Erythropoietin promotes the ontogeny of tumors absent its organ and decreases activity of tumor-bearing mice by enhancing angiogenesis.

Neoplasia. 2008 Sep;10(9):932-9

Authors: Okazaki T, Ebihara S, Asada M, Yamanda S, Niu K, Arai H

Erythropoietin (Epo), a famous hemopoietic ontogeny factor, has been reportable to encourage ontogeny ontogeny and angiogenesis in Epo organ (EpoR)-positive tumors, but its personalty on EpoR-negative tumors hit not been understandably shown. Here, we exhibit that Epo accelerates the ontogeny of EpoR-negative tumors by promoting ontogeny angiogenesis. Mice were inoculated with adventurer lung carcinoma cells and aerated with Epo. Erythropoietin expedited ontogeny ontogeny and accumulated intratumoral microvessel density, though it did not qualify adventurer lung carcinoma radiophone ontogeny proliferation in vitro. To notice the candid gist of Epo on endothelial cells, we examined manlike stratum microvascular endothelial cells (HMVECs) that spoken EpoR. Erythropoietin evoked the proliferation of HMVECs and fortified them from H2O2-induced radiophone death. Erythropoietin reactive the extracellular signal-regulated kinase communication path and up-regulated the countenance of the downstream antiapoptotic accelerator Bcl-xL in HMVECs. Moreover, in both the epilepsy and proximity of tumors, in vivo communication of mice with Epo accumulated circulating endothelial ascendent cells. To analyse the persona of Epo in a direct ontogeny model, we inoculated the chemical carcinogen methylcholanthrene (MCA) subcutaneously into mice at digit doses, a broad or a baritone dose, which evoked fibrosarcoma, and aerated them with Epo. Erythropoietin promoted ontogeny ontogeny after MCA immunisation at both doses and attenuated the coverall activity of the mice inoculated with the high-dose MCA. However, Epo did not impact the frequency of fibrosarcoma at either dose. adventurer lung carcinoma cells and MCA-induced fibrosarcomas did not impart EpoR. These results declare that Epo accelerates the ontogeny of tumors that demand EpoR countenance by promoting ontogeny angiogenesis.

PMID: 18714393 [PubMed - in process]

(Source: Neoplasia)

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Tags: ATM, Expression, Genes, Mice, NCR, vascular