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- Title
Telomerase activity is required for bleomycin-induced pulmonary fibrosis in mice.
- Authors
Liu, Tianju; Chung, Myoung Ja; Ullenbruch, Matthew; Yu, Hongfeng; Jin, Hong; Hu, Biao; Choi, Yoon Young; Ishikawa, Fuyuki; Phan, Sem H
- Abstract
In addition to its well-known expression in the germline and in cells of certain cancers, telomerase activity is induced in lung fibrosis, although its role in this process is unknown. To identify the pathogenetic importance of telomerase in lung fibrosis, we examined the effects of telomerase reverse transcriptase (TERT) deficiency in a murine model of pulmonary injury. TERT-deficient mice showed significantly reduced lung fibrosis following bleomycin (BLM) insult. This was accompanied by a significant reduction in expression of lung alpha-SMA, a marker of myofibroblast differentiation. Furthermore, lung fibroblasts isolated from BLM-treated TERT-deficient mice showed significantly decreased proliferation and increased apoptosis rates compared with cells isolated from control mice. Transplantation of WT BM into TERT-deficient mice restored BLM-induced lung telomerase activity and fibrosis to WT levels. Conversely, transplantation of BM from TERT-deficient mice into WT recipients resulted in reduced telomerase activity and fibrosis. These findings suggest that induction of telomerase in injured lungs may be caused by BM-derived cells, which appear to play an important role in pulmonary fibrosis. Moreover, TERT induction is associated with increased survival of lung fibroblasts, which favors the development of fibrosis instead of injury resolution.
- Subjects
ANIMAL experimentation; ANTIGENS; ANTINEOPLASTIC antibiotics; APOPTOSIS; BIOLOGICAL models; BLEOMYCIN; BONE marrow transplantation; CELL physiology; COMPARATIVE studies; FIBROBLASTS; GENES; LUNGS; RESEARCH methodology; MEDICAL cooperation; MICE; MUSCLE proteins; PULMONARY fibrosis; RESEARCH; TRANSFERASES; TUMORS; EVALUATION research
- Publication
Journal of Clinical Investigation, 2007, Vol 117, Issue 12, p3800
- ISSN
0021-9738
- Publication type
journal article