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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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BackgroundInfluentialEstrogen reduces endothelial progenitor cell senescence through augmentation of telomerase activity
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“(294) have shown that telomerase activity is detectable at very low levels in normal human T and B cells and that it increases greatly after mitogenic stimulation.”
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Self-citationTelomere biology in mammalian germ cells and during development
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“Cells were resuspended in 10 ml of 20% fetal bovine serum (FBS) in 1640 RPMI Glutamax media (Life Technologies, Invitrogen, Carlsbad, CA, USA) supplemented with antibiotics (penicillin and streptomycin) and counted (20).”
BackgroundMethodInfluentialSelf-citationGetting to the end: telomerase access in yeast and humans
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“In contrast, telomerase activity is very low or absent in somatic cells, although telomerase activity has been found in normal human blood cells, proliferative basal skin layer, endometrial tissue, intestinal crypt proliferative zone, and hair follicles (40-44).”
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“Low amounts of telomerase activity in normal human tissues were found only in hematopoietic progenitor cells and activated T- and Blymphocytes [41]; in germ cells, ovaries, and testes [42]; and in physiologically regenerating epithelial cells [43].”
Accelerated telomere shortening and telomerase activation in Fanconi's anaemia
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“Telomerase activity in PBMC cells Telomerase, the enzyme that counteracts telomere shortening, has been shown to be present in most normal haemopoietic cells (Hiyama et al, 1995).”
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Andrews, N. P., Fujii, H., Goronzy, J. J., & Weyand, C. M. (2010) · Gerontology · doi:10.1159/000268620 · Cited by 108
“Lymphocytes have a unique requirement for clonal expansion that necessitates robust proliferative capacity. To circumvent growth arrest due to replication-associated telomere loss, immune cells maintain their chromosome ends via telomerase induction during entry into the cell cycle. Early studies described very low to…”
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“In contrast, telomerase is restricted to a few normal cell types in humans, including germ cells, stem cells, activated lymphocytes and epithelial cells with high reproductive demand.(10-14) Additionally, during the germinal center (GC) reaction in lymph nodes high levels of telomerase activity is expressed in the GC…”
BackgroundCorneal endothelial regeneration and tissue engineering
Mimura, T., Yamagami, S., & Amano, S. (2013) · Progress in Retinal and Eye Research · doi:10.1016/j.preteyeres.2013.01.003 · Cited by 119
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“In humans, telomerase is active in the germline, early in embryogenesis, in stem cells, and following stimulation of an immune response (8,9).”
BackgroundInfluentialVariation at theTERTlocus and predisposition for cancer
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Telomere biology in human aging and aging syndromes
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“Telomere length homeostasis is maintained by hTERT activity (39), primarily in germ cells, white blood cells (WBCs), and adult stem cell compartments (25, 27, 34).”
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“The telomerase complex, a reverse transcriptase enzyme complex, maintains telomeres during DNA replication [35-37], thereby preventing genomic instability and cellular senescence.”
BackgroundTelomere and adaptive immunity
Weng, N.-P. (2008) · Mechanisms of Ageing and Development · doi:10.1016/j.mad.2007.11.005 · Cited by 99
“Like T cells, telomerase is not expressed in resting B cells but is rapidly activated after mitogenic stimulation (Hiyama et al., 1995; Weng et al., 1997a).”
Mitochondria, Telomeres and Telomerase Subunits
Zheng, Q., Huang, J., & Wang, G. (2019) · Frontiers in Cell and Developmental Biology · doi:10.3389/fcell.2019.00274 · Cited by 118
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“For the first time, this allowed a direct comparison of the activity of this enzyme in cycling CD4 T cells from both blood and blister at different times after stimulation (30, 31).”
BackgroundMethodTelomeres, Telomerase and Ageing
Saretzki, G. C. (2018) · Sub-cellular biochemistry/Subcellular biochemistry · doi:10.1007/978-981-13-2835-0_9 · Cited by 120
Maini, M. K., Soares, M. V. D., Zilch, C. F., Akbar, A. N., & Beverley, P. C. L. (1999) · The Journal of Immunology · doi:10.4049/jimmunol.162.8.4521 · Cited by 110
“Telomerase activity has been demonstrated at very low levels in circulating lymphocytes of healthy individuals with the highly sensitive PCR-based TRAP technique, with the amount detected being inversely related to donor age (12).”
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“Our observation of full activation of telomerase activity in NK-92 cells 24 h after stimulation with IL-2 is compatible with previous findings in PBLs stimulated with mitogen (5, 12, 13, 18).”
ResultTelomere Length, Aging, and Somatic Cell Turnover
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“Detectable telomerase activity is observed only in some highly regenerative tissues such as hematopoietic progenitor, intestinal crypt, skin basal layer, cervical keratinocyte, endometrium, and germ line cells; however, 75 to 85% of cancer cells show telomerase activity (9, 13, 16 , 21, 23, 25, 37, 43).”
BackgroundSelf-citationInterplay between telomere length and telomerase in human leukocyte differentiation and aging
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BackgroundTelomerase activity and the expression of telomerase components in acute myelogenous leukaemia
Xu, D., Gruber, A., Peterson, C. O., & Pisa, P. (1998) · British Journal of Haematology · doi:10.1046/j.1365-2141.1998.00969.x · Cited by 107
Telomerase Activity Does Not Always Imply Telomere Maintenance
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Telomere Length Dynamics in Telomerase-Positive Immortal Human Cell Populations
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Self-citationEstimating human hematopoietic stem cell kinetics using granulocyte telomere lengths
Shepherd, B. E., Guttorp, P. M., Lansdorp, P. M., & Abkowitz, J. L. (2004) · Experimental Hematology · doi:10.1016/j.exphem.2004.07.023 · Cited by 105
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“Occasional studies have detected extremely low levels of telomerase in neutrophils (Broccoli et al, 1995) but others have not (Hiyama et al, 1995), and differentiation studies have demonstrated inhibition of telomerase activity as the mature myeloid phenotype is reached (Sharma et al, 1995).”
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Self-citationTelomeres and telomerase in normal and malignant haematopoietic cells
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Telomerase in T Lymphocytes: Use It and Lose It?
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“Telomerase activity is extremely low or absent in unstimulated human peripheral blood T cells, but activation in vitro induces high levels of enzymic activity but only a modest increase in hTERT expression (2, 15, 23).”
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“Unstimulated B cells from peripheral blood and tonsils have been reported to express low or undetectable levels of telomerase (Broccoli et al, 1995; Hiyama et al, 1995; Norrback et al, 2001).”
BackgroundEvidence for UV-associated activation of telomerase in human skin.
Ueda, M., Ouhtit, A., Bito, T., Nakazawa, K., Lübbe, J., Ichihashi, M., Yamasaki, H., & Nakazawa, H. (1997) · PubMed · Cited by 95
Is telomerase activity in cancer due to selection of stem cells and differentiation arrest?
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Multiple pathways for the regulation of telomerase activity
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“Mitogen stimulation of immune cells increases telomerase activity in T cells [107], suggesting that telomerase activity may be increased in long-term exercise-trained individuals in order to maintain telomere length following the repeated proliferative stress of strenuous exercise.”
BackgroundTelomerase in Cancer: Function, Regulation, and Clinical Translation
Robinson, N. J., & Schiemann, W. P. (2022) · Cancers · doi:10.3390/cancers14030808 · Cited by 105
“It should be noted that, while telomerase is not widely expressed throughout the body, its activity is maintained by tissue-resident stem cell populations, including hematopoietic [221], intestinal [222], and germline [223].”
BackgroundNormal mammalian cells negatively regulate telomere length by telomere trimming
Pickett, H. A., Henson, J. D., Au, A. Y. M., Neumann, A. A., & Reddel, R. R. (2011) · Human Molecular Genetics · doi:10.1093/hmg/ddr402 · Cited by 100
“Telomerase activity is repressed or tightly controlled in most normal human somatic cells, but is readily detectable in activated lymphocytes (15).”
Telomerase Activity in Benign and Malignant Thyroid Tumors
Haugen, B. R., Nawaz, S., Markham, N. E., et al. (1997) · Thyroid · doi:10.1089/thy.1997.7.337 · Cited by 93
Telomerase Regulation, Cell Cycle, and Telomere Stability in Primitive Hematopoietic Cells
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“Lowlevel telomerase activity has also been demonstrated in normal human T and B cells, which was also shown to decrease with aging ( 17 ).”
Using naturally occurring tumours in dogs and cats to study telomerase and cancer stem cell biology
Pang, L. Y., & Argyle, D. J. (2009) · Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease · doi:10.1016/j.bbadis.2009.02.010 · Cited by 92
“In fact, low levels of telomerase activity have been found in some human adult stem cell compartments, including hematopoietic stem cells (HSCs) [42-44] and intestinal stem and progenitor cells in basal crypts [45].”
BackgroundNiwa, O., Barcellos‐Hoff, M. H., Globus, R. K., Harrison, J. D., Hendry, J. H., Jacob, P., Martin, M. T., Seed, T. M., Shay, J. W., Story, M. D., et al. (2015) · Annals of the ICRP · doi:10.1177/0146645315595585 · Cited by 91
Self-citationCurrent molecular aspects of the carcinogenesis of the uterine endometrium
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Telomerase activation: one step on the road to cancer?
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“In normal adult tissues, telomerase is most active in long-lived stem cells and progenitors, and then progressively decreases in more differentiated progeny [22–24].”
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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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