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L-tryptophan 투여에 의한 간내 triglyceride 축적에 대한 실험적 연구

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 Studies on the hepatic accumulation of the triglyceride following the injection of L-tryptophan in albino rats 
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L-tryptophan is one of the essential amino acids and a component of body protein. The metabolites of tryptophan, niacin, serotonin and tryptamine demonstrated many biochemical, physiologic and pharmacologic roles. Also tryptophan is involved in body metabolism through enzyme induction, gluconeogenesis and enzyme agreggation.

In 1965 Kim observed additional effect 7f tryptophan, namely the aciu-mulation of triglyceride following the injection of tryptophan. "Fatty liver" as defined by the hepatocellular infiltration with fat and the accumulation of triglyceride has been investigated by many workers. Carbon tetrachloride, ethionine, phosphorus, azaserine, ethahol and a choline deficient diet can produce a fatty liver.

The investigation has confimed the finding of triglyceride accumulation following the injection of tryptophan, and the mechanism of this effect has been studies.

Male albino rats weighing 200-25Og, prior to the experiment, have been fed a dict 15% casein for one week. L-tryptophan 0.34 m Mole per rat have been injected intraperitoneally into the intact or adrenalectomized rats. Three hours later the rats have been sacrifice7d and the concentration of hepatic triglyceride, free

fatty acid and citrate have been determined.

To study the mechanism of the accumulation of the triglyceride in vivo and in vitro experiments using Warburg's apparatus have been carried out. Results are as fellows :

1. A single injection of 0.34 mMole of tryptophan produced hepatic trigByceride accumulatien which appeared by 2.5 hours after the injection and disappeared after 24 hours.

2. Multiple injections(5 days) of tryptophan increased hepatic triglyceride but only to the same extent as seen following a single injection. This indicates the phenomenon was only temporal.

3. Only tryptophan among the general amino acids caused an increase in hepatic triglyceride.

4. Results of studies on the mechanism of tryptophan-triglyceride effect.

a) An accumulation of triglyceride was demonstrated in adrenalectomized rats.

b) Fellowing the administration of reserpine the rats were given L-tryptophan, and a subsequent increase was nutted in the hepatic triglyceride.

c) Although L-methionine usually has a lipotropic effect it failled to stop acoumulation of trigly-ceride following tryptouhan injection.

d) In Warburg's system(in vitro study) using acetate-1-l4**C tryptophan stimulated lipid biosynthesis in the liver slice.

e) In vivo and in vitro tryptophan increased the amount of citrate in the liver and plasma. Citrate could accelerate the rate of lipid synthesis.

f) There was no difference between the tryptophan treated and the control in the rate of palmitate-1-l4**C Oxidation.
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