کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8338434 | 1541005 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Progesterone-induced blocking factor is hormonally regulated in human astrocytoma cells, and increases their growth through the IL-4R/JAK1/STAT6 pathway
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
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چکیده انگلیسی
Astrocytomas are the most frequent and aggressive primary brain tumors in humans and constitute the leading cause of brain cancer related deaths. There are reports indicating that progesterone (P4) participates in the growth of astrocytomas through the interaction with its intracellular receptor (PR). Recently, it has been found that P4 induces the growth of several tumors through the up-regulation of progesterone-induced blocking factor (PIBF), a protein that has been related to the immunologic and proliferative actions of P4. U373 cells derived from a human astrocytoma grade III were used to study the role of P4 in PIBF expression and the effects of the latter in cell number. By using RT-PCR and Western blot techniques, we found that U373 cells express PIBF mRNA and protein. P4 (10Â nM and 100Â nM) increased PIBF mRNA expression after 1 and 3Â h of treatment, respectively, and this increase lasted 24Â h. This effect was blocked by the PR antagonist, RU486. Two PIBF isoforms were detected: one of 57Â kDa and the predominant one of 90Â kDa. The content of the 90Â kDa isoform increased after 12Â h of P4 treatment, and RU486 also blocked this increase. We observed that PIBF was released into the extracellular medium, being the 57Â kDa isoform the most abundant in this compartment. Immunofluorescence analysis showed that PIBF was localized in both the cytoplasm and nucleus. The effects of PIBF on cell number were analyzed for five consecutive days. PIBF (200Â ng/mL) significantly increased the number of U373 cells on days 2-5. Co-immunoprecipitation and Western blot assays revealed that PIBF associates to IL-4 receptor, and increases JAK1 and STAT6 phosphorylation at 20Â min. Our results suggest that P4 regulates PIBF expression in U373 cells through PR, and that PIBF increases cell number through IL-4 receptor/JAK1/STAT6 signaling pathway.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Steroid Biochemistry and Molecular Biology - Volume 144, Part B, October 2014, Pages 463-470
Journal: The Journal of Steroid Biochemistry and Molecular Biology - Volume 144, Part B, October 2014, Pages 463-470
نویسندگان
Aliesha González-Arenas, Paulina Valadez-Cosmes, Carolina Jiménez-Arellano, Mónica López-Sánchez, Ignacio Camacho-Arroyo,