Sergio Armando Villalta

Sergio Armando Villalta is an Assistant Professor in the Department of Physiology & Biophysics and the Department of Neurology at the University of California, Irvine (UCI) School of Medicine. His research focuses on elucidating the role of macrophages in skeletal muscle homeostasis and fibrosis, particularly in the context of muscular dystrophy and chronic inflammation.

Using advanced techniques such as single-cell transcriptomics (scRNAseq), spatial transcriptomics, and computational modeling of intercellular communication, Villalta and his collaborators have identified a novel macrophage subset characterized by high expression of fibrotic factors like galectin-3 (Lgals3) and osteopontin (Spp1). This work demonstrates that these macrophages are chronically activated in dystrophic muscle and play a key role in regulating stromal progenitor cell differentiation through Spp1 signaling. Their findings also reveal elevated levels of gal-3+ macrophages in human myopathies, suggesting translational relevance.

His research has been supported by multiple NIH grants, including R01 AI168063, P30 AR075047, and R01 NS120060. These grants enable investigations into immune-muscle interactions, fibrosis mechanisms, and potential therapeutic targets.