scholarly journals THE ASSAY OF ANIMAL TISSUES FOR RESPIRATORY ENZYMES

1948 ◽  
Vol 175 (2) ◽  
pp. 619-634 ◽  
Author(s):  
Van R. Potter ◽  
G.A. LePage ◽  
H.L. Klug
1943 ◽  
Vol 150 (1) ◽  
pp. 185-195 ◽  
Author(s):  
K.P. DuBois ◽  
V.R. Potter

1948 ◽  
Vol 176 (3) ◽  
pp. 1075-1084 ◽  
Author(s):  
Van R. Potter ◽  
Arthur B. Pardee ◽  
Gloria G. Lyle

1943 ◽  
Vol 149 (1) ◽  
pp. 217-227 ◽  
Author(s):  
W.C. Schneider ◽  
V.R. Potter

Author(s):  
Ю.И. Кирова ◽  
Э.Л. Германова

Митохондриогенез и ангиогенез являются ключевыми нейропротекторными механизмами, повышающими устойчивость нервной ткани к условиям гипоксии/ишемии. В настоящее время фармакологическая индукция биогенеза митохондрий является одним из наиболее перспективных и активно разрабатываемых подходов к коррекции ишемических и постишемических нарушений, нейродегенеративных заболеваний и кардиопатий. Выявление факта стимуляции митохондриогенеза эталонными нейропротекторными препаратами позволит существенно расширить представление об их терапевтическом потенциале и принципах применения. Цель исследования - изучение влияния нейропротекторного сукцинатсодержащего препарата мексидол на экспрессию каталитических субъединиц дыхательных ферментов митохондрий, АТФ-синтазы и фактора роста эндотелия сосудов в коре головного мозга крыс с врожденными различиями в устойчивости к дефициту кислорода. Методика. Исследование выполнено на белых беспородных крысах-самцах. Инъекции мексидола (40 мг/кг, внутрибрюшинно) выполняли ежедневно на протяжении 20 сут. Уровень экспрессии каталитических субъединиц дыхательных ферментов митохондрий и АТФ-синтазы, фактора роста эндотелия сосудов и сукцинатного рецептора в ткани коры головного мозга оценивали методом иммуноблоттинга. Общую резистентность организма к острой гипоксии тестировали в гипобарической камере проточного типа при разрежении атмосферы, соответствующем 190 мм рт. ст. (3% О). Результаты. В ходе курса применения мексидола происходило увеличение уровня каталитических субъединиц дыхательных ферментов митохондрий (NDUFV2, SDHA, cyt b, COX1), АТФ-синтазы (ATP5A), фактора роста эндотелия сосудов (VEGF) и сукцинатного рецептора (SUCNR1), особенно выраженное у неустойчивых к гипоксии особей. Заключение. Впервые показана вовлеченность сукцинатсодержащего препарата мексидол в механизмы индукции ферментов энергопродуцирующей системы митохондрий коры головного мозга, что существенно расширяет сложившиеся представления о механизмах его энерготропного действия. Mitochondriogenesis and angiogenesis are crucial neuroprotective mechanisms that increase the resistance of nervous tissue to hypoxia/ischemia conditions. Currently, pharmacological induction of mitochondrial biogenesis is one of the most promising and actively developed approaches for the correction of ischemic and post-ischemic disorders, neurodegenerative diseases and cardiopathies. Revealing the fact of stimulation of mitochondriogenesis with standard neuroprotective drugs will significantly expand the understanding of their therapeutic potential and principles of application. The aim of the research was to study the effect of the neuroprotective succinate-containing drug mexidol on the expression of catalytic subunits of the respiratory enzymes of mitochondria, ATP-synthase and vascular endothelial growth factor in the cerebral cortex of rats with inborn differences in resistance to oxygen deficiency. Methods. The study was carried out on white mongrel rats-males injections of mexidol (40 mg/kg, intraperitoneally) were performed daily for 20 days. The expression level of the catalytic subunits of the respiratory enzymes of mitochondria and ATP-synthase, vascular endothelial growth factor and succinate receptor in the tissue of the cerebral cortex was assessed by immunoblotting. The total resistance of the organism to acute hypoxia was tested in a hypobaric chamber with an atmosphere underpressure corresponding to 190 mm Hg (3% O). Results. During the injection course of mexidol, there was an increase in the level of catalytic subunits of the respiratory enzymes of mitochondria (NDUFV2, SDHA, cyt b, COX1), ATP-synthase (ATP5A), vascular endothelial growth factor (VEGF) and succinate receptor (SUCNR1), especially pronounced in rats with low-resistance to hypoxia. Conclusion. The study revealed for the first time the involvement of the succinate-containing drug mexidol in the mechanisms of induction of enzymes of the energy-producing system of the mitochondria of the cerebral cortex, which significantly expands the existing ideas about the mechanisms of its energy-tropic action.


Author(s):  
Lili Pan ◽  
Yu Ma ◽  
Xiaoai Wu ◽  
Huawei Cai ◽  
Feng Qin ◽  
...  

Abstract:: As a group of heterocyclic macrocycle organic natural compounds occurring universally in animal tissues and plants, porphyrins are composed of four modified pyrrole subunits. Porphyrin analogues/derivatives possess multiple biochemical properties because of their unique structures and have been extensively investigated in cancer treatment. Studies have shown that porphyrins and their derivatives have the ability to locate in tumor cells in a variety of human cancers, and these compounds not only exhibit potent therapeutic effects as photodynamic agents but also show promising properties in medicinal imaging, such as MRI, photoacoustic imaging, fluorescence imaging and PET/SPECT imaging. This paper reviews the recent reports of porphyrin derivatives as therapeutic agents used in tumor therapies, such as sonodynamic therapy, photodynamic therapy and radiotherapy, as well as imaging agents for multimodality tumor imaging. The limitations of porphyrin-based compounds in tumor treatments and future prospects are also summarized.


2011 ◽  
Vol 89 (6) ◽  
pp. 453-465 ◽  
Author(s):  
Daryl Codron ◽  
Jacqui Codron ◽  
Matt Sponheimer ◽  
Stefano M. Bernasconi ◽  
Marcus Clauss

The stable carbon isotope composition of animal tissues represents the weighted sum of the variety of food sources eaten. If sources differ in digestibility, tissues may overrepresent intake of more digestible items and faeces may overrepresent less digestible items. We tested this idea using whole blood and faeces of goats ( Capra hircus L., 1758) fed different food mixtures of C3 lucerne ( Medicago sativa L.) and C4 grass ( Themeda triandra Forssk.). Although blood and faecal δ13C values were broadly consistent with diet, results indicate mismatch between consumer and diet isotope compositions: both materials overrepresented the C3 (lucerne) component of diets. Lucerne had lower fibre digestibility than T. triandra, which explains the results for faeces, whereas underrepresentation of dietary C4 in blood is consistent with low protein content of the grass hay. A diet switch experiment revealed an important difference in 13C-incorporation rates across diets, which were slower for grass than lucerne diets, and in fact equilibrium states were not reached for all diets. Although more research is needed to link digestive kinetics with isotope incorporation, these results provide evidence for nonlinear relationships between consumers and their diets, invoking concerns about the conceptual value of “discrimination factors” as the prime currency for contemporary isotope ecology.


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