Key result
Substance P, beta-endorphin, and calcitonin gene-related peptide markedly stimulate RPE cell growth in vitro.
Why the study?
The regulation of retinal pigment epithelial cell growth by neuropeptides was not well understood despite known cytokine effects and proximity to neural retina neuropeptides.
Do neuropeptides stimulate the growth of retinal pigment epithelial cells in vitro?
Do neuropeptides stimulate the growth of retinal pigment epithelial cells in vitro?
Neuropeptides such as substance P, beta-endorphin, and calcitonin gene-related peptide stimulate the growth of retinal pigment epithelial cells in vitro.
In vitro neuropeptide stimulation of RPE growth is hypothesis-generating; leaves open any in vivo or clinical relevance.
PURPOSE: The proliferation of many cell types are regulated by cytokines and neuropeptides by autocrine and paracrine mechanisms. Retinal pigment epithelial (RPE) cells are also regulated by cytokines. But RPE cells are very close to the neural retina which has some neuropeptides. The present study was to investigate the effects of neuropeptides on the growth of RPE cells. METHODS: RPE cells were obtained from the eyes of 11 day old chick embryos and cultured in Dulbecco's modified Eagle's culture medium containing 10% fetal calf serum. The growth of RPE cells was evaluated by [3H]-thymidine uptake. RESULTS: Substance P, beta-endorphin and calcitonin gene-related peptide markedly stimulated the growth of RPE cells. The effects of methionine-enkephalin, somatostatin and vasoactive intestinal peptide were intermediate. The strongest effects of substance P, beta-endorphin and calcitonin gene-related peptide were observed at 10(-6) to 10(-7) M. The stimulation of RPE cells with beta-endorphin was inhibited by naloxone, suggesting that the stimulation with beta-endorphin is mediated by an opioid receptor. beta-endorphin and substance P induced RPE cell growth stimulating activity. Leucine-enkephalin and neuropeptide Y did not affect the growth of RPE cells. CONCLUSIONS: These results suggest that neuropeptides play an important role in the regulation of RPE cell growth.
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Kishi et al. (1996) studied this question. Neuropeptides (Substance P, beta-endorphin, calcitonin gene-related peptide) was evaluated on Growth of RPE cells evaluated by [3H]-thymidine uptake. Substance P, beta-endorphin, and calcitonin gene-related peptide markedly stimulated the growth of retinal pigment epithelial cells in vitro at concentrations of 10(-6) to 10(-7) M.
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