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Prepublished online as a Blood First Edition Paper on March 27, 2003; DOI 10.1182/blood-2002-07-2334.
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Blood, 15 July 2003, Vol. 102, No. 2, pp. 517-520
HEMATOPOIESIS
Brief report
Telomerase is required to slow telomere shortening and extend replicative lifespan of HSCs during serial transplantation
Richard C. Allsopp,
Gregg B. Morin,
Ronald DePinho,
Calvin B. Harley, and
Irving L. Weissman
From the Beckman Center, Pathology Department, Stanford University School of Medicine, CA; Geron, Menlo Park, CA; and the Dana-Farber Cancer Institute, Harvard University, Boston, MA.
Telomere shortening ultimately limits the replicative life span of cultured human somatic cells. Telomeres also shorten during replicative aging in vivo in hematopoietic cells, including early hematopoietic progenitors and hematopoietic stem cells (HSCs), from humans and mice, despite readily detectable levels of telomerase in these cells. To assess the relevance of telomerase to the long-term replicative capacity of HSCs in vivo, we serially transplanted HSCs from wild-type and telomerase-deficient mice until exhaustion and monitored telomere length in HSCs during this process. Telomerase-deficient HSCs could be serially transplanted for only 2 rounds, whereas wild-type HSCs could be serially transplanted for at least 4 rounds. Furthermore, the rate of telomere shortening was increased approximately 2-fold during serial transplantation of telomerase-deficient HSCs. These findings suggest that one role for telomerase in the HSC is to partially counter the rate of telomere shortening during division of HSCs, thereby preventing premature loss of telomere function and providing added replicative capacity.
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