Adenosine, endogenous purine nucleoside, is an ATP metabolite that also acts as an extracellular signaling molecule. The concentration of extracellular adenosine rises during hypoxia and cell damage leading to numerous pleiotropic effects. Although a high concentration of adenosine was found at burn injury, the effect has not been well elucidated. We have studied human peripheral blood myeloid cell, due to their expression of specific adenosine receptors and capacity to migrate to the site of burn injury. We have shown that myeloid cells after 72 hours of stimulation of adenosine receptors develop altered expression of surface antigens: preserved monocyte's marker CD14 with already expressed dendritic cell markers (CD209, CD1a). Whereas untreated cells have already lost monocyte marker in 72 hours, and express CD1a more abundantly. Adenosine modified myeloid cells express also higher levels of mRNA of proinflammatory cytokines and chemoattractants (IL-6, IL-8, IL-1 b). Using mouse model of the burn injury we have shown, that adenosine modified bone marrow derived myeloid cells injected in the site of the injury promote migration of granulocytes, monocytes, macrophages, and fibroblasts on the 7th day after burn. Thus, stimulation of adenosine receptors alters differentiation and function of myeloid cells. In the site of burn injury adenosine modified myeloid cells augment cell migration due to paracrine factors.
Adenozin - éndogennyĭ purinovyĭ nukleozid, obrazuiushchiĭsia v protsesse metabolizma ATR i obladaiushchiĭ svoĭstvam signal'noĭ molekuly. Kontsentratsiia adenozina povyshaetsia pri gipoksii i pri povrezhdenii kletok. Bylo obnaruzheno, chto lokal'naia kontsentratsiia adenozina sushchestvenno povyshaetsia pri ozhoge, no ego éffekty v ochage povrezhdeniia prakticheski ne izucheny. Tsirkuliruiushchie mieloidnye kletki nesut na svoeĭ poverkhnosti spetsificheskie retseptory k adenozinu, i pri ozhoge migriruiut v zonu povrezhdeniia. My pokazali, chto mieloidnye kletki pri stimuliatsii adenozinovykh retseptorov uzhe cherez 72 ch posle nachala kul'tivirovaniia priobretali otlichnyĭ ot ne stimulirovannykh adenozinom kletok antigennyĭ fenotip - sokhraniali ékspressiiu monotsitarnogo markera CD14 pri razvitii ékspressii markerov dendritnykh kletok: CD209, CD1a. Takie kletki imeli takzhe bolee vysokiĭ uroven' ékspressii mRNK provospalitel'nyk h tsitokinov i khemoattraktantov (IL-6, IL-8, IL-1 b). In"etsirovannye v ochag termicheskogo povrezhdeniia, mieloidnye kletki modifitsirovannye adenozinom uvelichivali ob"emnuiu plotnost' smeshannogo kletochnogo infil'trata (granulotsitov, monotsitov, fibroblastov) na 7 sutki. Takim obrazom, my ustanovili, chto odnim iz éffektov adenozina v ochage termicheskogo povrezhdeniia iavliaetsia povyshenie migratsii granulotsitov i monotsitov v otvet na povyshennuiu narabotku parakrinnykh faktorov mieloidnymi kletkami.
Keywords: adenosine; burn injury; monocyte; paracrine factor.