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Background: Camelidae are inducing ovulators, ovulation is tightly regulated by multiple factors, and understanding the biological mechanisms underlying follicular development, hormone secretion and ovulation requires investigation of the potential molecular pathways. However, little is known about the pathways of these factors in the camel. To screening and identification candidate biomarkers after inducing ovulators in ovary.Methods: In this paper, the quantitative proteomics method iTRAQ analysis technology was used to analyze the proteomic differences of ovarian before and after induced ovulation in Bactrian camels. The differentially expressed protein was validated by Western blot, qRT-PCR and Immunofluorescence staining analysis.Results: A total of 5,075 ovarian expressed proteins were detected, and 404 proteins were differentially expressed (264 up-regulated, 140 down-regulated) in samples from treated versus control camels. Gene ontology annotation identified potential functions of the differentially expressed proteins (DEPs). We validated the differential expression for a subset of these proteins using western blotting and immunofluorescence staining. Three DEPs (FST, NR5A1 and PRL) were involved in neurochemical signal transduction, endocrine and reproductive hormones regulatory processes. KEGG analysis indicated the involvement of several pathways, such as calcium, cAMP, gonadotropin-releasing hormone, MAPK, and neuroactive ligand-receptor signaling pathways, further suggesting that the induced ovulation process depends on the hypothalamic-pituitary-ovarian axis. Conclusions: This study is the first to perform quantitative proteomic investigation by iTRAQ labeling and LC-MS/MS to identify differentially expressed proteins induced ovulation in Bactrian camels. Our study has revealed distinct molecular functions and metabolic pathways that are active during reproduction in Bactrian camels. These results have demonstrated the pivotal role played by 3 DEPs in the modulation and activation of the reproductive axis during induced ovulation in the Bactrian camel, followed by the measurement of selected proteins using more targeted methods, offers a promising approach for studying potential mechanism of ovary development and ovulation. |
