{
  "id": 10465760,
  "title": "Myeloid Ecotropic Viral Integration Site 1 Promotes Vascular Smooth Muscle Differentiation through Activation of Myocardin",
  "url": "https://urgent.news/2026/09/28/myeloid-ecotropic-viral-integration-site-1-promotes-vascular-smooth",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-28T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.26.751066v1?rss=1"
  },
  "original_language": "en",
  "account": "Myocardin, also known as MYOCD, is crucial in regulating vascular smooth muscle cell (VSMC) growth arrest and differentiation. Previous research has examined MYOCD's role in this process, but its transcriptional regulation remains largely unknown. In a recent study, researchers discovered moderate levels of Myeloid Ecotropic viral Integration Site 1 (MEIS1) mRNA in human and mouse VSMCs. Notably, MEIS1 expression decreased when MYOCD levels also decreased, both of which are associated with VSMC de-differentiation.\n\nTo further investigate the relationship between MEIS1 and MYOCD, the researchers conducted loss- and gain-of-MEIS1 expression studies in cultured human VSMCs and the mouse carotid artery. The findings indicated that MEIS1 functions as an activator of MYOCD and promotes VSMC differentiation. Additionally, CRISPR-mediated knockout of the endogenous MEIS1 gene in vitro led to lower levels of VSMC contractile markers and increased growth rates. In mice deficient in MEIS1, femoral artery wire injury resulted in enhanced neointima formation.\n\nThe researchers identified a conserved MEIS1 response element within the proximal promoter of MYOCD, which appears to contribute to the promoter activity. This suggests a potential regulatory interaction between MEIS1 and MYOCD, shedding light on a previously unrecognized role for the homeodomain protein MEIS1 in the activation of MYOCD and the quiescent, VSMC differentiated state.",
  "summary": "Myocardin (MYOCD) is the principal trigger-switch for vascular smooth muscle cell (VSMC) growth arrest and the cyto-contractile program of differentiation. While much is known about MYOCD-dependent VSMC differentiation, limited information exists as to its transcriptional regulation. Here, we report moderate mRNA expression of Myeloid Ecotropic viral Integration Site 1 (MEIS1) in both human and…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}