کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1934624 1050645 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Inefficient phagosome maturation in infant macrophages
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Inefficient phagosome maturation in infant macrophages
چکیده انگلیسی

The quantitative and qualitative differences between the immune systems of infants and adults have been extensively investigated in the context of adaptive immunity. Here, we demonstrate that the infantile innate immune system is immature and weak against bacterial infections. Upon infection by Escherichia coli, macrophages from infantile mice showed a lower performance in killing the bacteria. In infant macrophages, bacteria were taken up relatively normally and delivered into lysosomal compartments, but not efficiently digested. The inefficient bacterial killing in infant macrophages was correlated with impaired acidification of the lysosomal compartments and reduced lysosomal recruitment of Rab7, an essential component of the acidification process. The acidification defect was not intrinsic to the cells, and was rescued by pretreatment with interferon-γ. Thus, we propose that the limited capacity of phagosome maturation is one of the major causes of the high sensitivity to infectious microorganisms during infancy and that the specific cytokine milieu shapes the nature of infantile innate immunity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 375, Issue 1, 10 October 2008, Pages 113–118
نویسندگان
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