Studies on the lipid of rat dental pulp

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  • 歯髄の脂質に関する研究
  • 歯髄の脂質に関する研究-1-ラット切歯歯髄の脂質ならびに脂肪酸組成の解析と放射線全身照射による変動
  • シズイ ノ シシツ ニカンスルケンキュウ 1 ラット セッシ シズイ ノ シシ
  • Iラット切歯歯髄の脂質ならびに脂肪酸組成の解析と放射線全身照射による変動
  • I. Analyses of lipid component and fatty acid composition in rat incisor pulps before and after whole-body x-ray irradiation

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Abstract

Lipids and fatty acids extracted from rat incisor pulps before and after whole-body x-ray irradiation at 1000R were qualitatively and quantitatively analysed by means of thin-layer and gas-liquid chromatography, and the results are as follows.<br>1) Ratio of the total lipid weight to protein weight was obtained 0.26 in normal rat dental pulps. The ratio in the irradiated group (3 days after irradiation) did not change.<br>2) In fatty acid composition of lipid of normal rat incisor pulps, palmitic, oleic, stearic, arachidonic, and linoleic acids were much in this order, and palmitic, stearic and oleic acids were major component accounted for over 78% of the total fatty acids. In that of the irradiated group, the decrease of oleic acid and the increase of arachidonic acid were observed comparing those of normal pulp lipid.<br>3) The major lipid of normal dental pulps composed of phospholipid, choresterol, triglyceride and choresterol ester, and phospholipid and choresterol accounted for about 45% and 30% of the total lipids, respectively. In the irradiated group, the decrease of choresterol and the increase of choresterol ester were represented.<br>4) In results of tentative identification by various color reaction on the thin-layer chromatograph, the major phospholipids of dental pulps were lecithin, phosphatidyl ethanolamine and phosphatidyl serine, which accounted for over 90% of the total phospholipids. It is significant that phosphatidyl serine in dental pulp is greater than in any other mammalian soft tissue so far studied. In the irradiated group, it was slightly observed the increment of lecithin and the decrement of phosphatidyl serine, but they are not predominant.

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