Leonard Hayflick

Leonard Hayflick (May 20, 1928 – August 1, 2024) was a professor of anatomy at the UCSF School of Medicine and was a professor of medical microbiology at Stanford University School of Medicine. He is known for the Hayflick limit and won more than 25 major awards. Quotes Age-related sensory changes can be traced to degeneration in some of the cells and cell products that compose the sense organ itself. How and why we age 1994 Ballantine Books 177 https://books.google.com/books?id=E2pHAAAAMAAJ&focus=searchwithinvolume&q=loss Natural selection favors animals that are most likely to become reproductively successful by developing better survival strategies and greater reserve capacity in vital systems to better escape predation, disease, accidents, and environmental extremes. Natural selection diminishes after reproductive success because the species will not benefit from members favored for greater longevity. The level of physiological reserve remaining after reproductive maturity determines longevity and evolves incidental to the selection process that acts on earlier developmental events. Physiological reserve does not renew at the same rate that it incurs losses because molecular disorder increases at a rate greater than the capacity for repair. These are age changes, and they increase vulnerability to predation, accidents, or disease. Experimental Gerontology 1998 33 7-8 639–653 How and why we age 9951612 https://www.ncbi.nlm.nih.gov/pubmed/9951612 Since the first cell culture was set at the beginning of the twentieth century it was believed that all cultured cells, if provided with the proper conditions, would replicate indefinitely. Sixty years later we overthrew this dogma by finding that normal cells have a finite capacity to replicate and that only abnormal or cancer cell populations can replicate indefinitely. We interpreted these findings to bear on our understanding of the aging process. If, as had been previously thought, normal cells can replicate indefinitely, then age changes could not have an intracellular origin. Our findings demonstrated that, on the contrary, age changes do have an intracellular origin. The hundreds of changes that were subsequently found to precede the loss of replicative capacity have been interpreted to be age changes and the finitude of replication to be an expression of longevity determination. Subsequent findings by others have determined the molecular mechanism that governs the finitude of normal cell replicative capacity and how immortal cancer cells escape this inevitability. Experimental Gerontology 2003 38 11-12 1231–1241 Living forever and dying in the attempt 14698802 https://www.ncbi.nlm.nih.gov/pubmed/14698802 Quotes about Hayflick Geron's board was a Who's Who of telomere research, with a little biological stardust thrown in. It included Carol Greider (who ran a lab at Cold Spring Harbor Laboratory now), Woody Wright and Jerry Shay, Michael West's former mentors at the University of Texas; James Watson, the famed codiscoverer of the double helix; and, for historical, scientific, and even sentimental reasons, Leonard Hayflick. Stephen S. Hall: Merchants of Immortality: Chasing the Dream of Human Life Extension 2003 https://books.google.com/books?id=bs7ujLVb3NYC&q=who%27s#v=onepage&q=codiscoverer&f=false External links Category:1928 births Category:2024 deaths Category:Academics from the United States Category:Biologists from the United States Category:Educators from the United States Category:People from Philadelphia Category:Stanford University faculty