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Ecotin-Like ISP of L. major Promastigotes Fine-Tunes Macrophage Phagocytosis by Limiting the Pericellular Release of Bradykinin from Surface-Bound Kininogens: A Survival Strategy Based on the Silencing of Proinflammatory G-Protein Coupled Kinin B2 and B1 Receptors
المؤلفون المشاركون
Svensjö, Erik
Nogueira de Almeida, Larissa
Vellasco, Lucas
Scharfstein, Julio
Juliano, Luiz
المصدر
العدد
المجلد 2014، العدد 2014 (31 ديسمبر/كانون الأول 2014)، ص ص. 1-12، 12ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2014-09-10
دولة النشر
مصر
عدد الصفحات
12
التخصصات الرئيسية
الملخص EN
Inhibitors of serine peptidases (ISPs) expressed by Leishmania major enhance intracellular parasitism in macrophages by targeting neutrophil elastase (NE), a serine protease that couples phagocytosis to the prooxidative TLR4/PKR pathway.
Here we investigated the functional interplay between ISP-expressing L.
major and the kallikrein-kinin system (KKS).
Enzymatic assays showed that NE inhibitor or recombinant ISP-2 inhibited KKS activation in human plasma activated by dextran sulfate.
Intravital microscopy in the hamster cheek pouch showed that topically applied L.
major promastigotes (WT and Δ i s p 2 / 3 mutants) potently induced plasma leakage through the activation of bradykinin B2 receptors (B2R).
Next, using mAbs against kininogen domains, we showed that these BK-precursor proteins are sequestered by L.
major promastigotes, being expressed at higher % in the Δ i s p 2 / 3 mutant population.
Strikingly, analysis of the role of kinin pathway in the phagocytic uptake of L.
major revealed that antagonists of B2R or B1R reversed the upregulated uptake of Δ i s p 2 / 3 mutants without inhibiting macrophage internalization of WT L.
major.
Collectively, our results suggest that L.
major ISP-2 fine-tunes macrophage phagocytosis by inhibiting the pericellular release of proinflammatory kinins from surface bound kininogens.
Ongoing studies should clarify whether L.
major ISP-2 subverts TLR4/PKR-dependent prooxidative responses of macrophages by preventing activation of G-protein coupled B2R/B1R.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Svensjö, Erik& Nogueira de Almeida, Larissa& Vellasco, Lucas& Juliano, Luiz& Scharfstein, Julio. 2014. Ecotin-Like ISP of L. major Promastigotes Fine-Tunes Macrophage Phagocytosis by Limiting the Pericellular Release of Bradykinin from Surface-Bound Kininogens: A Survival Strategy Based on the Silencing of Proinflammatory G-Protein Coupled Kinin B2 and B1 Receptors. Mediators of Inflammation،Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-1043340
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Svensjö, Erik…[et al.]. Ecotin-Like ISP of L. major Promastigotes Fine-Tunes Macrophage Phagocytosis by Limiting the Pericellular Release of Bradykinin from Surface-Bound Kininogens: A Survival Strategy Based on the Silencing of Proinflammatory G-Protein Coupled Kinin B2 and B1 Receptors. Mediators of Inflammation No. 2014 (2014), pp.1-12.
https://search.emarefa.net/detail/BIM-1043340
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Svensjö, Erik& Nogueira de Almeida, Larissa& Vellasco, Lucas& Juliano, Luiz& Scharfstein, Julio. Ecotin-Like ISP of L. major Promastigotes Fine-Tunes Macrophage Phagocytosis by Limiting the Pericellular Release of Bradykinin from Surface-Bound Kininogens: A Survival Strategy Based on the Silencing of Proinflammatory G-Protein Coupled Kinin B2 and B1 Receptors. Mediators of Inflammation. 2014. Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-1043340
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-1043340
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
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