Worcester Polytechnic Institute Electronic Theses and Dissertations Collection

Title page for ETD etd-0430102-105910

Document Typethesis
Author NameMurthy, Vidya
Email Address vidyamurthy20 at hotmail.com
TitleTelomerase Activity in Human Umbilical Cord Cell Populations Containing Hematopoietic Stem Cells
DepartmentBiology & Biotechnology
  • David Adams, Advisor
  • Jill Rulfs, Committee Member
  • Keywords
  • Hematopoietic stem cells
  • Umbilbical cord blood
  • Date of Presentation/Defense2002-04-24
    Availability unrestricted


    Hematopoietic cell populations exhibiting detectable telomerase activity and elongated telomere lengths display strong engraftment survivability in humans during transplants. We investigated telomerase activity and telomere length in umbilical cord blood hematopoietic cell populations obtained from ViaCell Inc. at various intervals of a two-week ex vivo stem cell amplification process. Telomerase activity is increased with time in ViaCell’s amplification process, perhaps in response to the removal of differentiated cells and expansion of primitive hematopoietic stem cell populations in tissue culture media containing a mixture of growth factors. Two of ViaCell’s cell culture fractions were analyzed for telomere length using a TLA. Our results showed relatively long telomere lengths for day-0 and day-14 cord populations, and that despite an upregulation of telomerase activity in Day-14 samples, a loss of about 2 kb of telomeric DNA occurs. Our data are consistent with a model in which the increase in telomerase activity in day-14 ex vivo amplified cord blood hematopoietic cells relative to fresh cord is sufficient to reduce, but not prevent, telomere shortening caused by cell proliferation. Lastly, we investigated various culture conditions that could potentially upregulate telomerase activity in the Day-14 amplified cells. However none of the treatments tested altered telomerase activity. Our detection of increased telomerase activity and relatively long telomere lengths in ViaCell’s Day-14 ex vivo amplified cord blood stem cell fraction provides support for ViaCell’s Selective Clonogenic AmplificationTM indicating a high engraftment potential for these cells.

  • Murthy.pdf

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