• Journal of Nutrition and Health
• /
• v.29 no.8
• /
• pp.867-873
• /
• 1996

This study was undertaken to determine whether the anabolic steroid nandrolone phenylpropionate(NPP) can inhibit the muscle atrophy and reduction in muscle protein synthesis caused by glucocorticoids in female rates. Daily injections of 50mg/kg of corticosterone for eight days induced significant reductions in body weight gain and protein without affecting food intake. The mass, protein and RNA content, ratio of RNA to protein, and fractional rate of protein synthesis, measured in vivo, of gastrocnemius muscle were all significantly reduced by corticosterone treatement. Simultaneous administration of NPP at a dose of 10mg/kg with corticosteorne (50mg/kg) fully inhibited the reductions in the mass, protein and RNA content of gastrocnemius muscle, and body weight gain and protein with no alteration in food intake but the reduction in fractional rate of muscle protein syntheis was only partially prevented. The results indicate that the anabolic steroid nandrolone phenylpropionate is capable of preventing muscle atrophy in female rats treated with excess corticosterion.

• Journal of Nutrition and Health
• /
• v.26 no.3
• /
• pp.248-253
• /
• 1993

아나보릭 스테로이드인 nandrolone phenylpropionate(NPP)가 인슐린에 의한 지방축적의 증가 및 절식시 혈중 유리지방산 농도에 미치는 영향을 암컷쥐에서 조사하였다. 인슐린 투여는 식이 섭취량을 유의적으로 증가시켰는데 이는 인슐린에 의한 혈당 저하에 의한 것으로 보인다. 지방 축적은 인슐린 투여에 의해 유의적으로 증가하였으나 체단백질이나 근육단백질 함량은 변화하지 않았다. 인슐린에 NPP를 동시에 투여하였을 때 NPP는 인슐린에 의한 저혈당증과 지방축적의 증가를 부분적으로 완화시켰으며 체단백질과 근육단백질 함량을 유의적으로 증가시켰다. 반면 NPP는 절식시킨 쥐의 혈중 유리 지방산 농도에는 영향을 미치지 않았다. 이러한 결과를 통해 아나보릭 스테로이드가 단백질 대사에 미치는 영향은 인슐린과 무관하며, 아나보릭 스테로이드의 지방축적 억제효과는 아나보릭 스테로이드가 지방분해에는 영향을 미치지 않고 인슐린에 의한 지방함성으로의 당이용도를 저해함으로 발휘된다는 것을 알 수 있다.

• Journal of Nutrition and Health
• /
• v.29 no.8
• /
• pp.874-880
• /
• 1996

The effects of an anabolic steroid, nandrolone phenylpropionate(NPP), on body weight gain and body protein, and muscle protein metabolism were inestigated in adrenocorticotrophic hormone(ACTH)-treated male and female rats. Daily injections of 100ug/day of ACTH for 7-8 days caused a cessation of growth in females and a net loss of body weight in males which were associated with significant reductions in body protein content. However, food intake was not affected by ACTH in either sex. The weight, protein content and fractional rate of protein synthesis, measured in vivo, of gastrocnemius muscle were all significantly reduced in both sexes. NPP at a dose of 4mg/kg body weight prevented the reduction in body weight gain in ACTH-treate females but not in males. However, boy protein content was increased by NPP in both sexes which was associated with increases in the weight, protein content and fractional rate of protein synthesis of gastrocnemius muscle. ACTH treatment caused a marked increase in plasma concentrations of corticosterone in both sexes. NPP suppressed much of the increases in corticosterone concentrations in both sexes. The results of the present study suggest that NPP exerts at least part of its anabolic effect by reducing plasma concentrations of catabolic glucocorticoid hormones, through suppressing the response of the adrenals to ACTH.

• Nutritional Sciences
• /
• v.1 no.1
• /
• pp.3-7
• /
• 1998

The aim of the present investigation was to see whether an anabolic steroid, nandrolone phenylpropionate (NPP), exerts protienanabolic effects under such adverse nutritional conditions as protein deficiency and protein-energy malnutrition in male rats. feeding on a low-protein (8% casein) diet resulted in a marked reduction in body weight gain that was associated with reductions in body protein and protein content of gastrocnemius muscle. Administration of NPP (4 mg/kg body weight) did not alter muscle and body protein depletion induced by a low-protein diet. 50% food restriction caused reductions in body protein and in protein content of gastrocnemius muscle. These reductions were partially prevented by NPP (4 mg/kg body weight). Food restriction did not affect plasma concentration of corticosterone, insulin, or tetosterone plus dihydrotestosterone. On the other hand, neither plasma concentration of corticosterone nor insulin were affected by NPP. The present results show that anabolic steroids do not express anabolic effects under conditions of protein deficiency, but in protein-energy malnutrition, anabolic steroids exert their anabolic effects even in male rats.