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P48: A novel nuclear protein possibly associated with aging and mortality

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Abstract

The synthesis ([35S]-incorporation) of stress proteins (sps, i.e., 24, 25, 70, 90 Mr) and of nuclear protein 48 (p48) was investigated in the heart and bone marrow cells of three groups of male Fischer 344 rats following administration of isoproterenol (IPR). Two groups of rats, young ad libitum (Y/AL-31/2 months) and old/AL (O/AL-28 months), had full access to rat chow; a third group of old diet restricted (O/DR-28 months) rats was maintained on a diet restricted intake of 40% of the Y/AL animals. Sp synthesis in the bone marrow (25, 70, 90 Mr) and heart (24, 70, 90 Mr) nuclei of O/AL was significantly reduced, as compared with Y/AL and O/DR rats, following their induction with IPR. A unique sp24 was expressed in heart following IPR dosing. A 1 mg/kg dose of IPR was lethal for O/AL, but not for Y/AL or O/DR animals. This lethal dose induced synthesis of p48 in heart and bone marrow nuclei of O/AL rats only. P48 existed in isoform states in bone marrow, and when a lethal dose of IPR was administered in this tissue, it was expressed in O/AL rats in a cell-cycle regulated pattern. Stress proteins and other non-sps were seen as cell cycle regulated following IPR administration. P48 in bone marrow and heart nuclei from O/AL rats showed an antigenic response identical to that of p48 in HL60 nuclei. The presence of p48 is correlated with mortality and with an ad libitum diet in old rats, since it is absent in old diet restricted animals; therefore, DR may impede the expression of p48 through a mechanism(s) that is undisclosed at this time.

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Authors and Affiliations

  1. Division of Genetic Toxicology, National Center for Toxicological Research, HFT-120, 3900 NCTR Road, Jefferson, Arkansas, 72079-9502, USA

    J. L. Pipkin Ph.D., L. E. Lyn-Cook, R. J. Feuers & D. A. Casciano

  2. Office of Research Support, National Center for Toxicological Research, Jefferson, Arkansas, USA

    W. G. Hinson

  3. Biometry and Risk Assessment, National Center For Toxicological Research, Jefferson, Arkansas, USA

    P. H. Duffy, J. E. A. Leakey & R. W. Hart

  4. University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA

    J. L. Pipkin Ph.D., R. J. Feuers & D. A. Casciano

  5. Faculty of Medicine, Cairo University, Cairo, Egypt

    K. B. Aly

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  1. J. L. Pipkin Ph.D.
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  2. W. G. Hinson
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  3. L. E. Lyn-Cook
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  4. P. H. Duffy
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  6. J. E. A. Leakey
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  9. D. A. Casciano
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Pipkin, J.L., Hinson, W.G., Lyn-Cook, L.E. et al. P48: A novel nuclear protein possibly associated with aging and mortality. Aging Clin Exp Res 8, 311–319 (1996). https://doi.org/10.1007/BF03339587

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  • DOI: https://doi.org/10.1007/BF03339587

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