Alterations in mRNA expression of rat astrocytes co-cultured with c6 glioma cells and impact of glioma-conditioned astrocytes on dendritic cell maturation


A.A. Chernysheva(1), I.V. Chekhonin(1), A.O. Sosnovtseva(1), S.A. Cherepanov(1 , 2), K. Sh. Kardashova(1), O.I. Gurina(1), A.S. Silantyev(3), S.A. Pavlova(4), G.V. Pavlova(4, 5, 6), T.A. Savelieva(7, 8), V.B. Loshhenov(7, 8), V.P. Chekhonin(1, 2) 1-V.P. Serbsky National Medical Research Centre for Psychiatry and Narcology, Ministry of Health of the Russian Federation, Kropotkinskiy pereulok, 23, Moscow, 119034, Russian Federation; 2-Pirogov Russian National Research Medical University, Ostrovitianov Street, 1, Moscow, 117997, Russian Federation; 3-National Scientific Research Center on Addictions – a branch of the V.P. Serbsky National Medical Research Centre for Psychiatry and Narcology, Ministry of Health of the Russian Federation, Malyi Mogiltsevsky pereulok, 3, Moscow, 119002, Russian Federation; 4-Institute of Institute of Higher Nervous Activity and Neurophysiology of the Russian Federation, Butlerova St., 5A, Moscow, 117485, Russian Federation; 5-Sechenov First Moscow State Medical University, Trubetskaya Street, 8, Moscow, 119991, Russian Federation; 6-«N.N. Burdenko National Medical Research Center of Neurosurgery» of the Ministry of Health of the Russian Federation, 4th Tverskaya-Yamskaya Street, 16, Moscow, 125047, Russian Federation; 7-Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov St., 38, Moscow, 119991, Russian Federation; 8National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse, 31, Moscow, 115409, Russian Federation E-mail: [email protected]

Introduction. Under the influence of glioma cells, peritumoral zone astrocytes may acquire tumorigenic phenotype, particularly due to the suppression of immunocompetent cells. The aim of the study. Investigate the changes in the gene expression profile of glioma-conditioned rat astrocytes and the impact of conditioned astrocyte cellular extracts (lysates) on dendritic cell maturation. Methods. We compared glioma-conditioned astrocytes with C6 glioma cells or native astrocytes. Astrocyte conditioning was achieved by indirect co-culturing of native astrocytes with C6 glioma cells. The expression profile was assessed with real-time PCR. The phenotype of dendritic cells pulsed with extracts of glioma-conditioned astrocytes, C6 glioma cells and native astrocytes was studied with flow cytometry and ELISA. Dendritic cells were also used for rat immunization. We measured serum interferon-γ dynamics and cytokine production (interferon-γ, interleukins 4 and 10) by mononuclear cells of immunized rats. Results. Conditioned astrocytes showed a tendency to upregulation of interleukin 6 mRNA. They also demonstrated lower expression of PDGFB chain mRNA. Glioma cells expressed higher levels of nestin, GFAP, and CD44 mRNA. CCL2 chemokine mRNA was expressed at lower amounts in glioma cells and glioma-conditioned astrocytes. Dendritic cells pulsed with extracts of conditioned astrocytes yielded a lower increase of serum and mononuclear-derived interferon-γ after rat immunization. These dendritic cells exposed less CD11b/c but produced more interleukin 12 in comparison. Conclusion. The findings suggest that astrocytes may undergo phenotype transformation under the influence of glioma cells and obtain traits different from glioma cells or native astrocytes and similar to both cellular types at the same time.
C6 glioma, conditioned astrocytes, dendritic cells

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