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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Augmentation of stimulated eosinophil degranulation by VLA-4 (CD49d)- mediated adhesion to fibronectin.

We examined the effect of VLA-4- mediated adhesion to purified fibronectin (FN) on the stimulated release of the granular protein, eosinophil peroxidase ( EPO), in human peripheral blood eosinophils. In initial studies, optimal time-course and concentration-effect relationships were determined; eosinophil adhesion to FN-coated styrene plates was maximal in wells coated with 10 micrograms/ml FN after incubation in the wells for 60 min (17,097 +/- 3,670 adherent eosinophils/well versus 6,789 +/- 925 adherent eosinophils/well in control wells; P < 0.005). Treatment of eosinophils with 10(-8) to 10(-6) M formylmethionylleucyl-phenylalanine (FMLP) + 5 micrograms/ml cytochalasin B (CYTB) caused a concentration-dependent increase in EPO release, which was augmented by preincubation of eosinophils for 120 min in FN-coated (10 micrograms/ml) styrene wells versus eosinophils preincubated in control wells. At 10(-6) M FMLP+CYTB, initial adhesion to FN for 120 min caused an increase in the secretion of EPO from 367 +/- 26 to 485 +/- 25 ng/10(6) eosinophils (P = 0.0001). Treatment of eosinophils during incubation in FN-coated wells with the anti-VLA-4 monoclonal antibody HP2/1 attenuated stimulated EPO secretion caused by 10(-6) M FMLP+CYTB from 497 +/- 40 to 285 +/- 26 ng/10(6) eosinophils (P < 0.02). Similarly, treatment with HP2/1 caused a decrease in eosinophil adhesion to FN-coated styrene from 12,693 +/- 1,866 to 6,206 +/- 852 adherent cells/FN-coated well (P < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)[1]


  1. Augmentation of stimulated eosinophil degranulation by VLA-4 (CD49d)-mediated adhesion to fibronectin. Neeley, S.P., Hamann, K.J., Dowling, T.L., McAllister, K.T., White, S.R., Leff, A.R. Am. J. Respir. Cell Mol. Biol. (1994) [Pubmed]
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