Dexamethasone increases expression and activity of multidrug resistance transporters at the rat blood-brain barrier.

Brain edema is an important factor leading to morbidity and mortality associated with primary brain tumors. Dexamethasone, a synthetic glucocorticoid, is routinely prescribed with antineoplastic agents to alleviate pain associated with chemotherapy and reduce intracranial pressure. We investigated whether dexamethasone treatment increased the expression and activity of multidrug resistance (MDR) transporters at the blood-brain barrier.

Janus kinase 3 regulates interleukin 2-induced mucosal wound repair through tyrosine phosphorylation of villin.

Janus kinase 3 (Jak3) is a non-receptor tyrosine kinase known to be expressed in hematopoietic cells. Studies of whole organ homogenates show that Jak3 is also expressed in the intestines of both human and mice. However, neither its expression nor its function has been defined in intestinal epithelial enterocytes.

Sulfasalazine-induced reduction of glutathione levels in breast cancer cells: enhancement of growth-inhibitory activity of Doxorubicin.

Background: We previously showed that the anti-inflammatory drug, sulfasalazine (salicylazosulfapyridine, SASP), can arrest proliferation of MCF-7 and MDA-MB-231 mammary cancer cells by inhibiting uptake of cystine via the x(c-) cystine/glutamate antiporter. Here we examined SASP with regard to reduction of cellular glutathione (GSH) levels and drug efficacy-enhancing ability.

Methods: GSH levels were measured spectrophotometrically.

Simultaneous measurement of in vivo P-glycoprotein and cytochrome P450 3A activities.

Digoxin and midazolam are routinely used as probe drugs to measure in vivo activity of P-glycoprotein (P-gp) and cytochrome P450 3A4/5 (CYP3A), respectively. We investigated whether digoxin and midazolam could be coadministered to simultaneously determine P-gp and CYP3A activity without a significant pharmacokinetic interaction. In a randomized crossover design, digoxin (0.

Pharmacokinetic profiling and bioequivalence assessment of two marketed brands of nevirapine tablets in healthy Indian volunteers.

Nevirapine (CAS 129618-40-2), a non-nucleoside reverse transcriptase inhibitor, has been effectively used for treatment of HIV-infected patients. A randomized, two-way, crossover study was conducted in 24 fasting, healthy, Indian male subjects to compare plasma pharmacokinetic profile and single-dose tolerability of a new nevirapine tablet formulation (test, T) with that of a reference (R) tablet. Each volunteer received T and R formulations separated by at least 19 days of drug free wash-out period.

Pharmacokinetic profiling and bioequivalence evaluation of 2 lamivudine tablet formulations after single oral administration in healthy human Indian volunteers.

The present study compared pharmacokinetic (PK) profile and single-dose tolerability of 2 marketed brands of lamivudine (3TC) 150-mg tablets, Lamivir (Cipla, Mumbai, India) and Epivir (GSK, Basingstoke, UK). The randomized, 2-treatment study was conducted in 24 fasting, healthy, Indian male subjects. Each subject received Epivir and Lamivir formulation separated by 7 days of drug-free washout period.

A combined-formulation tablet of lamivudine/nevirapine/stavudine: bioequivalence compared with concurrent administration of lamivudine, nevirapine, and stavudine in healthy Indian subjects.

Generic fixed-dose combinations of antiretrovirals are frequently prescribed for the treatment of human immunodeficiency virus infection. A randomized, 2-way study was conducted in 24 fasting, healthy, Indian male subjects to assess bioequivalence between a single combination tablet containing lamivudine, stavudine, and nevirapine (treatment A) with respect to separate marketed tablets administered simultaneously (treatment B). Each subject received treatments A and B separated by 19 days of a drug-free washout period.

Bioequivalence evaluation of two marketed brands of stavudine 40 mg capsules in healthy human South African volunteers.

Stavudine (d4T), a thymidine nucleoside analogue has been effectively used for treatment of patients infected with HIV. A randomized, two-way, crossover study was conducted in 24 fasting, healthy, Caucasian male volunteers to compare plasma pharmacokinetic (PK) profile and single-dose tolerability of a new d4T formulation (Stavir, Cipla Ltd, India; 40 mg capsule, test, T) with that of reference (R) formulation (Zerit), Bristol-Myers Squib, NJ, USA; capsule, 40 mg). Each volunteer received T and R formulation separated by at least 10 days of drug free wash-out period.

Suppression of cystine uptake by sulfasalazine inhibits proliferation of human mammary carcinoma cells.

Background: Malignant progression of lymphoma cells is associated with acquisition of the cystine/glutamate antiporter, xc-, enhancing cystine uptake. Recently, we showed that sulfasalazine (SASP) is a specific xc- inhibitor. Here, we investigated xc- in mammary cancer cell lines.