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Karolak, Michele J; Guay, Justin A; Oxburgh, Leif
American journal of physiology. Renal physiology, 08/2018, Letnik: 315, Številka: 2Journal Article
Transforming growth factor-β (TGFβ) plays a central role in renal scarring, controlling extracellular matrix deposition by interstitial cells and mesangial cells. TGFβ signals through Smad and mitogen-activated protein kinase (MAPK) pathways. To understand the role of MAPK in interstitial and mesangial cells, we genetically inactivated TGFβ-activated kinase-1 ( Map3k7) using Foxd1 . Embryonic kidney development was unperturbed in mutants, but spontaneous scarring of the kidney ensued during the first postnatal week, with retention of embryonic nephrogenic rests and accumulation of collagen IV in the mesangium. MAPK signaling in the mesangium of mutant mice was skewed, with depressed p38 but elevated c-Jun NH -terminal kinase (JNK) activation at postnatal day 3. Despite normal expression of platelet-derived growth factor receptor-β (PDGFRβ) in the mesangium of mutants at birth, expression was lost concomitantly with the increase in JNK activation, and studies in isolated mesangial cells revealed that JNK negatively regulates Pdgfrβ. In summary, we show that MAP3K7 balances MAPK signaling in mesangial cells, suppressing postnatal JNK activation. We propose that the balance of MAPK signaling is essential for appropriate postnatal regulation of mesangial PDGFRβ expression.
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