Neuroendocrinology
Department of Anatomy, School of Medicine, University of Patras, Patras, Greece.
Published: November 2008
Background/aims: Recent knowledge indicates that neurotrophins play a significant role in neuroendocrine systems through their specific receptors TrkA, TrkB, TrkC and low-affinity p75(NTR) receptor. TrkA and TrkB receptors have been previously detected in numerous endocrine cells in human anterior pituitary and adenomas. In the present study, the localization of p75(NTR) and TrkC along with TrkA and TrkB receptors was investigated.
Methods: Semi-serial paraffin-embedded sections of 5 human normal pituitaries and 30 adenomas were immunostained using specific antibodies.
Results: Expression of p75(NTR) receptor was demonstrated in the intricate capillary and reticulin network in the anterior pituitary and in the pericapillary tissue and pituicytes in the posterior lobe. p75(NTR) immunoreactivity was absent from all adenomas. In normal anterior pituitary, a few scattered cells showed weak TrkC immunoreactivity in contrast to a high percentage of endocrine cells distributed throughout the pars distalis and pars intermedia which exhibited strong TrkA and/or intermediate TrkB immunoreactivity. Double immunohistochemistry demonstrated TrkA immunoreactivity in more than 80% of lactotropes and 70% of corticotropes and to a lesser extent in other cell types. Furthermore, in the majority of adenomas, independently of type, sex and age, a high percentage of TrkA- and/or TrkB-positive cells was detected. Interestingly, TrkC expression appeared to be increased in some adenomas compared to normal pituitary. Endothelial cells and perivascular connective tissue were always TrkB-immunostained.
Conclusion: The above findings support a potential role of all neurotrophins, through their different receptors, in pituitary functions.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1159/000119743 | DOI Listing |
Cytotechnology
February 2025
Division of Neurobiology, Department of Zoology, The Maharaja Sayajirao University of Baroda, Vadodara, Gujarat India.
Tumor necrosis factor alpha (TNF-α) is a well-known pro-inflammatory cytokine originally recognized for its ability to induce apoptosis and cell death. However, recent research has revealed that TNF-α also plays a crucial role as a mediator of cell survival, influencing a wide range of cellular functions. The signaling of TNF-α is mediated through two distinct receptors, TNFR1 and TNFR2, which trigger various intracellular pathways, including NF-κB, JNK, and caspase signaling cascades.
View Article and Find Full Text PDFInt J Mol Sci
December 2024
Department of Otorhinolaryngology, Medical University Innsbruck, 6020 Innsbruck, Austria.
We determined the relative expression levels of the receptors , , , and and ligands , , , and with RNAseq analysis on fetal human inner ear samples, located TrkB and TrkC proteins, and quantified with in situ hybridization on histological sections between gestational weeks (GW) 9 to 19. Spiral ganglion neurons (SGNs) and satellite glia appear to be the main source of and synthesis peaks twice at GW10 and GW15-GW17. Tonotopical gradients of revert between GW8 and GW15 and follow a maturation and innervation density gradient in SGNs.
View Article and Find Full Text PDFCytopathology
December 2024
Pathology Department, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
NTRK (neurotropic tropomyosin receptor kinase)-rearranged spindle cell tumours represent a rare group of molecularly defined soft tissue neoplasms. These tumours, excluding infantile fibrosarcomas, are characterised by NTRK gene rearrangements and exhibit a range of histomorphologies, including spindle, epithelioid or rhabdoid cells with invasive growth. Their prognosis correlates with histological grade, and surgical resection is the primary treatment.
View Article and Find Full Text PDFBMC Cancer
December 2024
Institute of Integrative Medicine, Department of Integrated Traditional Chinese and Western Medicine, Xiangya Hospital, Central South University, Changsha, 410008, People's Republic of China.
Background: The NTRK fusion gene is a rare cancer driver and a typical representative "diamond mutation". Its unique role in tumor progression is highly important for the clinical diagnosis and treatment of patients with tumors. We searched for NTRK fusion-positive patients in our hospital.
View Article and Find Full Text PDFNeurol Res
December 2024
Department of Basic Sciences, Division of Biochemistry and Molecular Biology, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
Introduction: Astrocytes, specialized glial cells, are essential for maintaining the central nervous system homeostasis. Inflammatory conditions can disrupt neurotrophic factors and receptor expression in astrocytes, leading to potential central nervous system damage. Itaconate, recently identified for its anti-inflammatory properties, was investigated in this study for its effects on neurotrophic factors in LPS-stimulated primary rat astrocytes.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!
© LitMetric 2025. All rights reserved.