• 대한생식의학회:학술대회논문집
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• 대한생식의학회 2007년도 제53차 추계학술대회 초록집
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• pp.99-99
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• 2007

• Toxicological Research
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• 제33권2호
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• pp.157-164
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• 2017

This study was to evaluate the age-dependent effects of caffeine exposure on the long bones and reproductive organs using male rats. A total of 15 immature male rats and 15 young adult male rats were allocated randomly to three groups: a control group and two groups fed caffeine with 120 and 180 mg/kg/day for 4 weeks. Exposure to caffeine at either dose significantly reduced body weight gain; a proportional reduction in muscle and fat mass in immature animals, whereas a selective reduction in fat mass with relatively preserved muscle mass in young adult animals. The long bones of immature rats exposed to caffeine were significantly shorter and lighter than those of control animals along with decreased bone minerals. However, there was no difference in the length or weight of the long bones in young adult rats exposed to caffeine. Exposure to caffeine reduced the size and absolute weight of the testes significantly in immature animals in comparison to control animals, but not in young adult animals exposed to caffeine. In contrast, the adrenal glands were significantly heavier in caffeine-fed young adult rats in comparison to control animals, but not in caffeine-fed immature rats. Our results clearly show that the negative effects of caffeine on the long bones and testes in rats are different according to the age of the rat at the time of exposure, and might therefore be caused by changes to organ sensitivity and metabolic rate at different developmental stages. Although the long bones and testes are more susceptible to caffeine during puberty, caffeine has negative effects on body fat, bone minerals and the adrenal glands when exposure occurs during young adulthood. There is a need, therefore, to educate the public the potential dangers of caffeine consumption during puberty and young adulthood.

• 대한수의학회지
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• 제27권1호
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• pp.9-17
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• 1987

The present study has been carried out to elucidate the antiestrogenic effects of tamoxifen in immature rat uterus. The content of DNA and protein and uterine wet weight were measured after the injections of $5{\mu}g$ of estradiol-$17{\beta}$, $50{\mu}g$ of tamoxifen, a combination of both, or vehicle only subcutaneously. The results obtained were summarized as follows: 1. DNA content in uterus was increased at 48 hours after estradiol-$17{\beta}$ or tamoxifen injection (p<0.01). 2. The increament rate of uterine DNA content was significantly (p<0.01) lower in tamoxifen treated group than that in estradiol-$17{\beta}$ treated group. 3. Antiestrogenic effect of tamoxifen on protein content in uterus was apparent at 72 hours after simultaneous administration of both drugs. 4. The uterine wet weight was started to increase at three hours after the injection of estradiol-$17{\beta}$ or tamoxifen. 5. While estradiol-$17{\beta}$ increased steadily uterine wet weight up to 138.5mg at 72 hours after the injection, but tamoxifen failed to increase it after 48 hours. Tamoxifen inhibited significantly (p<0.01) the effect of estradiol-$17{\beta}$ on it thereafter.

• The Korean Journal of Physiology and Pharmacology
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• 제4권1호
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• pp.1-8
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• 2000

To investigate the contributions of intrinsic membrane properties to the spontaneous activity of medial vestibular nucleus (MVN) neurons, we assessed the effects of blocking large and small calcium-activated potassium channels by means of patch clamp recordings. Almost all the MVN neurons recorded in neonatal $(P13{\sim}P17)$ rat were shown to have either a single deep after-hyperpolarization (AHP; type A cells), or an early fast and a delayed slow AHP (type B cells). Among the recorded MVN cells, immature action potential shapes were found. Immature type A cell showed single uniform AHP and immature B cell showed a lack of the early fast AHP, and the delayed AHP was separated from the repolarization phase of the spike by a period of isopotentiality. Application of apamin and charybdotoxin (CTX), which selectively block the small and large calcium-activated potassium channels, respectively, resulted in significant changes in spontaneous firings. In both type A and type B cells, CTX (20 nM) resulted in a significant increase in spike frequency but did not induce bursting activity. By contrast, apamin (300 nM) selectively abolished the delayed slow AHP and induced bursting activity in type B cells. Apamin had no effect on the spike frequency of type A cells. These data suggest that there are differential roles of apamin and CTX sensitive potassium conductances in spontaneous firing patterns of MVN neurons, and these conductances are important in regulating the intrinsic rhythmicity and excitability.

• 생명과학회지
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• 제17권10호
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• pp.1347-1353
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• 2007

성장과정 중 흰쥐 신장에서 나타나는 복합당질의 변화를 알아보기 위해 18일 태자부터 성체에 이르는 신장을 형태적 관찰과 더불어 9가지 lectin (SBA, DBA, PNA, BSL-1, RCA-1, sWGA, UEA-1, LCA 및 Con A)으로 검색하였다. 신장 발생단계에서 성숙한 신원구조와 함께 미성숙한 구조물 즉 소포와 요관아 등이 생후 14일에 이르기까지 관찰되었으며 생후 21일에 이르러 성체와 유사한 구조적 특성을 보였다. 복합당질의 변화를 보면 사구체에서 RCA-1, LCA및 Con A에 반응을 나타내며 RCA-1 및 LCA는 태자와 신생쥐에서 일시적으로 증가하다 성체에서 관찰되지 않으나 Con A는 성장과 더불어 증가하였다. 근위곡요세관은 UEA-1을 제외한 모든 lectin에 반응하며 DBA, SBA, PNA, BSL-1, RCA-1 및 Con A반응이 성장과 더불어 증가하며 특히 RCA-1과 BSL-1반응이 현저하였다. 이에 비해 sWGA와 LCA반응은 성장과정에 일시적으로 증가하며 성체에 이를수록 감소하였다. 원위곡요세관도 근위곡요세관 유사하게 DBA, SBA, PNA, BSL-1 및 RCA-1반응은 성숙과 함께 증가하나 LCA반응은 성숙과정에 일시적으로 증가하며 성체에서 감소하였다. 집합관에서는 DBA, SBA, PNA, sWGA반응이 성숙과 동시에 증가하나 BSL-1, RCA-1, LCA반응은 미성숙관에서 일시적으로 증가하였다. 이상의 반응으로 보아 신장발생과정에서 형태적 기능적 성숙과 함께 다양한 복합당질의 변화를 보이는데 대체로 성숙에 따라 반응이 증가하는 복합당질군과 미성숙기에 일시적으로 증가하며 성체에서 감소하는 복합당질군으로 대별할 수 있었다. 이러한 출생전후 복합당질의 변화는 신장의 기능적 성숙과정과 연관성을 가지며 발생과정에서 현저한 변화를 나타내는 복합당질은 정상 신장발생에 대한 표지인자로 유용할 것이다.

• Clinical and Experimental Pediatrics
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• 제56권10호
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• pp.446-450
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• 2013

Purpose: This study evaluated the extent of damage due to hypothermia in the mature and immature brain. Methods: Hippocampal tissue cultures at 7 and 14 days in vitro (DIV) were used to represent the immature and mature brain, respectively. The cultures were exposed at $25^{\circ}C$ for 0, 10, 30, and 60 minutes (n=30 in each subgroup). Propidium iodide fluorescent images were captured 24 and 48 hours after hypothermic injury. Damaged areas of the cornu ammonis 1 (CA1), CA3, and dentate gyrus (DG) were measured using image analysis. Results: At 7 DIV, the tissues exposed to cold injury for 60 minutes showed increased damage in CA1 (P<0.001) and CA3 (P=0.005) compared to the control group at 48 hours. Increased damage to DG was observed at 24 (P=0.008) and 48 hours (P=0.011). The 14 DIV tissues did not demonstrate any significant differences compared with the control group, except for the tissues exposed for 30 minutes in which DG showed less damage at 48 hours than the control group (P=0.048). In tissues at 7 DIV, CA1 (P=0.040) and DG (P=0.013) showed differences in the duration of cold exposure. Conclusion: The immature brain is more vulnerable to hypothermic injury than the mature brain.

• 대한수의학회지
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• 제25권2호
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• pp.187-195
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• 1985

The Present study has been carried out to elucidate the antiestrogenic effects of tamoxifen in uteri of immature rats. Immature female Sprague-Dawley rats were allocated into 4, groups and injected with $5{\mu}g$ of estradiol-$17{\beta}$, $50{\mu}g$ of tamoxifen, a combination of both or vehicle only subcutaneously three times after an interval of 24 hours respectively. The concentrations, of cytosol estradiol receptor in uterus were measured by DCC method before and 1, 3, 6, 12, 24, 48 and 72 hours after the above treatments and those of nuclear estradiol were measured by protamine exchange method 72 hours and those of nuclear estradiol were measured by protamine exchange method 72 hours after the above treatments. The results obtained were summarized as follows: 1. The binding affinity of tamoxifen to estradiol receptor in uterine cytosol was lower than that of estradiol-$17{\beta}$, accordingly the translocation of estradiol receptor into the nucleus was found to be delayed. 2. Tamoxifen caused the retention of estradiol receptor in nucleus over 24 hours and inhibited the replenishment of the receptor from nucleus to cytosol in uterus.

• Parasites, Hosts and Diseases
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• 제38권3호
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• pp.195-199
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• 2000

The 27 kDa cathepsin L-like cysteine protease of Spirometra erinocei plerocercoid is known to play an important function in tissue penetration, nutrient uptake and immune modulation in human sparganosis. In the present study, the expression of this enzyme was examined at different developmental stages of S. erinacei including immature egg, coracidium, plerocercoid in tadpole and rat, and adult Proteolytic activity against carboxybenzoyl-phenylalanyl-arginyl-7-amino-4-rnethylcournarin was do tooted in the extracts of coracidia and plerocercoid while no activity was observed in those of immature egg and adult. The specific activity in coraridial extracts was lower than that in the plerocercoid. Reverse transcription-polymerase chain reaction and Northern biol analysis demonstrated that the gene was expressed in the coracidium and plerocercoid but not in immature egg and adult. These results suggest that the 27 kDa cysteine protease is only expressed in the stages involving active migration of the parasite in the host tissue.

• Environmental Analysis Health and Toxicology
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• 제21권3호
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• pp.291-299
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• 2006

The experiments investigated whether early exposure to testosterone propionate (TP) during prepuberty alters testis development in Sprague-Dawley male rats. We performed Hershberger assay using the stimulated weanling male rats by OECD protocols, cDNA microarray, and Western blot. TP was subcutaneously injected to uncastrated Sprague-Dawley male rat of 22 days old for 10 consecutive days at doses of 0.4, 0.8, 1.0, 1.2, 1.6 mg/kg per day. At necropsy, the following tissues were removed and weighed: combined testes, epididymides (Epi), Cowper's glands (COW), levator am, and bulbocavernosus muscles (LABC), seminal vesicles, together with coagulating gland (SV) and ventral prostate (VP). We found that TP increased the weights of Epi, VP, SV, COW, and LABC, while testis was decreased in a dose-dependent manner. In cDNA microarray analysis of testis, there were significant reductions in the expression of cytochrome P450 11A (CYP11A), the rate-limiting enzyme of steroidogenesis. Taken together these results, TP exposure before puberty in male rats may produce the delay in testis development by inhibiting the CYP11A gene expression.

• Biomolecules & Therapeutics
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• 제29권2호
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• pp.144-153
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• 2021

Astrocytes play various important roles such as maintaining brain homeostasis, supporting neurons, and secreting inflammatory mediators to protect the brain cells. In aged subjects, astrocytes show diversely changed phenotypes and dysfunctions. But, the study of aged astrocytes or astrocytes from aged subjects is not yet sufficient to provide a comprehensive understanding of their important processes in the regulation of brain function. In this study, we induced an in vitro aged astrocyte model through late passage cultivation of rat primary cultured astrocytes. Astrocytes were cultured until passage 7 (P7) as late passage astrocytes and compared with passage 1 (P1) astrocytes as early passage astrocytes to confirm the differences in phenotypes and the effects of serial passage. In this study, we confirmed the morphological, molecular, and functional changes of late passage astrocytes showing aging phenotypes through SA-β-gal staining and measurement of nuclear size. We also observed a reduced expression of inflammatory mediators including IL-1β, IL-6, TNFα, iNOS, and COX2, as well as dysregulation of wound-healing, phagocytosis, and mitochondrial functions such as mitochondrial membrane potential and mitochondrial oxygen consumption rate. Culture-conditioned media obtained from P1 astrocytes promoted neurite outgrowth in immature primary cultures of rat cortices, which is significantly reduced when we treated the immature neurons with the culture media obtained from P7 astrocytes. These results suggest that late passage astrocytes show senescent astrocyte phenotypes with functional defects, which makes it a suitable model for the study of the role of astrocyte senescence on the modulation of normal and pathological brain aging.