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GHS-R1a signaling in the DMH and VMH contributes to food anticipatory activity

International Journal of Obesity volume 38, pages 610–618 (2014)Cite this article

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Abstract

Background:

Rats that have restricted access to food at a fixed time point of the circadian phase display high levels of food anticipatory activity (FAA). The orexigenic hormone ghrelin has been implicated in the regulation of FAA. However, it is not known via which brain area ghrelin exerts this effect. Growth hormone secretagogue receptor 1a (GHS-R1a) is highly expressed in the hypothalamus, including the dorsomedial hypothalamus (DMH) and the ventromedial hypothalamus (VMH). These two hypothalamic areas have been reported to play a role in FAA.

Aim of the study:

To examine the role of GHS-R1a signaling in the DMH and VMH in FAA.

Design:

Adeno-associated virus expressing a shRNA directed against GHS-R1a was used to establish local knockdown of GHS-R1a in the DMH and VMH in rats. Rats were subsequently subjected to a restricted feeding schedule (RFS).

Results:

Under ad libitum conditions, knockdown of GHS-R1a in the VMH increased food intake and body weight gain. In addition, GHS-R1a knockdown in VMH and DMH reduced body temperature and running wheel activity (RWA). When rats were subjected to a RFS, the main effect of GHS-R1a knockdown in both DMH and VMH was a decrease in RWA and an attenuation of body weight loss. Rats with knockdown of GHS-R1a in DMH and VMH showed a delay in onset of FAA. In addition, GHS-R1a knockdown in DMH resulted in a reduction of FAA amplitude.

Conclusion:

This is the first study to investigate the effect of local hypothalamic knockdown of GHS-R1a on FAA. Our results implicate hypothalamic GHS-R1a signaling in the regulation of FAA. Nevertheless, some FAA remained, suggesting that a distributed network of brain areas and signaling pathways is involved in the development of FAA.

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Acknowledgements

The research was supported by NWO Toptalent and the EU (FP7-KBBE-2009-3-245009 (Neurofast) and FP7-KBBE-2010-4-266408 (Full4Health).

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Authors and Affiliations

  1. Department of Neuroscience and Pharmacology, Rudolf Magnus Institute of Neuroscience, University Medical Center Utrecht, Utrecht, The Netherlands

    M Merkestein, M A van Gestel, E M van der Zwaal, M A Brans, M C Luijendijk, A J van Rozen, J Hendriks, K M Garner, A J Boender, R Pandit & R Adan

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  1. M Merkestein
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Correspondence to R Adan.

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Merkestein, M., van Gestel, M., van der Zwaal, E. et al. GHS-R1a signaling in the DMH and VMH contributes to food anticipatory activity. Int J Obes 38, 610–618 (2014). https://doi.org/10.1038/ijo.2013.131

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