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Activation of telomerase in human lymphocytes and hematopoietic progenitor cells
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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“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)”
From Understanding and exploiting hTERT promoter regulation for diagnosis and treatment of human cancers (2008) · cites this paper as [35]
In the citing paper
“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.”
From Understanding and exploiting hTERT promoter regulation for diagnosis and treatment of human cancers (2008) · cites this paper as [35]
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Items 801–859 of 859
Entwicklung eines neuen Assays zum Nachweis der humanen Telomerase
Dimitrova, L. (2009) · doi:10.18452/15875
“Normale humane Telomerase-positive Zelltypen sind stimulierte Lymphozyten [157,158,159], das Darmepithel [160], das Speiseröhren-Epithel [161], das periodische Endometrium [162,163,164], basale Keratinozyten [165,166], das zervikale Epithel [166], blutbildende Stammzellen [167] sowie die Keimzellen in Ovarien und Test…”
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Gil, M. E. (2013) · University of the Witwatersrand, Johannesburg Institutional Repository on DSpace (University of the Witwatersrand, Johannesburg)
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“TERT is expressed in most cancer cells, some adult stem cells, and some proliferating cells such as human T and B cells (Hiyama et al., 1995).”
BackgroundTelomere length in cardiovascular disease and type 2 diabetes
Salpea, K. D. (2011) · UCL Discovery (University College London)
Deng, W.-A., Zheng, Z.-M., & Wei, S.-Z. (2016) · INFM-OAR (INFN Catania) · doi:10.5281/zenodo.187190
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“Thus, higher telomerase activity can be detected in bone marrow (BM) CD34+CD38+ committed progenitor cell fraction than in the CD34+CD38−/low fraction containing primitive hematopoietic progenitor cells (Hiyama et al. 1995).”
BackgroundThe Senescent Cell Induced Bystander Effect
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Diagnostic Value I: Solid Tumors
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Self-citationTelomerase activity in human germline and embryonic tissues and cells
Wright, W. E., Piatyszek, M. A., Rainey, W. E., Byrd, W., & Shay, J. W. (1996) · Developmental Genetics · doi:10.1002/(sici)1520-6408(1996)18:2
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Self-citation
Metadata
- 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
- Publisher
- Oxford University Press (OUP)
- 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
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › 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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