• Title/Summary/Keyword: testosterone.

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Testosterone Effect on Growth, Feed Intake and Composition of the Plasma in Rats (흰쥐의 성장과 사료섭취및 혈장내 성분에 대한 테스토스테론의 영향)

  • Park, Hang Kyun;Hur, In Soo;Park, Soo Bong
    • Current Research on Agriculture and Life Sciences
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    • v.1
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    • pp.189-194
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    • 1983
  • To investigate the effect of testosterone upon the body weight, feed intake, and creatinine and cholesterol content in the blood plasma, thirty rats which were three months old, were assigned into 6 groups of 5 rats. Those groups included one control group and 5 castrated groups which injected 0 to 4mg of testosterone each. The body weight gain in the control showed relatively higher value than the castrated, showing no significant effect between the groups. Also no significant effect in the feed intake between the groups, due to the amount of testosterone injection, was found. The creatinine content in the plasma showed a highly significant effect between the groups, giving a lower concentration in the castrated group compared with the control while the content in the hormone treated groups increased with increasing amount of testosterone injection. Otherwise the cholesterol concentration in the plasma was inversely proportional to the creatinine in each group.

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옻나무 유래 Flavonoid처리가 흰쥐 Leydig 세포의 체외배양에서 Testosterone분비에 미치는 영향

  • 성환후;최선호;민관식;장유민;나천수;정일정
    • Proceedings of the KSAR Conference
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    • 2001.03a
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    • pp.80-80
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    • 2001
  • 옻나무 유래 Flavonoid(F)는 항암 효과, 숙취해소 등의 효능이 있으며, 신장의 기능을 촉진하고 생식에도 영향을 준다고 알려져 있다. 그 주성분으로는 fustin, fisetin, sulfuretin, butein으로 추정되고 있다. 본 연구팀의 예비실험에서 성숙 흰쥐에게 F를 30일간 5mg씩 구강투여 하여 정소 중량 및 혈액 내 Testosterone 농도를 분석한 결과, 정소 중량이 증가되고 혈중 Testosterone의 농도도 대조구에 비해 유의적으로 높은 결과를 얻었다. 이에 본 연구의 목적은 옻나무 유래 F가 성숙 수컷 횐쥐의 생식 기능에 직접 미치는 영향을 알아보고자, 흰쥐 Leydig 세포를 분리, 회수하여 체외배양에서 Testosterone농도를 조사하였다. SD계 흰쥐(약 12주령, 체중 250g 전후)의 정소를 적출 한 후, Leydig 세포를 회수하기 위해 0.25% collagenase용액에 넣어 34$^{\circ}C$에서 15분간 진탕 수조에서 배양하였다. 배양된 정소조직은 D-MEM 배양액(10% FCS와 antibiotics 첨가)으로 2~3회 세척한 후 세포 수를 1$\times$$10^{6}$ cells/$m\ell$/well로 분주하여, F(20, 40, 80, 160ng), IGF-I(50, 100ng) 와 LH(10, 100ng) 용량별 각각 첨가하여 배양하였다. 각 처리 후, 배양시간(3, 6, 12, 24, 36시간)에 따라 배양액을 회수하여 COAT-A-COUNT(DPC, USA) kit를 이용하여 RIA방법에 의해 Testosterone을 분석한 결과는 다음과 같다. 대조구 Leydig 세포를 36시간까지 체외 배양하여 Testosterone의 농도를 조사한 결과, 24시간 배양구가 가장 높은 농도를 나타내었다. F를 단독 첨가하여 12시간 배양한 실험에서 F 80ng 첨가구에서 유의적으로 높은 농도를 보였다. LH 10ng 및 100ng 첨가구의 시간별 변화로는, LH 10ng 첨가구에서는 6~12시간 이후, LH 100ng 첨가구에서는 3~6시간 사이에서 유의적인 증가를 보였다. 또한, LH 10ng 첨가 실험에서는 LH 10ng+F 40ng에서 12시간 배양 시, 유의적으로 높은 Testosterone 분비를 확인하였으며, LH 100ng을 첨가하여 3시간 배양 시는 각 처리구 마다 높은 유의적 차이를 보였다. 한편, GH에 관여하는 IGF-I 첨가효과를 비교 검토한 결과, LH 100ng+IGF-I 100ng, 6시간 배양구에서 유의적으로 높게 나타내었다. 이상의 결과로, F 단독 처리 시의 적정량은 약 80ng이며, 흰쥐 정소 Leydig 세포의 Testosterone분비를 촉진하는 작용을 하는 것으로 사료되며, 특히 LH+F구에서 Testosterone분비를 더욱 향상시킴으로써 정소 Leydig 세포의 Androgen 생성을 촉진시키는 역할이 있는 것으로 보여진다 따라서 옻나무 유래 F는 포유동물의 생식기능에 중요하게 작용하는 것으로 사료된다.

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THYROID HORMONES AND TESTOSTERONE IN SHEEP AGE RELATED PROFILES OF SERUM THYROXINE, TRI-IODOTHYRONINE AND TESTOSTERONE IN KAGHANI, RAMBOUILLET AND KAGHANI × RAMBOUILLET SHEEP

  • Ahmad, M.M.;Mughal, M.R.;Bari, A.;Khan, M.I.;Shahab, M.
    • Asian-Australasian Journal of Animal Sciences
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    • v.5 no.1
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    • pp.101-106
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    • 1992
  • Secretory patterns of serum tri-iodothyronine, thyroxin and testosterone were analysed by specific radioimmunoassay in Kaghani (n = 42), Rambouilet (n = 42) and Kaghani ${\times}$ Rambouillet (n = 42) male sheep to determine age and breed related changes. Animals were examined at 1-2 wk, 8, 10, 12, 20, 22 and 24 months of age (n = 6/age group). All animals were maintained under standard conditions of feeding and management. $T_3$ and $T_4$ concentrations were maximal (p < 0.01) in 1-2 wk old lambs of all breeds studied ($207.4{\pm}14.9-276.8{\pm}20.4ng/dl$ and $5.76{\pm}0.3-7.23{\pm}0.9{\mu}g/dl$, respectively). For all the breeds, concentrations of $T_3$ declined markedly (p < 0.01) at 8 month of age and then varied in a narrow range ($44.5{\pm}14.0-87.0{\pm}4.8ng/dl$) up to the age of 24 month. While, serum $T_4$ concentrations decreased (p < 0.01) to nadir ($0.97{\pm}0.1-1.43{\pm}0.3{\mu}g/dl$) at 10 months of age in all the 3 breeds. Afterwards, $T_4$ levels increased gradually and attained a small peak at 20 months before declining again at 22 and 24 months of age. Serum $T_3$ and $T_4$ concentrations were correlated significantly (p < 0.05) and their ratio was constant at all ages in the different breeds. Age significantly (p < 0.01) influenced the secretion of testosterone in the breeds examined but the breed differences were comparable. Mean serum concentrations of testosterone were low from 1-2 wk to 10 months of age in the Kaghani, Rambouillet and Kaghani ${\times}$ Rambouillet animals. Peak testosterone levels were noted in the 12 months old Kaghani ($1.75{\pm}0.4ng/ml$), Rambouillet ($1.30{\pm}0.2ng/ml$) and their $T_3$ cross animals ($1.16{\pm}0.08ng/ml$). Mean testosterone levels, thereafter, decreased at 20 months and then at 22 and 24 months remained variable but higher than observed at 1-2 wk -10 months of age. The findings of the present study indicate a significant influence of age but not of breed on the peripheral concentrations of thyroid hormones and testosterone. Serum concentrations of $T_3$ and $T_4$ were not related to testosterone levels. High thyroid secretory activity observed at prenatal phase of development may play an important role in preparing the lambs to extrauterine environments.

Effects of Testosterone, 17β-estradiol, and Progesterone on the Differentiation of Bovine Intramuscular Adipocytes

  • Oh, Young Sook;Cho, Sang Bum;Baek, Kyung Hoon;Choi, Chang Bon
    • Asian-Australasian Journal of Animal Sciences
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    • v.18 no.11
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    • pp.1589-1593
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    • 2005
  • The aim of this study was to investigate the effects of testosterone, 17$\beta$-estradiol, and progesterone on the differentiation of bovine intramuscular adipocytes (BIA). Stromal-vascular (SV) cells were obtained from M. longissimus dorsi of 20 months old Korean (Hanwoo) steers, and were cultured in DMEM containing 5% FBS. The proliferated BIA were induced to differentiate with 0.25 $\mu$M dexamethasone, 0.5 mM 1-methyl-3-isobutyl-xanthine and 10 $\mu$g/ml insulin. During differentiation, the cells were treated with testosterone, 17$\beta$-estradiol, and progesterone at concentrations of $10^{-10}$, $10^{-9}$, and $10^{-8}$ M, respectively, for 12 days. Regardless of its concentration, testosterone remarkably reduced lipid droplets in the cytosol of BIA. On the other hand, 17$\beta$-estradiol and progesterone increased the accumulation of lipid droplets in BIA. Testosterone significantly (p<0.05) decreased GPDH activities with a dose-dependent pattern. 17$\beta$-Estradiol treatment onto BIA during differentiation, however, increased GPDH activity showing the highest activity (11.3 nmol/mg protein/min) at $10^{-10}$ M. Treatment of BIA with progesterone also increased (p<0.05) GPDH activity with the highest activity (13.8 nmol/mg protein/min) at $10^{-9}$ M. In conclusion, the results in the current study suggest that testosterone inhibits differentiation of BIA by suppressing GPDH activity while 17$\beta$-estradiol and progesterone have adverse effects.

Effect of Phellius linteus water extract on benign prostatic hyperplasia

  • Kim, Yu-Na;Kim, Min-Sun;Chun, Sung-Sik;Choi, Jeong-Hwa
    • Nutrition Research and Practice
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    • v.7 no.3
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    • pp.172-177
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    • 2013
  • Benign prostatic hyperplasia (BPH) is one of the most common diseases among elderly men. As the old-age population is increasing recently, it is to our interest to observe the growing BPH within them. In BPH, the dihydrotestosterone (DHT) acts as promotes prostate growth. It inhibits enzyme $5{\alpha}$-reductase that is involved in the conversion of testosterone to the DHT activity which reduces the excessive prostate growth. Through experiments, the effects of Phellius linteus water extract performed on the BPH rats were induced by testosterone treatments. For 12 weeks, Sprague-Dawley rats were treated with testosterone for the induction of BPH. Rats were divided into four experimental groups: the not treated group (N), the testosterone injection and D.W treatment group (TN), the testosterone injection and Phellinus linteus treatment group (TP) and testosterone injection and finasteride treatment group (TF). Prostate weight, volume and weight ratio in the TP group and the TF group were significantly lower than the TN group. Testosterone and DHT levels in the TN group were significantly higher than that of the N group. And the TP group was significantly decreased than that of the TN group. While prostates of control rats revealed severe acinar gland atrophy and stromal proliferation; the TP and TF groups showed trophic symptoms and were lined by flattened epithelial cells, thus, the stromal proliferation is relatively low as compared to the TN group. These suggest that Phellinus linteus water extracts may be an useful remedy for treating the benign prostatic hyperplasia.

Effect of hCG on TeBG (hCG가 TeBG에 미치는 영향)

  • Sung, Ho-Kyung;Kim, Woo-Gyeum
    • The Korean Journal of Physiology
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    • v.14 no.1
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    • pp.7-13
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    • 1980
  • In the previous experiment, authors have shown that during the latter half of estrous cycle there was an increase in plasma testosterone level in the rats stimulated with hCG. To determine the physiologic significance of elevated plasma testosterone, changes of the plasma concentrations of TeBG and testosterone following hCG stimulation were analyzed in the rats having a regular 5 day cycle. The rats were divided into three groups; the control, the rats stimulated with single hCG on the day of proestrus and stimulated with hCG throughout the entire cycle. Blood samples were obtained once a day for an estrous cycle and analyzed for the binding capacity of TeBG using ammonium sulphate precipitation method and testosterone concentration by means of radioimmunoassay. Followings were the results; 1) There was no significant variation in the binding capacity of TeBG in peripheral blood during the estrous cycle of the control rats. 2) No cyclic variation in the binding capacity of TeBG was observed in the rats stimulated with single hCG on proestrus. although the levels tended to be higher in the rats with stimulation than in the control rats. 3) Continual stimulation of hCG produced a marked increase in the binding capacity of TeBG especially on the day of metaestrus. 4) The changes in the plasma level of testosterone followed the same basic pattern seen in the TeBG binding capacity. 5) From above results, the followings were suggested. a. hCG related increase of the binding capacity of TeBG is probably secondary to a modest increase in estrogen as well. b. hCG related increase of plasma testosterone in female rats is not entirely due to excess production rather in part due to decreased metabolism induced by the rise in TeBG. c. It seems likely that most of elevated testosterone shown in the rat stimulated with hCG is bound to TeBG and only small portion is unbound form which influence cellular activity. It is rather possible that an increase in TeBG could augment estrogen activity.

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Studies on Adivitie of $\beta$-Glucuronidase and Several Glycosidases of the Castrated Rat Epi-didymis Treated with Testosterone and Dibutyryl cAMP and the Cell Types of Epididymal Epithelium (Testosterone과 dibutyryl cyclic AMP가 거세한 흰쥐 부정소의 $\beta$ -glucosidase와 몇가지 glycosidase 활성에 미치는 영향 및 부정소 상피세포의 여러 유형에 관한 연구)

  • 최임순;정경순
    • The Korean Journal of Zoology
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    • v.32 no.3
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    • pp.290-303
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    • 1989
  • The activities of $\beta$-glucosidase, $\beta$-glucuronidase and N-acetyl-$\beta$-glucosaminidase were measured to investigate the relationships of them to sexual maturity. Peritoneal injections of testosterone and dibutyryl cAMP to rats were carried out. As a result, the activities of $\beta$-glucosidase and N-acetyl-$\beta$-glucosaminidase were significantly decreased from the third day and that of P -glucurondiase on the seventh day in the castrated groups. In addition, ihe activities of these three enzymes were significantly increased in the testosterone treated groups for 7 days. In case of dbcAMP injection, the activities of these three enzymes were similar to those of castrated groups or had a tendency to be decreased. On electron microscopic examination, principal cells, basal cells and narrow cells were observed in all regions of epididymis. Principal cells were general forms of columnar epithelial cells. Narrow cells had a number of small vesicles and light cells showed low electron density in comparison to other epithelial cells in cauda epididymis. Halo cells were migrating leucocytes btween epithelial cells.

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Effect of Cordyceps militaris on Testosterone Production in Sprague-Dawley Rats

  • Hong, In-Pyo;Choi, Yong-Soo;Woo, Soon-Ok;Han, Sang-Mi;Kim, Hye-Kyung;Lee, Man-Young;Lee, Myung-Ryul;Humber, Richard A.
    • International Journal of Industrial Entomology and Biomaterials
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    • v.23 no.1
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    • pp.143-146
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    • 2011
  • Some of men have been suffered from the insufficient secretion of testosterone causing by physical factors, social and psychological factors. Testosterone is an essential steroid hormone controlling male reproductive function. Alternative medicines in plants, fungi, and insects have been studied to enhance sexuality. $Cordyceps$ species including $Cordyceps$ $sinensis$ (CS) and $C.$ $militaris$(CM) has been used as for the enhancement of sexual functionfor hundreds of years in Far East Asian. In the present study, we determined the effect of fruiting bodies of $C.$ $militaris$ which cultured on bee drone medium (CMD) and brown rice medium (CMB) on testosterone concentration in Sprague-Dawley rats. Eighteen rats per group were housed to regular diet or diet supplemented with CMB and CDD, respectively for 4 weeks. Serum was collected from 6 rats per group. Results showed that changes of the body weight, food and water intake of the rats were not observed in this study. However, both CMB and CDD increased the serum testosterone concentration in rats. Furthermore, CMD significantly stimulated testosterone production (p <0.05) compared to the control. Hence, it suggests that $C.$ $militaris$ fruiting bodymight be developed as a complementary medicine to improve sexual hormones.

Effects of Testosterone Propionate Administration on Adrenal Gland in Hypophysectomized Male Rats (하수체척출(下垂體剔出) 숫흰쥐에 있어서 Testosterone Propionate의 투여(投與)가 부신(副腎)에 미치는 영향(影響))

  • Kim, K.Y.;Lee, K.S.;Chung, Y.C.
    • Korean Journal of Agricultural Science
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    • v.1 no.1
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    • pp.47-58
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    • 1974
  • This study was made to investigate whether there would be any direct relationship between testis and adrenal gland. After the iadministration of testosterone propionate to the hypophysectomized male rats, weight of adrenal glands, each zona rates in adrenal gland and histological changes measured from the 1st day to 56th day of the experimental period. The results obtained were as follows; 1. For the weight changes of thyriod gland, it showed a similar changes between the hypophysectomized and the testosterone propionate treated-hypophysectomized group. However, the weight of adrenal glands for the treatment groups were decreased as the time passed as compared to the control group, and the difference were highly significance at the 7th day and there on. 2. For the zona rates in adrenal gland the changes were similar between the hypophysectomized and the testosterone propionate treated-hypophysectomized group. Zona fasciculata and reticularis were decreased rapidly as time passed as compared to the control group, and the difference were significant at the 7th day and highly significant at the 14th day and there on. Adrenal medulla tended to increase, showing a significance with P<0.05 at 7th day, and P<0.01 at 14th day and there on. Zona glomerulosa showed no differences among the groups. 3. Histological changes for the testosterone propionate treated-hypophysectomized group were similar to the hypophysectomized group. Of adrenal gland, zona fasciculata and reticular is were degenerated and lost their function as time passed after treatment, and zona glomerulosa and adrenal medulla were observed not bo changed. 4. Since there were re no differences in weight changes of adrenal glands, the zonarates in adrenal gland and histological changes between the hypophysectomized and testosterone propionate treated-hypophysectomized group, it would appear that there were no direct relationship between the testis and the adrenal gland, but the involvement of hypophysis might be necessary for the control mechanism.

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Effect of 19-norandrostenedione on Steroidogenesis in Rat Testis (19-norandrostenedione이 흰쥐 정소내 스테로이드 대사에 미치는 영향)

  • Kim, Jeong-Wook;Yoon, Yong-Dal
    • Clinical and Experimental Reproductive Medicine
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    • v.21 no.3
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    • pp.305-314
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    • 1994
  • 19-norandrostenedione(19-NORA) is known as an intermediate in the metabolic pathway from androstenedione to estrone. Administration of esterified 19-nortestosterone, anabolic steroid, reduces serum gonadotropin and testosterone concentration, and results in reversible azoospermia in men. 19-NORA have been isolated from testis, but its function in testis is not clear yet. Therefore, this study was designed to determine the effect of 19-NORA on steroidogenesis and on spermatogenesis. 19-NORA was administrated by single intratesticular injection to adult male rats weighing 350-400 g in dose of 1 mg/50${\mu}l$. The serum and testis were collected on 1, 3, 7, 12, 48 hr after injection. The histological differences in testis were observed by routine paraffin method. The concentrations of testosterone and estradiol in serum and in left testis were determined by the conventional radioimmunoassays. One hour after 19-NORA treatment, serum concentrations of testosterone and estradiol increased significantly, compared to those of pre-treated(0 hr) group, and reduced gradually to the control level on 7 hour after injection. The concentration of testosterone in left testis increased slightly 1 hour after injection, and estradiol level increased significantly(p<0.05). Also, testosterone and estradiol level of control group revealed no difference with pre-treated (0 hr) group. Gonad index, structure of seminiferous tubules, and the number of step 7 th spermatid were simillar to control group. The present study suggests that the elevation of testosterone level results from increment of estradiol followed by the rapid metabolism of 19-NORA at 7 hour after injection, and then testosterone concentration may be recovered to control level by feedback mechanism of hypothalamus-hypothysis-testis axis.

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