Melanophore-stimulating hormone (MSH) has been shown to be associated with food intake in addition to body color change in teleosts. MSH is encoded by a proopiomelanocortin (POMC) gene together with endorphin (END). To assess the significance of MSH to biological activities, we determined the structure and evaluated the expression of POMC mRNA in barfin flounder (bf), Verasper moseri, a member of a group of teleosts, Pleuronectiformes. Three subtypes of POMC cDNAs (A, B, and C) were amplified from bf pituitary glands. These bfPOMCs contained segments for N-POMC, alpha-MSH, beta-MSH, and beta-END as do other teleost POMCs, while POMC-C showed remarkable variations in the segments corresponding to N-POMC and beta-END. A phylogenetic tree of ray-finned fish POMCs constructed by the neighbor joining method revealed that the three POMC subtypes may have appeared as a result of duplication events occurring at least twice during the course of bf evolution. The first duplication may have generated the lineage leading to an ancestor of bfPOMC-A and -B and that leading to bfPOMC-C, and then the lineage of bfPOMC-A may have diverged from that of bfPOMC-B. All peptides flanked by processing signals excluding N-POMC-C (1-14) were identified in a single pituitary extract by mass spectrometry, and the cDNAs of three POMCs were amplified from a single pituitary by reverse transcription polymerase chain reaction. These results demonstrated that the three POMC genes are expressed in a single individual. While the bfPOMC-A gene was exclusively expressed in the pituitary, the bfPOMC-B and -C genes were expressed in non-pituitary tissues such as brain, gill, heart, spleen, liver, stomach, intestine, testis, muscle, blood, and skin in addition to the pituitary. The expression levels of the POMC-A, -B, and -C genes in pituitary neurointermediate lobe were greater in the fish reared with a black background than the fish reared with a white background, indicating that MSH derived from all of the three bfPOMC genes was associated with body color change. No difference was observed in the expression levels of bfPOMC-C in the brain in response to feeding status.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1016/j.ygcen.2005.01.010 | DOI Listing |
J Pathol Clin Res
January 2025
Department of Urology, University of Duisburg-Essen, Essen, Germany.
Distinct molecular subtypes of muscle-invasive bladder cancer (MIBC) may show different platinum sensitivities. Currently available data were mostly generated at transcriptome level and have limited comparability to each other. We aimed to determine the platinum sensitivity of molecular subtypes by using the protein expression-based Lund Taxonomy.
View Article and Find Full Text PDFCureus
January 2025
Dermatology and Dermatologic Surgery, Prince Sultan Military Medical City, Riyadh, SAU.
Tumid lupus erythematosus (TLE) is a rare subtype of cutaneous lupus, which can present diagnostic challenges due to its overlapping features with other skin disorders. Understanding the clinical and histopathological characteristics of TLE is essential for accurate diagnosis and management. In this article, we describe a case of TLE in a 45-year-old man who presented with annular, urticarial, non-scarring plaques on the scalp associated with non-scarring alopecia in the affected area.
View Article and Find Full Text PDFWorld J Gastrointest Oncol
January 2025
Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.
Background: Gallbladder cancer (GBC) is the most common and aggressive subtype of biliary tract cancer (BTC) and has a poor prognosis. A newly developed regimen of gemcitabine, cisplatin, and durvalumab shows promise for the treatment of advanced BTC. However, the efficacy of this treatment for GBC remains unclear.
View Article and Find Full Text PDFTransl Cancer Res
December 2024
BGI Research, Chongqing, China.
Background: Medulloblastoma (MB) is a highly malignant childhood brain tumor. Previous research on the genetic underpinnings of MB subtypes has predominantly focused on European and American cohorts. Given the notable genetic differences between Asian and other populations, a subtype-specific study on an Asian cohort is essential to provide comprehensive insights into MB within this demographic.
View Article and Find Full Text PDFSisli Etfal Hastan Tip Bul
December 2024
Department of Radiology, Harran University Faculty of Medicine, Sanliurfa, Türkiye.
Objectives: To assess the efficacy of endovascular treatment and clinical outcomes in individuals with symptomatic intracranial stenosis who had not responded adequately to medical intervention.
Methods: The study included 32 patients who received endovascular treatment due to high-grade (70%-99% severity) intracranial atherosclerotic stenosis from December 2021 to December 2023. The patients had not experienced any acute ischemic or hemorrhagic infarction within the last three weeks, had a Modified Rankin Scale score of ≤3 at baseline, and developed a transient ischemic attack or non-disabling stroke despite having received the best medical treatment.
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!