Abstract

To elucidate the molecular involvement of transglutaminase (TG) in central nervous system (CNS) regeneration, we cloned a full-length cDNA for neural TG (TG(N)) from axotomized goldfish retinas and produced a recombinant TG(N) protein from this cDNA. The levels of TG(N) mRNA and protein were increased at 10-30 days after optic nerve transection, and this increase in TG(N) was only localized in the ganglion cells in goldfish retinas. In retinal explant cultures, the recombinant TG(N) protein induced a drastic enhancement of neurite outgrowth, while TG(N)-specific RNAi significantly suppressed this neurite outgrowth. Taken together, these data strongly indicate that TG(N) is a key regulatory molecule for CNS regeneration.

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