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Differential methylation of HMG proteins by dexamethasone in the liver of aging rats

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Abstract

In vitro methylation of HMG proteins was studied in young and old rats by incubating liver slices with (methyl-14C)methionine. The level of methylation of all the four HMG proteins was relatively higher in young, as compared to old rats. Dexamethasone stimulated the methylation of HMG 2 to 12-fold, and inhibited that of other HMGs in young rats. On the other hand, it stimulated all major HMG proteins except HMG 2, which remains unchanged in old age. Such differential methylation of HMG proteins induced by dexamethasone affects the structure and function of chromatin during aging. (Aging 3: 333-335,1991)

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References

  1. Cartwright I.L., Abmayr S.M., Fleischmann G., Lowenhaupt K., Elgin S.C.R., Keene M.A., Howard G.C.: Chromatin structure and gene activity: The role of non-histone chromosomal proteins. CRC Crit. Rev. Biochem. 13: 1–86, 1982.

    Article  PubMed  CAS  Google Scholar 

  2. Thakur M.K.: Age-related changes in the structure and function of chromatin: A review. Mech. Ageing Dev. 27: 263–286, 1984.

    Article  PubMed  CAS  Google Scholar 

  3. Johns E.W.: The HMG Chromosomal Proteins. Academic Press, London, 1982.

    Google Scholar 

  4. Boffa L.C., Sterner R, Vidali G., Allfrey V.G.: Post-synthetic modifications of nuclear proteins: high mobility group proteins are methylated. Biochem. Biophys. Res. Commun. 89: 1322–1327, 1979.

    Article  PubMed  CAS  Google Scholar 

  5. Thakur M.K., Kanungo M.S.: Methylation of chromosomal proteins and DNA of rat brain and its modulation by estradiol and calcium during aging. Exp. Gerontol. 16: 331–336, 1981.

    Article  PubMed  CAS  Google Scholar 

  6. Goodwin G.H., Rabbani A., Nicolas R.H., Johns E.W.: The isolation of the HMG non-histone chromosomal proteins HMG 14. FEBS Lett 80: 413–416, 1977.

    Article  PubMed  CAS  Google Scholar 

  7. Thakur M.K., Prasad S.: Age-specific methylation of high-mobility group proteins of the rat liver and its modulation by spermine and sodium butyrate. Mutat. Res. 219: 107–111, 1989.

    Article  PubMed  CAS  Google Scholar 

  8. Garrett H.E.: Statistics in Psychology and Education. David McKay Inc., New York, 1966.

    Google Scholar 

  9. Thakur M.K.: Covalent modifications of chromosomal proteins during aging. Arch. Gerontol Geriatr. 2: 1–10, 1983.

    Article  PubMed  CAS  Google Scholar 

  10. Ono T., Takahashi N., Okada S.: Age-associated changes in DNA methylation and mRNA level of the c-myc gene in spleen and liver of mice. Mutat. Res. 219: 39–50, 1989.

    Article  PubMed  CAS  Google Scholar 

  11. Rath P.C., Kanungo M.S.: Methylation of repetitive DNA sequences in the brain during aging of the rat. FEBS Lett. 244: 193–198, 1989.

    Article  PubMed  CAS  Google Scholar 

  12. Chaturvedi M.M., Kanungo M.S.: Analysis of chromatin of the brain of young and old rats by nick-translation. Biochem. Biophys. Res. Commun. 127: 604–609, 1985.

    Article  PubMed  CAS  Google Scholar 

  13. Stramentoli G., Gualano M., Catto E., Algeri S.: Tissue-levels of S-adenosylmethionine in aging rats. J. Gerontol. 32: 392–394, 1977.

    Article  Google Scholar 

  14. Tremethick D.J., Molloy P.L.: Stimulation of transcription from different RNA polymerase II promoters by high mobility group proteins I and II. FEBS Lett. 242: 346–350, 1989.

    Article  PubMed  CAS  Google Scholar 

  15. Einck L., Bustin M.: The intracellular distribution and function of the high mobility group chromosomal proteins. Exp. Cell Res. 156: 295–310, 1985.

    Article  PubMed  CAS  Google Scholar 

  16. Bucci L.R., Brock W.A., Goldknopf I.L., Meistrich M.L.: Characterization of high mobility group protein levels during spermatogenesis in the rat. J. Biol. Chem. 259: 8840–8846, 1984.

    PubMed  CAS  Google Scholar 

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Prasad, S., Thakur, M.K. Differential methylation of HMG proteins by dexamethasone in the liver of aging rats. Aging Clin Exp Res 3, 333–335 (1991). https://doi.org/10.1007/BF03324031

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