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. 1991 May 15;276(Pt 1):57–62. doi: 10.1042/bj2760057

Interleukin-1 beta-induced changes in the kinetic constants of L-proline uptake in human skin fibroblasts.

M Fénéant-Thibault 1, P Galera 1, J Maccario 1, A Boutron 1, J P Pujol 1, N Moatti 1
PMCID: PMC1151143  PMID: 1903934

Abstract

The effects of interleukin-1 beta (IL-1) on L-proline uptake in human skin fibroblasts were investigated. Exposure of the fibroblasts to IL-1 (5, 10 or 50 pg/ml) for 2 h did not change L-proline uptake. In contrast, inhibition was observed after 6 h of IL-1 treatment, and only 60% of the control uptake remained after incubation for 24 h with 10 pg of IL-1/ml. IL-1 depressed the activity of both transfer systems; the low-affinity system inhibited by alpha-(methylamino)isobutyric acid (Me-AIB), corresponding to system A, and a high-affinity transfer system which is unaffected by Me-AIB. The inhibitory effect increased as the L-proline concentration decreased. To determine whether IL-1-induced prostaglandin release influences proline uptake, indomethacin (14 microM) was added as a cyclo-oxygenase inhibitor. Indomethacin itself decreased L-proline uptake but to a lesser extent than did IL-1. When IL-1 was tested in the presence of indomethacin, the inhibition of L-proline uptake was still observed, with values between those obtained with each substance in isolation. This suggests that the inhibitory effect of IL-1 on proline uptake by skin fibroblast does not only involve the prostaglandins that accumulate in the medium, but no firm conclusion can be drawn, due to the fact that the inhibition by the two agents was not statistically independent. Kinetic analyses for 1 min combined with inhibition experiments showed that IL-1 induced a decrease in the Km and Vmax, values of the high-affinity transport system, whereas it increased the Km of system A. Therefore the two systems of proline uptake in skin fibroblasts are probably inhibited by IL-1 via different mechanisms.

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Selected References

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