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Blood stem cell, leukemia link illuminated in UCSF-led study
Date:8/16/2010

A UCSF-led team has discovered at least one key reason why blood stem cells are susceptible to developing the genetic mutations that can lead to adult leukemia. Their finding also may explain, they say, why some other age-related hematological disorders develop.

The study, reported in "Cell Stem Cell" (Aug. 6, 2010) and reviewed in Cell Stem Cell and Cell, opens a new frontier for studying the molecular underpinnings of adult leukemia.

The discovery also suggests a possible therapeutic strategy, the scientists say, for reducing the risk of leukemia that results from chemotherapy used to treat solid tumors.

Finally, it may explain why other types of adult stem cells are susceptible to accumulating potentially lethal mutations.

Blood stem cells, located in the bone marrow, give rise to all blood cells of the body, such as red blood cells, white blood cells, and platelets. During fetal development, the stem cells specialize, or differentiate, into these various cell types. During life, they incessantly repeat the process, replacing old or depleted blood cells. The population also continuously self-renews.

Like most other adult stem cells, blood stem cells maintain a resting, or "quiescent," state when they are not differentiating or self-renewing. They do so to minimize stress caused by cellular respiration and errors in DNA replication, which can lead to DNA damage.

In the current study, conducted in the culture dish and mice, the team set out to determine if blood stem cells in the quiescent state were at greater risk for incurring genetic mutations in the process of repairing damaged DNA than were proliferating cells. Scientists have known that defects in DNA repair processes are associated with cancers, though they have known little about the mechanisms.

The team determined that both quiescent and proliferating blood stem cells have protective mechanisms ensuring their sur
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Contact: Jennifer O'Brien
jobrien@pubaff.ucsf.edu
415-502-6397
University of California - San Francisco
Source:Eurekalert

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