Biofunctional scaffolds that support the adhesion, proliferation, and osteo-differentiation of mesenchymal stem cells (MSCs) are critical for bone tissue engineering. In this study, a simple in situ UV-crosslinking strategy was utilized to fabricate gelatin electrospun fibrous (GEF) scaffolds with multiple biosignals, including cell adhesive Arg-Gly-Asp (RGD) peptide, osteo-conductive hydroxyapatite (HAp) nanoparticles, and osteo-inductive bone morphogenic protein-2 (BMP-2). The adhesion and proliferation of MSCs on the GEF scaffolds were improved by the incorporation of RGD. Meanwhile, the incorporation of HAp and BMP-2 enhanced osteo-differentiation of MSCs. The three incorporated bio-factors exert a synergistic effect on osteogenesis of MSCs in the GEF scaffolds. This strategy of incorporating multiple biomolecules could be used to fabricate crosslinked electrospun scaffolds of natural polymers for tissue-engineering applications.
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http://dx.doi.org/10.1016/j.colsurfb.2015.11.017 | DOI Listing |
Onco Targets Ther
January 2025
Department of Pharmacology, adMare BioInnovations, Montréal, Quebec, H4S 1Z9, Canada.
The gene is nearly ubiquitously subjected to activating mutation in pancreatic adenocarcinomas (PDAC), occurring at a frequency of over 90% in tumors. Mutant KRAS drives sustained signaling through the MAPK pathway to affect frequently disrupted cancer phenotypes including transcription, proliferation and cell survival. Recent research has shown that PDAC tumor growth and survival required a guanine nucleotide exchange factor for RAS homolog family member A (RhoA) called GEF-H1.
View Article and Find Full Text PDFInt J Mol Sci
October 2024
Laboratory of Neurogenetics and Molecular Medicine, Center for Genomic Sciences in Medicine, Institut de Recerca Sant Joan de Déu, 08950 Barcelona, Spain.
ACS Med Chem Lett
June 2024
Discovery & Early Development, Haihe Biopharma Co., Ltd., No 865# Zuchongzhi Road Zhangjiang Science City, Shanghai 201203, China.
SOS1, a guanine nucleotide exchange factor (GEF), plays a critical role in catalyzing the conversion of KRAS from its GDP- to GTP-bound form, regardless of mutation status, and represents a promising new drug target to treat all KRAS-driven tumors. Herein, we employed a scaffold hopping strategy to design, synthesize, and optimize a series of novel binary ring derivatives as SOS1 inhibitors. Among them, compound (HH0043) displayed potent activities in both biochemical and cellular assays and favorable pharmacokinetic profiles.
View Article and Find Full Text PDFCells
April 2024
UCL Institute of Ophthalmology, University College London, London EC1V 9EL, UK.
Tight junctions are a barrier-forming cell-cell adhesion complex and have been proposed to regulate cell proliferation. However, the underlying mechanisms are not well understood. Here, we used cells deficient in the junction scaffold ZO-1 alone or together with its paralog ZO-2, which disrupts the junctional barrier.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
March 2024
Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853.
The late stages of Golgi maturation involve a series of sequential trafficking events in which cargo-laden vesicles are produced and targeted to multiple distinct subcellular destinations. Each of these vesicle biogenesis events requires activation of an Arf GTPase by the Sec7/BIG guanine nucleotide exchange factor (GEF). Sec7 localization and activity is regulated by autoinhibition, positive feedback, and interaction with other GTPases.
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