and fragments and conservative substitutions thereof, which encode for the expression of proteins comprising SEQ ID NO: 2 and SEQ ID NO: 4 respectively, and fragments and conservative substitutions thereof.
- Preferred protein fragments include, but are not limited to, SEQ ID NO: 31 and SEQ ID NO: 32. While not wanting to be bound by the following statement, it is believed that these proteins are involved in ROI production and are capable of stimulating superoxide production or generating peroxidative reactions.
- the present invention also provides vectors containing these nucleotide sequences, cells transfected with these vectors which produce the proteins comprising SEQ ID NO: 2 and SEQ ID NO: 4, and fragments and conservative substitutions thereof, and antibodies to these proteins and fragments and conservative substitutions thereof.
- the present invention also provides methods for stimulating cellular proliferation by administering vectors encoded for production of the proteins comprising SEQ ID NO: 2 and SEQ ID NO: 4 and fragments and conservative substitutions thereof.
- the present invention also provides methods for stimulating cellular proliferation by administering the proteins comprising SEQ ID NO: 2 and SEQ ID NO: 4 and fragments and conservative substitutions thereof.
- the proteins comprising SEQ ID NO: 2 and SEQ ID NO: 4 and fragments and conservative substitutions thereof are useful in affecting the exoskeleton, especially the cuticle of parasites, including but not limited to nematodes.
- the nucleotides and antibodies of the present invention are useful for the detection, localization and measurement of the nucleic acids encoding for the production of the proteins of the present invention, and also for the detection, localization and measurement of the proteins of the present invention.
- nucleotides and antibodies can be combined with other reagents in kits for the purposes of detection, localization and measurement.
- the present invention involves a method for regulation of cell division or cell proliferation by modifying the activity or expression ofthe duox proteins described as
- SEQ ID NO: 2 and SEQ ID NO: 4 or fragments or conservative substitutions thereof.
- These proteins in their naturally occurring or expressed forms, are expected to be useful in drag development, for example for screening of chemical and drag libraries by observing inhibition of the activity of these enzymes.
- Such chemicals and drags would likely be useful as treatments for cancer, prostatic hypertrophy, benign prostatic hypertrophy, hypertension, metabolic disease, fibrosis, atherosclerosis and many other disorders involving abnormal cell growth or proliferation, and a variety of parasitic diseases in both animals and crops as described below.
- the entire expressed protein may be useful in these assays.
- Portions ofthe molecule which may be targets for inhibition or modification include but are not limited to the binding site for pyridine nucleotides (NADPH or NADH), the flavoprotein domain (approximately the C-terminal 265 amino acids), and/or the binding or catalytic site for flavin adenine dinucleotide
- the method of the present invention may be used for the development of drags or other therapies for the treatment of conditions associated with abnormal growth including, but not limited to the following: cancer, fibrosis, lung fibrosis, metabolic imbalances, thyroid imbalances, hyperthryoidism, psoriasis, prostatic hypertrophy, benign prostatic hypertrophy, cardiovascular disease, proliferation of vessels, including but not limited to blood vessels and lymphatic vessels, arteriovenous malformation, vascular problems associated with the eye, atherosclerosis, hypertension, and restenosis following angioplasty and parasitic diseases.
- the enzymes of the present invention are excellent targets for the development of drugs and other agents which may modulate the activity of these enzymes. It is to be understood that modulation of activity may result in enhanced, diminished or absence of enzymatic activity. Modulation of the activity of these enzymes may be useful in treatment of conditions, including but not limited to conditions associated with abnormal growth, metabolic disorders, and fibrosis.
- Drugs which affect the activity of the duox enzymes represented in SEQ ID NO: 2 and SEQ ID NO: 4, or fragments or conservative substitutions thereof, may also be combined with other therapeutics in the treatment of specific conditions.
- these drags may be combined with angiogenesis inhibitors in the treatment of cancer, with antihypertensives for the treatment of hypertension, with cholesterol lowering drags for the treatment of atherosclerosis and with hormonal agonists or antagonists in the treatment of endocrine disorders, such as thyroid disorders.
- proteins of the present invention may be administered together with other compositions such as anti-parasitic compositions, pesticides, herbicides and fertilizers. Accordingly, the proteins of the present invention may be useful alone or in combination with other compositions for treating humans or animals, including livestock, other farm animals and domestic animals, including pets, for preventing or fighting parasitic disease, for protecting plants and crops against attack by parasites, especially soil nematodes, and for destroying parasites.
- an object of the present invention is to provide nucleotide sequences, or fragments thereof or conservative substitutions thereof, encoding for the production of proteins, or fragments thereof or conservative substitutions thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions.
- It is another object of the present invention is to provide the proteins represented in SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 31, and SEQ ID NO: 32 or fragments or conservative substitutions thereof.
- It is another object of the present invention is to provide the nucleotide sequences encoding for the proteins represented in SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 31, and SEQ ID NO: 32 or fragments or conservative substitutions thereof, wherein these nucleotide sequence include SEQ ID NO: 1, SEQ ID NO: 3 or fragments or conservative substitutions thereof.
- Yet another object of the present invention is to provide cells transfected with these vectors.
- Still another object of the present invention is to administer cells transfected with these vectors to animals and humans.
- Another object of the present invention is to provide proteins, or fragments thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions.
- Still another object of the present invention is to provide antibodies, including monoclonal and polyclonal antibodies, or fragments thereof, raised against proteins, or fragments thereof or conservative substitutions thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions.
- Such antibodies are useful in the localization and measurement of proteins, or fragments thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions.
- Another object ofthe present invention is to administer genes containing nucleotide sequences, or fragments thereof, encoding for the production of proteins, or fragments thereof or conservative substitutions thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions, to animals and humans and also to cells obtained from animals and humans.
- Another object ofthe present invention is to administer antisense complimentary sequences of genes containing nucleotide sequences, or fragments thereof or conservative substitutions thereof, encoding for the production of proteins, or fragments thereof or conservative substitutions thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions, to animals and humans and also to cells obtained from animals and humans.
- Yet another object of the present invention is to provide a method for stimulating or inhibiting cellular proliferation by administering vectors containing nucleotide sequences, or fragments thereof, encoding for the production of proteins, or fragments thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions, to animals and humans. It is also an object of the present invention to provide a method for stimulating or inhibiting cellular proliferation by administering vectors containing antisense complimentary sequences of nucleotide sequences, or fragments thereof, encoding for the production of proteins, or fragments thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions, to animals and humans. These methods of stimulating cellular proliferation are useful for a variety of purposes, including but not limited to, developing animal models of tumor formation, stimulating cellular proliferation of blood marrow cells following chemotherapy or radiation, or in cases of anemia.
- Yet another object of the present invention is to provide nucleotide probes useful for the detection, localization and measurement of nucleotide sequences, or fragments thereof, encoding for the production of proteins, or fragments thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions.
- Another object of the present invention is to provide kits useful for detection of nucleic acids including the nucleic acids represented in SEQ ID NO: 1, and SEQ ID NO: 3, or fragments thereof or conservative substitutions thereof, that encode for proteins, or fragments thereof or conservative substitutions thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions.
- Yet another object of the present invention is to provide kits useful for detection and measurement of nucleic acids including the nucleic acids represented in SEQ ID NO: 1, and SEQ ID NO: 3, or fragments thereof, that encode for proteins, or fragments thereof or conservative substitutions thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions.
- Another object of the present invention is to provide kits useful for detection of proteins, including the proteins represented in SEQ ID NO: 2 and SEQ ID NO: 4 or fragments thereof, that are involved in ROI production, stimulate superoxide production or generate peroxidative reactions.
- Yet another object of the present invention is to provides kits useful for the detection, measurement or localization of nucleic acids, or fragments thereof, encoding for proteins, or fragments thereof, that are involved in ROI production, for use in diagnosis and prognosis of abnormal cellular proliferation related to
- Another object of the present invention is to provides kits useful for the detection, measurement or localization of proteins, or fragments thereof, that are involved in ROI production, for use in diagnosis and prognosis of abnormal cellular proliferation related to
- Figure 1 Stracture of large homologs of gp9lphox. Domain structure of Duox proteins. Secretory signal peptide sequences are indicated by a gray triangle, while predicted transmembrane alpha helices are indicated by a hashed rectangle. White ovals indicate regions showing homology with EF-hand calcium binding sites.
- MPO myeloperoxidase
- TPO thyroid peroxidase
- EPO eosinophil peroxidase
- LPO lactoperoxidase
- Pxsn.dros Drosophila peroxidasin.
- Residues which are conserved among all 7 proteins are shown with black boxes, while those matching a derived consensus sequence are shown in line boxes. Filled circles indicate residues which are proposed to provide contacts with the heme, based on the crystal stracture of canine myeloperoxidase (Zeng and Fenna, 1992).
- duox refers to "dual oxidase”.
- the present invention provides novel compositions comprising the nucleotide sequences SEQ ID NO: 1, and SEQ ID NO: 3, and fragments thereof or conservative substitutions thereof, which encode, respectively, for the expression of proteins comprising SEQ ID NO: 2 and SEQ ID NO: 4 and fragments thereof or conservative substitutions thereof.
- Preferred protein fragments include, but are not limited to SEQ ID NO: 31 and SEQ ID NO: 32.
- duox proteins described herein have homology to the gp91phox protein involved in ROI generation, however, the duox proteins comprise a novel and distinct family of proteins.
- the duox proteins described herein have three distinct regions: the amino terminal region having homology to peroxidase proteins, the internal region having homology to calmodulin (CAM) proteins and the carboxy-terminal region having homology to mox (also called nox) proteins.
- the amino acid sequence of human duox2 is shown in SEQ ID NO: aseukin (IL-1) proteins.
- duox2 proteins are also shown in SEQ ID NO: 1.
- comparison of the sequence of human duoxl and human duox2 with genomic databases using BLAST searching resulted in the identification of two homologs of duox in C. elegans (Ce-duoxl SEQ ID NO: 3) and the pseudogene Ce-duox2.
- Drosophila also appears to have at least one duox homolog.
- the duox family of genes/proteins is widely distributed among multicellular organisms.
- High molecular weight homologs of gp91phox have been identified in human (h) and C. elegans (Ce), and are termed Duox for "dual oxidase” because they have both a peroxidase- homology domain and a gp91p/zox domain.
- Ce-Duox uses cytosolic NADPH to generate reactive oxygen. It catalyzes cross-linking of free tyrosine ethyl ester involved in the stabilization of the cuticular extracellular matrix in nematodes.
- duox enzymes for example duox2 and Ce-duoxl, have dual enzymatic functions, catalyzing both the generation of superoxide and peroxidative type reactions.
- the latter class of reactions utilize hydrogen peroxide as a substrate (and in some cases have been proposed to utilize superoxide as a substrate).
- peroxidases can participate in a variety of reactions including halogenation such as the generation of hypochlorous acid (HOC1) by myeloperoxidase and the iodination of tyrosine to form thyroxin by thyroid peroxidase.
- HOC1 hypochlorous acid
- Peroxidases have also been documented to participate in the metabolism of polyunsaturated fatty acids, and in the chemical modification of tyrosine in collagen (by sea urchin ovoperoxidase).
- the predicted transmembrane nature of duox2 facilitates its function in the formation or modification of extracellular matrix or basement membrane. Since the extracellular matrix plays an important role in tumor cell growth, invasion and metastasis, it is believed that the duox type enzymes play a pathogenic role in such conditions.
- the present invention also provides vectors containing these nucleotide sequences and fragments thereof or conservative substitutions thereof, cells transfected with these vectors which produce the proteins comprising SEQ ID NO: 2 and SEQ ID NO: 4 and fragments thereof or conservative substitutions thereof, and antibodies to these proteins and fragments thereof.
- the present invention also provides methods for stimulating cellular proliferation by administering vectors, or cells containing vectors, encoded for production of the proteins comprising SEQ ID NO: 2, SEQ ID NO:
- nucleotides and antibodies of the present invention are useful for the detection, localization and measurement of the nucleic acids encoding for the production of the proteins of the present invention, and also for the detection, localization and measurement of the proteins of the present invention.
- nucleotides and antibodies can be combined with other reagents in kits for the purposes of detection, localization and measurement. These kits are useful for diagnosis and prognosis of conditions involving cellular proliferation associated with production of reactive oxygen intermediates.
- the present invention solves the problems described above by providing a composition comprising the nucleotide sequence SEQ ID NO: 1 and fragments thereof and conservative substitutions thereof.
- the present invention also provides a composition comprising the nucleotide sequence SEQ ID NO: 3 and fragments thereof and conservative substitutions thereof.
- the present invention provides a composition comprising the protein SEQ ID NO: 2, and fragments and conservative substitutions thereof, encoded by the nucleotide sequence SEQ ID NO: 1 and fragments and conservative substitutions thereof.
- the present invention provides a composition comprising the protein SEQ ID NO: 4 and fragments and conservative substitutions thereof, encoded by the nucleotide sequence SEQ ID NO: 3 and fragments and conservative substitutions thereof.
- Preferred protein fragments include, but are not limited to, SEQ ID NO: 31 and SEQ ID NO: 32.
- the present invention also provides vectors containing the nucleotide sequences SEQ ID NO: 1, and SEQ ID NO: 3 or fragments thereof.
- the present invention also provides cells transfected with these vectors.
- the present invention provides cells stably transfected with the nucleotide sequence SEQ ID NO: 1 or fragments thereof.
- the present invention also provides cells stably transfected with the nucleotide sequence SEQ ID NO: 3 or fragments thereof.
- the present invention provides cells stably transfected with the nucleotide sequence SEQ ID NO: 1 or fragments or conservative substitutions thereof, which produce the protein SEQ ID NO: 1
- the present invention provides cells stably transfected with the nucleotide sequence SEQ ID NO: 3 or fragments or conservative substitutions thereof which produce the protein SEQ ID NO: 4 or fragments or conservative substitutions thereof.
- the present invention provides a method for stimulating growth by administering cells stably transfected with the nucleotide sequence SEQ ID NO: 1 or fragments or conservative substitutions thereof which produce the protein SEQ ID NO: 2 or fragments or conservative substitutions thereof.
- the present invention also provides a method for stimulating growth by administering cells stably transfected with the nucleotide sequence SEQ ID NO: 3 or fragments or conservative substitutions thereof, which produce the protein SEQ ID NO: 4 or fragments or conservative substitutions thereof.
- the present invention provides a method for stimulating tumor formation by administering cells stably transfected with the nucleotide sequence SEQ ID NO: 1 or fragments thereof, which produce the protein SEQ ID NO: 2 or fragments thereof.
- the present invention also provides a method for stimulating tumor formation by administering cells stably transfected with the nucleotide sequence SEQ ID NO: 3 or fragments thereof, which produce the protein SEQ ID NO: 4 or fragments thereof.
- the present invention may also be used to develop anti-sense nucleotide sequences to SEQ ID NO: 1 and SEQ ID NO: 3, or fragments thereof. These anti-sense molecules may be used to interfere with translation of nucleotide sequences, such as SEQ ID NO: 1, and SEQ ID NO: 3, or fragments thereof, that encode for proteins such as SEQ ID NO: 2, SEQ ID NO: 4, or fragments thereof.
- the present invention also provides a method for high throughput screening of drags and chemicals which modulate the proliferative activity of the enzymes of the present invention or fragments or conservative substitutions thereof, thereby affecting cell division, metabolic activity, cuticle formation, fibrosis and other biological functions involving oxidative reactions.
- Combinatorial chemical libraries may be screened for chemicals which modulate the proliferative activity or oxidative activity of these enzymes.
- Drags and chemicals may be evaluated based on their ability to modulate the enzymatic activity ofthe expressed or endogenous proteins, including those represented SEQ ID NO: 2 and SEQ ID NO: 4 or fragments or conservative substitutions thereof. Endogenous proteins may be obtained from many different tissues or cells, such as colon cells.
- Drags may also be evaluated based on their ability to bind to the expressed or endogenous proteins represented by SEQ ID NO: 2 and SEQ ID NO: 4 or fragments or conservative substitutions thereof.
- Enzymatic activity may be NADPH- or NADH-dependent superoxide generation catalyzed by the holoprotein.
- Enzymatic activity may also be NADPH- or NADH-dependent diaphorase activity catalyzed by either the holoprotein or the flavoprotein domain.
- flavoprotein domain is meant approximately the C- terminal half of the enzymes shown in SEQ ID NO: 2 and SEQ ID NO: 4, or fragments or conservative substitutions thereof, (approximately the C-terminal 265 amino acids).
- This fragment of gp91phox has NADPH-dependent reductase activity towards cytochrome c, nitrobluetetrazolium and other dyes.
- Expressed proteins or fragments thereof can be used for robotic screens of existing combinatorial chemical libraries. While not wanting to be bound by the following statement, it is believed that the NADPH or
- NADH binding site and the FAD binding site are useful for evaluating the ability of drags and other compositions to bind to the duox enzymes or fragments or conservative substitutions thereof, or to modulate their enzymatic activity.
- the use of the holoprotein or the C-terminal half or end regions are preferred for developing a high throughput drug screen.
- the N-terminal one-third of the duox domain (the peroxidase domain) may also be used to evaluate the ability of drugs and other compositions to inhibit the peroxidase activity, and for further development of a high throughput drug screen.
- the present invention also provides antibodies directed to the oxidative enzymes such as SEQ ID NO: 2 and SEQ ID NO: 4 and fragments or conservative substitutions thereof.
- Preferred protein fragments include, but are not limited to, SEQ ID NO: 31 and SEQ ID NO: 32.
- the antibodies of the present invention are useful for a variety of purposes including localization, detection and measurement of the proteins SEQ ID NO: 2 and SEQ ID NO: 4 and fragments or conservative substitutions thereof.
- the antibodies may be employed in kits to accomplish these purposes. These antibodies may also be linked to cytotoxic agents for selected killing of cells.
- the term antibody is meant to include any class of antibody such as IgG, IgM and other classes.
- the term antibody also includes a completely intact antibody and also fragments thereof, including but not limited to Fab fragments and Fab + Fc fragments.
- the present invention also provides the nucleotide sequences SEQ ID NO: 1 and SEQ ID NO: 3 and fragments or conservative substitutions thereof.
- These nucleotides are useful for a variety of purposes including localization, detection, and measurement of messenger RNA involved in synthesis of the proteins represented as SEQ ID NO: 2 and SEQ ID NO: 4 and fragments or conservative substitutions thereof.
- These nucleotides may also be used in the construction of labeled probes for the localization, detection, and measurement of nucleic acids such as messenger RNA or alternatively for the isolation of larger nucleotide sequences containing the nucleotide sequences shown in SEQ ID NO: 1, and SEQ ID NO: 3 or fragments or conservative substitutions thereof.
- nucleotide sequences may be used to isolate homologous strands from other species using techniques known to one of ordinary skill in the art. These nucleotide sequences may also be used to make probes and complementary strands. Most particularly, the present invention involves a method for modulation of growth by modifying the proteins represented as SEQ ID NO: 2 and SEQ ID NO: 4 or fragments or conservative substitutions thereof.
- mitogenic regulators is used herein to mean any molecule that acts to affect cell division.
- animal is used herein to mean humans and non-human animals of both sexes.
- Proteins are chains of amino acids (typically L-amino acids) whose alpha carbons are linked through peptide bonds formed by a condensation reaction between the carboxyl group ofthe alpha carbon of one amino acid and the amino group of the alpha carbon of another amino acid.
- the terminal amino acid at one end ofthe chain i.e., the amino terminal
- the terminal amino acid at the other end of the chain i.e., the carboxy terminal
- amino terminus refers to the free alpha-amino group on the amino acid at the amino terminal of the protein, or to the alpha-amino group (imino group when participating in a peptide bond) of an amino acid at any other location within the protein.
- carboxy terminus refers to the free carboxyl group on the amino acid at the carboxy terminus of a protein, or to the carboxyl group of an amino acid at any other location within the protein.
- amino acids making up a protein are numbered in order, starting at the amino terminal and increasing in the direction toward the carboxy terminal ofthe protein. Thus, when one amino acid is said to "follow" another, that amino acid is positioned closer to the carboxy terminal ofthe protein than the preceding amino acid.
- amino acid is used herein to refer to an amino acid (D or L) or an amino acid mimetic that is incorporated into a protein by an amide bond.
- the amino acid may be a naturally occurring amino acid or, unless otherwise limited, may encompass known analogs of natural amino acids that function in a manner similar to the naturally occurring amino acids (i.e., amino acid mimetics).
- an amide bond mimetic includes peptide backbone modifications well known to those skilled in the art.
- the peptides are relatively short in length (i.e., less than about 50 amino acids), they are often synthesized using standard chemical peptide synthesis techniques.
- Solid phase synthesis in which the C-terminal amino acid of the sequence is attached to an insoluble support followed by sequential addition of the remaining amino acids in the sequence is a preferred method for the chemical synthesis of the antigenic epitopes described herein. Techniques for solid phase synthesis are known to those skilled in the art.
- the antigenic epitopes described herein are synthesized using recombinant nucleic acid methodology.
- this involves creating a nucleic acid sequence that encodes the peptide or protein, placing the nucleic acid in an expression cassette under the control of a particular promoter, expressing the peptide or protein in a host, isolating the expressed peptide or protein and, if required, renaturing the peptide or protein.
- the protein fragments or peptides may be separated by a spacer molecule such as, for example, a peptide, consisting of one or more amino acids.
- a spacer molecule such as, for example, a peptide, consisting of one or more amino acids.
- the spacer will have no specific biological activity other than to join the desired protein fragments or peptides together, or to preserve some minimum distance or other spatial relationship between them.
- the constituent amino acids of the spacer may be selected to influence some property of the molecule such as the folding, net charge, or hydrophobicity.
- Nucleotide sequences encoding for the production of residues which may be useful in purification of the expressed recombinant protein may be built into the vector. Such sequences are known in the art. For example, a nucleotide sequence encoding for a poly histidine sequence may be added to a vector to facilitate purification ofthe expressed recombinant protein on a nickel column.
- recombinant peptides, polypeptides and proteins can be purified according to standard procedures known to one of ordinary skill in the art, including ammonium sulfate precipitation, affinity columns, column chromatography, gel electrophoresis and the like. Substantially pure compositions of about 50 to 99% homogeneity are preferred, and 80 to 95% or greater homogeneity are most preferred for use as therapeutic agents.
- the desired proteins, fragments thereof and peptides may possess a conformation substantially different than the native conformations of the proteins, fragments thereof and peptides. In this case, it is often necessary to denature and reduce protein and then to cause the protein to re-fold into the preferred conformation. Methods of reducing and denaturing proteins and inducing re-folding are well known to those of skill in the art.
- the genetic constracts ofthe present invention include coding sequences for different proteins, fragments thereof, and peptides.
- the genetic constructs also include epitopes or domains chosen to permit purification or detection of the expressed protein.
- Such epitopes or domains include DNA sequences encoding the glutathione binding domain from glutathione S-transferase, hexa- histidine, thioredoxin, hemagglutinin antigen, maltose binding protein, and others commonly known to one of skill in the art.
- the preferred genetic construct includes the nucleotide sequences of SEQ ID NO: 1 and SEQ ID NO: 3 or fragments or conservative substitutions thereof.
- nucleotide sequences may be included in the genetic constructs in order to encode for the following: a) multiple copies of the desired proteins, fragments thereof, or peptides; b) various combinations of the desired proteins, fragments thereof, or peptides; and c) conservative modifications of the desired proteins, fragments thereof, or peptides, and combinations thereof.
- Still another preferred protein of the present invention is human duox2 (SEQ ID NO: 2) protein, and fragments or conservative substitutions thereof, as encoded by SEQ ID NO: 1 and fragments or conservative substitutions thereof.
- Another preferred protein of the present invention is Ce Duox 1 (SEQ ID NO:4) protein and fragments or conservative substitutions thereof, as encoded by SEQ ID NO: 3 and fragments or conservative substitutions thereof.
- the nucleotide sequences of the present invention may also be employed to hybridize to nucleic acids such as DNA or RNA nucleotide sequences under high stringency conditions which permit detection, for example, of alternately spliced messages.
- the genetic construct is expressed in an expression system such as in NIH 3T3 cells using recombinant sequences in a pcDNA-3 vector (Invitrogen, Carlsbad, CA) to produce a recombinant protein.
- Preferred expression systems include but are not limited to
- Cos-7 cells insect cells using recombinant baculoviras, and yeast. It is to be understood that other expression systems known to one of skill in the art may be used for expression of the genetic constracts of the present invention.
- a preferred protein of the present invention is referred to herein as human duox2, or fragments or conservative substitutions thereof, which has the amino acid sequence set forth in SEQ ID NO: 2, or an amino acid sequence having amino acid substitutions as defined in the definitions that do not significantly alter the function of the recombinant protein in an adverse manner.
- Another preferred protein ofthe present invention is Ce Duox 1 (SEQ
- human duox2 refers to a protein comprising an amino acid sequence as set forth in SEQ ID NO:2, or a fragment or conservative substitution thereof, and encoded by the nucleotide sequence as set forth in SEQ ID NO: 1, or a fragment or conservative substitution thereof.
- Ce duox refers to duox from C. elegans or a fragment or conservative substitution thereof. Construction ofthe Recombinant Gene
- the desired gene is ligated into a transfer vector, such as pcDNA3, and the recombinants are used to transform host cells such as Cos-7 cells.
- a transfer vector such as pcDNA3
- the recombinants are used to transform host cells such as Cos-7 cells.
- transfer vectors, host cells, and transfection methods may be employed as commonly known to one of ordinary skill in the art.
- Two desired genes for use in transfection are shown in SEQ ID NO: 1, and SEQ ID NO: 3.
- lipofectamine-mediated transfection and in vivo homologous recombination is used to introduce the duoxl gene into NIH 3T3 cells.
- the synthetic gene is cloned and the recombinant construct containing duox gene is produced and grown in confluent monolayer cultures of a Cos-7 cell line.
- the expressed recombinant protein is then purified, preferably using affinity chromatography techniques, and its purity and specificity determined by known methods.
- a variety of expression systems may be employed for expression of the recombinant protein. Such expression methods include, but are not limited to the following: bacterial expression systems, including those utilizing E. coli and Bacillus subtilis; virus systems; yeast expression systems; cultured insect and mammalian cells; and other expression systems known to one of ordinary skill in the art.
- the vectors of the present invention may be transfected into any desired cell or cell line. Both in vivo and in vitro transfection of cells are contemplated as part of the present invention. Preferred cells for transfection include but are not limited to the following: fibroblasts (possibly to enhance wound healing and skin formation), granulocytes (possible benefit to increase function in a compromised immune system as seen in AIDS, and aplastic anemia), muscle cells, neuroblasts, stem cells, bone marrow cells, osteoblasts, B lymphocytes, and T lymphocytes.
- Cells may be transfected with a variety of methods known to one of ordinary skill in the art and include but are not limited to the following: electroporation, gene gun, calcium phosphate, lipofectamine, and fugene, as well as adenoviral transfection systems.
- SEQ ID NO: 2 and SEQ ID NO: 4 respectively, or fragments or conservative substitutions thereof.
- These expressed proteins are used to raise antibodies. These antibodies may be used for a variety of applications including but not limited to immunotherapy against cancers expressing one of the duox proteins, for affecting cuticle formation, and for detection, localization and measurement ofthe proteins shown in SEQ ID NO: 2 and SEQ ID NO: 4, or fragments or conservative substitutions thereof.
- the proteins of the present invention can be expressed as a fusion protein with a poly histidine component, such as a hexa histidine, and purified by binding to a metal affinity column using nickel or cobalt affinity matrices.
- the protein can also be expressed as a fusion protein with glutathione S-transferase and purified by affinity chromatography using a glutathione agarose matrix.
- the protein can also be purified by immunoaffinity chromatography by expressing it as a fusion protein, for example with hemagglutinin antigen.
- the expressed or naturally occurring protein can also be purified by conventional chromatographic and purification methods which include anion and cation exchange chromatography, gel exclusion chromatography, hydroxylapatite chromatography, dye binding chromatography, ammonium sulfate precipitation, precipitation in organic solvents or other techniques commonly known to one of skill in the art.
- proteins represented as SEQ ID NO: 2 and SEQ ID NO: 4 are available for assessing the activity of the expressed proteins of the present invention, including, but not limited to, the proteins represented as SEQ ID NO: 2 and SEQ ID NO: 4, substituted analogs thereof, and fragments or conservative substitutions thereof.
- the holoprotein may be expressed in COS-7 cells, NIH 3T3 cells, insect cells (using baculoviral technology) or other cells using methods known to one of skill in the art. Membrane fractions or purified protein are used for the assay.
- the assay may require or be augmented by other cellular proteins such as p47phox, p67phox, and Racl, as well as potentially other unidentified factors (e.g., kinases or other regulatory proteins).
- NADPH or NADH is used as the reducing substrate, in a concentration of about 100 ⁇ M.
- Reduction of cytochrome c is monitored spectrophotometrically by the increase in absorbance at 550 nm, assuming an extinction coefficient of 21 mM' ⁇ cm"!.
- the assay is performed in the absence and presence of about 10 ⁇ g superoxide dismutase.
- the superoxide-dependent reduction is defined as cytochrome c reduction in the absence of superoxide dismutase minus that in the presence of superoxide dismutase (Uhlinger et al. (1991) J. Biol. Chem. 266, 20990-20997).
- Acetylated cytochrome c may also be used, since the reduction of acetylated cytochrome c is thought to be exclusively via superoxide.
- NBT nitroblue tetrazolium
- cytochrome c cytochrome c
- about 1 mL of filtered 0.25 % nitrotetrazolium blue (Sigma, St. Louis, MO) is added in Hanks buffer without or with about 600 Units of superoxide dismutase (Sigma) and samples are incubated at approximately 37°C.
- the oxidized NBT is clear, while the reduced NBT is blue and insoluble.
- the insoluble product is collected by centrifugation, and the pellet is re-suspended in about 1 mL of pyridine (Sigma) and heated for about 10 minutes at 100°C to solubilize the reduced NBT.
- concentration of reduced NBT is determined by measuring the absorbance at 510 nm, using an extinction coefficient of 11 ,000 M" 1 cm" 1. Untreated wells are used to determine cell number.
- Superoxide generation may also be monitored with a chemiluminescence detection system utilizing lucigenin (bis-N- methylacridinium nitrate, Sigma, St. Louis, MO).
- lucigenin bis-N- methylacridinium nitrate, Sigma, St. Louis, MO
- the sample is mixed with about 100 ⁇ M NADPH (Sigma, St. Louis, MO) and 10 ⁇ M lucigenin (Sigma, St. Louis, MO) in a volume of about 150 ⁇ L
- Luminescence is monitored in a 96-well plate using a LumiCounter (Packard, Downers Grove, IL) for 0.5 second per reading at approximately 1 minute intervals for a total of about 5 minutes; the highest stable value in each data set is used for comparisons.
- LumiCounter Packard, Downers Grove, IL
- superoxide dismutase is added to some samples to prove that the luminescence arises from superoxide.
- a buffer blank is subtracted from each reading (Ushio-Fukai et al.
- Assays for superoxide generation may be performed using intact cells, for example, the duox-transfected NIH 3T3 cells.
- any of the above assays can be used to evaluate superoxide generation using intact cells, for example, the duox-transfected NIH
- NBT reduction is a preferred assay method.
- nucleotide sequences SEQ ID NO: 1 and SEQ ID NO: 3, as well as fragments or conservative substitutions thereof, and PCR primers therefor, may be used, respectively, for localization, detection and measurement of nucleic acids related to SEQ ID NO: 1 and SEQ ID NO: 3, as well as fragments or conservative substitutions thereof.
- SEQ ID NO 1 is also known as a nucleotide sequence encoding human duox2 in this application.
- SEQ ID NO: 3 is also known as a nucleotide sequence encoding Ce duox 1 in this application.
- nucleotide sequences SEQ ID NO: 1, SEQ ID NO: 3, as well as fragments or conservative substitutions thereof, may be used to create probes to isolate larger nucleotide sequences containing the nucleotide sequences SEQ ID NO: 1, SEQ ID NO: 3, respectively.
- the nucleotide sequences SEQ ID NO: 1, SEQ ID NO: 3, as well as fragments or conservative substitutions thereof, may also be used to create probes to identify and isolate duox proteins in other species.
- the nucleic acids described herein include messenger RNA coding for production of SEQ ID NO: 2, SEQ ID NO: 4, and fragments thereof.
- Such nucleic acids include but are not limited to cDNA probes. These probes may be labeled in a variety of ways known to one of ordinary skill in the art. Such methods include but are not limited to isotopic and non-isotopic labeling. These probes may be used for in situ hybridization for localization of nucleic acids such as mRNA encoding for SEQ ID NO: 2, and SEQ ID NO: 4, and fragments or conservative substitutions thereof. Localization may be performed using in situ hybridization at both ultrastractural and light microscopic levels of resolution using techniques known to one of ordinary skill in the art.
- probes may also be employed to detect and quantitate nucleic acids and mRNA levels using techniques known to one of ordinary skill in the art including but not limited to solution hybridization.
- SEQ ID NO: 31 and SEQ ID NO: 32 are combined with a pharmaceutically acceptable carrier or vehicle to produce a pharmaceutical composition and administered to animals for the production of polyclonal antibodies using methods known to one of ordinary skill in the art.
- the preferred animals for antibody production are rabbits and mice.
- Other animals may be employed for immunization with these proteins or fragments thereof.
- Such animals include, but are not limited to the following; sheep, horses, pigs, donkeys, cows, monkeys and rodents such as guinea pigs and rats.
- pharmaceutically acceptable carrier or pharmaceutically acceptable vehicle are used herein to mean any liquid including but not limited to water or saline, oil, gel, salve, solvent, diluent, fluid ointment base, liposome, micelle, giant micelle, and the like, which is suitable for use in contact with living animal or human tissue without causing adverse physiological responses, and which does not interact with the other components ofthe composition in a deleterious manner.
- compositions may conveniently be presented in unit dosage form and may be prepared by conventional pharmaceutical teclmiques. Such techniques include the step of bringing into association the active ingredient and the pharmaceutical carrier(s) or excipient(s). In general, the formulations are prepared by uniformly and intimately bringing into association the active ingredient with liquid carriers .
- Formulations suitable for parenteral administration include aqueous and non-aqueous sterile injection solutions which may contain anti-oxidants, buffers, bacteriostats and solutes which render the formulation isotonic with the blood of the intended recipient; and aqueous and non-aqueous sterile suspensions which may include suspending agents and thickening agents.
- the formulations may be presented in unit-dose or multi-dose containers, for example, sealed ampules and vials, and may be stored in a freeze- dried (lyophilized) condition requiring only the addition of the sterile liquid carrier, for example, water for injections, immediately prior to use.
- sterile liquid carrier for example, water for injections, immediately prior to use.
- Extemporaneous injection solutions and suspensions may be prepared from sterile powders, granules and tablets commonly used by one of ordinary skill in the art.
- Preferred unit dosage formulations are those containing a dose or unit, or an appropriate fraction thereof, of the administered ingredient. It should be understood that in addition to the ingredients, particularly mentioned above, the formulations of the present invention may include other agents commonly used by one of ordinary skill in the art.
- the pharmaceutical composition may be administered through different routes, such as oral, including buccal and sublingual, rectal, parenteral, aerosol, nasal, intramuscular, subcutaneous, intradermal, and topical.
- the pharmaceutical composition of the present invention may be administered in different forms, including but not limited to solutions, emulsions and suspensions, microspheres, particles, microparticles, nanoparticles, and liposomes. It is expected that from about 1 to 7 dosages may be required per immunization regimen.
- Initial injections may range from about 0.1 ⁇ g to 1 mg, with a preferred range of about 1 ⁇ g to 800 ⁇ g, and a more preferred range of from approximately 25 ⁇ g to 500 ⁇ g.
- Booster injections may range from 0.1 ⁇ g to 1 mg, with a preferred range of approximately 1 ⁇ g to 800 ⁇ g, and a more preferred range of about 10 ⁇ g to 500 ⁇ g.
- the volume of administration will vary depending on the route of administration and the size ofthe recipient.
- intramuscular injections may range from about 0.1 ml to 1.0 ml.
- the pharmaceutical composition may be stored at temperatures of from about 4°C to -100°C.
- the pharmaceutical composition may also be stored in a lyophilized state at different temperatures including room temperature.
- the pharmaceutical composition may be sterilized through conventional means known to one of ordinary skill in the art. Such means include, but are not limited to filtration, radiation and heat.
- the pharmaceutical composition of the present invention may also be combined with bacteriostatic agents, such as thi erosal, to inhibit bacterial growth.
- adjuvants may be administered in conjunction with the protein in the pharmaceutical composition.
- adjuvants include, but are not limited to the following: polymers, co-polymers such as polyoxyethylene-polyoxypropylene copolymers, including block copolymers; polymer P1005; Freund's complete adjuvant (for animals); Freund's incomplete adjuvant; sorbitan monooleate; squalene; CRL- 8300 adjuvant; alum; QS 21, muramyl dipeptide; trehalose; bacterial extracts, including mycobacterial extracts; detoxified endotoxins; membrane lipids; or combinations thereof.
- Monoclonal antibodies can be produced using hybridoma technology in accordance with methods well known to those skilled in the art.
- the antibodies are useful as research or diagnostic reagents or can be used for passive immunization.
- the composition may optionally contain an adjuvant.
- the polyclonal and monoclonal antibodies useful as research or diagnostic reagents may be employed for detection and measurement of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 31 and SEQ ID NO: 32, and fragments or conservative substitutions thereof.
- Such antibodies may be used to detect these proteins in a biological sample, including but not limited to samples such as cells, cellular extracts, tissues, tissue extracts, biopsies, tumors, and biological fluids.
- Such detection capability is useful for detection of disease related to these proteins to facilitate diagnosis and prognosis and to suggest possible treatment alternatives. Detection may be achieved through the use of immunocytochemistry, ELISA, radioimmunoassay or other assays as commonly known to one of ordinary skill in the art.
- duox proteins including the hduox2 and Ce-duox proteins of the present invention, or fragments or conservative substitutions thereof, may be labeled through commonly known approaches, including but not limited to the following: radiolabeling, dyes, magnetic particles, biotin-avidin, fluorescent molecules, chemiluminescent molecules and systems, ferritin, colloidal gold, and other methods known to one of skill in the art of labeling proteins.
- the antibodies directed to the proteins shown as SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 31, SEQ ID NO: 32 , or directed to fragments or conservative substitutions thereof, may also be administered directly to humans and animals in a passive immunization paradigm.
- Antibodies directed to extracellular portions of SEQ ID NO: 2, and SEQ ID NO: 4, bind to these extracellular epitopes. Attachment of labels to these antibodies facilitates localization and visualization of sites of binding. Attachment of molecules such as ricin or other cytotoxins to these antibodies helps to selectively damage or kill cells expressing SEQ ID NO: 2, and SEQ ID NO: 4, or fragments thereof.
- Kits may be used for immunocytochemistry, in situ hybridization, solution hybridization, radioimmunoassay, ELISA, Western blots, quantitative PCR, and other assays for the detection, localization and measurement of these nucleic acids, proteins or fragments thereof using teclmiques known to one of skill in the art.
- the nucleotide sequences shown in SEQ ID NO: 1, and SEQ ID NO: 3, or fragments thereof, may also be used under high stringency conditions to detect alternately spliced messages related to SEQ ID NO: 1, and SEQ ID NO: 3, or fragments thereof, respectively.
- the diagnostic kits may measure or detect the relative expression of the duox proteins described herein (i.e. human duoxl and/or human duox2 and ce-duox).
- Fragments of SEQ ID NO: 1, and SEQ ID NO: 3, containing the relevant hybridizing sequence can be synthesized onto the surface of a chip array.
- RNA samples e.g., from tumors, are then fluorescently tagged and hybridized onto the chip for detection.
- This approach may be used diagnostically to characterize tumor types and to tailor treatments and/or provide prognostic information.
- prognostic information may have predictive value concerning disease progression and life span, and may also affect choice of therapy.
- a 535-base portion of an expressed sequence tag (EST zc92h03.rl; Genbank accession no. W52750) from human pancreatic islet was identified using the amino-acid sequence of human gp9lphox as a query in a Blast search.
- the bacterial strain #595758 containing the EST sequence zc92h03.rl in the pBluescript SK-vector was purchased from ATCC (Rockville, MD). The DNA was sequenced using primers to T7 and T3 vector promoters as well as sequence-specific internal primers.
- 5'- and 3'- RACE were carried out using human adult pancreas mRNA (Clontech, Palo Alto, CA) with the 5' RACE kit for Rapid Amplification of cDNA Ends version 2.0 (Gibco BRL, Gaithersburg,
- PCR was done with specific primers: 5'-RACE: Primer 1, 5'- GAAGTGGTGGGAGGCGAAGACATA-3' (SEQ ID NO: 5); Primer 2, 5'-CCTGTCATACCTGGGACGGTCTGG-3' (SEQ ID NO:6); Primer 3, 5'-GAGCACAGTGAGATGCCTGTTCAG-3' (SEQ ID NO:7); Primer 4, 5'-GGAAGGCAGCAGAGAGCAATGATG-3'
- the cDNA for h-Duox2 showed a 4647 base pair open reading frame (Genebank #AF267981) that is predicted to encode a protein of 1548 amino acids (175 kDa), and contained a consensus Kozak sequence, GGCATGC (SEQ ID NO: 13), at the translation start codon.
- the Duox2 cDNA sequence is a larger form of a gp9lphox homolog previously identified as an NADPH-oxidase in thyroid and termed pl38 Tox ; the latter sequence did not contain the a peroxidase homology domain (Dupuy et al., 1999).
- h-Duoxl and h- Duox2 were 77% identical at the amino acid level.
- a BLAST search using the cDNA sequence of human gp9lphox identified two putative homologues (Genbank #s AF043697 and AF003130) in the genomic sequence of C. elegans, both near the end of chromosome I and separated by ⁇ 6 Kb. Based on the gene sequence, PCR primers were designed to amplify two overlapping portions ofthe Ce-Duoxl gene, one extending from the 5' end and one extending from the 3' end. Primers were 5'- ATTCGTCGACAAATGCGCTCAAAACATGTGCTGT-3' (SEQ ID
- PCR was carried out using a random primed C. elegans cDNA library in 1ACT (obtained from R. Barstead, Oklahoma Medical Research Foundation) under the following conditions: denaturation at 95°C for 30 seconds; annealing at 59°C for 30 seconds; extension at 72°C for 1 minute.
- the 5' piece and the 3' piece were digested with Dra III and ligated to produce the full length Ce-Duoxl cDNA.
- the full length Ce-Duoxl cDNA was inserted into the pBluescript SK-vector and was sequenced using T7 and T3 vector primers and sequence specific primers.
- Duox homologs in C. elegans A BLAST search of the C. elegans genomic database using as a query the protein sequence of gp91phox identified two homologous genes contained in cosmids F56C11 and F53G12.
- the Ce-Duoxl conceptual transcript (Genebank # AF043697) is predicted to be 8197 bp before splicing, to contain 19 exons, and to encode a protein of 1506 amino acids.
- Ce-Duoxl Cloning of the cDNA for Ce-Duoxl (Genebank #AF229855) revealed a cDNA of 4491 bp (1497 amino acids), which differed somewhat from the conceptual cDNA obtained from the gene structure due to inaccuracies in the predicted intron-exon junctions.
- the second transcript, Ce-Duox2 (Genebank #AF043697) is predicted to be 5308 bp before splicing, to contain 16 exons, and to encode a 1313 amino acid protein.
- Ce-Duox2 contains a stop codon which should eliminate the extreme C-terminal portion of the protein, which includes a segment of the pyridine nucleotide binding site.
- Ce-Duox2 should contain intact peroxidase and calmodulin-like domains, it is not predicted to encode a functioning NADPH-oxidase domain (see Fig. 1).
- Ce-Duox2 is 94% identical to Ce-Duoxl at the amino acid level. Both Ce-Duoxl and Ce-Duox2 are located near the end of chromosome I, separated by only 6 kb and in opposite orientations. The high degree of sequence identity and retention of intron structure (data not shown), as well as the location of both near the end of a chromosome are consistent with a recent gene duplication.
- Fig. 1 The domain stracture and transmembrane regions in gp91phox, h-Duoxl, hDuox2, Ce-Duoxl and Ce-Duox2 are diagrammed in Fig. 1.
- Duox enzymes are homologous to gp9lphox in their C-termini (see http://www.biochem.emory.edu/Lambeth/gp91_homology.pdf for an alignment of these regions).
- Noxl (Suh et al., 1999), which is the same size as gp9lphox, is more closely related to gp91phox (54 % identical) than is the NADPH-oxidase domain of hDuoxl or hDuox2 ( ⁇ 26 % identical to gp91phox).
- h-Duoxl and hDuox2 are more closely related to Ce-Duoxl within the NADPH-oxidase domain ( ⁇ 39 % identical).
- homologs share considerably higher homology, ranging from 60% to 90%>, depending on the region.
- GXGXXP canonical dinucleotide binding helix GXGXXP
- Duox proteins have additional regions that are not present in gp9lphox.
- a central region contains two EF hand calcium binding sequences, as indicated in Fig. 1.
- the canonical residues involved in calcium ligation are well conserved in h-Duoxl and h-Duox2, but are poorly conserved in Ce-Duoxl and Ce-Duox2, suggesting that the function of this region may have evolved away from calcium binding in nematodes.
- the N-terminal third of Duox proteins is homologous to peroxidases including myeloperoxidase, eosinophil peroxidase, thyroid peroxidase, lactoperoxidase and sea urchin ovoperoxidases (Fig. 2A and 2B).
- peroxidases including myeloperoxidase, eosinophil peroxidase, thyroid peroxidase, lactoperoxidase and sea urchin ovoperoxidases (Fig. 2A and 2B).
- the Duox enzymes represent a distinct group within the peroxidase family (Fig. 2B), and phylogenetically, this group is marginally more closely related to sea urchin ovoperoxidases.
- the extreme N-terminal 21 amino acids of Ce-Duoxl contains a secretory signal peptide sequence (Fig. 1), implying that the N- terminal peroxidase domain is in a compartment that is transmembrane to the cytosol (e.g., extracellular or within a secretory vesicle).
- Fig. 1 secretory signal peptide sequence
- hydropathy plots reveal that the proteins contain a highly hydrophobic region corresponding to the N-terminal third of gp9lphox. This region can be modelled as a cluster of 6 transmembrane alpha helices, as indicated in Fig. 1.
- An additional transmembrane helical region is present between the peroxidase homology domain and the calmodulin-like domain.
- PCR conditions were: 95°C for 30 s, 65°C for 20 s, 72°C for 30 s, 35 cycles.
- h-Duoxl mRNA was distributed among a variety of adult tissues, with highest expression in lung and thyroid, but with significant expression also seen in placenta, testis, and prostate with detectable expression in pancreas and heart.
- h-Duoxl mRNA was also widely expressed in fetal tissues, where it was abundant in lung.
- h-Duox2 mRNA was distributed among a variety of adult tissues, with highest expression in colon, testis, pancreas and thyroid. h-Duox2mRNA was also widely expressed in fetal tissues, where it was abundant in lung, liver, kidney, and heart, and thyroid. We also observed significant expression in fetal skeletal muscle and thymus.
- RNAi RNA interference
- RNA interference RNA interference
- This technique involves injection of double stranded RNA (dsRNA) encoding a segment of Ce-Duoxl or Ce-Duox2 into gonads of C. elegans wild type hermaphrodites. Injected animals were then allowed to lay eggs, the harvested eggs were allowed to develop, and the progeny were observed for phenotypes. This procedure specifically diminishes or eliminates the expression ofthe gene of interest.
- dsRNA double stranded RNA
- Exon 10 of Ce-Duox2 was amplified by PCR from genomic DNA using the forward primer 5'- GCTAGAGCTCTTCAGTTTGCTATGGAATTGGC-3' (SEQ ID NO:23) and reverse primer 5'-
- dsRNA double stranded RNA
- Phenotypes ofC. elegans RNAi Ce-Duox animals dsRNA corresponding to three distinct regions of Ce-Duoxl and Duox2 were used in separate experiments. The first two correspond to regions of identity between Ce-Duoxl and Ce-Duox2 and are predicted to block the expression of both forms of Duox. The third dsRNA corresponds to the extreme C-terminus of Ce-Duoxl, which does not have a counterpart in Ce-Duox2, and therefore blocks only the expression of Ce-Duoxl . All three dsRNA forms resulted in the same range of phenotypes.
- RNAi animals exhibiting any given phenotype were somewhat variable, probably due to differences in amount of RNAi or site of injection. However, in a typical experiment, greater than 90%> of the animals were affected by one or more phenotypes. In a typical experiment, phenotypes included the presence of large superficial blisters ( ⁇ 50%> of animals) and short or “dumpy" animals (-35% of animals), and animals with retained eggs or larvae (not shown). In addition, while wild type animals showed a dark appearance, more than 80% of RNAi animals were translucent.
- RNAi animals showed an inability to move on plates in a normal serpentine manner: affected animals were either completely paralyzed or moved only the anterior region, clearing a localized swath of E. coli in the vicinity of the head. Similar phenotypes in C. elegans have been described previously and are associated with mutations in the collagen biosynthetic pathway (Levy et al., 1993; Kramer, 1997; Johnstone, 2000).
- Ce-Duoxl was expressed at low levels (consistent with its exclusive expression in hypodermal cells) in a stage-specific manner. Expression occurred in a cyclic pattern peaking during the embryonic stage and at 36 hours, corresponding to the peak expression of other genes (Johnstone, I.L., 2000) related to collagen/cuticle biosynthesis (col-14, dpy-2,-7,-10, and sqt-3).
- a second set of collagen/cuticle-related genes (bli-1,-2, col-2,-6,-17,-35,-36,-37,-41, dyp-13, sqt-1, and rol-6,-8) also show peak expression at 36 hours. No significant expression of Ce-Duox2 was seen at any stage. Thus, these data are consistent with a function of Ce-Duoxl in cuticle biogenesis.
- pPD96.62 was expected to have driven both n -galactosidase and green fluorescent protein (GFP) expression, no fluorescence was observed outside of body wall muscle (the site of expression of the marker Myo-3-GFP).
- pPD96.62PRODuoxlB was prepared as follows: a 3389 bp fragment was amplified by long range PCR from C. elegans genomic DNA using the forward primer 5'-
- the fragment included the start methionine of Ce-Duoxl and 5' untranslated sequence.
- the fragment was digested with Hindlll and BamHI and then subcloned into pPD96.62. This construct results in the Ce-Duoxl promoter region (3389 bp) and the start methionine being inserted 5' of E. coli lacZ gene fused to the green fluorescence protein (GFP) reported gene.
- GFP green fluorescence protein
- Staining was used to detect expression of the gfp:lacZ fusion protein in transgenic worms carrying pPD96.62PRODuoxlB.
- Vectors also incorporated a nuclear localization peptide at the N-terminus of ⁇ -galactosidase. This allows predominant staining in the nuclei of expressing cells and facilitates their identification.
- Nematodes were placed into individual wells of an eight well microscope slide with -15 ⁇ l of distilled water and dried under vacuum for 2-3 min. Acetone was continuously dripped onto the dried animals for 2 min. The slide was placed in an uncovered humidity chamber, but kept dry. 10 ⁇ l of ⁇ -galactosidase stain (Fire, 1993) was layered onto each well as soon as the acetone had completely evaporated and the lid to the humidity chamber was replaced. The nematodes were then incubated at room temperature for several hours, washed several items in phosphate buffered saline, and then observed with a compound microscope.
- Ce-Duoxl Cellular expression of Ce-Duoxl
- the cellular location of Ce-Duoxl in C. elegans was determined by double staining with antibodies to Ce-Duoxl and to myosin A (a marker for body wall muscle cells).
- Ce-Duoxl was seen in larval animals in the hypodermal layer of cells immediately overlying the myosin A-containing muscle cells, and was only faintly detectable in hypodermal cells that did not overlie muscle quadrants. In adult animals, Ce-Duoxl was poorly detected (not shown). The strong signal seen in larval animals was eliminated using anti-Ce- Duoxl antibody that had been preincubated with Ce-Duoxl peptide.
- Nematodes were washed with M9 buffer, suspended in 0.5 ml sonication buffer (10 mM Tris HCl, pH 7.4, 1 mM EDTA, 1 mM phenylmethanesulfonyl fluoride), and sonicated 4 x 20 s. Protein was determined with the Bradford assay using bovine serum albumin as a standard. 10 ⁇ g of whole animal extract was loaded onto a 10% SDS- page gel which was then transferred to Immobilon-P membrane (Millipore). The blot was blocked for 1 hour in a solution of 5% nonfat powdered milk and 0.05% Tween in PBS.
- the antibody to Ce- Duoxl was added in a 1 to 2000 dilution, incubated overnight, and the membrane was washed 3 times for 15 min with blocking solution. The blot was then developed using the SuperSignal Chemiluminescent Kit from Pierce (Rockford, IL). A western blot of C. elegans protein extract showed a single band with a molecular weight of -180,000 (data not shown).
- Dityrosine standard was synthesized and purified as in Abdelrahim et al., 1997 with minor modifications. Reaction products were dissolved in acidified methanol, were filtered, and directly applied to the CP-11 cellulose phosphate, eliminating the rotary evaporation step. Samples with absorption properties characteristic of dityrosine were pooled and freeze dried. For mass spectrometry, the 1 ml of dityrosine standard (0.77 mg/ml) was added to 1 ml of methanoLwater (1:1) in 0.1% acetic acid.
- Nematodes were washed with M9 buffer, suspended in 0.5 ml sonication buffer (10 mM Tris HCl, pH 7.4, 1 mM EDTA, 1 mM phenylmethanesulfonyl fluoride), and sonicated 4 x 20 s. Protein was determined with the Bradford assay using bovine serum albumin as a standard. Whole worm extracts were lyophilized and resuspended in 6 N HCl.
- HPLC purified samples of dityrosine and trityrosine from both C. elegans extracts and peroxidase domain cross-linking reactions were lyophilized and resolubilized in either 0.1 M HCl (3 ml) or 0.1 M NaOH (3 ml). Fluorescence excitation and emission spectra were obtained with a Perkin-Elmer LS-5B Luminescence Spectrometer.
- Mass spectrometry was preformed on a PE sciex API 3000 triple quadrupole mass spectrometer equipped with a turboionspray source.
- Dried dityrosine standard (20 mg) was reconstituted in 200 ⁇ l of H 2 O.
- a 50 ⁇ l aliquot of this was diluted to a final volume of 1 ml with 950 ⁇ l of 5 mM ammonium acetate in MeOH and 1% acetic acid.
- Standard and total protein acid hydrolysate from C. elegans were analyzed by reverse phase LC-MS/MS.
- a 50 ⁇ l volume of sample was injected onto a 15 cm x 2.1 mm Supelco Discovery C18 column at a flow rate of 300 ⁇ l min "1 .
- Solvent A was 99: 1 H 2 O/acetic acid and solvent B was 99:1 MeOH/acetic acid both containing 5mM ammonium acetate.
- the column was directly infused into the ion source of the mass spectrometer operating in positive ion mode. The column was pre-equilibrated with 100% A for 6 min followed by sample injection.
- the transitions monitored were the neutral loss of a carboxyl groups, the neutral loss of a carboxyl group and one amino group, the neutral loss of two C-termini, and the neutral loss of two carboxyl groups and two amino groups (m/z 494.3, 477.2, 448.2, and 431.2 respectively).
- elegans revealed a first large peak which was identified as dityrosine based on comparison with authentic standard and mass spectral analysis, and the second peak is identified as trityrosine based on its migration on HPLC relative to dityrosine and mass spectral analysis. Based on peak areas and assuming equivalent ionization, dityrosine and tyrosine were present in a ratio of 1 :200 in adult wild-type animals. In addition, the fluorescence excitation/emission maxima were determined at alkaline and acidic pH and were in good agreement with previously reported values (Jacob, et al. 1996). Neither the dityrosine nor the trityrosine peaks were detected in hydrolysates of Ce-Duox RNAi nematodes.
- Wild type or RNAi blistered adult C. elegans were collected and washed first with M9 buffer and then with 0.1 M cacodylate buffer (pH 7.4). Animals were pelleted, added to 1 ml of 0.8% glutaraldeyde, 0.7% osmium tetroxide, 0.1 M cacodylate pH 7.4 and incubated on ice for 1.5 hours with occasional mixing. The animals were washed with 0.1 M cacodylate buffer, transferred to a glass depression slide and cut in half with a 23 gauge needle.
- Bisected animals were transferred into a tube containing 1 ml of fresh fixative (0.8% glutaraldehyde, 0.7% osmium tetroxide, 0.1 M cacodylate pH 7.4) and incubated on ice for 2 hrs. After washing with 0.1 M cacodylate buffer, the bisected animals were fixed overnight on ice in 1% osmium tetroxide in 0.1 M cacodylate buffer. Animals were washed several times in 0.1 M cacodylate buffer, dehydrated using graded alcohols through propylene oxide, infiltrated and embedded in Embed-812 (Electron Microscopy Sciences, Ft. Washington, PA).
- the animals were teased into parallel arrangement with an eyelash probe prior to polymerization at 60°C for 16 hours. Sections (0.5 mm) were evaluated for orientation and ultrasections (800 A thick) were collected on 200 mesh copper grids, stained with uranyl acetate and lead citrate, and cross sections were examined with a Philips EM201 electron microscope.
- RNAi Duox animals were grossly abnormal. In normal animals three cuticle layers were seen clearly: the cortical (outer), median and basal (inner) layer, as described previously (Cox, G.N., et al, 1981).
- the median layer is composed of struts connecting the cortical and basal layers, with a fluid-filled space between these layers.
- the RNAi animals frequently showed separation between the cortical and the basal layers, with marked expansion of the fluid cavity and broken and distended struts that were still visible on these layers. These separations occurred mainly over bundles of muscle fiber and are likely to account for the formation of the blisters observed using light microscopy. Thus, the cuticle stracture was severely affected in RNAi Duox animals.
- the polymerase chain reaction was used to amplify the peroxidase domains of h-Duox (amino acid residues 1-593, SEQ ID NO:
- Duox peroxidase domains A 0.5 ml LB overnight culture of cells containing plasmid with the peroxidase domain from h-Duox or Ce-Duox was used to inoculate 50 ml of modified TB medium (Sandhu et al, 1993) containing 0.5 mM d-aminolevulinic acid, 100 mg/ml ampicillin and 25 mg/ml chloramphenicol in a 250 ml flask. Bacteria were grown at
- the peroxidase domains of Ce-Duox (residues 1-590, SEQ ID NO:32) and h-Duoxl (residues 1-593, SEQ ID NO:31) were expressed in E. coli, as described above. A lysate from these cells was analyzed for peroxidase activity. The results showed that the lysates from E. coli, expressing both the human and the C. elegans peroxidase-homology domains from Duox, demonstrated peroxidase activity towards TMB, a well-characterized peroxidase substrate. The activity was inhibited by the peroxidase inhibitor aminobenzohydrazide. Lysates from E.
- TMB 3,3',5,5'-tetramethylbenzidine
- tyrosine ethyl ester (20 mM) was dissolved in 10 ml of PBS buffer supplemented with 80 ml of 3% H 2 O 2 . To 1 ml aliquots, 100 mg of E. coli lysate protein was added, samples were incubated for 1 hour, and the reaction was quenched using an equal volume of 12 M HCl. Samples were analyzed for di- and tri-tyrosine as above.
- NIH 3T3 cells stably transfected with the human duox2 gene are analyzed for superoxide generation using the lucigenin (Bis-N- methylacridinium luminescence assay (Sigma, St. Louis, MO, Li et al. (1998) J. Biol. Chem. 273, 2015-2023).
- lucigenin Bis-N- methylacridinium luminescence assay (Sigma, St. Louis, MO, Li et al. (1998) J. Biol. Chem. 273, 2015-2023).
- Cells are washed with cold HANKS' solution and homogenized on ice in HANKS' buffer containing 15% sucrose using a Dounce homogenizer. Cell lysates are frozen immediately in a dry ice/ethanol bath.
- Luminescence is monitored using a LumiCounter (Packard) at three successive one minute intervals and the highest value is used for comparison. Protein concentration is determined by the Bradford method.
- cells that are stably transfected with hduox2 (YA28) or with empty vector (NEF2) are grown in 10 cm tissue culture plates in medium containing DMEM, 10% calf serum, 100 units/ml penicillin, 100 ⁇ g/ml streptomycin, and 1 ⁇ g/ml puromycin to approximately 80% confluency.
- Cells (five tissue culture plates of each cell type) are washed briefly with 5 ml phosphate buffered saline (PBS) then dissociated from the plates with PBS containing 5 mM EDTA. Cells are pelleted by centrifuging briefly at 1000 x g.
- PBS phosphate buffered saline
- freeze thaw lysis is carried out followed by passage of the cell material through a small bore needle. The supernatant is removed and the cells frozen on dry ice for 15 minutes. After cells thaw, 200 ⁇ l lysis buffer (HANKS' Buffered Salt Solution - HBBS) containing a mixture of protease inhibitors from Sigma (Catalog # P2714) is added. Cells on ice are passed through an lysis buffer (HANKS' Buffered Salt Solution - HBBS) containing a mixture of protease inhibitors from Sigma (Catalog # P2714) is added. Cells on ice are passed through an lysis buffer (HANKS' Buffered Salt Solution - HBBS) containing a mixture of protease inhibitors from Sigma (Catalog # P2714) is added. Cells on ice are passed through an lysis buffer (HANKS' Buffered Salt Solution - HBBS) containing a mixture of protease inhibitors from Sigma (Catalog # P2714)
- the cell lysates are assayed for protein concentration using the BioRad protein assay system.
- Cell lysates are assayed for NADPH-dependent chemiluminescence by combining HBSS buffer, arachidonic acid, and 0.01 - 1 ⁇ g protein in assay plates (96 well plastic plates).
- the reaction is initiated by adding 1.5 mM NADPH and 75 ⁇ M lucigenin to the assay mix to give a final concentration of 200 ⁇ M NADPH and 10 ⁇ M lucigenin, and the chemiluminescence is monitored immediately.
- the final assay volume is about 150 ⁇ l.
- the optimal arachidonic acid concentration is between about 50-100 ⁇ M.
- a Packard Lumicount luminometer is used to measure chemiluminescence of the reaction between lucigenin and superoxide at 37°C. The plate is monitored continuously for 60 minutes and the maximal relative luminescence unit (RLU) value for each sample is plotted. Results show that the presence of NaCl or KCl within a concentration range of 50-150 ⁇ M is important for optimal activity.
- T is cell-free assay for duox2 NADPH-oxidase activity is useful for screening modulators (inhibitors or stimulators) of the duox2 enzyme.
- the assay may also be used to detect and duox NADPH-oxidase activity in general and to screen for modulators (inhibitors or stimulators) of the duox family of enzymes.
- NEF2 vector alone control
- YA26 dueox2 (SEQ ID NO:l)-transfected
- YA28 dueox2 (SEQ ID NO:l)-transfected
- NBT Nitro blue tetrazolium
- Sigma Nitro blue tetrazolium
- pyridine pyridine
- concentration of reduced NBT is determined by measuring the absorbance at 510 nm, using an extinction coefficient of 11,000 M"lcm"l.
- duox2 SEQ ID NO:l
- the data indicate that the duox2 (SEQ ID NO:l)- transfected cells generated significant quantities of superoxide. Because superoxide dismutase is not likely to penetrate cells, superoxide must be generated extracellularly. The amount of superoxide generated by these cells is about 5-10% of that generated by activated human neutrophils.
- EXAMPLE 14 Modification of Intracellular Components in Duox2 Transfected Cells To test whether superoxide generated by duox2 can affect intracellular "targets", aconitase activity in control and duox- transfected cell lines is monitored using methods as described in Suh et al. (1999) Nature 401, 79-82.
- Aconitase contains a four-iron- sulphur cluster that is highly susceptible to modification by superoxide, resulting in a loss of activity, and has been used as a reporter of intra-cellular superoxide generation.
- Acotinase activity is determined as described in Gardner et al. (1995) J. Biol. Chem. 270, 13399-13405.
- Acotinase activity is significantly diminished in all three duox-transfected cell lines designated YA26, YA28 and YA212 as compared to the transfected control.
- Approximately 50% of the aconitase in these cells is mitochondrial, based on differential centrifugation, and the cytosolic and mitochondrial forms are both affected. Control cytosolic and mitochondrial enzymes that do not contain iron-sulfur centres are not affected.
- Superoxide generated in duox2-transfected cells is therefore capable of reacting with and modifying intracellular components.
- EXAMPLE 15 Tumor Generation in Nude Mice Receiving Cells Transfected with the Human duox2 cDNA (SEQ ID NO: 1) About 2 x 10 6 NIH 3T3 cells (either hduox2- transfected with SEQ ID NO:l or cells transfected using empty vector) are injected subdermally into the lateral aspect of the neck of 4-5 week old nude mice. Three to six mice are injected for each of three duoxl -transfected cell lines, and 3 mice are injected with the cells transfected with empty vector (control). After 2 to 3 weeks, mice are sacrificed. The tumors are fixed in 10% formalin and characterized by histological analysis.
- Tumors averaged 1.5 x 1 x 1 cm in size and show histology typical of sarcoma type tumors. In addition, tumors appear to be highly vascularized with superficial capillaries. Eleven of twelve mice injected with duox2 gene- transfected cells develop tumors, while none of the three control animals develop tumors.
- mice are injected with duox2- transfected NIH 3T3 cells.
- 14 show large tumors within 17 days of injection, and tumors show expression of duoxl mRNA. Histologically, the tumors resemble fibrosarcomas and are similar to ras-induced tumors.
- ras and duox2 are similarly potent in their ability to induce tumorigenicity of NIH 3T3 cells in athymic mice.
- a role in normal growth is demonstrated in rat aortic vascular smooth-muscle cells by using antisense to rat duox2.
- Transfection with the antisense DNA results in a decrease in both superoxide generation and serum-dependent growth.
- Duox2 is therefore implicated in normal growth in this cell type.
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Inventor name: EDENS, WILLIAM, A. Inventor name: BENIAN, GUY Inventor name: SHARLING, LISA Inventor name: CHENG, GUANGIJIE Inventor name: ARNOLD, REBECCA, S. Inventor name: GRIENDLING, KATHY, K. Inventor name: LASSEGUE, BERNARD, P. Inventor name: LAMBETH, J., DAVID |
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