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The sections in this article are: Methods to Explore Local Control Local Control in the Anterior Pituitary Evidence for Intercellular Communication in the Anterior Pituitary Putative Paracrine Factors Local Control in the Adrenal Cortex and Medulla Morphological Correlates of Medulla–Cortex Interactions Putative Paracrine and Autocrine Factors in the Medulla Putative Paracrine and Autocrine Factors in the Adrenal Cortex Local Control in the Testis Evidence for Functional Interaction Between Different Testicular Cell Types Local Control by Steroids Local Control by Regulatory Peptides Local Control by Biogenic Amines and Nitrous Oxide Local Control by Polypeptide Growth Factors Local Control by Substances From Testicular Macrophages Local Control in the Ovary Evidence for Functional Interaction Between Thecal Cells and Granulosa Cells Local Control by Steroids Local Control by Regulatory Peptides Opioid Peptides Local Control by Polypeptide Growth Factors Paracrine Factors Mediating Actions of Thyroid and Steroid Hormones Local Control in Pancreatic Endocrine Cells Are Insulin, Glucagon, Somatostatin, and Pancreatic Polypeptide Paracrine and Autocrine Factors in the Pancreatic Islets? Local Control by Other Regulatory Peptides Local Control by Biogenic Amines Local Control by Polypeptide Growth Factors Local Control in the Thyroid Gland Local Control by Regulatory Peptides Local Control by Polypeptide Growth Factors Local Control in the Parathyroid Gland
The sections in this article are: Methods to Explore Local Control Local Control in the Anterior Pituitary Evidence for Intercellular Communication in the Anterior Pituitary Putative Paracrine Factors Local Control in the Adrenal Cortex and Medulla Morphological Correlates of Medulla–Cortex Interactions Putative Paracrine and Autocrine Factors in the Medulla Putative Paracrine and Autocrine Factors in the Adrenal Cortex Local Control in the Testis Evidence for Functional Interaction Between Different Testicular Cell Types Local Control by Steroids Local Control by Regulatory Peptides Local Control by Biogenic Amines and Nitrous Oxide Local Control by Polypeptide Growth Factors Local Control by Substances From Testicular Macrophages Local Control in the Ovary Evidence for Functional Interaction Between Thecal Cells and Granulosa Cells Local Control by Steroids Local Control by Regulatory Peptides Opioid Peptides Local Control by Polypeptide Growth Factors Paracrine Factors Mediating Actions of Thyroid and Steroid Hormones Local Control in Pancreatic Endocrine Cells Are Insulin, Glucagon, Somatostatin, and Pancreatic Polypeptide Paracrine and Autocrine Factors in the Pancreatic Islets? Local Control by Other Regulatory Peptides Local Control by Biogenic Amines Local Control by Polypeptide Growth Factors Local Control in the Thyroid Gland Local Control by Regulatory Peptides Local Control by Polypeptide Growth Factors Local Control in the Parathyroid Gland
Summary In this study, differential mRNA expression patterns of prolactin receptor (PRLR) in the hypothalamus and gonads, and the correlation with follicle stimulating hormone (FSH) and luteinizing hormone (LH) in striped hamster serum from spring, summer, autumn and winter were analyzed. Mature female and male striped hamsters in oestrus were used. Expression levels of PRLR in the hypothalamus, ovaries and testis from the summer and winter individuals were significantly higher compared with levels from the spring and autumn, whereas FSH and LH serum concentrations from summer and winter individuals were significantly lower compared with that from the spring and autumn. PRLR expression levels in hypothalamus, ovaries and testis were negatively correlated with FSH and LH serum concentrations, illustrating that PRLR might negatively regulate seasonal reproductive activity. PRLR expression levels in ovaries and testes were significantly higher compared with levels in the hypothalamus, suggesting that the regulative effects of PRLR in gonads might be significantly higher compared with that in the hypothalamus. Furthermore, PRLR expression levels from the spring, summer, autumn and winter seasons in the hypothalamus and gonads were significantly higher in females compared with levels in males, indicating that the regulative effect of PRLR might be sex dependent. Taken together, this study helps to understand in depth the seasonal regulative reproduction mechanism of striped hamsters to reasonably control population abundance.
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