Abstract:
:Here, we show that the liver-derived apolipoprotein M (ApoM) protects the lung and kidney from pro-fibrotic insults and that this circulating factor is attenuated in aged mice. Aged mouse hepatocytes exhibit transcriptional suppression of ApoM. This leads to reduced sphingosine-1-phosphate (S1P) signaling via the S1P receptor 1 (S1PR1) in the vascular endothelial cells of lung and kidney. Suboptimal S1PR1 angiocrine signaling causes reduced resistance to injury-induced vascular leak and leads to organ fibrosis. Plasma transfusion from Apom transgenic mice but not Apom knockout mice blocked fibrosis in the lung. Similarly, infusion of recombinant therapeutics, ApoM-Fc fusion protein enhanced kidney and lung regeneration and attenuated fibrosis in aged mouse after injury. Furthermore, we identified that aging alters Sirtuin-1-hepatic nuclear factor 4α circuit in hepatocytes to downregulate ApoM. These data reveal an integrative organ adaptation that involves circulating S1P chaperone ApoM+ high density lipoprotein (HDL), which signals via endothelial niche S1PR1 to spur regeneration over fibrosis.
journal_name
Dev Celljournal_title
Developmental cellauthors
Ding BS,Yang D,Swendeman SL,Christoffersen C,Nielsen LB,Friedman SL,Powell CA,Hla T,Cao Zdoi
10.1016/j.devcel.2020.05.024subject
Has Abstractpub_date
2020-06-22 00:00:00pages
677-690.e4issue
6eissn
1534-5807issn
1878-1551pii
S1534-5807(20)30413-5journal_volume
53pub_type
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