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Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2025,1,14]]},"abstract":"<jats:p>\n                    Ataxia\u2013telangiectasia (A-T) is a pleiotropic genome instability syndrome resulting from the loss of the homeostatic protein kinase ATM. The complex phenotype of A-T includes progressive cerebellar degeneration, immunodeficiency, gonadal atrophy, interstitial lung disease, cancer predisposition, endocrine abnormalities, chromosomal instability, radiosensitivity, and segmental premature aging. Cultured skin fibroblasts from A-T patients exhibit premature senescence, highlighting the association between genome instability, cellular senescence, and aging. We found that lung fibroblasts derived from ATM-deficient mice provide a versatile experimental system to explore the mechanisms driving the premature senescence of primary fibroblasts lacking ATM.\n                    <jats:italic>Atm<\/jats:italic>\n                    \u2212\/\u2212 fibroblasts failed to proliferate under ambient oxygen conditions (21%). Although they initially proliferated under physiological oxygen levels (3%), they rapidly entered senescence. In contrast, wild-type (WT) lung fibroblasts did not senesce under 3% oxygen and eventually underwent immortalization and neoplastic transformation. However, rapid senescence could be induced in WT cells either by\n                    <jats:italic>Atm<\/jats:italic>\n                    gene ablation or persistent chemical inhibition of ATM kinase activity, with senescence induced by ATM inhibition being reversible upon inhibitor removal. Moreover, the concomitant loss of ATM and p53 led to senescence evasion, vigorous growth, rampant genome instability, and subsequent immortalization and transformation. Our findings reveal that the rapid senescence of\n                    <jats:italic>Atm<\/jats:italic>\n                    \u2212\/\u2212 lung fibroblasts is driven by the collaborative action of the cGAS\u2013STING, p38 MAPK, and p53 pathways in response to persistent DNA damage, ultimately leading to the induction of interferon-\u03b11 and downstream interferon-stimulated genes. We propose that accelerated cellular senescence may exacerbate specific A-T symptoms, particularly contributing to the progressive, life-threatening interstitial lung disease often observed in A-T patients during adulthood.\n                  <\/jats:p>","DOI":"10.1073\/pnas.2419196122","type":"journal-article","created":{"date-parts":[[2025,1,7]],"date-time":"2025-01-07T10:54:01Z","timestamp":1736247241000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":26,"title":["The cGAS\u2013STING, p38 MAPK, and p53 pathways link genome instability to accelerated cellular senescence in ATM-deficient murine lung fibroblasts"],"prefix":"10.1073","volume":"122","author":[{"given":"Majd","family":"Haj","sequence":"first","affiliation":[{"name":"Department of Human Molecular Genetics and Biochemistry, Faculty of Health & Medical Sciences, Tel Aviv University","place":["Tel Aviv, 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