Abstract
The thin extracellular matrix that is found basally in epithelial and endothelial cells and around smooth muscle, peripheral nerves, and fat cells is known as the basement membrane. A murine tumor matrix extract, termed Matrigel, has provided an abundant source of basement membrane proteins (laminin, collagen IV, heparan sulfate, etc.). Matrigel gels at room temperature into a structure similar to the authentic matrix. Embryonic tissue explants, stem cells, and various cell types differentiate when cultured on Matrigel. Matrigel has been used in various in vitro assays for angiogenesis, cell invasion, spheroid formation, organoid formation from a single cell, etc. In vivo Matrigel improves/promotes tumor xenograft growth and is used to measure angiogenesis, improve heart and spinal cord repair, increase tissue transplant take, etc. Endothelial cells plated on top of Matrigel form capillary-like tubules. The gene for thymosin beta 4 was induced at 4 h after plating endothelial cells on Matrigel, and when the thymosin beta 4 protein was added exogenously to the culture, tubule formation was accelerated. Thymosin beta 4, a small 43 kDa protein present in all body fluids and cells, has multiple biological activities, including reducing inflammation, apoptosis, and cytotoxicity while increasing cell migration, stem cell recruitment and differentiation, and tissue repair. Thymosin beta 4 was subsequently found to promote angiogenesis in vivo and to improve dermal and ocular healing in experimental injury models. It has regenerative activity in animal models of traumatic brain injury, stroke, multiple sclerosis, heart attack, peripheral neuropathy, liver and kidney fibrosis, and hair growth. Clinical trials have demonstrated its efficacy for both stasis and pressure ulcers and for both dry eye and a rare ocular disease. This mini review will discuss the development of Matrigel and the discovery of thymosin beta 4 as a regenerative protein that is upregulated when endothelial cells are plated on Matrigel.
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Acknowledgments
The early studies on Matrigel and some of the preclinical work on thymosin beta 4 were performed by HKK and were carried out at the National Institutes of Health (NIH) with support from NIH, Bethesda, MD, USA. The authors thank the members of GTreeBNT for providing information on their planned clinical trials.
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Hynda K. Kleinman, and Kyeongsoon Kim consult for GtreeBNT. Hunhee Kang is an employee of GtreeBNT.
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Kleinman, H.K., Kim, K. & Kang, H. Matrigel uses in cell biology and for the identification of thymosin β4, a mediator of tissue regeneration. Appl Biol Chem 61, 703–708 (2018). https://doi.org/10.1007/s13765-018-0400-6
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DOI: https://doi.org/10.1007/s13765-018-0400-6