Multiomics Analysis Reveals Stromal Cell State Changes and INHBA-Associated Remodeling in Calcific Aortic Valve Disease.

BACKGROUND

The cellular and molecular mechanisms underlying calcific aortic valve disease (CAVD) remain incompletely understood. Emerging evidence suggests that signaling components active during valve development may also be relevant to disease-associated remodeling, although their context-specific roles remain unclear.

METHODS

We integrated multiomics data, including genome-wide association study summary data, single-cell RNA sequencing from fetal, healthy adults, and CAVD valves, and bulk RNA-sequencing data sets to identify the CAVD-relevant cell populations and candidate genes. Then, an in vitro calcification model of valvular interstitial cells (VICs) was used to assess the role of INHBA (inhibin subunit βA) in VIC calcification and to examine its expression in an in vivo CAVD model.

RESULTS

Our single-cell analysis revealed stage-associated changes in valve cell composition across fetal, healthy, and CAVD conditions. VICs and valve-derived stromal cells (VDSCs) showed closely connected transcriptional states. Specifically, fetal VIC subpopulations, including VIC3 and VIC5, shifted toward adult VIC2 and VDSC2, and ultimately toward VDSC1-enriched states in CAVD. VDSC1 was consistently enriched in CAVD and showed enrichment of inflammation-related and extracellular matrix remodeling-related pathways. Cell-cell communication analysis showed significantly enhanced interactions between VDSC1 and macrophages in CAVD, consistent with increased inflammatory signaling in the local microenvironment. Integrated analysis of genome-wide association study, bulk RNA sequencing, and single-cell RNA sequencing identified 21 candidate genes associated with CAVD. Among these, INHBA showed stage-dependent expression across valve conditions. In vitro, INHBA expression increased during osteogenic induction of VICs, along with elevated RUNX2 (runt-related transcription factor 2) and ALP (alkaline phosphatase), whereas INHBA silencing reduced calcification. In vivo, INHBA expression also differed across fetal, healthy, and calcified valves.

CONCLUSIONS

Those findings define stage-associated shifts in VIC and VDSC subpopulations across valve conditions and identify VDSC1 enrichment as a prominent feature of CAVD. Our data further implicate INHBA in osteogenic remodeling of VICs and support further evaluation of INHBA in disease-associated remodeling in CAVD.