The mechanism by which dihydropyridines (DHPs) modulate the electrically evoked or KCI-induced release of substance P (SP) from embryonic chick dorsal root ganglion (DRG) neurons was investigated in the present study. The release of SP, as measured by radioimmunoassay (RIA), was characterized in terms of its dependence on extracellular calcium ion, its stimulus-response relationship, its sensit...

The mechanism of cellular uptake of cadmium, a highly toxic metal ion, is not known. We have studied cadmium uptake and toxicity in an established secretory cell line, GH4C1, which has well characterized calcium channels. Nimodipine, an antagonist of voltage-sensitive calcium channels, protected cells against cadmium toxicity by increasing the LD50 for CdCl2 from 15 to 45 microM, whereas the ca...

Wound healing is a natural response to restore the injured tissue to normal. Wound healing is also complicated process involving different cellular, molecular and biochemical mechanisms and various types of cytokines and growth factors. Calcium channel blockers belong to cardiovascular medicine and administrated to treatment of hypertension, angina and cardiac arrhythmia because of vasodilatory...

BACKGROUND/AIMS Arachidonic acid (AA) and its metabolites are important endogenous lipid messengers. In this study, we test the effect of Leukotriene B4 (LTB4), a 5-lipoxygenase metabolite of AA, on L-type calcium channels in A7r5 rat aortic vascular smooth muscle cells. METHODS L-type calcium channel currents were recorded by a patch-clamp technique. The mRNA expression of CaV1.2 was determi...

Introduction: TRPV1 is a non-selective cation channel with high permeability to calcium ions, and is also involved in the development of neurogenic and inflammatory pain. The increase in intracellular calcium plays a role in worsening of stroke. In the present study we investigated the effect of (AMG9810) TRPV1 receptor antagonist on stroke outcome in the permanent middle cerebral artery occlus...

conclusions ip injection of cb1 receptor antagonist might have an anxiogenic profile in rat, whereas calcium channel blocker attenuated the anxiogenic effect of am251. our results suggest that there is an interaction between functions of l-type ca2+ channels and cannabinoid system in anxiety. background the elevated plus-maze (epm) has been broadly used to investigate anxiolytic and anxiogenic ...

1. The effects of chronic treatment with the dihydropyridine, Bay K 8644, were studied on the ethanol withdrawal syndrome, in vivo and in vitro. 2. Addition of racemic Bay K 8644 to the drinking mixture, throughout the chronic ethanol treatment, decreased the behavioural excitability seen during ethanol withdrawal in vivo. 3. All the signs of hyperexcitability in field potentials in the isolate...

A 59 year old man with ischaemic heart disease, developed the clinical and electromyographic changes of the Lambert-Eaton myasthenic syndrome after taking calcium antagonist, diltiazem. The symptoms appeared periodically with a rise and fall in serum level of diltiazem. Extensive search was made for systemic neoplasms and autoimmune diseases without success. Serum antibody to voltage operated c...