scholarly journals MiR-592 activates the mTOR kinase, ERK1/ERK2 kinase signaling and imparts neuronal differentiation signature characteristic of Group 4 medulloblastoma

2021 ◽  
Author(s):  
Raikamal Paul ◽  
Purna Bapat ◽  
Akash Deogharkar ◽  
Sadaf Kazi ◽  
Satish Kumar Vishram Singh ◽  
...  
Cytokine ◽  
2013 ◽  
Vol 61 (1) ◽  
pp. 329-335 ◽  
Author(s):  
Renaud Geslain ◽  
Shahab Uddin ◽  
Hui Liu ◽  
Hongmei Jiang ◽  
Koen van Besien ◽  
...  

Author(s):  
С.Г. Морозов ◽  
А.Е. Копасов

Цель работы - измерение уровня белков, ассоциированных с сигнальными путями киназы mTOR (mTOR, Raptor, Rictor, 4Е-ВР1 p70-S6K1, AKT) в клетках кожи выделенных при операции абдоминопластики у пациентов с нормальной массой тела и ожирением. Основное значение исследования - установление участия сигнальных путей киназы mTOR в патогенетических процессах при ожирении и их роли в развитии послеоперационных осложнений при операции абдоминопластики. Методика. Клетки кожи выделяли из операционного материала ферментативной обработкой, затем восстанавливали в полной среде, после чего проводили иммунотипирование маркеров рецепторов и внутриклеточных белков моноклональнми антителами меченными флуоресцентными красителями Интенсивность флуоресценции анализировали на проточном цитометре. Результаты. Проведено сравнение уровня белков, связанных с сигнальными путями киназы mTOR, в выделенных после абдоминопластики клетках кожи при ожирении и нормальной массе тела. Было установлено повышение уровня белков, ассоциированных с киназой mTOR, в клетках кожи пациенток с ожирением. Показано при ожирении преимущественное участие первого комплекса mTORC1 в активации клеток. Установлено повышение активности вторичных мессенджеров киназы mTOR - фактора 4E-BP1 и рибосомальной киназы p70-S6K1, передающих сигналы на рибосомы для синтеза белка в фибробластах и кератиноцитах кожи пациентов с ожирением после абдоминопластики. Заключение. Полученные данные отражают патогенетические особенности ожирения, что может иметь значение в развитии послеоперационных осложнений, наблюдаемых у пациенток с ожирением после абдоминопластики. Aim. To measure expression of kinase mTOR-associated proteins (mTOR, Raptor, Rictor, 4E-BP1 p70-S6K1, AKT) in skin cells isolated from patients with normal body weight and obesity after abdominoplasty. The importance of this study was in determining the role of mTOR kinase signaling pathways in the pathogenesis of obesity and obesity-associated complications after abdominal surgery. Methods. Skin cells were isolated from surgical material by enzymic treatment, restored in a complete medium, and then stained with monoclonal antibodies to receptors and intracellular proteins. The fluorescence intensity was analyzed with a flow cytometer. Results. Expression of proteins associated with mTOR kinase signaling pathways was compared in isolated skin cells from patients with obesity and normal body weight. Increased mTOR protein expression was found to be associated with obesity. The first mTORC1 complex primarily contributed to the activation of skin cells from obese patients after abdominoplasty. Activities of mTOR second messengers, 4E-BP1 kinase and ribosomal kinase p70-S6K1, which transmit signals to ribosomes for protein synthesis, were elevated in skin fibroblasts and keratinocytes of patients with obesity after abdominoplasty. Conclusion. Results of this study delineated features of the pathogenesis of obesity that may be related with postoperative complications of abdominoplasty typical for obese patients.


Autophagy ◽  
2006 ◽  
Vol 2 (4) ◽  
pp. 264-271 ◽  
Author(s):  
Isei Tanida ◽  
Mika Wakabayashi ◽  
Takashi Kanematsu ◽  
Naoko Minematsu-Ikeguchi ◽  
Yu-shin Sou ◽  
...  

2020 ◽  
Vol 22 (Supplement_3) ◽  
pp. iii399-iii400
Author(s):  
Manabu Natsumeda ◽  
Hiroaki Miyahara ◽  
Junichi Yoshimura ◽  
Yoshihiro Tsukamoto ◽  
Makoto Oishi ◽  
...  

Abstract BACKGROUND We have previously investigated the expression of Gli3, a downstream target of the Sonic Hedgehog pathway, which main function is to suppress Gli1/2 in medulloblastomas. We found that Gli3 is associated with neuronal and glial differentiation in desmoplastic / nodular (D/N) type medulloblastomas (Miyahara et al., Neuropathology, 2013). In the present study, we investigated the expression of Gli3 in molecular subgroups. METHOD Thirty-one medulloblastomas treated at Niigata University between 1982 and 2013 were studied. Molecular classification into 4 subgroups (WNT-activated, SHH-activated, Group 3 and Group 4) using Nanostring and immunohistochemistry was performed. Furthermore, Gli3 and Gli1 expression in molecular subgroups was assessed using public data bases. RESULTS Nanostring was considered reliable (confidence > 0.9) in 28 cases. Four cases were classified as WNT-, 5 cases as SHH-activated, 4 cases as Group 3 and 16 cases as Group 4. Gli3 was positive in 7 out of 9 (78%) WNT-/SHH- cases, but positive in only 8 out of 19 (42.1%) non-WNT-/SHH- subgroup cases (p = 0.1145, Fisher’s exact test). R2 database analysis confirmed that Gli3 was significantly elevated in WNT- and SHH-activated medulloblastoma. Gli1 was elevated in SHH-activated cases but suppressed in WNT-activated cases. IHC analysis revealed that Gli3 was elevated inside nodules showing neuronal differentiation in D/N type medulloblastoma. Results of single cell RNA analyses were consistent with those of IHC, Nanostring and R2. CONCLUSION These results suggest that Gli3 is elevated inside the nodules of SHH-activated medulloblastoma, whereas in WNT-activated cases, Gli3 diffusely suppresses HH signaling.


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