Abstract
Central regulation of energy balance in seasonal mammals such as the Siberian hamster is dependent on the precise integration of short-term satiety information arising from the gastrointestinal tract with long-term signals on the status of available energy reserves (e.g. leptin) and prevailing photoperiod. Within the central nervous system, the brainstem nucleus of the solitary tract (NTS) and the parabrachial nucleus (PBN) are major relay nuclei that transmit information from the gastrointestinal tract to higher forebrain centres. We extended studies on the seasonal programming of the hypothalamus to examine the effect of the photoperiod on neuropeptidergic circuitries of this gut–brain axis. In the NTS and PBN we performed gene expression and immunoreactivity (-ir) studies on selected satiety-related neuropeptides and receptors: alpha-melanocyte stimulating hormone, melanocortin-3 receptor, melanocortin-4 receptor (MC4-R), growth hormone secretagogue-receptor, cocaine- and amphetamine-regulated transcript, preproglucagon (PPG), glucagon-like peptide 1 (GLP-1), cholecystokinin (CCK), peptide YY, galanin, neurotensin, and corticotrophin releasing hormone (CRH). Gene expression of PPG and MC4-R, and -ir of CCK and GLP-1, in the NTS were up-regulated after 14 weeks in long-day photoperiod (16 h light:8 h dark) compared to short-days (8 h light:16 h dark), whereas CRH-ir and NT-ir were increased in short-days within the PBN. We suggest that brainstem neuroendocrine mechanisms contribute to the long-term regulation of body mass in the Siberian hamster by a photoperiod-related modulation of satiety signalling.
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Abbreviations
- α-MSH:
-
Alpha-melanocyte stimulating hormone
- AgRP:
-
Agouti-related peptide
- CART:
-
Cocaine- and amphetamine-regulated transcript
- CCK:
-
Cholecystokinin
- CNS:
-
Central nervous system
- CRH:
-
Corticotrophin releasing hormone
- GAL:
-
Galanin
- GHS-R:
-
Growth hormone secretagogue-receptor
- GLP:
-
Glucagon-like peptide
- i.c.v.:
-
Intracerebroventricular
- -ir:
-
Immunoreactivity
- LD:
-
Long day
- MCR:
-
Melanocortin receptor
- NPY:
-
Neuropeptide Y
- NT:
-
Neurotensin
- NTS:
-
Nucleus of the solitary tract
- PBN:
-
Parabrachial nucleus
- POMC:
-
Pro-opiomelanocortin
- PPG:
-
Preproglucagon
- PYY:
-
Peptide YY
- SCN:
-
Suprachiasmatic nucleus
- SD:
-
Short day
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Acknowledgments
We thank Sigrid Stöhr for her excellent technical assistance. All described procedures were in accordance with German animal welfare regulations, or were licensed under the UK Home Office Animals (Scientific Procedures) Act, 1986, and had local ethical approval. M. Helwig was recipient of a fellowship funded by the European Commission to attend the ObeSechool European Union Marie Curie Training Site at the Rowett Research Institute. This collaborative study was also funded by the Scottish Government (to J. G. Mercer), EC FP6 funding (‘DIABESITY’ contract no. LSHM-CT-2003-503041 to J. G. Mercer), Deutsche Forschungsgemeinschaft (German Research Foundation KL973/5; to M. Klingenspor) and the National Genome Research Network (NGFN2 01GS0483, NGFNplus 01GS0822; to M. Klingenspor).
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Helwig, M., Archer, Z.A., Heldmaier, G. et al. Photoperiodic regulation of satiety mediating neuropeptides in the brainstem of the seasonal Siberian hamster (Phodopus sungorus). J Comp Physiol A 195, 631–642 (2009). https://doi.org/10.1007/s00359-009-0438-3
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DOI: https://doi.org/10.1007/s00359-009-0438-3