Tan, Richard P.; Hallahan, Nicole; Kosobrodova, Elena; Michael, Praveesuda L.; Wei, Fei; Santos, Miguel; Lam, Yuen Ting; Chan, Alex H. P.; Xiao, Yin; Bilek, Marcela M. M.; Thorn, Peter; Wise, Steven G. published the artcile< Bioactivation of Encapsulation Membranes Reduces Fibrosis and Enhances Cell Survival>, Recommanded Product: (S)-2-(6-Hydroxybenzo[d]thiazol-2-yl)-4,5-dihydrothiazole-4-carboxylic acid, the main research area is islet encapsulation device immunomodulatory surface coating macrophage polarization; encapsulation devices; immunomodulatory surface coatings; islet cells; macrophage polarization; type I diabetes.
Encapsulation devices are an emerging barrier technol. designed to prevent the immunorejection of replacement cells in regenerative therapies for intractable diseases. However, traditional polymers used in current devices are poor substrates for cell attachment and induce fibrosis upon implantation, impacting long-term therapeutic cell viability. Bioactivation of polymer surfaces improves local host responses to materials, and here we make the first step toward demonstrating the utility of this approach to improve cell survival within encapsulation implants. Using therapeutic islet cells as an exemplar cell therapy, we show that internal surface coatings improve islet cell attachment and viability, while distinct external coatings modulate local foreign body responses. Using plasma surface functionalization (plasma immersion ion implantation (PIII)), we employ hollow fiber semiporous poly(ether sulfone) (PES) encapsulation membranes and coat the internal surfaces with the extracellular matrix protein fibronectin (FN) to enhance islet cell attachment. Sep., the external fiber surface is coated with the anti-inflammatory cytokine interleukin-4 (IL-4) to polarize local macrophages to an M2 (anti-inflammatory) phenotype, muting the fibrotic response. To demonstrate the power of our approach, bioluminescent murine islet cells were loaded into dual FN/IL-4-coated fibers and evaluated in a mouse back model for 14 days. Dual FN/IL-4 fibers showed striking reductions in immune cell accumulation and elevated levels of the M2 macrophage phenotype, consistent with the suppression of fibrotic encapsulation and enhanced angiogenesis. These changes led to markedly enhanced islet cell survival and importantly to functional integration of the implant with the host vasculature. Dual FN/IL-4 surface coatings drive multifaceted improvements in islet cell survival and function, with significant implications for improving clin. translation of therapeutic cell-containing macroencapsulation implants.
ACS Applied Materials & Interfaces published new progress about Angiogenesis. 2591-17-5 belongs to class thiazole, and the molecular formula is C11H8N2O3S2, Recommanded Product: (S)-2-(6-Hydroxybenzo[d]thiazol-2-yl)-4,5-dihydrothiazole-4-carboxylic acid.
Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica