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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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Self-citationTelomerase is Not an Epidermal Stem Cell Marker and is Downregulated by Calcium
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Telomerase Maintains Telomere Structure in Normal Human Cells
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Shared Phenotypes Among Segmental Progeroid Syndromes Suggest Underlying Pathways of Aging
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“highly replicative cells of skin (11), gastrointestinal tractstomach-intestine (12), bone marrow (13), testes (14), and generally in all systems affected in the telomerase disorder, Dyskeratosis Congenita.”
BackgroundSelf-citationTelomere Length Dynamics and the Evolution of Cancer Genome Architecture
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“Moreover, detection of telomerase activity in clinical materials without in situ analysis may cause a false positive due to the infiltrated lymphocytes (16).”
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Telomeres in Plants and Humans: Not So Different, Not So Similar
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“Furthermore, this reduced cycling minimizes the uncapping of telomeres during replication (35-37) and telomeres are further protected in stem cells by the expression of telomerase (36, 38, 39).”
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“In the latter, telomerase activity is readily detectable in lymphocytes,((8)) which need to undergo rapid expansion, and in stem cells.((9,10)) Nevertheless there is evidence that telomeres do shorten during replicative aging of”
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“Telomerase activity is increased in stem cells, but also in lymphocytes, where it is the highest in the germinal center (122, 123).”
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“Previous studies have shown that activated T cells undergo up-regulation of hTERT mRNA expression and of telomerase activity (3, 16, 19, 39).”
BackgroundTelomere biology in hematopoiesis and stem cell transplantation
Gadalla, S. M., & Savage, S. A. (2011) · Blood Reviews · doi:10.1016/j.blre.2011.06.004 · Cited by 60
Decline in telomerase activity as a measure of tumor cell killing by antineoplastic agents in vitro.
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Self-citationTelomerase activity in the differential diagnosis of papillary carcinoma of the thyroid
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“Absent from most of normal somatic cells, with exception of germ cells, stem cells and activated haematopoietic (Hiyama et al, 1995), telomerase is expressed in most tumou lines and in a majority of cancer.”
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“As mentioned above, telomerase activity is present in both naive and memory B cells, but is further up-regulated in the GC [32, 36, 51, 67].”
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“Second, since samples contain normal lymphocytes with potential telomerase activity [34], telomerase activity may arise from normal lymphocytes.”
BackgroundGlass, M. C., & Delany, M. E. (2016) · Poultry Science · doi:10.3382/ps/pev369 · Cited by 56
“Telomerase is not detected in somatic cells but is highly active in stem cells, germ line cells, and lymphocytes in humans (Hiyama et al., 1995).”
The Immune Response Against Human Cytomegalovirus Links Cellular to Systemic Senescence
Heath, J., & Grant, M. D. (2020) · Cells · doi:10.3390/cells9030766 · Cited by 57
“Lymphocytes are unique among differentiated cells in their capacity to upregulate telomerase upon activation, but this capacity is gradually lost upon repeated cycles of activation [16,17].”
BackgroundGenes, telomeres and mammalian ageing
Goyns, M. H. (2002) · Mechanisms of Ageing and Development · doi:10.1016/s0047-6374(01)00424-9 · Cited by 54
Nuclear and territorial topography of chromosome telomeres in human lymphocytes
Amrichová, J., Lukášová, E., Kozubek, S., et al. (2003) · Experimental Cell Research · doi:10.1016/s0014-4827(03)00208-8 · Cited by 54
“can be significantly stimulated after in vitro stimulation with mitogen [69–71].”
BackgroundImpaired telomerase activity in uninfected haematopoietic progenitors in HIV-1-infected patients
Vignoli, M., Stecca, B. A., Furlini, G., Re, M. C., Mantovani, V., Zauli, G., Visani, G., Colangeli, V., & Plaça, M. L. (1998) · AIDS · doi:10.1097/00002030-199809000-00006 · Cited by 54
Telomerase activity in benign and malignant thyroid diseases
Yashima, K., Vuitch, F., Gazdar, A. F., & Fahey, T. J. (1997) · Surgery · doi:10.1016/s0039-6060(97)90220-8 · Cited by 53
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Comparative Functional Study of the Viral Telomerase RNA Based on Natural Mutations
Trapp-Fragnet, L., Kut, E., & Rasschaert, D. (2005) · Journal of Biological Chemistry · doi:10.1074/jbc.m501163200 · Cited by 53
Ziegler, S. M., Schettgen, T., Beier, F., Wilop, S., Quinete, N., Esser, A., Masouleh, B. K., Ferreira, M. S. V., Vankann, L., Uciechowski, P., et al. (2016) · Archives of Toxicology · doi:10.1007/s00204-016-1725-8 · Cited by 52
“After activation, T cells undergo proliferation and continued expansion, which is accompanied by the upregulation of telomerase (tert), the telomere elongating enzyme (Hiyama et al. 1995).”
Fujita, Y., Fujikane, T., Fujiuchi, S., Nishigaki, Y., Yamazaki, Y., Nagase, A., Shimizu, T., Ohsaki, Y., & Kikuchi, K. (2003) · Cancer · doi:10.1002/cncr.11611 · Cited by 52
“In addition, telomerase activity is detectable at low levels in activated human T cells and B cells.(13) Evaluation of telomerase activity in bronchoalveolar lavage fluid (BALF) reportedly is useful as a screening method for detecting internal malignancies.”
BackgroundSato, R., Maesawa, C., Fujisawa, K., Wada, K., Oikawa, K., Takikawa, Y., Suzuki, K., Oikawa, H., Ishikawa, K., & Masuda, T. (2004) · Gut · doi:10.1136/gut.2003.027516 · Cited by 52
“36 37 Only endometrial tissue exhibits a menstrual phase dependent regulation of TA; upregulation of TA is observed during the proliferative phase (high oestradiol phase) but inhibited during the midsecretory phase (low oestradiol phase).”
Background
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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