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(12) United States Patent (10) Patent No.: US 6,465,440 B2 Von Borstel Et Al

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(12) United States Patent (10) Patent No.: US 6,465,440 B2 Von Borstel Et Al USOO646544OB2 (12) United States Patent (10) Patent No.: US 6,465,440 B2 VOn Borstel et al. (45) Date of Patent: Oct. 15, 2002 (54) ANTMUTAGENIC COMPOSITIONS FOR OTHER PUBLICATIONS TREATMENT AND PREVENTION OF Birmingham et al, Systemic Absorption of Topical Salicyclic PHOTODAMAGE TO SKIN Acid., Pharmacology and Therapeutics, (1979) vol. 18, No. 3, pp. 229-231. (75) Inventors: Reid W. von Borstel, Potomac, MD Pashko, Laura L., et al., Carcinogenesis, Vol. 12, No. 11, pp. (US); Fedor Romantsev, Gaithersburg, 2189–2192, 1991 “Inhibition of MD (US) 12-O-tetradecanoylphorbol-13-acetate-oromoted skin tumor formation in mice by (73) Assignee: Wellstat Therapeutics Corporation, 15W-fluoro-5-androsten-17-one and its reversal by deox Gaithersburg, MD (US) yribonucleosides”. Yew, Foch F.-H., et al., Biochimica et Biophysica Acta, 562 (*) Notice: Subject to any disclaimer, the term of this (1979) 240–251“Ultraviolet-Induced DNAExcision Repair patent is extended or adjusted under 35 in Human Bandt Lymphocytes”. U.S.C. 154(b) by 0 days. Yarosh, Daniel, et al., Applied Genetics, Inc., (1992) pp. 4227-4231, “Pyrimidine Dimer Removal Enhanced by DNA Repair Liposomes Reduces the Incidence of UV Skin (21) Appl. No.: 09/871,973 Cancer in Mice'. Musk, P., et al, Mutation Research, 227 (1989) 25–30, (22) Filed: Jun. 4, 2001 “Solar and UVC-induced mutation in human cells and (65) Prior Publication Data inhibition by deoxynucleosides”. Bianchi, Vera, et al., Mutation Research, 146(1985) US 2001/0044419 A1 Nov. 22, 2001 227–284, “Accuracy of UV-induced DNA repair in V/9 cells with imbalance of deoxynucleotide pools”. Related U.S. Application Data Leder, Aya, et al., Proc. Natl. Acad. Sci. USA, Vol. 87, pp. 9178-9182, Dec. 1990 Genetics, “v-Ha-ras transgene abro (60) Division of application No. 09/185,084, filed on Nov. 3, gates the initiation Step in mouse Skin tumorigenesis: Effects 1998, now Pat. No. 6,255.290, which is a continuation-in of phorbol esters and retinoic acid”. part of application No. 08/963,831, filed on Nov. 4, 1997, Nature, vol. 372, Dec. 1, 1994, pp. 413–414, “DNA damage now abandoned. and melanogenesis'. (51) Int. Cl................................................. A61K 31/70 Green, Michael H.L., et al, Mutation Research, DNA Repair, (52) U.S. Cl. ............................. 514/45; 514/46; 514/47; 315 (1994) 25–32, “Effect of deoxyribonucleosides on the 514/48; 514/49; 514/50, 514/51; 514/944; hyperSensitivity of human peripheral blood lymphocytes to 514/969 UV-B and UV-C irradiation. Kwon, Nyoun Soo, et al., J. Exp. Med., The Rockefeller (58) Field of Search .............................. 514/45, 46, 47, University Press, vol. 174, Oct. 1991, pp. 761–767, “Inhi 514/48, 49, 50, 51,944, 969 bition of tumor Cell Ribonucleotide Reductase by Macroph age-derived Nitric Oxide”. (56) References Cited Newman, C.N., et al, Mutation Research, 200 (1988) 201-206, “Modulation of DNA precursor pools, DNA syn thesis, and ultraviolet sensitivity of a repair-deficient CHO U.S. PATENT DOCUMENTS cell line by deoxycytidine”. 3,797.494 3/1974 Zaffaroni Oliver, F. Javier, et al, Biochem. J., (1996) 316, 421–425, 3,937,809 2/1976 Jacobi "Regulation of the Salvage pathway of deoxynucleotides 4,537,776 8/1985 Cooper Synthesis in apoptosis induced by growth factor depriva 4,557,934 12/1985 Cooper tion'. 5,091,379 2/1992 Aungst McKelvey, Valerie June, et al, Leukemia Research, Vo. 12, 5,246,708 9/1993 von Borstel et al. No. 2, pp. 167-171, 1988, “Synergism Between U.V. and 5,250.290 10/1993 Giacomoni et al. Thymidine Treatments in the Induction of Cytogenetic 5,519,059 5/1996 Sawaya Damage in Wild-Type Friend Erythroleukaemia Cells”. 5,691,320 11/1997 von Borstel et al. 5,770.582 6/1998 Borstel et al. Primary Examiner James O. Wilson 6,020,320 2/2000 von Borstel et al. (74) Attorney, Agent, or Firm Nixon & Vanderhye 6,020,322 2/2000 von Borstel et al. (57) ABSTRACT 6,060,459 5/2000 von Borstel et al. 6,277,892 1. 8/2001 Deckner et al. A method of improving DNA repair and reducing DNA damage and for reducing mutation frequency in Skin for the FOREIGN PATENT DOCUMENTS purpose of reducing consequences of exposure to Solar or EP O 043 738 10/1985 ultraViolet radiation is disclosed. The methods comprise WO 89/03838 5/1989 administering to the skin a composition containing deoxyri WO 94/13687 6/1994 bonucleosides in concentrations Sufficient to enhance DNA WO 94/26761 11/1994 repair or reduce mutation frequency in a vehicle capable of WO 95/01773 1/1995 delivering effective amounts of deoxyribonucleosides to the WO 96/O1115 1/1996 necessary skin cells. WO 96/293O2 9/1996 WO OO/11952 3/2000 30 Claims, No Drawings US 6,465,440 B2 1 2 ANTMUTAGENC COMPOSITIONS FOR has been reported to increase the rate of unscheduled DNA TREATMENT AND PREVENTION OF synthesis, which is often used as an index of DNA repair PHOTODAMAGE TO SKIN activity (Kludas and Heise, U.S Pat. No. 4,464,362), in UV-exposed skin; however, this effect was not confirmed in This is a divisional of application Ser. No. 09/185,084, a Subsequent Study (Natarajan et al., Mutation Research filed Nov. 3, 1998, now U.S. Pat. No. 6,255,290, which is a 206:47–54, 1988). continuation-in-part of Ser. No. 08/963,831 filed Nov. 4, The key issue in DNA repair, however, is not necessarily 1997 now abandoned, the entire content of which is hereby the rate of lesion excision, but the fidelity of repair. Agents incorporated by reference in this application. which accelerate the excision Step of DNA repair can actually exacerbate damage if the cells are incapable of FIELD OF THE INVENTION accurate repair Synthesis at a rate that matches the rate of excision of damaged segments of DNA (Collins and This invention relates generally to treatment and preven Johnson, J. Cell Physiol. 99:125-137, 1979). tion of photodamage, genetic damage, and tumorigenesis in Deoxyribonucleosides or deoxyribonucleotides have been skin and other tissues caused by exposure to Solar or 15 added to cells in culture with variable or divergent effects on ultraViolet radiation or other mutagens, comprising admin DNA damage or mutagenesis in response to irradiation of istration of deoxyribonucleosides or esters of deoxyribo the cells. In Some cell types, e.g. lymphocytes, which have nucleosides to a mammal Such as a human. These com limited capabilities for de novo deoxyribonucleotide pounds are capable of reducing DNA damage, mutation Synthesis, exogenous deoxynucleosides are reported to frequency, and tumorigenesis when applied topically before, improve cell Survival after exposure to UV radiation (Yew during, or after exposure to mutagenic radiation or chemical and Johnson, Biochim. Biophys. Acta, 562:240-251, 1979; mutagens. Green et al., Mutation Research, 350:239-246, 1996) or BACKGROUND OF THE INVENTION ionizing radiation (Petrovic et al., Int. J. Radiat. Biol., 18:243, 1970); no significant improvement in survival was Exposure of skin to ultraviolet (or ionizing) radiation 25 seen after addition of deoxyribonucleosides to UV-irradiated damages DNA, which if unrepaired or improperly repaired, normal human fibroblasts (Green et al., Mutation Research, can lead to carcinogenesis as well as contribute to accelera 350:239-246, 1996). A crucial point is that increasing cell tion of the aging process. DNA damage and consequent Survival after genomic damage caused by UV radiation or genomic instability are defining characteristics of both car other mutagens is not necessarily desirable. The process of cinogenesis and biological aging. Patients with defective programmed cell death, or apoptosis, is integrated with DNA repair capabilities in diseases like Xeroderma pigmen cellular mechanisms for detecting DNA damage. Thus, tosa display premature Skin aging and a very high incidence genomic damage which by itself is not Sufficient to cause of skin cancers (Robbins and Moshell, J. In v. Dermatol., cell death, can trigger apoptosis, an active cellular Suicide 73:102-107, 1979) on Sun-exposed areas of the skin. Phar process, So that the DNA damage in the cell is not perpetu macological intervention in damage to skin due to Solar or 35 ated in Subsequent cell generations, with tumorigenesis as a ultraViolet radiation has heretofore been largely restricted to possible outcome as genomic damage accumulates. The agents like SunScreens or free-radical Scavengers intended to mechanisms for detecting genomic damage and inducing prevent damage, or agents like retinoic acid or glycolic acid apoptosis involve cell-cycle regulating proteins Such as the which are intended to remodel the Surface of radiation tumor-Suppressor protein p53. Therefore, agents which pro damaged skin without necessarily addressing the most fun 40 mote cell Survival (e.g. by inhibiting apoptosis) after irra damental mechanisms of cell or tissue damage and repair at diation are not necessarily anticarcinogenic, and may actu the level of genomic integrity. ally enhance mutation frequency and risk of malignant In practice, preventive measures like Sunscreen use are transformation by permitting Survival of damaged cells that not completely effective, and exposure to Sunlight is not would otherwise be eliminated by apoptosis. A significant always anticipated. The incidence of skin cancers in the 45 illustration of this principle is the demonstration that embry United States approaches 1,000,000 cases per year. onic p53 knockout mice exposed to ionizing radiation in Therefore, there exists a need for a therapeutic agent which utero have a higher survival rate (live birth) than wild-type will reduce the risk of development of skin cancer or other controls, but also have a much higher frequency of congeni consequences of skin photodamage even when applied after tal defects (Norimura et al., Nature Medicine, 2:577-580).
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