Laminins in Cellular Differentiation.

Basement membrane laminins (LNs) have been shown to modulate cellular phenotypes and differentiation both in vitro and during organogenesis in vivo. At least 16 laminin isoforms are present in mammals, and most are available as recombinant proteins. Ubiquitous LN511 and LN521 promote the clonal derivation and expansion of pluripotent embryonic stem cells (ESCs), and, together with other highly cell type-specific laminins, they can support the differentiation of stem cells into, for example, cardiac muscle fibers, retinal pigmented epithelial (RPE) cells and photoreceptors, dopamine (DA) neurons, and skin keratinocytes. The laminin-supported differentiation methods are highly reproducible and can be made chemically defined and fully xeno-free - a prerequisite for preparing therapeutic stem cell-derived cells. In this review we describe recent work on the use of laminin-based cell culture matrices in stem cell differentiation.