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- W2073264385 abstract "Adrenal chromaffin cells (CCs) express high-voltage activated calcium channels (high-VACCs) of the L, N and PQ subtypes; in addition, T-type low-VACCs are also expressed during embryo and neonatal life. Effects of the more frequently used T channel blockers NNC 55-0396 (NNC), mibefradil, and Ni2+ on the whole-cell Ba2+ current (IBa), the K+-elicited [Ca2+]c transients and catecholamine secretion have been studied in adult bovine CCs (BCCs) and rat embryo CCs (RECCs). NNC, mibefradil, and Ni2+ blocked BCC IBa with IC50 of 1.8, 4.9 and 70 μM, while IC50 to block IBa in RECCs were 2.1, 4.4 and 41 μM. Pronounced blockade of K+-elicited [Ca2+]c transients and secretion was also elicited by the three agents. However, the hypoxia-induced secretion (HIS) of catecholamine in RECCs was blocked substantially (75%) with thresholds concentrations of NCC (IC20 to block IBa); this was not the case for mibefradil and Ni2+ that required higher concentrations to block the HIS response. Thus, out of the three compounds, NNC seemed to be an adequate pharmacological tool to discern the contribution of T channels to the HIS response, without a contamination with high-VACC blockade." @default.
- W2073264385 created "2016-06-24" @default.
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- W2073264385 date "2015-03-01" @default.
- W2073264385 modified "2023-10-16" @default.
- W2073264385 title "Blockade by NNC 55-0396, mibefradil, and nickel of calcium and exocytotic signals in chromaffin cells: Implications for the regulation of hypoxia-induced secretion at early life" @default.
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- W2073264385 doi "https://doi.org/10.1016/j.ejphar.2015.01.025" @default.
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