Multiparametric imaging reveals that mitochondria-rich intercalated cells in the kidney collecting duct have a very high glycolytic capacity
| Autor: | Robert J. Unwin, Joana Raquel Martins, Soline Bourgeois, Dominik Haenni, Susan Ghazi, César Nombela-Arrieta, Carsten A. Wagner, Alvaro Gomariz, Andrew M. Hall, Milica Bugarski, Eilidh Craigie |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Male Mitochondrion Biochemistry 03 medical and health sciences Mice 0302 clinical medicine Live cell imaging Genetics medicine Animals Homeostasis Intercalated Cell Glycolysis Kidney Tubules Collecting Molecular Biology Adenosine Triphosphatases Epididymis Kidney ATP synthase biology Chemistry Epithelial Cells Metabolism Hydrogen-Ion Concentration Proton Pumps Cell biology Mitochondria Mice Inbred C57BL Proton-Translocating ATPases 030104 developmental biology medicine.anatomical_structure biology.protein Calcium NAD+ kinase 030217 neurology & neurosurgery Biotechnology |
| Zdroj: | FASEB journal : official publication of the Federation of American Societies for Experimental BiologyREFERENCES. 34(6) |
| ISSN: | 1530-6860 |
| Popis: | Alpha intercalated cells (αICs) in the kidney collecting duct (CD) belong to a family of mitochondria rich cells (MRCs) and have a crucial role in acidifying the urine via apical V-ATPase pumps. The nature of metabolism in αICs and its relationship to transport was not well-understood. Here, using multiphoton live cell imaging in mouse kidney tissue, FIB-SEM, and other complementary techniques, we provide new insights into mitochondrial structure and function in αICs. We show that αIC mitochondria have a rounded structure and are not located in close proximity to V-ATPase containing vesicles. They display a bright NAD(P)H fluorescence signal and low uptake of voltage-dependent dyes, but are energized by a pH gradient. However, expression of complex V (ATP synthase) is relatively low in αICs, even when stimulated by metabolic acidosis. In contrast, anaerobic glycolytic capacity is surprisingly high, and sufficient to maintain intracellular calcium homeostasis in the presence of complete aerobic inhibition. Moreover, glycolysis is essential for V-ATPase-mediated proton pumping. Key findings were replicated in narrow/clear cells in the epididymis, also part of the MRC family. In summary, using a range of cutting-edge techniques to investigate αIC metabolism in situ, we have discovered that these mitochondria dense cells have a high glycolytic capacity. |
| Databáze: | OpenAIRE |
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