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1.
Bull Exp Biol Med ; 152(3): 353-6, 2012 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-22803084

RESUMO

Perfluorodecalin increased survival rate of Ehrlich ascites tumor cells under pathological conditions of hypoxia in combination with hyperkalemia. High potassium medium increased the content of lysophospholipids in samples, while in the presence of perfluorodecalin, phosphatidylethanolamine level decreased.


Assuntos
Carcinoma de Ehrlich/fisiopatologia , Sobrevivência Celular/efeitos dos fármacos , Fluorocarbonos/farmacologia , Hiperpotassemia/fisiopatologia , Hipóxia/fisiopatologia , Lisofosfolipídeos/metabolismo , Animais , Cromatografia em Camada Fina , Humanos , Fosfatidiletanolaminas/metabolismo
5.
Bull Exp Biol Med ; 147(6): 742-5, 2009 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-19902072

RESUMO

The effects of melafen (plant growth stimulant) on membrane structure and functions of animal cells were studied. The process of signal transduction from cell surface to intracellular structures and conformation changes in membranes in the presence of this substance were studied by light scatter and differential scanning microcalorimetry. Melafen in a wide range of concentrations (10(-13)-10(-3) M) inhibited Ca(2+) signal system involved in the function of Ca(2+)-dependent K(+) and Cl(-) channels in Ehrlich ascitic carcinoma cells. Being a hydrophilic substance, melafen had little effect on the lipid phase of artificial membranes, but impaired the function state of transformed cell. The importance of studies of transformed cells causes no doubt because of increasing incidence of diseases associated with uncontrolled cell division.


Assuntos
Carcinoma de Ehrlich/metabolismo , Membrana Celular/efeitos dos fármacos , Lipossomos/química , Ácidos Fosfínicos/farmacologia , Triazinas/farmacologia , Animais , Cálcio/metabolismo , Membrana Celular/metabolismo , Canais de Cloreto/efeitos dos fármacos , Dimiristoilfosfatidilcolina/química , Masculino , Membranas Artificiais , Camundongos , Estrutura Molecular , Ácidos Fosfínicos/química , Canais de Potássio/efeitos dos fármacos , Transdução de Sinais/efeitos dos fármacos , Triazinas/química , Células Tumorais Cultivadas
8.
Curr Eye Res ; 2(10): 683-9, 1982.
Artigo em Inglês | MEDLINE | ID: mdl-6985280

RESUMO

It has been shown that illumination of rod outer segment suspension in the presence of photosensitizers (methylene blue lambda greater than or equal to 620 nm; retinal 370 less than or equal to lambda less than or equal to 390 nm) results in chemical modification of the lipid and protein components of the photo-receptor membranes. This modification can be registered by accumulation of lipid peroxidation (LPO) products as well as oligomerization of rhodopsin and a decrease of rhodopsin thermal stability. These effects are prevented by 'O2-quenchers and free radical scavengers. It has been found that the electric activity (ERG) of isolated frog retina is inhibited due to photosensitized generation of 'O2 which can be overcome by preliminary addition of 'O2-quenchers and free radical scavengers to the incubation medium. The LPO products are accumulated in the retinae of rats exposed to high intensity light in vivo. It is concluded that 'O2 and LPO are involved in light-induced damage of the retina.


Assuntos
Luz/efeitos adversos , Oxigênio/farmacologia , Células Fotorreceptoras/efeitos da radiação , Pigmentos da Retina , Rodopsina , Segmento Externo da Célula Bastonete/efeitos da radiação , Animais , Radicais Livres , Técnicas In Vitro , Lipídeos/análise , Membranas/efeitos da radiação , Fotoquímica , Proteínas/análise , Rana temporaria , Ratos , Segmento Externo da Célula Bastonete/análise , Segmento Externo da Célula Bastonete/efeitos dos fármacos , Oxigênio Singlete
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