Abstract
Kidney repair after acute kidney injury ( AKI ) relies on a finely tuned extracellular matrix ( ECM ) that provides structural integrity and mechanical cues. As primary ECM architects, fibroblasts and pericytes rapidly mobilize to the injury site post-AKI, yet the ECM-driven repair mechanisms remain incompletely defined. Here, leveraging tissue engineering, genetic and pharmacological models, and multi-omics, we profiled the proteome landscape of decellularized kidney matrix scaffold post-AKI and highlighted microfibrillar-associated protein 2 ( Mfap2 ) as a key core matrisome component primarily sourced from fibroblasts and pericytes. Mfap2 loss disrupted kidney architecture and metabolism, aggravating AKI. Global proteomics revealed that Mfap2 deficiency suppressed tubular 3-hydroxy-3-methylglutaryl-CoA synthase 2 ( Hmgcs2 ) expression via estrogen receptor 2 ( Esr2 )-mediated transcriptional repression and increased protein succinylation. Phosphoproteomics and spatial transcriptomics further demonstrated a shift in mechanical signaling, with Mfap2 loss hyperactivating mitogen-activated protein kinases and upregulating large tumor suppressor kinase 1 ( Lats1 ) in tubular cells without altering integrin receptor activities. In turn, Lats1 suppressed Esr2 transcription independent of its canonical Yap/Taz effectors, without affecting ubiquitin-mediated Esr2 degradation. Therapeutically, Esr2 agonists restored kidney function in Mfap2-deficient models. These findings position Mfap2 as a key regulator of ECM dynamics and mechanosignaling, linking tissue stiffness to metabolic reprogramming required for kidney repair.