TY - JOUR
T1 - Store-operated Ca2+ influx in airway smooth muscle
T2 - Interactions between volatile anesthetic and cyclic nucleotide effects
AU - Prakash, Y. S.
AU - Iyanoye, Adeyemi
AU - Ay, Binnaz
AU - Sieck, Gary C.
AU - Pabelick, Christina M.
PY - 2006/11
Y1 - 2006/11
N2 - BACKGROUND: Volatile anesthetics produce bronchodilation in part by depleting sarcoplasmic reticulum Ca stores in airway smooth muscle (ASM). Other bronchodilatory drugs are known to act via cyclic nucleotides (cyclic adenosine 3′,5′-cyclic monophosphate, cyclic guanosine 3′,5′- cyclic monophosphate). Intracellular Ca regulation in ASM involves plasma membrane Ca influx, including that triggered by sarcoplasmic reticulum Ca depletion (store-operated Ca entry [SOCE]). The authors hypothesized that anesthetics and bronchodilatory agents interact in inhibiting SOCE, thus enhancing ASM relaxation. METHODS: In enzymatically dissociated porcine ASM cells imaged using fluorescence microscopy, sarcoplasmic reticulum Ca was depleted by 1 μm cyclopiazonic acid in 0 extracellular Ca, nifedipine, and potassium chloride (preventing Ca influx through L-type channels and SOCE). Extracellular Ca was rapidly reintroduced to selectively activate SOCE in the presence or absence of 1 minimum alveolar concentration (MAC) halothane, isoflurane, or sevoflurane. Anesthetic interference with SOCE regulation by cyclic nucleotides was examined by activating SOCE in the presence of (1) 1 μm acetylcholine, (2) 100 μm dibutryl cyclic adenosine 3′,5′-cyclic monophosphate, or (3) 100 μm 8-bromo-cyclic guanosine 3′,5′-cyclic monophosphate. RESULTS: SOCE was enhanced by acetylcholine, whereas volatile anesthetics and both cyclic nucleotides partially inhibited Ca influx. Preexposure to 1 or 2 MAC anesthetic (halothane > isoflurane > sevoflurane) inhibited SOCE. Only halothane and isoflurane inhibited acetylcholine-induced augmentation of Ca influx, and significantly potentiated cyclic nucleotide inhibition such that no influx was observed in the presence of anesthetics and cyclic nucleotides. CONCLUSIONS: These data indicate that volatile anesthetics prevent sarcoplasmic reticulum refilling by inhibiting SOCE and enhancing cyclic nucleotide blunting of Ca influx in ASM. Such interactions likely result in substantial airway relaxation in the presence of both anesthetics and bronchodilatory agents such as β agonists or nitric oxide.
AB - BACKGROUND: Volatile anesthetics produce bronchodilation in part by depleting sarcoplasmic reticulum Ca stores in airway smooth muscle (ASM). Other bronchodilatory drugs are known to act via cyclic nucleotides (cyclic adenosine 3′,5′-cyclic monophosphate, cyclic guanosine 3′,5′- cyclic monophosphate). Intracellular Ca regulation in ASM involves plasma membrane Ca influx, including that triggered by sarcoplasmic reticulum Ca depletion (store-operated Ca entry [SOCE]). The authors hypothesized that anesthetics and bronchodilatory agents interact in inhibiting SOCE, thus enhancing ASM relaxation. METHODS: In enzymatically dissociated porcine ASM cells imaged using fluorescence microscopy, sarcoplasmic reticulum Ca was depleted by 1 μm cyclopiazonic acid in 0 extracellular Ca, nifedipine, and potassium chloride (preventing Ca influx through L-type channels and SOCE). Extracellular Ca was rapidly reintroduced to selectively activate SOCE in the presence or absence of 1 minimum alveolar concentration (MAC) halothane, isoflurane, or sevoflurane. Anesthetic interference with SOCE regulation by cyclic nucleotides was examined by activating SOCE in the presence of (1) 1 μm acetylcholine, (2) 100 μm dibutryl cyclic adenosine 3′,5′-cyclic monophosphate, or (3) 100 μm 8-bromo-cyclic guanosine 3′,5′-cyclic monophosphate. RESULTS: SOCE was enhanced by acetylcholine, whereas volatile anesthetics and both cyclic nucleotides partially inhibited Ca influx. Preexposure to 1 or 2 MAC anesthetic (halothane > isoflurane > sevoflurane) inhibited SOCE. Only halothane and isoflurane inhibited acetylcholine-induced augmentation of Ca influx, and significantly potentiated cyclic nucleotide inhibition such that no influx was observed in the presence of anesthetics and cyclic nucleotides. CONCLUSIONS: These data indicate that volatile anesthetics prevent sarcoplasmic reticulum refilling by inhibiting SOCE and enhancing cyclic nucleotide blunting of Ca influx in ASM. Such interactions likely result in substantial airway relaxation in the presence of both anesthetics and bronchodilatory agents such as β agonists or nitric oxide.
UR - http://www.scopus.com/inward/record.url?scp=33750470065&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33750470065&partnerID=8YFLogxK
U2 - 10.1097/00000542-200611000-00019
DO - 10.1097/00000542-200611000-00019
M3 - Article
C2 - 17065892
AN - SCOPUS:33750470065
SN - 0003-3022
VL - 105
SP - 976
EP - 983
JO - Anesthesiology
JF - Anesthesiology
IS - 5
ER -