Caffeine and 2-Aminoethoxydiphenyl Borate (2-APB) Have Different Ability to Inhibit Intracellular Calcium Mobilization in Pancreatic Acinar Cell

Inositol 1,4,5-trisphosphate receptors (InsP3Rs) modulate Ca2+ release from intracellular Ca2+ store and are extensively expressed in the membrane of endoplasmic/sarcoplasmic reticulum and Golgi. Although caffeine and 2-aminoethoxydiphenyl borate (2-APB) have been widely used to block InsP3Rs, the use of these is limited due to their multiple actions. In the present study, we examined and compared the ability of caffeine and 2-APB as a blocker of Ca2+ release from intracellular Ca2+ stores and Ca2+ entry through store-operated Ca2+ (SOC) channel in the mouse pancreatic acinar cell. Caffeine did not block the Ca2+ entry, but significantly inhibited carbamylcholine (CCh)-induced Ca2+ release. In contrast, 2-APB did not block CCh-induced Ca2+ release, but remarkably blocked SOC-mediated Ca2+ entry at lower concentrations. In permeabilized acinar cell, caffeine had an inhibitory effect on InsP3-induced Ca2+ release, but 2-APB at lower concentration, which effectively blocked Ca2+ entry, had no inhibitory action. At higher concentrations, 2-APB has multiple paradoxical effects including inhibition of InsP3-induced Ca2+ release and direct stimulation of Ca2+ release. Based on the results, we concluded that caffeine is useful as an inhibitor of InsP3R, and 2-APB at lower concentration is considered a blocker of Ca2+ entry through SOC channels in the pancreatic acinar cell.

Drinking Problems of Hepatitis B Virus Healthy Carriers in Korean Population

BACKGROUND: Heavy drinking may be a cause of serious health problems in hepatitis B virus carriers. The aim of this study was to reveal the degree of drinking problems in the Korean hepatitis B virus healthy carriers. METHODS: The subjects were 218 hepatitis B virus healthy carriers (124 males and 94 females) recruited from those who visited the Health Promotion Center of Chungnam National University Hospital for a general health check-up. Drinking problems of the subjects were evaluated by the AUDIT (Alcohol Use Disorders Identification Test) questionnaire. RESULTS: The AUDIT scores (mean+/-SD) of the male subjects (9.6+/-7.9) were significantly (P <0.001) higher than those of the female subjects (2.7+/-5.2). The individuals with heavy drinking (more than 14 drinks in males and 7 drinks in females per week) are 24 (19.4%) in males and 5 (5.3%) in females. Alcohol use disorders were suspected in 36 (29.0%) males and 4 (4.3%) females. CONCLUSION: It is suggested that, in Korea, clinical attention in primary health care should be focused on reducing the alcohol consumption among the hepatitis B virus carriers, considering a large proportion have drinking problems and the possible harmful effect on their health by heavy drinking.