scholarly journals Macro and Micro Anatomical Observation on the Testes of Local Dog (Canis lupusfamiliaris) of Assam

2022 ◽  
Author(s):  
A. Deka ◽  
D. Kalita ◽  
K.B. Devchoudhury ◽  
J. Kachari ◽  
R.J. Deka ◽  
...  
Keyword(s):  
Sertoli Cells ◽  
Germplasm Conservation ◽  
Standard Technique ◽  
Staining Technique ◽  
Seminiferous Tubules ◽  
Veterinary Science ◽  
Connective Tissue Layer ◽  
Tissue Samples ◽  
Spherical Nuclei ◽  
One Year

Background: The study on testes of local dog of Assam is of great value in regard to germplasm conservation. The aim of the study was to evaluate the gross and histomorphological examination of testes of male reproductive system. Methods: The testes were collected at the time of castration from Department of Surgery and Radiology, College of Veterinary Science, Assam Agricultural University, Khanapra, Guwahati, Assam, India. The research was carried out for a period of one year in Department of Anatomy and Histology, College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati, Assam. Then gross anatomical studies were made on it and the tissue samples were fixed in 10% neutral buffered formalin solution and were processed as per the standard technique of procedure (Luna, 1968). The paraffin blocks were sectioned in Shandon Finesse microtome at 5 µm thickness and the sections were stained with Mayer’s Haematoxylin and Eosin staining technique for Cellular details as per the method of Luna (1968). Result: Grossly, the testes of local dog consisted of two surface viz., lateral and medial and two ends i.e. upper end and lower end. The upper end of the testes was occupied by the head of the epididymis and the lower end of the testes was occupied by the tail of the epididymis. Mediastinum testis was observed in the centre of testes of local dog. Histologically, the testes were covered by serous layer (Tunica vaginalis), connective tissue layer (Tunica albugenia) and vascular layer (Tunica vasculosa) from outside to inwards. Spermatogenic cells like spermatogonia, primary spermatocytes, secondary spermatocytes, spermatids and spermatozoa, and sertoli cells were observed in seminiferous tubules. The sertoli cells were attached to the basement membrane of seminiferous tubules. Cluster of Leyding cells were found between the semineniferous tubules and it contained large spherical nuclei. The epididymides were lined by pseudo stratified ciliated columnar epithelium.

scholarly journals Microscopic Features of Gonadally Inactive Testis of Khaki Campbell Duck (Anas platyrhynchos domesticus) in Bangladesh

2021 ◽  
Vol 9 (1) ◽  
pp. 146-149
Author(s):  
Papia Khatun ◽  
Ziaul Haque ◽  
Shonkor Kumar Das
Keyword(s):  
Leydig Cells ◽  
Anas Platyrhynchos ◽  
Relative Increase ◽  
Seminiferous Tubules ◽  
Interstitial Tissue ◽  
Tissue Samples ◽  
Microscopic Features ◽  
One Year ◽  
Khaki Campbell Ducks ◽  
First Time

The microscopic features of the testis were studied in gonadally inactive Khaki Campbell duck (Anas platyrhynchos domesticus) in Bangladesh. The study was conducted in the Department of Anatomy & Histology, Bangladesh Agricultural University, Mymensingh. Five adult healthy birds of one-year-old were used for this study. The testes were collected immediately after ethical killing of the birds for histological observations. The collected tissue samples were then processed and stained with Hematoxylene & Eosin (H & E) stain for histological observations. The seminiferous tubules showed considerable involution with cessation of spermatogenesis. The basal lamina of the seminiferous tubules was irregular in outline and was invaginated into the germinal epithelium in the form of finger-like plicae or folds. Most of the lumen of the seminiferous tubules was empty and all generation of germ cells were not present in most of the seminifeous tubules. The interstitium showed a relative increase in volume and interstitial tissue consisted of loose connective tissue, interstitial cells (Leydig cells), few connective cells and blood vessels. This study first time described the microscopic features of testis of Khaki Campbell ducks in Bangladesh during inactive phases of the reproductive cycle.

Sex chimaerism, fertility and sex determination in the mouse

Development ◽  
1991 ◽  
Vol 113 (1) ◽  
pp. 311-325 ◽  
Author(s):  
C.E. Patek ◽  
J.B. Kerr ◽  
R.G. Gosden ◽  
K.W. Jones ◽  
K. Hardy ◽  
...  
Keyword(s):  
Sex Determination ◽  
Sertoli Cells ◽  
Leydig Cells ◽  
Sex Chromosome ◽  
Tunica Albuginea ◽  
In Situ Hybridisation ◽  
Ovarian Surface Epithelium ◽  
Surface Epithelium ◽  
Seminiferous Tubules ◽  
Coelomic Epithelium

Adult intraspecific mouse chimaeras, derived by introducing male embryonal stem cells into unsexed host blastocysts, were examined to determine whether gonadal sex was correlated with the sex chromosome composition of particular cell lineages. The fertility of XX in equilibrium XY and XY in equilibrium XY male chimaeras was also compared. The distribution of XX and XY cells in 34 XX in equilibrium XY ovaries, testes and ovotestes was determined by in situ hybridisation using a Y-chromosome-specific probe. Both XX and XY cells were found in all gonadal somatic tissues but Sertoli cells were predominantly XY and granulosa cells predominantly XX. The sex chromosome composition of the tunica albuginea and testicular surface epithelium could not, in general, be fully resolved, owing to diminished hybridisation efficiency in these tissues, but the ovarian surface epithelium (which like the testicular surface epithelium derives from the coelomic epithelium) was predominantly XX. These findings show that the claim that Sertoli cells were exclusively XY, on which some previous models of gonadal sex determination were based, was incorrect, and indicate instead that in the mechanism of Sertoli cell determination there is a step in which XX cells can be recruited. However, it remains to be established whether the sex chromosome constitution of the coelomic epithelium lineage plays a causal role in gonadal sex determination. Male chimaeras with XX in equilibrium XY testes were either sterile or less fertile than chimaeras with testes composed entirely of XY cells. This impaired fertility was associated with the loss of XY germ cells in atrophic seminiferous tubules. Since this progressive lesion was correlated with a high proportion of XX Leydig cells, we suggest that XX Leydig cells are functionally defective, and unable to support spermatogenesis.

scholarly journals Attempted Control of Paratuberculosis in Dairy Calves by Only Changing the Quality of Milk Fed to Calves

Animals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2569
Author(s):  
Pamela Steuer ◽  
Carlos Tejeda ◽  
Manuel Moroni ◽  
Cristobal Verdugo ◽  
Michael Thomas Collins ◽  
...  
Keyword(s):  
Copper Ion ◽  
Study Groups ◽  
Dairy Calves ◽  
Milk Replacer ◽  
Tissue Samples ◽  
Infection Transmission ◽  
Control Programs ◽  
Infected Adult ◽  
Mycobacterium Avium Subsp Paratuberculosis ◽  
One Year

One of the important routes of Mycobacterium avium subsp. paratuberculosis (MAP) transmission in dairy calves is milk. The aim of the present study was to assess the efficacy of milk treatments to prevent MAP infection transmission to calves. A one-year longitudinal study was carried out. Newborn calves were assigned to one of four experimental groups: 5 calves received naturally MAP-contaminated milk, 5 calves received copper treated milk, 4 calves were fed calf milk replacer, and 3 were fed UHT pasteurized milk. MAP load in milk was estimated. Infection progression was monitored monthly. After one year, calves were euthanized, and tissue samples were cultured and visually examined. MAP was undetectable in milk replacer and UHT milk. Copper ion treatment significantly reduced the number of viable MAP in naturally contaminated milk. Fecal shedding of MAP was observed in all study groups but began earlier in calves fed naturally contaminated milk. Paratuberculosis control programs must place multiple hurdles between the infection source, MAP-infected adult cows, and the most susceptible animals on the farm, young calves. As our study shows, strict dependence on a single intervention to block infection transmission, no matter how important, fails to control this insidious infection on dairy farms.

scholarly journals HDR brachytherapy and supervoltage external beam therapy of cervical cancer: Protection of the intestinal tract during the treatment

2002 ◽  
Vol 10 (1) ◽  
pp. 13-17 ◽  
Author(s):  
Sasa Ljubenkovic
Keyword(s):  
Small Bowel ◽  
Standard Technique ◽  
Acute Radiation ◽  
Watery Diarrhoea ◽  
Radiation Enteritis ◽  
High Dose ◽  
Non Invasive ◽  
Dose Volume ◽  
Patient Table ◽  
One Year

BACKGROUND: During radiotherapy in most of the irradiated patients occur the symptoms of acute radiation enteritis, less frequently cystitis or proctitis. The aim of this work was to apply non invasive exclusion methods to reduce the small bowel volume within the pelvic high dose volume and indirectly to reduce the number and severity of acute radiation enteritis METHODS: A total number of 183 patients were enrolled in our prospective randomised investigation we performed at the Clinic of Oncology in Knez Selo during one year. Ninety patients from E-group were irradiated with the standard technique two opposite parallel fields on the Mevatron-7445 linear accelerator (SIEMENS) patient-table, while 93 from C-group were irradiated under special conditions on our unique patient-table (PT) manufactured at our special demands by the Jugorendgen Ei-Ni? factory Brachytherapy was administered with RALT technique in both groups with isotope machine BUCHLER. RESULTS: Individual application of exclusion techniques led to protection of over 50% of the small bowel (118-1065 cm3) in 30/43 (70%) patients, and even in 10/43 (23%) more than 90% of the small bowel was protected (118-835 cm3), which would otherwise be irradiated with conventional techniques. None of the patients from E-group (out of 90) had more than 8 stools a day (G3), while in C-group there were 20 such cases Seventy-seven percent of the patients from E-group had formed stool, while the percent in C-group was 29. In C-group 40% of the patients had so called "watery stools"; in E-group the percent was 4. Out of 53 patients from K-group with mobile small bowel, 21 (40%) had "watery diarrhoea". CONCLUSION: Measures to prevent radiation enteritis should be taken before (surgical) or during (non invasive) radiotherapy. At the Clinic of Oncology in Knez Selo, individual application of small bowel exclusion techniques using the unique patient-table (JUGORENDGEN Ei-Ni?) led to protection of the small bowel during radiotherapy of uterine malignancies, which was reflected in a significantly reduced number and severity of acute enteritis symptoms.

scholarly journals An Insight into Histopathologic Examination as a Gold Standard for the Diagnosis of Chronic Apical Periodontitis

2018 ◽  
Vol 64 (1) ◽  
pp. 34-38 ◽  
Author(s):  
Monica Monea ◽  
Anca Maria Pop ◽  
Veronica Grozescu ◽  
Alexandra Stoica ◽  
Simona Mocanu ◽  
...  
Keyword(s):  
Gold Standard ◽  
Standard Technique ◽  
Final Diagnosis ◽  
Apical Periodontitis ◽  
Histologic Examination ◽  
Chi Square ◽  
Histologic Diagnosis ◽  
Tissue Samples ◽  
Significant Difference ◽  
The Status

AbstractObjective: The purpose of our study was to determine the level of correlation between histopathologic results after surgery for chronic apical periodontitis and the radiographic and clinical diagnosis. The status of gold standard technique of histologic examination was evaluated in the diagnosis of apical radiolucency in necrotic teeth.Methods: Out of 154 patients with incorrect root fillings and apical radiolucency included in an endodontic retreatment protocol, 87 patients (108 teeth) were scheduled for apical surgery at 3-6 months control recall. Clinical and radiographic exams were completed prior to surgery and compared to the histological results of apical biopsies. The collected data were statistically analyzed with the SPSS version 20.0 and the Chi-square test was used to determine the associations between clinical and histologic diagnosis. A value of p <0.05 was considered statistically significant.Results: There was a statistically significant difference between the number of cases diagnosed as granulomas or cysts during clinical and radiological evaluation compared to histologic evaluation of tissue samples, with 40.9% to 75.9% and 54.2% to 16.8% respectively (p<0.05).Conclusions: The final diagnosis was obtained only after histologic examination of apical tissue samples, which means that the observations made based on radiologic investigations must be confirmed by biopsy.

scholarly journals Regulation of GDNF expression in Sertoli cells

Reproduction ◽  
2019 ◽  
Author(s):  
Parag Parekh ◽  
Thomas Xavier Garcia ◽  
Marie-claude Hofmann
Keyword(s):  
Germ Cell ◽  
Sertoli Cells ◽  
Seminiferous Tubules ◽  
Receptor Complex ◽  
Myoid Cells ◽  
Self Renewal ◽  
Cell Proliferation And Differentiation ◽  
Proliferation And Differentiation ◽  
Direct Cell ◽  
Ability To Drive

Sertoli cells regulate male germ cell proliferation and differentiation and are a critical component of the spermatogonial stem cell (SSC) niche, where homeostasis is maintained by the interplay of several signaling pathways and growth factors. These factors are secreted by Sertoli cells located within the seminiferous epithelium, and by interstitial cells residing between the seminiferous tubules. Sertoli cells and peritubular myoid cells produce glial cell line-derived neurotrophic factor (GDNF), which binds to the RET/GFRA1 receptor complex at the surface of undifferentiated spermatogonia. GDNF is known for its ability to drive SSC self-renewal and proliferation of their direct cell progeny. Even though the effects of GDNF are well studied, our understanding of the regulation its expression is still limited. The purpose of this review is to discuss how GDNF expression in Sertoli cells is modulated within the niche, and how these mechanisms impact germ cell homeostasis.

scholarly journals Minireview: Transcriptional Regulation of Gonadal Development and Differentiation

Endocrinology ◽  
2005 ◽  
Vol 146 (3) ◽  
pp. 1035-1042 ◽  
Author(s):  
Susan Y. Park ◽  
J. Larry Jameson
Keyword(s):  
Germ Cells ◽  
Sertoli Cells ◽  
Leydig Cells ◽  
Cell Types ◽  
Gonadal Development ◽  
Targeted Mutagenesis ◽  
Seminiferous Tubules ◽  
Molecular Pathways ◽  
Theca Cells ◽  
Main Cell

The embryonic gonad is undifferentiated in males and females until a critical stage when the sex chromosomes dictate its development as a testis or ovary. This binary developmental process provides a unique opportunity to delineate the molecular pathways that lead to distinctly different tissues. The testis comprises three main cell types: Sertoli cells, Leydig cells, and germ cells. The Sertoli cells and germ cells reside in seminiferous tubules where spermatogenesis occurs. The Leydig cells populate the interstitial compartment and produce testosterone. The ovary also comprises three main cell types: granulosa cells, theca cells, and oocytes. The oocytes are surrounded by granulosa and theca cells in follicles that grow and differentiate during characteristic reproductive cycles. In this review, we summarize the molecular pathways that regulate the distinct differentiation of these cell types in the developing testis and ovary. In particular, we focus on the transcription factors that initiate these cascades. Although most of the early insights into the sex determination pathway were based on human mutations, targeted mutagenesis in mouse models has revealed key roles for genes not anticipated to regulate gonadal development. Defining these molecular pathways provides the foundation for understanding this critical developmental event and provides new insight into the causes of gonadal dysgenesis.

Transpyloric Feeding in the Newborn: Use in Neonates with and without Respiratory Failure

1983 ◽  
Vol 28 (4) ◽  
pp. 347-349 ◽  
Author(s):  
M. Mulla ◽  
I. Mitchell
Keyword(s):  
Body Weight ◽  
Intensive Care ◽  
Respiratory Failure ◽  
Respiratory Disease ◽  
Low Birthweight ◽  
Standard Technique ◽  
Respiratory Illness ◽  
Maternity Hospital ◽  
Major Complications ◽  
One Year

In a peripheral maternity hospital providing Intensive Care for 5274 deliveries per annum, NJ feeding was attempted, in one year, in 57 neonates. One third of these weighed less than 1500 g at birth and 41 (71.9%) had respiratory disease. A standard technique, and a commercially available tube was used, and the tube was passed to the jejunum within 24 hours in 46 (80.7%) of the babies. NJ feeding was continued for varying periods, up to 50 days. The volume of milk given varied with the duration of the feed but feeds of up to 244 ml of milk/Kg body weight/day were achieved. Thirty-eight (66.6%) of the babies regained their birthweight by 20 days and major complications were uncommon. We have shown that NJ feeding can be used in low birthweight babies with serious respiratory illness, even when resources are limited.

Developmental stage- and spermatogenic cycle-specific expression of transcription factor GATA-1 in mouse Sertoli cells

Development ◽  
1994 ◽  
Vol 120 (7) ◽  
pp. 1759-1766 ◽  
Author(s):  
K. Yomogida ◽  
H. Ohtani ◽  
H. Harigae ◽  
E. Ito ◽  
Y. Nishimune ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Developmental Stage ◽  
Sertoli Cell ◽  
Germ Cells ◽  
Sertoli Cells ◽  
Transcriptional Activation ◽  
Germ Line ◽  
Mouse Testis ◽  
Seminiferous Tubules ◽  
Specific Expression

GATA-1 is an essential factor for the transcriptional activation of erythroid-specific genes, and is also abundantly expressed in a discrete subset of cells bordering the seminiferous epithelium in tubules of the murine testis. In examining normal and germ-line defective mutant mice, we show here that GATA-1 is expressed only in the Sertoli cell lineage in mouse testis. GATA-1 expression in Sertoli cells is induced concomitantly with the first wave of spermatogenesis, and GATA-1-positive cells are uniformly distributed among all tubules during prepubertal testis development. However, the number of GATA-1-positive cells declines thereafter and were found only in the peripheral zone of seminiferous tubules in stages VII, VIII and IX of spermatogenesis in the adult mouse testis. In contrast, virtually every Sertoli cell in mutant W/Wv, jsd/jsd or cryptorchid mice (all of which lack significant numbers of germ cells) expresses GATA-1, thus showing that the expression of this transcription factor is negatively controlled by the maturing germ cells. These observations suggest that transcription factor GATA-1 is a developmental stage- and spermatogenic cycle-specific regulator of gene expression in Sertoli cells.

scholarly journals Colorectal Cancer Study with Nanostructured Sensors: Tumor Marker Screening of Patient Biopsies

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 606 ◽  
Author(s):  
Michele Astolfi ◽  
Giorgio Rispoli ◽  
Gabriele Anania ◽  
Veronica Nevoso ◽  
Elena Artioli ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Principal Component ◽  
Human Colon ◽  
Diagnostic Methods ◽  
Human Colon Cancer ◽  
Discrimination Power ◽  
Tissue Samples ◽  
Chemoresistive Sensors ◽  
One Year ◽  
Nanostructured Sensors

Despite the great progress in screening techniques and medical treatments, colorectal cancer remains one of the most widespread cancers in both sexes, with a high death rate. In this work, the volatile compounds released from human colon cancer tissues were detected by a set of four different chemoresistive sensors, made with a nanostructured powder of metal-oxide materials, inserted into an innovative patented device. The sensor responses to the exhalation of a primary cancer sample and of a healthy sample (both of the same weight, collected during colorectal surgery from the intestine of the same patient) were statistically analyzed. The sensors gave reversible, reproducible, and fast responses for at least one year of continuous use, making them quite superior in respect to the existing diagnostic methods. Preliminary results obtained using principal component analysis of the sensor responses to samples removed from 13 patients indicate that the nanostructured sensors employed in this study were able to distinguish between healthy and tumor tissue samples with coherent responses (the discrimination power of the most sensitive sensor was about 17%), highlighting a strong potential for clinical practice.

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