Cited by 862Telomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model OrganismsNuclear Structure and Function

Activation of telomerase in human lymphocytes and hematopoietic progenitor cells

Hiyama, K, Hirai, Y, Kyoizumi, S, Akiyama, M, Hiyama, E, Piatyszek, M A, Shay, J W, Ishioka, S +1 more·1995·The Journal of Immunology

Abstract

This is the first report describing up-regulation of telomerase activity in human normal cells. Telomerase, a ribonucleoprotein enzyme, has been thought to be involved in maintaining telomere length stability in germline and most cancer cells, but not in normal cells. However, in the present study, we demonstrate that telomerase activity is detectable at low levels in normal human T and B cells, increases by in vitro mitogenic stimulation, increases in hematopoietic progenitor cells upon their proliferation and differentiation, and decreases with aging. Understanding the regulation of telomerase activity in normal cells may provide important insights not only into the mechanisms of normal cellular senescence but also into the mechanisms of telomerase activity deregulation as part of cancer development.

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Crossref · 10.4049/jimmunol.155.8.3711

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  • No significant adverse effects on normal tissues have been reported so far, even in hematopoietic cells, which may be highly susceptible to Telomelysin due to telomerase-positive stem cells.

    “Although we have to wait for the final report of the clinical trial, no significant adverse effects on normal tissues have been reported so far, even in hematopoietic cells, which may be highly susceptible to Telomelysin due to the presence of telomerase-positive stem cells. (35)”
  • Some normal cells, including some tissue stem cells, express relatively high levels of telomerase.

    “We should consider the fact that some normal cells, including some tissue stem cells, express relatively high levels of telomerase, (35,36,117) raising questions regarding the safety of Telomelysin.”

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Authors
Hiyama, K., Hirai, Y., Kyoizumi, S., Akiyama, M., Hiyama, E., Piatyszek, M. A., Shay, J. W., Ishioka, S., & Yamakido, M.
Affiliations
Hiroshima University (JP)
Venue
The Journal of Immunology
Published
1995-10
Volume
155
Issue
8
Pages
3711-3715
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1516272650
Cited by
853
References
0
Citations by year
2026: 1 · 2025: 4 · 2024: 2 · 2023: 10 · 2022: 6 · 2021: 11 · 2020: 9 · 2019: 13 · 2018: 11 · 2017: 8 · 2016: 13 · 2015: 15 · 2014: 17 · 2013: 20 · 2012: 17
FWCI
38.21
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Aging (AG07992, R01AG007992)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
Keywords
telomerase, telomerase activity, lymphocytes, T cells, B cells, hematopoietic progenitor cells, mitogen stimulation, aging, cellular senescence, telomere length, carcinogenesis, normal cells
MeSH terms
Adolescent, Adult, Aged, Aged, 80 and over, Aging, Base Sequence, Bone Marrow Cells, Cell Separation, Child, Child, Preschool, Enzyme Activation, Hematopoietic Stem Cells, Humans, Infant, Infant, Newborn, Leukocytes, Mononuclear, Lymphocyte Activation, Lymphocytes, Male, Middle Aged, Molecular Sequence Data, Telomerase

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