Author: Hellyeh Hamidi

Increased extracellular matrix deposition and stiffness promotes solid tumour progression. Yet, the precise mechanotransduction pathways, especially in less-studied mechanically responsive cancers, remain poorly understood. Here we address this gap using patient-derived tumour cells from early (mobile, T1) and advanced (immobile, T3) stages of vocal fold cancer, the most common squamous…

The rapid, transient, and unpredictable nature of interactions between circulating cells and the endothelium challenges the investigation of these events under flow conditions. Here, we developed an imaging and image-analysis framework called FlowVision, which integrates fast, bright-field live-cell imaging with deep-learning-based image analysis to quantitatively track cell landing and arrest…

Constitutive integrin endocytosis and recycling control cell movement and morphology. In contrast, the role of newly synthesized integrins delivered via the biosynthetic pathway has been largely overlooked. We used the retention using selective hooks system to monitor the localization of new integrins exiting the endoplasmic reticulum in space and time.

Contractile actomyosin bundles, stress fibers, are important for cell migration, adhesion, morphogenesis, and mechanosensing. Calponin (CNN) family proteins are abundant stress fiber components, but their cellular functions and isoform-specific roles remain poorly understood. By depleting the three CNN isoforms (calponin-1 [CNN1], calponin-2 [CNN2], and calponin-3 [CNN3]) individually and collectively from…

Formation of the skin barrier is essential for organismal survival and tissue homeostasis. Barrier formation requires positioning of functional tight junctions (TJs) to the most suprabasal viable layer of the epidermis through a mechanical circuit that is driven by generation of high tension at adherens junctions. However, what allows the…

Mitochondria have a crucial role in regulating cellular homeostasis in response to intrinsic and extrinsic cues by changing cellular metabolism to meet these challenges. However, the molecular underpinnings of this regulation and the complete spectrum of these physiological outcomes remain largely unexplored. In this study, we elucidate the mechanisms driving…

Integrin β1-mediated adhesion is dispensable in early mouse embryogenesis (pre-implantation) but indispensable post-implantation, suggesting distinct roles for β1-integrin-mediated adhesions in the naive (pre-implantation) versus primed (post-implantation) pluripotent stem cells (PSCs). We investigated the role of integrin β1 in regulating naive-like and primed human induced PSC (hiPSC) states. We find that…

Epithelial protein lost in neoplasm (EPLIN), an actin-binding protein, has been described as both a tumor promoter and tumor suppressor in different cancers. The roles of EPLIN isoforms (α/β) remain largely unknown and could explain these opposing views. We observed distinct EPLIN isoform localization in breast cancer cells; EPLINα is…

Lymphatic capillaries continuously take up interstitial fluid and adapt to resulting changes in vessel calibre1-3. The mechanisms by which the permeable monolayer of loosely connected lymphatic endothelial cells (LECs)4 maintains mechanical stability remain elusive. Here we identify dynamic cytoskeletal regulation of LEC shape, induced by isotropic stretch, as crucial for…