{
  "id": 8332808,
  "title": "Ultrastructural and Proteomic Signatures of Mechanoadaptive Fibroblast Remodeling across Microphysiological and Mesoscale Shear Platforms",
  "url": "https://urgent.news/2026/09/18/ultrastructural-and-proteomic-signatures-of-mechanoadaptive",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-18T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.13.751238v1?rss=1"
  },
  "original_language": "en",
  "account": "The study explores the impact of mechanical cues on fibroblast behavior in the context of inflammatory bowel disease (IBD). Researchers utilized a microfluidic gut-on-a-chip microphysiological system and a mesofluidic rotary shaker to investigate how shear stress affects normal human intestinal fibroblasts. The results showed that sustained fluid shear stress alone could induce a permanent, profibrotic phenotypic transformation in these cells.\n\nThe fibroblasts from both the small and large intestine were able to self-organize into three-dimensional (3D) multicellular aggregates within 72 hours, regardless of the delivery format of shear stress. This suggests that the transition is driven by mechanical force rather than the specific geometry of the device. Upon transition, the fibroblasts showed increased -smooth muscle actin (-SMA) expression and the formation of aligned stress fibers.\n\nUnder scanning electron microscopy (SEM), the researchers observed a densely packed cellular microarchitecture embedded in a microfibrillar extracellular network. Ultrastructural serial block-face 3D electron microscopy revealed expansive intercellular spaces, random fibrillar extrusions, and electron-dense cytoplasmic material at cell boundaries. Proteomic analysis confirmed the enrichment of core matrisome components such as collagen subtypes and matrix metalloproteinases.\n\nOverall, these findings establish fluid shear stress as a universally effective mechanical trigger for fibroblast remodeling, making microphysiological shear platforms valuable tools for studying and potentially intervening in early stages of fibrogenesis in IBD.",
  "summary": "Mechanobiological cues in the tissue microenvironment increasingly drive pathological fibroblast activation in inflammatory bowel disease (IBD), yet engineered platforms modeling this transition remain limited. Here, a microfluidic gut-on-a-chip microphysiological system and a mesofluidic rotary shaker are used to demonstrate that sustained fluid shear stress alone is necessary and sufficient to…",
  "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."
}