Wasserstrom, J. Andrew, and Ana-Maria Vites. Activation of contraction in cat ventricular myocytes: effects of low Cd21 concentration and temperature. Am. J. Physiol. 277 (Heart Circ. Physiol. 46): H488–H498, 1999.—The effects of Cd21 (20 μM) and different bath temperatures were used to study the contributions of two separate triggering mechanisms, L-type Ca21 current (ICa) and reverse mode Na1...

Embryonic amphibian neurons grown in dissociated cell culture extend neurites and can produce action potentials. The ionic dependence of the inward current of the action potential gradually changes from primarily calcium to primarily sodium. Early exposure of these neurons to protein synthesis inhibitors (cycloheximide, puromycin) blocked the appearance of neurites; later exposure blocked the n...

Nicotine-induced ATP secretion from chromaffin cells was blocked by imipramine and desipramine. This blocking action took place on both, fast and slow, components of ATP secretion. Exposure of chromaffin cells to nicotine (10 microM) for 4 s induced an inward current of about -155 pA. Imipramine and desipramine blocked, in a concentration-dependent manner, both peak inward current and total cha...

The traditional herb Plumula Nelumbinis is widely used in the world because it has many biological activities, such as anti-inflammation, antioxidant, antihypertension, and butyrylcholinesterase inhibition. However, the action of Plumula Nelumbinis on airway smooth muscle (ASM) relaxation has not been investigated. A chloroform extract of Plumula Nelumbinis (CEPN) was prepared, which completely...

Annona senegalensis Pers. is a plant used in Burkina folkloric medicine for the treatment of epilepsy. The stem-bark, roots and leaves A. are an array human disorders, including Previous studies have demonstrated some genuine effects fractions vivo models temporal lobe In present work, we compared pharmacological profile most promising fraction obtained up-to-date with anticonvulsant drugs targ...

1. Voltage-gated K currents were studied in relay neurons (RNs) acutely isolated from somatosensory (VB) thalamus of 7- to 14-day-old rats. In addition to a rapidly activated, transient outward current, IA, depolarizations activated slower K+ currents, which were isolated through the use of appropriate ionic and pharmacological conditions and measured via whole-cell voltage-clamp. 2. At least t...

We have investigated the actions of vasoactive intestinal peptide (VIP) and neuropeptide Y (NPY) on the pacemaker current (I(f)) in canine Purkinje fibers. On voltage pulses to the middle of the I(f) activation range, VIP reversibly increases I(f), whereas NPY reversibly decreases I(f). A three-pulse voltage protocol suggests that VIP shifts I(f) activation in the positive direction and that NP...