Pavel Ostašov

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HEK293 cells stably expressing δ-opioid receptor were labeled first with fluorescent analog of cholesterol, 22-NBD-cholesterol, exposed to cholesterol-depleting agent β-cyclodextrin (β-CDX) and analyzed by fluorescence lifetime imaging microscopy (FLIM). In accordance with chemical analysis of cholesterol level, the total cellular signal of this probe was(More)
We monitored the radioligand-binding characteristics of thyrotropin-releasing hormone (TRH) receptors, functional activity of G(q/11)alpha proteins, and functional status of the whole signaling cascade in HEK293 expressing high levels of TRH receptors and G(11)alpha. Our analyses indicated that disruption of plasma membrane microdomains by cholesterol(More)
Biophysical studies of fluorescence anisotropy of DPH and Laurdan generalized polarization were performed in plasma membranes (PM) isolated from control and cholesterol-depleted HEK293 cells stably expressing pertussis toxin (PTX)-insensitive DOR-Gi1α (Cys351-Ile351) fusion protein. PM isolated from control, PTX-untreated, cells were compared with PM(More)
UNLABELLED Here we investigated the effect of disruption of plasma membrane integrity by cholesterol depletion on thyrotropin-releasing hormone receptor (TRH-R) surface mobility in HEK293 cells stably expressing TRH-R-eGFP fusion protein (VTGP cells). Detailed analysis by fluorescence recovery after photobleaching (FRAP) in bleached spots of different sizes(More)
Testate amoebae (TA) are a group of free-living protozoa, important in ecology and paleoecology. Testate amoebae taxonomy is mainly based on the morphological features of the shell, as examined by means of light microscopy or (environmental) scanning electron microscopy (SEM/ESEM). We explored the potential applications of confocal laser scanning microscopy(More)
The molecular mechanisms involved in GPCR-initiated signaling cascades where the two receptors share the same signaling cascade, such as thyrotropin-releasing hormone (TRH) and angiotensin II (ANG II), are still far from being understood. Here, we analyzed hormone-induced Ca(2+) responses and the process of desensitization in HEK-293 cells, which express(More)
Large number of extracellular signals is received by plasma membrane receptors which, upon activation, transduce information into the target cell interior via trimeric G-proteins (GPCRs) and induce activation or inhibition of adenylyl cyclase enzyme activity (AC). Receptors for opioid drugs such as morphine (micro-OR, delta-OR and kappa-OR) belong to(More)
Agonist-induced subcellular redistribution of G-protein coupled receptors (GPCR) and of trimeric guanine-nucleotide binding regulatory proteins (G-proteins) represent mechanisms of desensitization of hormone response, which have been studied in our laboratory since 1989. This review brings a short summary of these results and also presents information about(More)
Hereditary cerebellar ataxias are a wide group of progressive, degenerative diseases, which manifest as lack of control and coordination of voluntary movements due to progressive loss of Purkinje cells and other cell types in the cerebellum. Cerebellar degeneration could affect people of any age, is often diagnosed after symptoms start to manifest and no(More)
Leukemia inhibitory factor (LIF) is a multi-function cytokine that has various effects on different tissues and cell types in rodents and humans; however, its insufficiency has a relatively mild impact. This could explain why only some aspects of LIF activity are in the time-light, whereas other aspects are not well known. In this review, the LIF structure,(More)
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