Slow-down of age-dependent telomere shortening is executed in human skin keratinocytes by hormesis-like-effects of trace hydrogen peroxide or by anti-oxidative effects of pro-vitamin C in common concurrently with reduction of intracellular oxidative stress

Journal of Cellular Biochemistry
Seiichi YokooNobuhiko Miwa

Abstract

The cellular life-span of cultivated human skin epidermis keratinocytes NHEK-F was shown to be extended up to 150% of population doubling levels (PDLs) by repetitive addition with two autooxidation-resistant derivatives of ascorbic acid (Asc), Asc-2-O-phosphate (Asc2P), and Asc-2-O-alpha-glucoside (Asc2G), respectively, but to be not extended with Asc itself. In contrast, hydrogen peroxide (H(2)O(2)) as dilute as 20 microM which was non-cytotoxic to the keratinocytes, or at 60 microM being marginally cytotoxic achieved the cellular longevity, unexpectedly, up to 160 and 120% of PDLs, respectively, being regarded as a hormesis-like stimulatory effect. The lifespan-extended cells that were administered with Asc2P, Asc2G, or 20 microM H(2)O(2) were prevented from senescence-induced symptoms such as PDL-dependent enlargement of a cell size of 14.7 microm finally up to 17.4 microm upon Hayflick's limit-called loss of proliferation ability as estimated with a channelizer, and retained young cell morphological aspects such as thick and compact shape and intense attachment to the culture substratum even upon advanced PDLs, whereas other non-extended cells looked like thin or fibrous shape and large size upon lower PDLs. The PDL-depende...Continue Reading

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Citations

Oct 12, 2010·Médecine sciences : M/S·Nathalie Thorin-TrescasesEric Thorin
Aug 11, 2010·Proceedings of the National Academy of Sciences of the United States of America·Ana MesquitaPaula Ludovico
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