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(Journal of Leukocyte Biology. 2003;73:289-296.)
© 2003 by Society for Leukocyte Biology

Telomere shortening in leukocyte subpopulations from baboons

Gabriela M. Baerlocher*, Jennifer Mak*, Alexander Röth*, Karen S. Rice{dagger} and Peter M. Lansdorp*,{ddagger}

* Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, Canada;
{dagger} Department of Physiology and Medicine, Southwest Foundation for Biomedical Research, San Antonio, Texas; and
{ddagger} Department of Medicine, University of British Columbia, Vancouver, Canada

Correspondence: Peter M. Lansdorp, Terry Fox Laboratory, 601 West 10th Avenue, Vancouver, BC, V5Z 1L3, Canada. E-mail: plansdor{at}bccancer.bc.ca

To address questions about telomere length regulation in nonhuman primates, we studied the telomere length in subpopulations of leukocytes from the peripheral blood of baboons aged 0.2–26.5 years. Telomere length in granulocytes, B cells, and subpopulations of T cells all decreased with age. Overall, telomere length kinetics were lineage- and cell subset-specific. T cells showed the most pronounced, overall decline in telomere length. Levels of telomerase in stimulated T cells from old animals were lower than in corresponding cells from young animals. Memory T cells with very short telomeres accumulated in old animals. In contrast, the average telomere length values in B cells remained relatively constant from middle age onward. Individual B cells showed highly variable telomere length, and B cells with very long telomeres were observed after the ages of 1–2 years. In general, cell type-specific telomere kinetics in baboons were remarkably similar to those observed in humans.

Key Words: telomere length • replicative history • T lymphocytes • B lymphocytes • flow-FISH




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