cyclo(l phe l val)

Cyclo(L-Phe-L-Val) is a metabolite of the sponge bacterium Pseudoalteromonas sp. NJ6-3-1, capable of autoinducing the production of antibacterial substances active against S. aureus at low cell density. It induces neurite outgrowth and branching of chick cortical neurons in vitro at concentrations of 16 and 32 μM, increases phosphorylation of the PI3K substrate Akt, and this induction can be blocked by the PI3K inhibitor LY294002. Additionally, it enhances axon sprouting of calcitonin gene-related protein positive (CGRP+) primary afferents in the spinal cord post-crush injury and of serotonin neurons in the uninjured spinal cord. Cyclo(L-Phe-L-Val) is also a bitter taste component of cocoa and roasted coffee.