Effect of methyl mercaptan on synthesis and degradation of collagen.

Effect of methyl mercaptan on synthesis and degradation of collagen.
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甲硫醇对胶原合成和降解的影响。

DOI:
10.1111/j.1600-0765.1996.tb00499.x
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发表时间:
1996
影响因子:
3.5
通讯作者:
Tonzetich,J
Tonzetich,J
中科院分区:
医学3区
文献类型:
--
作者:
Johnson,P;Yaegaki,K;Tonzetich,J

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Measurements of the conversion of [14C]‐proline to [14C]‐hydroxyproline were employed to assess the effect of methyl mercaptan on intra‐ and extracellular metabolism of collagenous proteins in human gingival fibroblast cultures. Following a 30‐min pulse, 10 ng of methyl mercaptan per ml of 95% air/5% CO2, headspace suppressed collagen synthesis by 39% and increased the intracellular degradation of newly synthesized collagen from 26% to 42%. Parallel cultures assayed for proline transport demonstrated a 29% inhibition of [14C]‐proline uptake. A similar analysis of cultures exposed to methyl mercaptan for 12 h revealed an increase in intracellular degradation (20% control vs. 30% test) and a marked increase in extracellular collagenolysis (4% control vs. 55% test). While pulsing, collagen synthesis was decreased by 39%. Slab gel electrophoresis also demonstrated that treatment with methyl mercaptan caused reductions both in mature a, and α2chains of type I collagen and in type III procollagen. Identities of the procollagen species were confirmed by pepsin digestion. Reverse transcribed polymerase chain reaction was utilized to compare expression of a1 chains of type I procollagen with type III procollagen and indicated suppression of mRNA synthesis for type III procollagen in cultures exposed to methyl mercaptan.
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