کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5666773 1591543 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Involvement of adenosine A3 receptors in the chemotactic navigation of macrophages towards apoptotic cells
موضوعات مرتبط
علوم زیستی و بیوفناوری ایمنی شناسی و میکروب شناسی ایمونولوژی
پیش نمایش صفحه اول مقاله
Involvement of adenosine A3 receptors in the chemotactic navigation of macrophages towards apoptotic cells
چکیده انگلیسی


- Apyrase treatment destroys the migration of macrophages towards apoptotic thymocytes.
- Addition of NECA to macrophages reconstitutes chemotaxis in the presence of apyrase.
- Loss of A3R alone results in the loss of chemotactic navigation of macrophages.
- Injected apoptotic cells are cleared less efficiently in the peritoneum of A3R null mice.
- Clearance of apoptotic thymocytes in the thymus is not affected in the A3R null mice.

The first step in the clearance of apoptotic cells is chemotactic migration of macrophages towards the apoptotic cells guided by find-me signals provided by the dying cells. Upon sensing the chemotactic signals, macrophages release ATP. ATP is then degraded to ADP, AMP and adenosine to trigger purinergic receptors concentrated at the leading edge of the cell. Previous studies have shown that in addition to the chemotactic signals, this purinergic autocrine signaling is required to amplify and translate chemotactic signals into directional motility. In the present study the involvement of adenosine A3 receptors (A3R) was studied in the chemotactic migration of macrophages directed by apoptotic thymocyte-derived find-me signals. By taking video images in vitro, we demonstrate 1, by administering apyrase, which degrades ATP and ADP, that the purinergic autocrine signaling is required for maintaining both the velocity and the directionality of macrophage migration towards the apoptotic thymocytes; 2, by readding 5′-N-ethylcarboxamidoadenosine, an adenosine analogue, to apyrase treated cells that the adenosine receptor signaling alone is sufficient to act so; and 3, by studying migration of various adenosine receptor null or adenosine receptor antagonist-treated macrophages, that the individual loss of the A3R signaling leads to the loss of chemotactic navigation. Though loss of A3Rs does not affect the phagocytotic capacity of macrophages, intraperitoneally-injected apoptotic thymocytes were cleared with a delayed kinetics by A3R null macrophages in vivo due to the impaired chemotactic navigation. All together these data demonstrate the involvement of macrophage A3Rs in the proper chemotactic navigation and consequent in vivo clearance of apoptotic cells. Interestingly, loss of A3Rs did not affect the in vivo clearance of apoptotic thymocytes in the dexamethasone-treated thymus.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Immunology Letters - Volume 183, March 2017, Pages 62-72
نویسندگان
, , , , , , , , ,