Ian Ashmole, PhD, S. Mark Duffy, PhD, Mark L. Leyland, PhD, Valerie S

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Presentation transcript:

CRACM/Orai ion channel expression and function in human lung mast cells Ian Ashmole, PhD, S. Mark Duffy, PhD, Mark L. Leyland, PhD, Valerie S. Morrison, BSc, Malcolm Begg, PhD, Peter Bradding, DM Journal of Allergy and Clinical Immunology Volume 129, Issue 6, Pages 1628-1635.e2 (June 2012) DOI: 10.1016/j.jaci.2012.01.070 Copyright © 2012 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 1 HLMCs express CRACM1, CRACM2, and CRACM3 mRNAs. RT-PCR of CRACM1, -2, and -3 and rig/S15 mRNA transcripts using RNA purified from HLMCs (A) and from HMC-1 cells (B) in the presence (+) or absence (−) of reverse transcriptase. C, Quantitative RT-PCR of CRACM mRNA transcripts in HLMCs relative to β-actin transcripts (mean ± SEM; n = 6-8). CRACM1 versus CRACM2, P = .0068. Journal of Allergy and Clinical Immunology 2012 129, 1628-1635.e2DOI: (10.1016/j.jaci.2012.01.070) Copyright © 2012 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 2 HLMCs express CRACM1 and CRACM2 proteins. A, B, and C, Representative Western blots using the indicated antibodies and lysates of HMC-1 and HLMCs (Fig 2, A and B) or A-20 cells and HLMCs (Fig 2, C). Three independent mast cell lysates were analyzed. D, Western blots using the indicated antibodies and lysates of HEK293 cells transiently transfected with vectors directing the expression of CRACM1-Myc (lane 1), CRACM2-Myc (lane 2), or CRACM3-Myc (lane 3). Journal of Allergy and Clinical Immunology 2012 129, 1628-1635.e2DOI: (10.1016/j.jaci.2012.01.070) Copyright © 2012 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 3 HLMCs express CRACM-channel currents when dialyzed with IP3. Subtracted whole-cell patch-clamp current-voltage (I-V) curves from HLMCs 4 minutes after dialysis with IP3 in 2 mM external Ca2+ (mean ± SEM; n = 42 cells) (A) and in 2 mM and then 10 mM external Ca2+ (mean ± SEM; n = 6) (B). C, Representative raw current traces from a single cell in the presence of IP3 (voltage protocol shown inset). Inhibition of IP3-dependent whole-cell current by (D) GSK-7975A and (E) Synta-66 (n = 4-6) (a negative value implies a contribution from CRACM channels to the baseline whole-cell current) and (F) 10 μM La3+ (n = 12) and (G) 10 μM Gd3+. Journal of Allergy and Clinical Immunology 2012 129, 1628-1635.e2DOI: (10.1016/j.jaci.2012.01.070) Copyright © 2012 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 4 HLMCs express CRACM-channel currents following FcεRI-dependent activation. Whole-cell patch-clamp current-voltage (I-V) curves of HLMCs within 4 minutes of FcεRI-dependent activation in (A) 2 mM external Ca2+ (mean ± SEM; n = 37 cells) and (B) 2 mM and then 10 mM external Ca2+ (mean ± SEM; n = 7). C, Representative raw current following FcεRI-dependent activation. Inhibition of IgE-dependent CRACM currents by (D) 1 μM GSK-7975A, (E) 1 μM Synta-66, and (F) 10 μM La3+ (n = 11 cells). G, Attenuation of the FcεRI-dependent increase in [Ca2+]i in HLMCs by 1 μM Synta-66. Journal of Allergy and Clinical Immunology 2012 129, 1628-1635.e2DOI: (10.1016/j.jaci.2012.01.070) Copyright © 2012 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 5 The CRACM-channel blockers GSK-7975A and Synta-66 inhibit HLMC histamine (A), LTC4 (B), and cytokine release (C) dose-dependently following FcεRI-dependent activation. Mean ± SEM for percentage inhibition (n = 5 for histamine and LTC4, n = 3 for cytokines). P < .05 for all conditions except Synta-66 TNFα analyzed by repeated-measures ANOVA on raw data. ∗P < .05 compared with control using Bonferroni post hoc test. Journal of Allergy and Clinical Immunology 2012 129, 1628-1635.e2DOI: (10.1016/j.jaci.2012.01.070) Copyright © 2012 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 6 The CRACM-channel blocker Synta-66 attenuates allergen-dependent human bronchial smooth muscle contraction (n = 4). P = .02 for rightward shift in allergen EC50. Journal of Allergy and Clinical Immunology 2012 129, 1628-1635.e2DOI: (10.1016/j.jaci.2012.01.070) Copyright © 2012 American Academy of Allergy, Asthma & Immunology Terms and Conditions