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Effects of central infusions of neuropeptide Y on the somatotropic axis in sheep fed on two levels of protein

100%
Gladysz A., Krejci P., Simunek J., Polakowska J.
Acta Neurobiologiae Experimentalis
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2001
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vol. 61
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issue 4
255-266
EN
Effects of infusions of neuropeptide Y (NPY) into 3rd ventricle of growing sheep fed on diets containing restricted (R) or elevated (E) levels of protein on the immunoreactive (ir) somatostatin neurones, ir somatotrophs, growth hormone (GH) concentration in the blood plasma were studied. The long-term restriction of protein in the diet elicited: enhancing irSS content in periventricular perikarya; diminishing irSS stores in the median eminence and elevating the number ir somatotrophs and content of irGH. NPY infusions enhanced the content of irSS in perikarya in sheep fed on E diet and diminished the number of ir somatotrophs and content of irGH of sheep fed on R diet. The R diet as well as NPY infusions caused an increase in GH mean concentrations in the blood plasma. Obtained results suggest that stimulatory effect of restricted feeding and/or NPY action on GH secretion can be due to attenuated SS output. Since dietary restrictions and exogenous NPY have similar influence on the activation of GH secretion, we suggest that NPY could be a neuromodulatory link between nutritional cues and somatotropic axis in sheep.
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Photoperiod affects distribution of dynorphin A in the brain of Siberian hamster

75%
Meyza K. Z., Sotowska-BrochockaJ.
Acta Neurobiologiae Experimentalis
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2006
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vol. 66
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issue 3
207-213
EN
Dynorphin A1?17 (DYN A1?17) acting in the CNS is known to affect thermoregulation, water and energy balance in the short time scale. In this study a long-term alteration of these functions induced by changes of day length in the highly photoperiodic species, the Siberian hamster (Phodopus sungorus) was studied using immunohistochemistry for DYN A1?17. We found that in the long day (LD, L:D 16 h:8 h) more brain areas express DYN A1?17 peptide than in the short day (SD, L:D 8 h:16 h) conditions. Structures of the hypothalamo-pituitary axis as well as cells of the ependyma, subcomissural organ and choroid plexus of the lateral and third brain ventricles are immunoreactive to anti-dynorphin IgG only in the LD. This might indicate a seasonal regulatory role of DYN A1?17 in physiological adaptations to severe climate changes.
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