| First Author | Zhou J | Year | 2022 |
| Journal | Aging Cell | Volume | 21 |
| Issue | 8 | Pages | e13680 |
| PubMed ID | 35906886 | Mgi Jnum | J:345340 |
| Mgi Id | MGI:7331705 | Doi | 10.1111/acel.13680 |
| Citation | Zhou J, et al. (2022) Sirt1 overexpression improves senescence-associated pulmonary fibrosis induced by vitamin D deficiency through downregulating IL-11 transcription. Aging Cell 21(8):e13680 |
| abstractText | Determining the mechanism of senescence-associated pulmonary fibrosis is crucial for designing more effective treatments for chronic lung diseases. This study aimed to determine the following: whether Sirt1 and serum vitamin D decreased with physiological aging, promoting senescence-associated pulmonary fibrosis by activating TGF-beta1/IL-11/MEK/ERK signaling, whether Sirt1 overexpression prevented TGF-beta1/IL-11/MEK/ERK signaling-mediated senescence-associated pulmonary fibrosis in vitamin D-deficient (Cyp27b1(-/-) ) mice, and whether Sirt1 downregulated IL-11 expression transcribed by TGF-beta1/Smad2 signaling through deacetylating histone at the IL-11 promoter in pulmonary fibroblasts. Bioinformatics analysis with RNA sequencing data from pulmonary fibroblasts of physiologically aged mice was conducted for correlation analysis. Lungs from young and physiologically aged wild-type (WT) mice were examined for cell senescence, fibrosis markers, and TGF-beta1/IL-11/MEK/ERK signaling proteins, and 1,25(OH)2 D3 and IL-11 levels were detected in serum. Nine-week-old WT, Sirt1 mesenchymal transgene (Sirt1(Tg) ), Cyp27b1(-/-) , and Sirt1(Tg) Cyp27b1(-/-) mice were observed the pulmonary function, aging, and senescence-associated secretory phenotype and TGF-beta1/IL-11/MEK/ERK signaling. We found that pulmonary Sirt1 and serum vitamin D decreased with physiological aging, activating TGF-beta1/IL-11/MEK/ERK signaling, and promoting senescence-associated pulmonary fibrosis. Sirt1 overexpression improved pulmonary dysfunction, aging, DNA damage, senescence-associated secretory phenotype, and fibrosis through downregulating TGF-beta1/IL-11/MEK/ERK signaling in Cyp27b1(-/-) mice. Sirt1 negatively regulated IL-11 expression through deacetylating H3K9/14ac mainly at the region from -871 to -724 of IL-11 promoter, also the major binding region of Smad2 which regulated IL-11 expression at the transcriptional level, and subsequently inhibiting TGF-beta1/IL-11/MEK/ERK signaling in pulmonary fibroblasts. This signaling in aging fibroblasts could be a therapeutic target for preventing senescence-associated pulmonary fibrosis induced by vitamin D deficiency. |
