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S V Garde

Publications and source records attributed to S V Garde.

32 records · Page 2Linked to original sources
PubMed1991

De novo biosynthesis and localization of inhibin in marmoset (Callithrix jacchus) and rat epididymis.

Using specific polyclonal antibodies generated against a 13 Kd human testicular inhibin, immunocytochemical localization was carried out in epididymis of intact and castrated marmoset monkey and rat epididymis. Inhibin was found to be present in the cytoplasm of epithelial cells of caput, corpus and cauda epididymis. The intensity of staining and pattern of distribution did not change following castration. Further, the in vitro biosynthesis of inhibin studied by incorporating 3H-leucine and precipitating it with specific antibody indicated maximum biosynthesis in the corpus epididymis in case of marmosets and cauda in case of rats. Following castration in rats, the epididymal tissue still retained the capacity to biosynthesize inhibin. These studies indicate that marmoset and rat epididymis are capable of biosynthesizing/absorbing inhibin and whose synthesis does not depend on androgens.

Animals↗
PubMed1991

Endometrium--an extragonadal source of inhibin.

Using polyclonal antibodies generated against human seminal plasma inhibin (10.5 KDa), immunocytochemical localization was carried out in paraffin embedded tissue sections of human endometrial biopsies obtained at various phases of the menstrual cycle. A positive reaction which indicated the presence of inhibin was characterized by the presence of golden yellow or brown colour in the cytoplasm of epithelial cells that formed the glands as well as the luminal lining. The stromal cells however, showed negative staining. In early proliferative phase, the endometrial glands exhibited weak positive staining for inhibin which gradually increased and was intense in late follicular and early secretory phases. The intensity of the staining although was not diminished in the glandular epithelium in the mid as well as late secretory phases, the number of cells showing positive staining appeared to be reduced. Incubation of endometrial biopsies in vitro with labelled amino acid and immunoprecipitation of newly synthesized protein with specific antibodies to inhibin indicated that endometrium is capable of de novo synthesizing inhibin. The above results suggest that endometrium is an extra ovarian source of inhibin and the possible role of endometrial peptide in sperm fertilizing capabilities as well as in pre and post implantation events is suggested.

Adolescent↗
PubMed1991

Prostate--a novel target for evaluation of FSH modulating peptides.

Effects of prostatic inhibin peptide and its synthetic fragments on FSH biosynthesis by the human pituitary and prostate, were examined in vitro. The results showed that FSH biosynthesis by prostatic tissue is modulated by these peptides in a similar fashion to that observed at the pituitary level.

Amino Acid Sequence↗
PubMed1990

Immunocytochemical localisation of follicle stimulating hormone (FSH) in normal, benign and malignant human prostates.

Immunocytochemical localisation of follicle stimulating hormone (FSH) was carried out in normal, benign and malignant human prostates by indirect immunoperoxidase technique. Positive staining was observed in the epithelial cells of all the three categories, while the stromal cells showed a weakly positive reaction in a few specimens. The brown reaction product was dispersed in the cytoplasm of the epithelial cells. These observations demonstrate the presence of immunoreactive FSH-like peptide in human prostate. The significance of FSH in the aetiopathology of prostatic disorders is discussed.

Adolescent↗
PubMed1989

Immunoperoxidase localization of prostatic inhibin peptide in human, monkey, dog, and rat prostates.

A comparative study on the localization of prostatic inhibin peptide was carried out by the immunoperoxidase technique in prostates of humans, bonnet and langur monkeys, marmosets, dogs, and rats. A positive reaction was observed in the prostatic epithelial cells of humans, in all three species of monkeys, and in the rat, while the dog prostate did not exhibit any reaction. These observations indicate a close immunological similarity among human, monkey, and rat prostatic inhibin peptides.

Animals↗
PubMed1989

Localization of inhibin in testes of human, bonnet monkey, dog and rat by immunoperoxidase technique.

Immunocytochemical study on the localization of inhibin in the testes of human, bonnet monkey, dog and rat was carried out using indirect immunoperoxidase technique, in order to investigate the cell types involved in inhibin production/storage. A positive reaction was observed in the testes of human, monkey and dog while it was negative in rat testis using specific antiserum to human testicular inhibin generated against homogeneous preparation of human testicular inhibin in our laboratory. Inhibin was found to be localized in Sertoli cells, spermatogonia and primary spermatocytes of human, monkey and dog testes. A weak positive reaction was observed in spermatids of human testis only. Interestingly, Leydig cells of human, monkey and dog testes showed positive reaction indicating presence of inhibin in these cells also.

Animals↗
PubMed1988

Localization of inhibin in human testes by immunoperoxidase technique.

Immunohistological studies on the localization of inhibin in human testes were carried out to investigate the cell types involved in inhibin synthesis/storage. The paraffin embedded testicular tissues were stained by an indirect immunoperoxidase technique. Specific antiserum to human testicular inhibin generated against the homogenous preparation of human testicular inhibin at our laboratory was used as the first antibody. Inhibin was found to be localized in Sertoli cells, spermatogonia, and primary spermatocytes. A weak positive reaction was also observed in spermatids. Interestingly, Leydig cells showed positive reaction indicating presence of inhibin in these cells too.

Humans↗
PubMed1987

Inhibin-like material--an immunohistologic marker for prostatic origin of metastases.

Immunocytochemical localization of inhibin-like material (ILM) using a specific antiserum generated against ILM of prostatic origin was carried out in metastatic lymph nodes of known primary prostatic tumours and in rectal biopsies showing direct invasion with known prostatic carcinoma. Nine of the 11 metastatic lymph nodes gave positive reaction, which was readily apparent in differentiated tumours showing micro-acinar formation. In poorly differentiated tumours it was often focal and indicated intracytoplasmic staining within randomly scattered cells. Rectal biopsies showing invasion of prostatic carcinoma (4 cases) also showed positive reaction for ILM. Using this experimental protocol, the reaction for metastatic lesions from patients with non-prostatic carcinomas was completely negative indicating the specificity of the test for prostatic origin of metastasis. In conclusion, the present investigation indicates the potential application of ILM in confirming or excluding the prostatic origin of invasive tumour in metastatic lesions.

Humans↗
PubMedDate not supplied

Inhibin: unity in diversity.

Historically, inhibin was thought to be a testicular hormone involved in the regulation of pituitary FSH by a negative feedback control. The ability of inhibin to preferentially suppress FSH without affecting LH triggered extensive research for its possible use as a male contraceptive, suggesting a plurality of molecular forms and a multiplicity of biological actions of this putative hormone. It also became evident that inhibin is not unique to the testis, as presumed earlier, and can even be obtained from the ovary. This has necessitated a fundamental revision of the original concept of inhibin. Unfortunately, not many perceive inhibin as a loose conglomerate of structurally dissimilar, FSH-suppressing proteins and insist on singling out a 32-kDa protein derived from ovarian follicular fluid to be designated as inhibin. This article highlights features common to two distinctly different types of inhibin: seminal inhibin and ovarian inhibin. Evidence is also provided to indicate that the term inhibin need not be specific to the ovarian protein, but encompasses proteins hitherto dismissed as inhibin-like or inhibin-related proteins.

Animals↗
PubMedDate not supplied

Immunocytochemical localization of bioregulatory peptides in marmoset testes.

Immunocytochemical localization of neuropeptides (beta-endorphin, substance P, arginine vasopressin, oxytocin), pituitary hormones (adrenocorticotropin, prolactin, growth hormone, follicle stimulating hormone (FSH), gonadal inhibin, gastrin, and human chorionic gonadotrophin (hCG)) was carried out in marmoset testis during development. Both intensity of immunostaining and distribution of these peptides in testicular compartments viz. seminiferous tubules and Leydig cells changed dramatically during development. In vitro biosynthesis of inhibin and FSH was increased by hCG, whereas prolactin (5 micrograms) and prostatic inhibin peptide suppressed the synthesis of these hormones.

Aging↗
PubMedDate not supplied

Occurrence of FSH, inhibin and other hypothalamic-pituitary-intestinal hormones in normal fertility, subfertility, and tumors of human testes.

OBJECTIVE: To compare the distribution of peptide hormones in presumably normal human testicular tissues and specimens exhibiting any of five pathologies. METHODS: Biopsies from patients having testicular malfunctions were prepared as sections and specifically immunohistochemically stained for inhibin, FSH, serotonin, AUP, and oxytocin. RESULTS: Immunocytochemical studies revealed the presence of various hypophysial-pituitary-intestinal hormones, viz., FSH, inhibin, arginine vasopressin (AVP), calcitonin, serotonin, oxytocin, adrenocorticotropin (ACTH), gastrin, secretin, and somatostatin in human testicular biopsies exhibiting normal spermatogenesis, Sertoli-cell-only syndrome, spermatogenic arrest, Leydig cell hyperplasia, Leydig cell tumor, and seminoma. Intensity of immunostaining for all peptides except FSH was stronger in cases of subfertile as compared to normal testis. Intensity of immunostaining with inhibin was maximum in Leydig cell tumor. CONCLUSION: These regulatory peptides may be involved in the pathophysiology of the testes.

Arginine Vasopressin↗