Polarised epithelial cells form many of the body’s surfaces, including the outer epidermis and the lining of several internal tubular organs. The apical surfaces of these epithelial sheets secrete a specialised extracellular matrix (ECM) that is generally viewed as a passive protective layer against pathogens, but does apical ECM have any other roles? According to Meera Sundaram and colleagues, the apical ECM in C. elegans might help to maintain epithelial junction integrity and, consequently, epithelial tissue integrity (see p. 979). The researchers report that the extracellular leucine-rich repeat only (eLRRon) proteins LET-4 and EGG-6 are expressed on the apical surfaces of epidermal cells and some tubular epithelia, including those of the worm’s excretory system. Mutants lacking one or more of these proteins, they report, have multiple defects in apical ECM organisation and, although epithelial junctions initially form correctly in these mutants, they subsequently rupture. Together, these results suggest that eLRRon-dependent apical ECM organisation might modulate epithelial junction dynamics and integrity.
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