Mitochondrial bound hexokinase type I in normal and streptozotocin diabetic rat retina. 2020

Gabriela Ramírez-Pérez, and Gustavo Sánchez-Chávez, and Rocío Salceda
División de Neurociencias, Departamento de Neurodesarrollo y Fisiología, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, México, D.F. 04510, Ciudad de México, Mexico.

Diabetic retinopathy is thought to be trigger by glucose- induced oxidative stress which leads to an increase of the mitochondrial permeability through opening the permeability transition pore (MTP). In several cell types, hexokinases interact with the mitochondria regulating MTP opening, avoiding cytochrome c release. We studied HK I mitochondrial proportion in control and streptozotocin-induced diabetic rat retinas. In the normal retina, 50% of HK I was linked to mitochondria, proportion that did not change up to 60 days of diabetes. Mitochondria from normal and diabetic rat retinas showed a limited swelling, and similar cytochrome c levels. G-6-P and glycogen content increased 3-6-fold in diabetic rat retinas, while lactate content did not vary. Results suggest that mitochondrial bound HK produce G-6-P and drove it to glycogen synthesis, controlling ROS production and lactate toxicity.

UI MeSH Term Description Entries
D008928 Mitochondria Semiautonomous, self-reproducing organelles that occur in the cytoplasm of all cells of most, but not all, eukaryotes. Each mitochondrion is surrounded by a double limiting membrane. The inner membrane is highly invaginated, and its projections are called cristae. Mitochondria are the sites of the reactions of oxidative phosphorylation, which result in the formation of ATP. They contain distinctive RIBOSOMES, transfer RNAs (RNA, TRANSFER); AMINO ACYL T RNA SYNTHETASES; and elongation and termination factors. Mitochondria depend upon genes within the nucleus of the cells in which they reside for many essential messenger RNAs (RNA, MESSENGER). Mitochondria are believed to have arisen from aerobic bacteria that established a symbiotic relationship with primitive protoeukaryotes. (King & Stansfield, A Dictionary of Genetics, 4th ed) Mitochondrial Contraction,Mitochondrion,Contraction, Mitochondrial,Contractions, Mitochondrial,Mitochondrial Contractions
D012160 Retina The ten-layered nervous tissue membrane of the eye. It is continuous with the OPTIC NERVE and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the CHOROID and the inner surface with the VITREOUS BODY. The outer-most layer is pigmented, whereas the inner nine layers are transparent. Ora Serrata
D003920 Diabetes Mellitus A heterogeneous group of disorders characterized by HYPERGLYCEMIA and GLUCOSE INTOLERANCE.
D003930 Diabetic Retinopathy Disease of the RETINA as a complication of DIABETES MELLITUS. It is characterized by the progressive microvascular complications, such as ANEURYSM, interretinal EDEMA, and intraocular PATHOLOGIC NEOVASCULARIZATION. Diabetic Retinopathies,Retinopathies, Diabetic,Retinopathy, Diabetic
D004195 Disease Models, Animal Naturally-occurring or experimentally-induced animal diseases with pathological processes analogous to human diseases. Animal Disease Model,Animal Disease Models,Disease Model, Animal
D005260 Female Females
D006593 Hexokinase An enzyme that catalyzes the conversion of ATP and a D-hexose to ADP and a D-hexose 6-phosphate. D-Glucose, D-mannose, D-fructose, sorbitol, and D-glucosamine can act as acceptors; ITP and dATP can act as donors. The liver isoenzyme has sometimes been called glucokinase. (From Enzyme Nomenclature, 1992) EC 2.7.1.1. Hexokinase A,Hexokinase D,Hexokinase II
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013311 Streptozocin An antibiotic that is produced by Stretomyces achromogenes. It is used as an antineoplastic agent and to induce diabetes in experimental animals. Streptozotocin,2-Deoxy-2-((methylnitrosoamino)carbonyl)amino-D-glucose,Streptozotocine,Zanosar
D045304 Cytochromes c Cytochromes of the c type that are found in eukaryotic MITOCHONDRIA. They serve as redox intermediates that accept electrons from MITOCHONDRIAL ELECTRON TRANSPORT COMPLEX III and transfer them to MITOCHONDRIAL ELECTRON TRANSPORT COMPLEX IV. Cytochrome c,Ferricytochrome c,Ferrocytochrome c,Apocytochrome C

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