Mark A Cervinski

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Dopamine transporters (DATs) undergo intracellular sequestration and functional down-regulation upon exposure to psychostimulant substrates. To investigate the potential mechanism underlying these responses, we examined the acute in vitro and in vivo effects of amphetamine and methamphetamine (METH) on phosphorylation and down-regulation of rat DAT using(More)
Dopamine transporters (DATs) undergo increased phosphorylation upon treatment of striatal tissue or cultured cells with protein kinase C activators and protein phosphatase inhibitors. Phosphorylation conditions also lead to reductions in dopamine transport activity, which may function to regulate synaptic dopamine levels and control the extent and duration(More)
BACKGROUND During pregnancy, human chorionic gonadotropin (hCG) immunoreactivity in urine consists of intact hCG as well as a number of hCG variants including the core fragment of hCGbeta (hCGbeta cf). We identified 3 urine specimens with apparent false-negative results using the OSOM(R) hCG Combo Test (Genzyme Diagnostics) qualitative hCG device and sought(More)
BACKGROUND Qualitative point-of-care (POC) tests for human chorionic gonadotropin (hCG) vary in their ability to detect purified hCG variants and there is data to suggest that over-the-counter (OTC) devices might also display similar variability. This could potentially influence the detection of urine hCG in early pregnancy. METHODS Six OTC devices were(More)
The dopamine transporter (DAT) is a neuronal phosphoprotein and target for psychoactive drugs that plays a critical role in terminating dopaminergic transmission by reuptake of dopamine from the synaptic space. Control of DAT activity and plasma membrane expression are therefore central to drug actions and the spatial and temporal regulation of synaptic(More)
Conversion of clopidogrel (Plavix) to its active metabolite is catalyzed largely by the P450 enzyme 2C19 (CYP2C19). Numerous allelic variants of CYP2C19 exist. The *1 allele is considered wild type, whereas the *2 and *3 alleles have no in vivo enzymatic activity. Conversely, the *17 allele has increased expression, resulting in increased clopidogrel(More)
We investigated the functional relationship between the soluble N-ethylmaleimide-sensitive factor attachment receptor (SNARE) protein syntaxin 1A (syn 1A) and the dopamine transporter (DAT) by treating rat striatal tissue with Botulinum Neurotoxin C (BoNT/C) and co-transfecting syn 1A with DAT in non-neuronal cells, followed by analysis of DAT activity,(More)
Lipoprotein X (Lp-X) is an abnormal lipoprotein which may form in patients with intra- and extra-hepatic cholestasis. The presence of very high levels of Lp-X has been shown to be a rare cause of pseudohyponatremia. We present a patient with severe obstructive cholestasis secondary to pancreatic cancer leading to very high Lp-X concentrations resulting in(More)
Point-of-care (POC) testing for the detection of pregnancy and the prediction of ovulation has grown and evolved since the introduction of the first qualitative pregnancy test marketed directly to the consumer over three decades ago. Numerous publications have analyzed both pregnancy and ovulation prediction devices for their sensitivity, accuracy and(More)