Selective Regulation of 5-HT1B Serotonin Receptor Expression in the Striatum by Dopamine Depletion and Repeated L-DOPA Treatment: Relationship to L-DOPA-Induced Dyskinesias.

Dopamine and serotonin in the basal ganglia interact in a bidirectional manner. On the one hand, serotonin (5-HT) receptors regulate the effects of dopamine agonists on several levels, ranging from molecular signaling to behavior. These interactions include 5-HT receptor-mediated facilitation of dopamine receptor-induced gene regulation in striatal output pathways, which involves the 5-HT1B receptor and others.

Pharmacodynamic Effects of Sulbactam/Meropenem/Polymyxin-B Combination Against Extremely Drug Resistant Using Checkerboard Information.

The aims of the study are to evaluate the activity of sulbactam, meropenem, and polymyxin B alone and in combination against six isolates of extremely drug resistant and to determine dosing regimens that achieve a sufficient joint probability of target attainment (PTA) based on combination antimicrobial pharmacodynamics. The combinations were evaluated by the checkerboard method and were considered synergistic when the fractional inhibitory concentration index (FICI) ≤0.5.

Determination of Dermal Pharmacokinetics by Microdialysis Sampling in Rats.

The evaluation of absorption and availability at the site of action of a drug candidate is an important element of drug discovery and development, as clinical response is a function of the bioavailability of the active agent and its continued presence at the site of action. Evaluation of dermal pharmacokinetics facilitates the selection of new compounds or chemical structures for advancement as possible clinical candidates. An advantage of microdialysis is that it allows the measurement of compound concentrations at the site of action without disturbing the tissue milieu, making it possible to determine the relationship between this important variable and plasma concentrations of the agent.

Dermal pharmacokinetics of pyrazinamide determined by microdialysis sampling in rats.

Studies have demonstrated the efficacy of pyrazinamide (PZA) against stages of the Leishmania parasite that causes cutaneous leishmaniasis. Although PZA is widely distributed in most body fluids and tissues, the amount of drug reaching the skin is unknown. This study aimed to investigate the pharmacokinetics of PZA in rat dermal tissue by dermal microdialysis.