Abstract:
:The mechanisms by which adenosine regulates the inflammatory reaction are poorly characterized. In this study, we investigated the effects of adenosine on neutrophil actin polymerization elicited by the chemotactic peptide N-formyl-methionyl-leucyl-phenylalanine (fMLP) or IgG-opsonized yeast particles. We used bodipy-phallacidin staining in combination with flow cytometry and found that adenosine markedly reduced actin polymerization triggered by IgG-yeast, whereas the effect on the fMLP-response was less pronounced. Similar or even more pronounced effects were obtained with the adenosine A2 receptor agonist 5'-N-ethylcarboxamidoadenosine (NECA), suggesting an A2 receptor-mediated mechanism. The following observations indicate that the A2 receptor-induced effects involve the cAMP-protein kinase A (PKA) signaling pathway: (1) a combination of NECA and the cAMP-specific phosphodiesterase (PDE) inhibitor Ro 20-1724 raised the cAMP content in both unstimulated and stimulated neutrophils and also further inhibited the actin dynamics; (2) the PKA inhibitor H89 reversed the inhibitory effects of NECA on the actin dynamics; (3) Ro 20-1724, isoproterenol and dibutyryl cAMP (DBcAMP) reduced actin polymerization in almost the same way as NECA did. NECA together with Ro 20-1724 impaired the fMLP-induced shape changes and cortical accumulation of actin filaments. In contrast, H89 potentiated the fMLP-induced formation of a submembranous ring of actin filaments. Neutrophils phagocytosing yeast particles in the presence of NECA and Ro 20-1724 were predominantly round in shape, and their ability to extend actin-rich pseudopods around the prey was reduced. These effects were partly antagonized by H89. In correlation with the effects on actin polymerization, NECA more effectively diminished IgG-induced upregulation of the beta2 integrin CD11b/CD18 than such upregulation induced by fMLP. The inhibitory effects of A2-receptor activation on actin dynamics and beta2 integrin expression in neutrophils exposed to IgG-yeast were also associated with a cAMP-dependent reduction of the phagocytic capacity. In conclusion, we show that adenosine inhibits actin dynamics and shape changes in neutrophils via a cAMP-dependent pathway. This finding further characterizes the mechanisms by which adenosine functions as an important modulator of the inflammatory response.
journal_name
Eur J Cell Bioljournal_title
European journal of cell biologyauthors
Zalavary S,Bengtsson Tdoi
10.1016/S0171-9335(98)80055-1subject
Has Abstractpub_date
1998-02-01 00:00:00pages
128-39issue
2eissn
0171-9335issn
1618-1298pii
S0171-9335(98)80055-1journal_volume
75pub_type
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journal_title:European journal of cell biology
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abstract::The sites of calcium-dependent dibasic endoprotease (Kex2; yscF) activity have been ultracytochemically localized in exponential cultures of haploid (alpha) wild-type strain of Saccharomyces cerevisiae, in its pep4-3 mutant and in the kex2 mutant. The gently prefixed cells were thoroughly washed and incubated in a buf...
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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abstract::The mammalian skin has a photosensitive system comprised by several opsins, including rhodopsin (OPN2) and melanopsin (OPN4). Recently, our group showed that UVA (4.4 kJ/m2) leads to immediate pigment darkening (IPD) in murine normal and malignant melanocytes. We show the role of OPN2 and OPN4 as UVA sensors: UVA-indu...
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
pub_type: 杂志文章
doi:
更新日期:1981-06-01 00:00:00
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journal_title:European journal of cell biology
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doi:
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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journal_title:European journal of cell biology
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doi:
更新日期:1996-12-01 00:00:00
abstract::Na/K-ATPase of salt-stressed salt glands of the domestic duck (Anas platyrhynchos) was purified in membrane-bound form by incubation of the microsomal fraction with sodium dodecylsulphate and ATP followed by discontinuous sucrose gradient centrifugation. Gel electrophoresis of the purified plasma membrane preparation ...
journal_title:European journal of cell biology
pub_type: 杂志文章
doi:
更新日期:1983-01-01 00:00:00
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journal_title:European journal of cell biology
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