• Title/Summary/Keyword: leydig cells

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Ultrastructural Study on the Differentiation of the Rat Testis (흰쥐 정소(精巢)의 분화(分化)에 관한 미세구조적(微細構造的) 연구(硏究))

  • Deung, Young-Kun;Kim, Wan-Jong;Chung, In-Duk
    • Applied Microscopy
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    • v.16 no.2
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    • pp.75-91
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    • 1986
  • Differentiation of the rat testis was studied by light and electron microscope from the fetal stage up to the newborn or adult stage. The purpose of the present study is to investigate the ultrastructural changes of seminiferous tubules and interstitial tissue during the developmental process. The results were as follows: the seminiferous tubule diameter began to increase from birth and was fully developed at 30 to 40 days of age through intratubular cell proliferations. Basement membrane and myoid cells lining the seminiferous tubules were differentiated at 17 days gestation. At the fetal stage, seminiferous tubules were primarily composed of Sertoli cells and the differentiation of Sertoli and germ cells progressed from the newborn stage. Spermatids and immature spermatozoa are appeared at 40 days of age, so from this time, spermatogenesis occurred actively until the adult stage. Sertoli cells aided germ cell differentiation and phagocytosed the parts of the spermatid cytoplasm. Leydig ce]] development follows a biphasic pattern: a fetal phase and then an adult phase from 20 days of age. In conclusion, the rat testis is already developed to some extent by the fetal stage and is functional after 50 days of age. Therefore, these findings indicate that differentiation of Sertoli and Leydig cells precedes the onset of spermatogenesis.

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Ultrastructure and Role of Somatic Cells in Macrobrachium nipponense Testis (징거미새우, Macrobrachium nipponense 정소 구성세포의 미세구조와 기능)

  • KIM Dae-Hyun;KANG Jung-Ha;HAN Chang-Hee
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.33 no.5
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    • pp.403-407
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    • 2000
  • Ultrastructure and function of testis somatic cells in freshwater prawns Macrobrachium nipponense were studied. The paired testes of the prawn were elongated, united at their anterior end, which lay between the dorsal surface of the hepatopancreas and the heart. Each testis consisted of a large number of seminiferous cords compactly held together by connective tissue. A seminiferous cord was composed of an outer layer of simple squamous epithelium, a basement membrane, the closely packed germ cells and sustentacular cells of the germinal ridge, and an inner layer of simple cuboidal epithelial cells. Leydig cell-like cells in an angular areas filling the space of the seminiferous cords were observed. The nuclei of leydig cell-like cells were characterized by a distinct nucleolus. The simple squamous epithelial layer was composed of flattened cells tying on a basement membrane. The nuclei of the flattened cells were often overlapped in a layer, and the cytoplasm of the cells was observed just near the nuclei. The sustentacular cells were complex in morphology. These cells had relatively small cell bodies from which long cytoplasmic extensions ramified reached the space of germ cells in the germinal ridge. The nuclei of sustentacular cells usually exhibited angular profiles and located most commonly at the periphery of the cords. Cells of simple cuboidal epithelium located between germinal ridge and lumen of seminiferous cord, and part of the cells were adjacent to basal lamina, The cuboidal epithelial cells contained numerous mitochondria, the well-developed rER, the well-developed Golgi complex, and irregularly shaped nuclei. Transition vesicles appeared on the cis side of the Golgi complex. The large vesicles on the trans side of the complex appeared to fuse to form a membrane-bound structure. A number of pits on the cell apex suggested exocytotic activity for secretion of the sperm supporting matrix.

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Differential Expressions of Aquaporin Subtypes in the Adult Mouse Testis

  • Mohamed, Elsayed A.;Im, Ji Woo;Kim, Dong-Hwan;Bae, Hae-Rahn
    • Development and Reproduction
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    • v.26 no.2
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    • pp.59-69
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    • 2022
  • Many efforts have been made to study the expression of aquaporins (AQP) in the mammalian reproductive system, but there are not enough data available regarding their localized expression to fully understand their specific roles in male reproduction. The present study investigated the expression and localization patterns of different AQP subtypes in the adult mouse testes and testicular spermatozoa using an immunofluorescence assay. All the studied AQPs were expressed in the testes and revealed subtype-specific patterns in the intensity and localization depending on the cell types of the testes. AQP7 was the most abundant and intensive AQP subtype in the seminiferous tubules, expressing in Leydig cells and Sertoli cells as well as all stages of germ cells, especially the spermatids and testicular spermatozoa. The expression pattern of AQP3 was similar to that of AQP7, but with higher expression in the basal and lower adluminal compartments rather than the upper adluminalcompartment. AQP8 expression was limited to the spermatogonia and Leydig cells whereas AQP9 expression was exclusive to tails of the testicular spermatozoa and elongated spermatids. Taken together, the abundance and distribution of the AQPs across the different cell types in the testes indicating to their relavance in spermatogenesis, as well as in sperm maturation, transition, and function.

Effects of nandrolone decanoate on expression of steroidogenic enzymes in the rat testis

  • Min, TaeSun;Lee, Ki-Ho
    • Asian-Australasian Journal of Animal Sciences
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    • v.31 no.5
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    • pp.658-671
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    • 2018
  • Objective: Nandrolone decanoate (ND) is an anabolic-androgenic steroid frequently used for clinical treatment. However, the inappropriate use of ND results in the reduction of serum testosterone level and sperm production. The suppressive effect of ND on testosterone production has not been investigated in detail. The present study was designed to examine the effect of ND on the expression of steroidogenic enzymes in the rat testis. Methods: Male Sprague Dawley rats at 50 days of age were subcutaneously administrated with either 2 or 10 mg of ND/kg body weight/week for 2 or 12 weeks. The changes of transcript and protein levels of steroidogenic enzymes in the testis were determined by real-time polymerase chain reaction and western blotting analyses, respectively. Moreover, immunohistochemical analysis was employed to determine the changes of immunostaining intensity of these enzymes. The steroidogenic enzymes investigated were steroidogenic acute regulatory protein, cytochrome P450 side chain cleavage enzyme, $17{\alpha}-hydroxylase$, $3{\beta}-hydroxysteroid$ dehydrogenase, and cytochrome P450 aromatase. Results: The treatment of ND resulted in depletion of Leydig cells and sloughing of germ cells in the testis. The ND treatment caused significant expressional decreases of steroidogenic enzymes at transcript and protein levels, and the destructive effects of ND on the testis were more apparent with a higher dose and a longer period of the treatment. Evident reduction of immunostaining intensity present in Leydig cells was clearly detected by the ND treatment. Conclusion: The exposure to ND in young male results not only in histological changes of the testis but also in aberrant gene expression of testicular steroidogenic enzymes, consequently leading into the reduction of testosterone production in the testis and thus likely disruption of spermatogenesis.

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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Effects of 6-aminonicotinamide on the Testes of Golden Hamster (6-Aminonicotinamide가 햄스터의 정소에 미치는 영향)

  • Lee, Jin-Suk;Choi, Byoung-Young;Kim, Dong-Heui;Jung, Won-Sug;Cho, Byung-Pil;Yang, Young-Chul
    • Applied Microscopy
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    • v.38 no.3
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    • pp.205-212
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    • 2008
  • In this study morphological changes of the testes of golden hamsters treated with 6-aminonicotinamide (6-AN, 10 mg/kg body weight) in every two days were investigated using light and transmission electron microscopes. After the 7th injection of 6-AN, body weights of hamsters were significantly reduced, and the weight of testes were markedly reduced in the group of hamsters after 5th injections. Degeneration of seminiferous epithelium appeared first in the group receiving 5th injections, which were followed by severe degenerations after the 9th injection. In the degenerated seminiferous epithelium, deep vacuolization, and destruction of spermatogenic cells and Sertoli cells were also oberved. Multinuclear giant cells were also observed in the lumen of destructed seminiferous epithelium. But there were no edematous changes in the interstitial tissue, and the Leydig cells were found to be relatively intact. Therefore, these results show that 6-AN trigger severe morphological alteration of the spermatogenic cells and Sertoli cells, however Leydig cells are unaltered by 6-AN.