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  • A61K31/195—Carboxylic acids, e.g. valproic acid having an amino group
  • A61K31/197—Carboxylic acids, e.g. valproic acid having an amino group the amino and the carboxyl groups being attached to the same acyclic carbon chain, e.g. gamma-aminobutyric acid [GABA], beta-alanine, epsilon-aminocaproic acid or pantothenic acid
  • A61K31/198—Alpha-amino acids, e.g. alanine or edetic acid [EDTA]
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  • A61K31/403—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil condensed with carbocyclic rings, e.g. carbazole
  • A61K31/404—Indoles, e.g. pindolol
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  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
  • A61K31/4164—1,3-Diazoles
  • A61K31/417—Imidazole-alkylamines, e.g. histamine, phentolamine
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• • A—HUMAN NECESSITIES
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  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
  • A61P31/14—Antivirals for RNA viruses
• • A—HUMAN NECESSITIES
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  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
  • A61P31/14—Antivirals for RNA viruses
  • A61P31/18—Antivirals for RNA viruses for HIV
• • A—HUMAN NECESSITIES
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  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
  • A61P31/20—Antivirals for DNA viruses
  • A61P31/22—Antivirals for DNA viruses for herpes viruses
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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  • A61P35/00—Antineoplastic agents
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  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00

Definitions

• the invention relates to the use of nordihydroguaiaretic acid derivatives, in particular derivatives containing substituents of naturally occuring amino acids, for the treatment of tumors and viral infections.
• Carcinogenesis is a multistage event affected by a variety of genetic and epigenetic factors and is typified by the outbreak of uncontrolled cell growth originated from different tissues.
• a universal goal for anticancer research lies in the development of a clinical treatment that is highly effective in curtailment of tumor growth, non-toxic to the host, and is affordable for most patients.
• Drugs that focus on the inhibition of targets that are unique to dividing cells should be effective chemofherapeutic agents without the risk of substantial side effects.
• Cells pass through many checkpoints as they proceed through the cell cycle. Certain criteria must be met in order to pass each of these checkpoints. In the G2/M transition, the most essential regulator is the cyclin- dependent kinase CDC2.
• This kinase binds tightly to the regulatory protein cyclin B, and this complex, also called the maturation promoting factor (MPF), is responsible for stimulating a myriad of events that lead to the cell's entry into early prophase (1).- Not surprisingly, the loss or deactivation of either component ofthe MPF will block cellular progression out of G2.
• the expression and activity ofthe MPF is regulated at different levels. Cyclin B protein levels slowly rise through the Gl and S phases ofthe cell cycle, peak during the G2 to M phase transition, and drop sharply during mitosis (2).
• the CDC2 protein on the other hand, is always present during the cell cycle, although levels rise slightly in the last stages ofthe G2 phase (3).
• the activity ofthe protein is dependent on the association with the appropriate cyclin, as well as on the dephosphorylation of its inhibitory sites by the phosphatase CDC25C (4,5). It has been shown that the failure of this dephosphorylation initiates G2 arrest in response to DNA damage by radiation or chemical action. Recent evidence also suggests that any remaining active CDC2 may be transported outside the nucleus following DNA damage (6).
• NDGA plant lignan nordihydroguaiaretic acid
• HPV infection Human papillomavirus (HPV) infection causes unregulated cell growth in many types of squamous epithelial cells, resulting in afflictions ranging from benign pallilomae (warts) to cervical, penile and mouth cancer.
• benign pallilomae warts
• cervical, penile and mouth cancer The strong association of these cancers with HPV and the widespread occurrence of infection denotes the importance of developing an anti HPV therapy.
• viruses including those replicatively active mutants, are host dependent. They require the participation of certain cellular factors for supporting viral growth. Host cellular factors, unlike viral proteins, are not under mutational pressure and are in general, structurally invariable. Thus, compounds that block the usage of these cellular factors at different stages of the viral life cycle are likely to be good candidates as mutation insensitive antiviral drugs.
• cellular factors unlike viral proteins, are not under mutational pressure and are in general, structurally invariable. Thus, compounds that block the usage of these cellular factors at different stages of the viral life cycle are likely to be good candidates as mutation insensitive antiviral drugs.
• NDGA 3'-0 -methylated NDGA (i.e. Mai .4), isolated from Creosote bush (Larrea tridentata) can specifically block basal HIV transcription, Tat-regulated transactivation, and HIV replication in human cell culture(8, 12, 13).
• Mal.4 exerts its effects by interfering with the binding of transcription factor Spl to the promoter ofthe HIV pro viral template.
• the target of Mal.4 is mapped to nucleotides -87 to -40, the Spl binding sites of the HIV long terminal repeat (LTR).
• LTR HIV long terminal repeat
• Survivin is an inhibitor of apoptosis that is abundantly expressed in many human cancers (35), but not in normal adult human tissue, and is considered a possible modulator ofthe terminal effector phase of cell death/survival. (36). Survivin is expressed in G 2 -M in a cell cycle-dependent manner, binding directly to mitotic spindle microtubules. It appears that survivin phosphorylation on Thr34 may be required to maintain cell viability at cell division (37), and expression of a phosphorylation-defective survivin mutant has been shown to trigger apoptosis in several human melanoma cell lines (38).
• Phosphorylated survivin acts on the caspase pathway to suppress the formation of caspase-3 and caspase-9, thereby inhibiting apoptosis.
• page 10 presents an outline of apoptosis signalling pathways.
• compounds that reduce the expression of survivin will be expected to increase the rate of apoptosis and cell death.
• CDC-2 has been shown to be necessary for survivin phosphorylation (37).
• novel nordihydroguaiaretic acid derivatives are provided that inhibit tumor growth.
• nordihydroguaiaretic acid derivatives is meant compounds ofthe structure
• Amino acid substituents are intended to include, inter alia, alanine, arginine, asparagine, aspartate, cysteine, glutamate, gluamine, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, valine, 5-hydroxylysine, 4- hydroxyproline, thyroxine, 3-methyll ⁇ istidine, ⁇ -N-methyllysine, ⁇ -N,N,N- trimethyllysine, aminoadipic acid, ⁇ -carboxyglutamic acid, phosphoserine, phosphothreonine, phosphotyrosine, N-methylarginine, and N-acetyllysine.
• Particularly preferred compounds for use according to the invention are
• the method should be especially effective against rapidly proliferating cell types containing the cyclin dependent kinase CDC2. It is a further object ofthe invention to provide a method of inliibiting CDC2 in a eukaryotic cell cycle, particularly in an animal cell, more particularly in a mammalian cell, and most particularly in a human cell.
• Tumors to be treated include any tumor that is sensitive to the above- mentioned compounds used according to the methods ofthe invention. In particular, this includes rapidly dividing cancerous and benign tumors that are sensitive to inhibition ofthe cyclin-dependent kinase CDC2 cycle.
• cancerous tumor is intended to include any malignant tumor that may or may not have undergone metastasis.
• noncancerous tumor is intended to include any benign tumor.
• Tumors to be treated include those that are known to be of viral origin, as well as those that are not of viral origin.
• the compositions and methods ofthe invention are expected to be particularly useful in the treatment of solid tumors.
• HPV-induced tumors include in particular, but are not limited to, cervical, oral, penile and head and neck cancers that are associated with HPV infection.
• the method comprises local application of nordihydroguaiaretic acid derivatives, in particular tetra-O-methyinordihydroguaiaretic acid (M 4 N) and tetraglycinal nordihydroguaiaretic acid (G 4 N), to cancerous and noncancerous HPV-induced tumors.
• M 4 N tetra-O-methyinordihydroguaiaretic acid
• G 4 N tetraglycinal nordihydroguaiaretic acid
• Preferred for use in this method are compounds in which the amino acid substituents Ri , R R 3 and R 4 are identical.
• the inventors have found that the nordihydroguaiaretic acid derivatives ofthe invention downregulate survivin mRNA and protein levels and activate both CDC-2 and the caspase pathway, thereby increasing the level of apoptosis in cell populations where survivin is expressed.
• This method should provide a treatment for cancers where survivin is expressed by suppressing or eliminating survivin expression, thereby increasing the rate of apoptosis.
• M 4 N, G 4 N and other derivatives will be administered by local injection into the tumors, generally along with pharmaceutically acceptable diluents, excipients and carriers.
• M 4 N is injected into tumors in the form of a DMSO solution, and G 4 N is administered in PBS solution.
• G 4 N will complement the use of M 4 N, particularly in larger tumors (> 2 cm 3 ), due to its water solubility, which allows it to spread to a larger region ofthe tumor.
• Other water-soluble and water-insoluble nordihydroguaiaretic acid derivatives can be similarly employed, according to the invention. These may also be employed in lipid based formulations for systemic delivery, as known and used in the art.
• diluents such compounds as will be known to persons of skill in the art as being compatible with M 4 N, G 4 N and other similar derivatives and suitable for local administration to a human or other mammal according to the invention.
• the amount of compound administered to obtain the desired treatment effect will vary but can be readily determined by persons of skill in the art.
• the amount of dosage, frequency of administration, and length of treatment are dependent on the circumstances, primarily on the size and type of tumor. However, dosages of from 10 mg to 20 mg of either M 4 N alone or with similar amounts of G 4 N per gram tumor weight at intervals from daily to weekly or less frequently may be mentioned for purposes of illustration.
• Administration of 50 ⁇ l to 100 ⁇ l of M N dissolved in DMSO at a concentration of 200 mg/ml, either alone or in combination with G 4 N, is expected to be effective in many cases for tumors of 1-1.5 cm 3 .
• FIG. 1A HPV-16 LCR showing region of E 6 /E 7 promoter (pPV16P97) and the binding site for Spl protein.
• FIG. 2B The effect of M 4 N on the E 6 /E 7 promoter activity in C-33A cells. (Inhibition of E 6 /E 7 promoter driven luciferase gene transcription by different concentration of M 4 N)
• Figures 3A-3C Inhibition of Viral E 6 and E 7 RNA Transcripts by 40 ⁇ M M 4 N.
• the RTPCR samples were removed after increasing cycles of amplification and resolved on an agarose gel.
• the gel photographs (3 A and 3B) indicate these cycles, the presence of (+) or absence (-) of M N in the growth media, and two digests of a pGMT vector used as size markers.
• the amplification map (2C) indicates the two expected size products ofthe amplification, resulting from the alternate splicing ofthe early viral RNA transcript.
• FIGS 5A-5B Effect of M 4 N on gene expression in C3 cells as examined by the GENE Assay analysis.
• 5A GENE expressed in C3 cells after > 2 hours of DMSO treatment (C3 DMSO).
• 5B GENE expressed in C3 cells after > 2 hours of M 4 N treatment using DMSO as solvent (C3 M 4 N).
• FIGS 6A-6B Visual observations of tumor-bearing mice following M 4 N treatment.
• 6 A Mice bearing single tumors were treated with in situ injection of DMSO (#3) or M 4 N (#7). In situ injection of M 4 N was also made to one of the two tumors grown in mouse #9. 6B. M 4 N treated tumor (white scar) with untreated tumor from the same mouse, #9 as described in Table 2.
• FIG. 7 Histopathology Effect of M 4 N and M N/G N on Tumor Growth in Mice.
• First column from the panel presents the large size of tumors from mouse #4, 10, 12, following DMSO treatment (CON) as compared to the relatively small drug treated (M f N or M 4 N/G 4 N) lesions from mouse #12, 10, 27 and 20 (M 4 N).
• the subsequent photographs are examples of these tumors examined at 100X magnification (A, B, C, DMSO treated, D untreated, E, F, G, H, M 4 N or M 4 N/G 4 N treated) mice (Table 1 and Table 2).
• FIG 8. HSV-1 replication in the absence of drugs (HSV-C, HSV-SC), in the presence of ineffective drugs (ABDS t [' ⁇ SV-ABDSi”], ABDS 2 ["HSV- ABDS 2 "])and in the presence of effective drags (M 4 N ["HSV-4N"] and ACV ["HSV-ACV”]).
• CEM-T4, C33a, and TC-1 cells were treated with different concentrations of M 4 N.
• the number of cells present at the initiation ofthe experiment is indicated as Day 0.
• the number of viable cells were counted and plotted versus the M N concentration, (e) C3 cells were split into T-25 flasks with 5 X 10 3 cells per flask and given either M 4 N in 1% DMSO in media or 1% DMSO in media alone (first media change).
• M- D fresh media containing only 1% DMSO
• second media change The cells were counted daily and plotted versus the time of treatment.
• FIG. 10 Cells Treated With M 4 N Arrest in G2/M.
• C3 cells (a), C33a cells (b), CEM-T4 cells (c), and TCI cells (d) were grown for three days in media containing either 1% DMSO or 1% DMSO withM 4 N (M 4 N).
• the cells were trypsinized, fixed with ethanol, stained with propidium iodide, and were subsequently analyzed by flow cytommetry.
• the data is displayed as number of cells (3-5 X 10 total cells) versus propidium iodide stain intensity.
• the indicated stages ofthe cell cycle are labeled and correspond to the relative cellular DNA compliment as determined by staining intensity.
• FIG. 11 C3 Cells Treated With 40 ⁇ M M 4 N Demonstrate G2 Cell Structures. C3 cells were grown on coverslips for three days in media containing either 1% DMSO (Control) or 1% DMSO with 40 ⁇ M M 4 N (M 4 N). Samples were fixed with ethanol and incubated with antibodies against ⁇ (green) and ⁇ (orange) tubulin (a) or with the DAPI DNA stain (b). Cells were examined by fluorescence microscopy. Figure 12. CDC2 and Viral Oncogenes are Reduced by M 4 N.
• C3 cells were grown for different amounts of time (numbers are in hours) in media containing either 1% DMSO (D) or 1% DMSO with 40 ⁇ M M 4 N (M). After the specified times, total protein or total RNA was isolated from the cells.
• Western blots (a - top two panels) were performed using antibodies against CDC2 or cyclin B with the same nitrocellulose filter.
• Kinase assays (a - bottom two panels) were performed, following immunoprecipitation with antibodies to cyclin B, by incubation with ⁇ - P ATP and histone HI . The coomassie stain ofthe PAGE gel is included as control for loading. Kinase assays for 24 and 72 hour drug treatments were performed separately.
• Northern blots were performed on total RNA extracts. Filters were incubated overnight with random-primed 32 P-labeled DNA for CDC2 or GAPDH, washed, and exposed to film for three days. The same filter was used to test CDC2 and GAPDH RNA.
• rtPCR analysis was performed on total RNA extracts with primers hybridizing to regions within either HPV- 16 E7 or GAPDH. Both primer pairs were used in the same reactions, and the products were analyzed by agarose gel electrophoresis.
• FIG. 13 Electrophoretic mobility shift assay (EMS A) of G 4 N interaction with the HIV Spl-binding sites (-87 to -49).
• EMS A Electrophoretic mobility shift assay
• Lane 1 template alone; lane 2, template plus 0.1 ⁇ g Spl-167D plus 100-fold excess of unlabeled template; lane 3, template plus 0.1 ⁇ g Spl-167D; lanes 4-10, Spl/DNA complex challenged with increasing concentrations of G N (0.25 to 1.75 mM); lane 11, template incubated in reaction buffer containing 1.75 mM G 4 N.
• C Spl-167D displacement of G 4 N bound to template.
• Lane 1 template alone; lanes 2-4, template plus increasing amounts of Spl-167D (0.075,
• FIG. 15 SIV production with presence of G 4 N. 10 7 174 x cells, a human T-cell lymphoma cell line, were mixed with a 24 hrs. harvest stock of SIV mac 239 (4 ng of p27) for two hours at 37. Cells were resuspended and 1 x 10 5 cells in 100 ⁇ l medium were added to each well of three 96-well plates. Various concentrations of G 4 N from a freshly made stock were prepared and added to each ofthe six designed well. Culture supematants were collected after four and eight days for viral production analysis. Viral production was assayed by a modified p27 capsid protein antigen capture ELISA as described in experimental section.
• Figure 16 Inhibition of HIV p24 antigen production in H9 cells by G 4 N. Inhibition in percentage was calculated by comparing p24 level from an average of two duplicate cultures of G 4 N treated and not treated H9 cells 9 days following viral infection with a AZT resistant HIV strain, HIV-IRTMF.
• FIG. 17 RT-PCR Analysis of Survivin Gene Expression, (a) Top: Survivin gene expression in C3 cells treated with 40 ⁇ M M N for 24 hours and 72 hours, respectively (lanes 3 and 4) and in the untreated controls (lanes 1 and 2). Bottom: the corresponding GAPDH controls. Band intensities were quantitated with Scion Image, (b) Survivin RT-PCR product signals were normalized to those ofthe GAPDH controls and plotted.
• FIG. 19 Immunoblot analysis of caspase-3 cleavage in C3 cells treated with M N for 72 hours, (a) Western blot of caspase-3 showed cleavage ofthe 32 KD procaspase-3 and the formation ofthe active 20 KD cleaved product, (b) Band intensities were quantitated and plotted against M N concentration.
• NDGA derivatives were synthesized chemically (7).
• Cell line C3 is a HPV16E + L plus activated Ras transformed cell line of C57 BL/6kh origin provided by W. Martin Kast of Loyola University Medical Center, Chicago, Illinois, U.S.A. It is maintained and cultivated as described by Greenstone et Al. (18) and Feltkamp et al. (19, 20).
• Nitrogen gas was used as a carrier gas and the flow rate was kept constant at 14.0 ml/min.
• the retention time (t R ) was measured under the following conditions: injector temperature 260°C, isothermal column temperature 280°C.
• Gas chromatography and low resolution mass spectral analyses were performed on a Hewlett-Packard 5890 Series II instrument equipped with a Hewlett-Packard 5971A Mass Selective Detector and a capillary HP-1 column. Separations by medium-pressure liquid chromatography (MPLC) were performed at a flow rate of 120 ml/h by use of a Jasco Model 880-PU intelligent HPLC pump.
• MPLC medium-pressure liquid chromatography
• the MPLC packing material Reversed Phase Silica Gel C18 (particle size 0.035-0.070 mm), was purchased from Knauer Co. Purification by gravity column cliromatography was carried out by use of Merek Reagents Silica Gel 60 (particle size 0.063-0.200 mm, 70-230 mesh ASTM).
• JR Infrared
• FT-LR Bomem Michelson Series FT-LR spectrometer
• the wave numbers reported are referenced to the polystyrene 1601 cm "1 absorption. Absorption intensities are recorded by the following abbreviations: s, strong; m, medium; w, weak.
• Proton NMR spectra were obtained on a Varian Unity-400 (400 MHz) spectrometer by use of D20 as solvent and 3-(trimethylsilyl)propionic acid, sodium salt as internal standard.
• Carbon- 13 NMR spectra were obtained on a Varian Unity-400 (100 MHz) spectrometer by use ofD 2 0 as solvent.
• Carbon- 13 chemical shifts are referenced to the center ofthe 3-(trimethylsilyl)propionic acid, sodium salt singlet (6 0.0 ppm). Multiplicities are recorded by the following abbreviations: s, singlet; d, doublet; t, triplet; q, quartet; m, multiplet; J. coupling constant (hertz). High-resolution mass spectra were obtained by means of a JEOL JMS-HX110 mass spectrometer. meso- 1 ,4Bis[3 ,4(dimethyleminoacetoxy)phe 3 S-dimethylbutane Hydrochloride Salt (2).
• C33 A is a cervical tumor cell line (ATCC accession no. HTB-31) that does not contain any integrated HPV DNA, but has transcription factors necessary for a robust expression ofthe HPV early gene promoter.
• DMSO dimethyl sulfoxide
• HPV-16 transformed immortal mouse epithelial cells were plated at a density of 10 5 cells per vial. After 24 hours, l A ofthe vials were given growth media containing 40 ⁇ M M 4 N dissolved in 1% DMSO while the other half were given growth media containing only 1% DMSO. The results are shown in Figure 4A. Within 24 hrs a difference in cell morphology between drug treated and control C3 cells was observed. The growth and division ofthe drug treated cells was markedly reduced in comparison to the untreated control, while the fraction of viable cells compared to the total cell count remained constant for both drug treated and DMSO only control cells. This indicates that M 4 N dramatically reduces cell division.
• C3 cells were plated at a density of 10 4 cells per vial.
• 2/3 ofthe vials were given growth media supplemented with 40 ⁇ M ⁇ N in 1% DMSO.
• the remaining vials were given growth media containing only 1% DMSO.
• l A ofthe vials that had received M 4 N in their growth media were washed and media containing only 1% DMSO was added.
• the other 2/3 ofthe cell vials were washed and replaced with the same media administered before.
• the results, shown in Figure 4B indicate that the rate of cell growth was not notably increased in M 4 N treated sample following the change to drag-free media, indicating that M 4 N continues to significantly reduce cell division even after its removal from the extracellular environment.
• Example 4 Analysis of cellular gene expression in C3 cells before and after 72 hrs of drug treatment.
• the computer print outs showing differentially expressed genes (C 3 M 4 N/C 3 DMSO >10 and C 3 DMSO/C 3 M 4 N >10) were listed for examination.
• Image files in TLFF format and data files in MS excel format are kept on ZIP diskette.
• Gene names and clone ID numbers are available for obtaining Image clones for future northern blot confirmation.
• Cyclin-dependent kinase 7 (5%) 100% Human cytokine receptor (2%) 100% Proliferating cell nuclear antigen, PCNA (1%) 100% Human TNF-related Apoptosis AP0 2 (3%) 100% Cysteine protease (7%) 100%
• E 6 /E 7 level was found to be similar with those in control cells while after 4.5 hrs, E 6 /E 7 were no longer detectable by RT-PCR (10).
• Gene expressions with 9600 gene arrays can be repeated with RNA isolated from these short-time treated cells (1 hour and 5 hours) in order to further pin down the initial cellular effects ofthe drug.
• mice Thirty six C57M-16 NCR mice were injected with 5 x 10 5 C3 cells between the shoulders on the backs ofthe mice. Twenty four ofthe mice developed tumors within 20 days. Daily injection (50 ⁇ .1-100 ⁇ l of M 4 N or
• M 4 N/G 4 N (200 mg/ml M 4 N in DMSO, 200mg/ml G 4 N in PBS) showed profound effect in tumor growth in animals, as shown in Tables 1 and 2, Fig. 6 and 7. Table 1. M*N and G 4 N Effect on Growth of Single Tumors Developed in Mice
• mice developed tumors. Their lesion sizes were measured by dial caliper. These mice were shaved, weight and treatment begun (Day 1). Four mice were sequestered as controls. Control mice received 50 ⁇ l DMSO injected intratumorally daily. Experimental mice (10) received 50 ⁇ l 4 N dissolved in DMSO(200mg/mL). An additional 10 mice received M 4 N treatments for 8 days followed by G 4 N treatments (50 ⁇ l, 200mg/ml in PBS) daily for 8 days. Injections were made to several regions of tumor. Mice anesthetized with ether or metaphane prior to injection.
• mice All treated mice, controls (mouse numbers 1-4) and experimental mice (mouse numbers 6, 7, 9, 10, 11, 12, 14, 15, 16, 17 M 4 N numbers 18-22, 24, 26-29 M 4 N/G 4 N) exhibited swelling. Measurements of lesion sizes were made by dial caliper. Some mice experienced mild bleeding due to injection. The treatment regimen and results were as follows:
• Day 15 One M 4 N treated mouse (#17) died due to overdose of anesthesia/handling. The skin at the lesion site of #17 cracked with the "dried-out tumor" showing. It was dissected, and lesion excised and weighed.
• Day 16 Four more M N treated mice (#6, 14, 15, 16), three M 4 N/G 4 N treated mice (#19,21,28) and one control mouse (#2) were euthanized, dissected and weighed. Remaining control mice (#1, 3, 4) were examined non-invasively and were carrying tumors. Day 21 : Tumor sizes from control mice were measured by dial caliper.
• mice The skin at the lesion sites of mouse #10 and #12 (M 4 N treated regions) cracked with the "dried-out tumor" showing.
• Day 24 Mouse #7 skin recovered completely. The experiment was terminated on this date. All remaining mice, M 4 N treated (#7, 9, 10, 11, 12) and M 4 N/G 4 N treated (#18, 20, 24, 26, 29) were euthanized, dissected, examined and weighed.
• Tables 1 and 2 and Figures 5 and 6 The effects of M 4 N and M 4 N/G 4 N on C3 tumor growth in mice are summarized in Tables 1 and 2 and Figures 5 and 6.
• Table 1 shows the drug • effect on C3 cell growth in mice carrying single tumors.
• the average weight of four excised tumors ofthe control group was 1.48 g while weights of lesions from M N treated and M 4 N/G 4 N treated were 0.142 and 0.51 g respectively.
• Drug treated lesions consisted mainly of dried out necrotic cells (Fig. 6). Tumors from the control group appeared homogenous and contained actively growing cells.
• Table 2 shows the drug effect on C3 tumor growth in mice carrying multiple tumors. In this study, drag was injected into one ofthe tumors.
• the average weight of untreated tumors was 1.77 g while that of M N treated lesions was 0.15 g. Similar results were obtained following M N/G 4 N inj ection — the average weight of untreated tumors was 1.27 g, while that ofthe drag treated lesions was only 0.103 g. The body weight changes of all mice during the entire experimental period appeared insignificant (Table 1 and 2).
• Drug treated (M 4 N) and DMSO vehicle-treated or untreated tumors (CON) from two groups of mice were prepared for histopathology examination.
• the excised tumors were immediately fixed and then stored in 4% formaldehyde in phosphate buffered saline.
• the fixed tissue was then dehydrated through a series of graded alcohols and xylene and embedded in paraffin.
• the paraffin tissue blocks were thin sectioned and stained for microscopy with hematoxylin and eosin. Histopathology studies showed that the control tumors were unaffected by DMSO treatment and continued to grow.
• the drag M 4 N was also tested in inhibition of HSV-1 replication in skin infections in guinea pigs. Guinea pig skin was pinched with needles and HSV-1 suppression was applied topically to infect each pricked area. M 4 N was then applied to the pricked infected area following infection daily for 6 days.
• HSV-1 HSV-C, culture supernatant, or isolated HSV in saline, HSV-SC.
• HSV-SC culture supernatant, or isolated HSV in saline, HSV-SC.
• HSV-SC culture supernatant, or isolated HSV in saline, HSV-SC.
• test compounds ABDSi, ABDS 2 , ACV and M 4 N (4N) in 60 mg/ml of DMSO were applied to each punched infected region of an area, five times per day for six days.
• ABDS 1 and ABDS were included as negative controls.
• M 4 N is a hydrophobic compound and is exceedingly soluble in DMSO (200 mg/ml). Therefore only a small volume ofthe drag solution is needed for injection in order to achieve effective dosage ofthe drag.
• DMSO 200 mg/ml
• daily injection of 50 ⁇ l to 100 ⁇ l for several days was sufficient to completely stop tumor growth in mice.
• DMSO should be safe as a vehicle for drug delivery when only small volume of it will be used (23). 2)
• a majority ofthe drug residue remains insoluble and concentrated in the tumor areas, and does not enter the circulatory system, thus whole body toxicity is avoided.
• enough drug remains within the tumor to suppress its growth, continued injection of drug is unnecessary after relatively few treatments.
• tumor cells continued to die even after discontinuation of M 4 N injections.
• tumor size becomes the determining factor for the required amount of drug to be administered.
• the difference between whole body weights of a human vs. a mouse becomes irrelevant.
• 20 mg/day for 10 days were more than sufficient to eliminate tumors.
• M 4 N may therefore block their transcription. This hypothesis was tested by examining the antiproliferative effect of M 4 N on a number of different cell lines. Low concentrations (10 ⁇ M) ofthe parent compound, NDGA, have previously been shown to induce apoptosis in mammalian cells (24). This effect, however, can be circumvented by blocking one ofthe catechol oxygens or the addition of a hydrophilic group to NDGA (25).
• the centrosomes of M 4 N treated cells are duplicated but still located next to each other in the nucleus ofthe cell. Since centrosomes separate during early prophase, it can be concluded that these cells have not begun mitosis.
• the gamma tubulin staining ofthe control cells has the diffuse pattern characteristic of Gl or S phase (29). A lack of cliromatin condensation in the M 4 N treated cells was also observed with DAPI staining ( Figure 12b), additional evidence that the cells have not moved forward out of G2 phase (30).
• the use ofthe C3 cell line allows us an additional control for analysis ofthe mechanism of M 4 N mediated cell cycle arrest since other Spl- dependent gene promoters are also likely to be inhibited by M 4 N treatment.
• This possibility was examined in C3 cells by analyzing the effect of M 4 N on transcription from the Spl dependent HPV-16 E 6 /E 7 promoter.
• rtPCR analysis of RNA isolated from C3 cells treated with 40 ⁇ M M 4 N for 5 to 72 hours demonstrated a clear reduction in the levels ofthe E 7 transcript (Figure 12c).
• GAPDH was again used as an internal control in this experiment, and its levels were unaffected by drag treatment.
• Spl family proteins induce bends toward the major groove of DNA upon binding (33).
• the zinc finger domain ofthe Spl protein is responsible for the binding ofthe GC Box sequence 5'-GGGGCGGGG-3'. From computational analysis, it was determined that G 4 N, the aminoester derivative of NDGA, could form a stable complex with such a sequence in the major groove.
• G 4 N can serve as an Spl blocker as well as an Spl displacer
• DNA binding domain of recombinant Spl protein was next added and incubated for additional 30 min in the presence of a large excess of BSA protein.
• the recombinant SP1-167D was first allowed to bind DNA, G 4 N was then added at the second step ofthe incubation.
• the G 4 N and Spl-167D concentrations and, the incubation and gel electrophoresis conditions were identical in both studies (experimental section). As shown in Figure 13, in either case, G 4 N was found to be able keep DNA from interacting with Spl-167D protein.
• methylated NDGA derivatives can block Spl binding to the enhancer sites of a variety of viral promoters including HIV, ICP4 of HSV, E 6 /E 7 gene of HPV (8, 9, 10).
• G 4 N effect on the Tat-transactivation of HTV promoter activity in Cos cells by the SEAP assay as previously described. Basal level ofthe HIV LTR driven SEAP. expression was previously found to be barely detectable in Cos cells. There were 60-fold or more increase in SEAP expression when Cos cells were cotransfected with the CMV promoter driven Tat gene (8).
• Such Tat-driven transactivation ofthe HIV LTR promoter activity was previously shown to be Spl regulated (7, 8).
• C3 cells (5xl0 6 ) were seeded in 150-mm plates and allowed to attach to the plates. Twenty-four hours after seeding, cultures were washed twice with PBS and treated with M 4 N dissolved in 1% DMSO mixed with the growth medium.
• Cell extracts and immunoblotting were lysed in lysis buffer containing 50 mM HEPES pH 7,250 mM NaCl, 0.1% (v/v) Nonidet P-40, 10% glycerol, lmM DTT, and 50 ⁇ l/ml protease inhibitor cocktail (Sigma). Protein concentration ofthe extract was determined by the Bradford assay (Bio-Rad Laboratories), and then 50 ⁇ g of protein was separated by SDS-PAGE and electrotransferred to nitrocellulose membrane (ECL). Membranes were incubated with primary antibodies against Survivin (Santa Craz Biotechnology) and caspase- 3 (Santa Cruz Biotechnology). Blots were then incubated with anti-rabbit biotin- conjugated secondary antibody and then with Avidx-APTM streptavidin-alkaline phosphatase, and detected with CSPD® substrate (Tropix).
• RT-PCR analysis mRNA was isolated by the guanidinium thiocyanate and phenol method from the cultured cells as described in Molecular Cloning (40). A 343-base pair RT-PCR product was generated by using the survivin-sense oligonucleotide primer 5'-GCATCGCCACCTTCAAGAACTGGCCC-3' and the survivin-antisense oligonucleotide primer 5'-
• GAPDH sense and anti-sense primers 5'-GAATCTACTGGCGTCTTCACC-3' and 5'- GTCATGAGCCCTTCCACGATGC-3 ' were used to generate a 238-base pair RTPCR product as a control.
• mRNA aliquots were incubated in 20 ⁇ l reaction buffer containing 1 U or rRNAsin and DNAse at 75°C for 5 minutes followed by reverse transcription reaction with MMLV (Promega).
• the c-DNA products obtained were amplified under the PCR conditions: 55°C for 55 seconds, 60°C for 55 seconds, and 72°C for 1 minute for 30 cycles.
• PCR products were separated by electrophoresis on a 1.8% agarose gel containing ethidium bromide and photographed under UV. The bands were quantitated by Scion Image and the signal intensities ofthe survivin PCR reaction products were normalized to those ofthe GAPDH PCR products to generate a survivin gene down-regulation graph.
• M 4 N treatment we treated the cells with 40 ⁇ M M 4 N for 24 hours and 72 hours. As shown in Figure 1, treatment of cells with M 4 N resulted in a significant decrease in survivin gene expression in a time-dependent manner. Treatment with 40 ⁇ M M N for 24 hours and 72 hours resulted in 65% and 80% reduction in survivin expression, respectively. Untreated cells did not show any reduction in survivin gene expression.
• Survivin protein was also shown by immunoblotting to be downregulated by 72 hours of N treatment. This downregulation was dosage-dependent ( Figure 2).
• G. Spl can displace GHF-1 from its distal binding site and stimulate transcription form growth hormone gene promoter. Moll Cell. Biol. 1990, 10, 1811. 17. Phelps, W. C, Yee, C. L., Munger, K. and Howley, P. M. (1988) The Human Papilloma Virus Type 16 E7 Gene Encodes Transactivation and Transformation Functions Similar to Those of Adeno viras E/A. Cell 53, 539-547.

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