Valve-like tissues may mimic inflammatory disease

Stem cell–derived tissues showed enhanced maturation and developed calcification-associated changes consistent with diseased human valve samples.

By
Andrea Surnit
August 19, 2026
4 min

MDSpire News

Objective:

To develop three-dimensional heart valve-like tissues from human pluripotent stem cells that mimic features of inflammatory heart valve disease and native human valves.

Approach:

Cell Line Testing: Three human pluripotent stem cell lines were used: PB522.3 iPSCs, PB10.5 iPSCs, and HES3 ESCs.
Tissue Engineering: Cells were incorporated into valve-engineered tissues (VET) in microVETs and macroVETs for various assessments.
Proteomic and Transcriptomic Analysis: Proteomic analysis compared 2D stem cell-derived cells with macroVETs, while transcriptomic analysis assessed gene expression.
Inflammatory Disease Modeling: MicroVETs were exposed to inflammatory cytokines to model inflammatory valve disease.
Biomechanical Assessment: MacroVETs were implanted subcutaneously in rats to evaluate biomechanical properties.

Key Findings:

85% of cells expressed the valve interstitial cell lineage marker SOX9 after 15 days.
3D culture promoted a more mature valve-like molecular profile with significant protein expression changes.
99.7% of native valve proteins were expressed in macroVETs.
Inflammatory cytokine exposure increased tissue tension and markers of extracellular matrix pathology.
MacroVETs showed no evidence of degradation or calcification in rat implantation studies.

Interpretation:

VETs serve as a platform for studying human valve development, maturation, and inflammatory disease.

Limitations:

VETs did not fully replicate native valve cellular composition, particularly with underrepresentation of valve endothelial cells.
The tissues lacked an organized endothelial layer and high levels of elastin.
Biomechanical properties of macroVETs were inferior to human aortic valves.