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- W2100743485 abstract "The ectoenzyme CD38 catalyzes synthesis and degradation of cyclic ADP ribose in airway smooth muscle (ASM). The proinflammatory cytokine TNFalpha, which enhances agonist-induced intracellular Ca(2+) ([Ca(2+)](i)) responses, has been previously shown to increases CD38 expression. In the present study, we tested the hypothesis that the effects of TNFalpha on CD38 expression vs. changes in [Ca(2+)](i) regulation in ASM cells are linked. Using isolated human ASM cells, CD38 expression was either increased (transfection) or knocked down [small interfering RNA (siRNA)], and [Ca(2+)](i) responses to sarcoplasmic reticulum depletion [i.e., store-operated Ca(2+) entry (SOCE)] were evaluated in the presence vs. absence of TNFalpha. Results confirmed that TNFalpha significantly increased CD38 expression and ADP-ribosyl cyclase activity, an effect inhibited by CD38 siRNA, but unaltered by CD38 overexpression. CD38 suppression blunted, whereas overexpression enhanced, ACh-induced [Ca(2+)](i) responses. TNFalpha-induced enhancement of [Ca(2+)](i) response to agonist was blunted by CD38 suppression, but enhanced by CD38 overexpression. Finally, TNFalpha-induced increase in SOCE was blunted by CD38 siRNA and potentiated by CD38 overexpression. Overall, these results indicate a critical role for CD38 in TNFalpha-induced enhancement of [Ca(2+)](i) in human ASM cells, and potentially to TNFalpha augmentation of airway responsiveness." @default.
- W2100743485 created "2016-06-24" @default.
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- W2100743485 date "2008-02-01" @default.
- W2100743485 modified "2023-10-12" @default.
- W2100743485 title "Regulation of store-operated Ca<sup>2+</sup>entry by CD38 in human airway smooth muscle" @default.
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- W2100743485 doi "https://doi.org/10.1152/ajplung.00394.2007" @default.
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