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Related Experiment Video

Updated: Jan 20, 2026

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Two distinct GUCY2C circuits with PMV (hypothalamic) and SN/VTA (midbrain) origin.

D J Merlino1, J R Barton1, B A Charsar2

  • 1Department of Pharmacology and Experimental Therapeutics, Thomas Jefferson University, 1020 Locust Street, 368 JAH, Philadelphia, PA, 19107, USA.

Brain Structure & Function
|September 6, 2019
PubMed
Summary

Guanylyl cyclase C (GUCY2C) in the hypothalamus and midbrain regulates appetite. This study maps GUCY2C neural circuits, revealing distinct pathways involved in satiety and metabolic homeostasis.

Keywords:
Guanylyl cyclase CLeptin receptorObesitySubstantia nigraVentral premammillary nucleusVentral tegmental area

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Molecular Biology

Background:

  • Guanylyl cyclase C (GUCY2C) is a central receptor in the gut-brain axis, regulated by uroguanylin.
  • GUCY2C plays a role in appetite and metabolic homeostasis, with expression in the hypothalamus and ventral midbrain.
  • The precise neuroanatomical organization of GUCY2C in these brain regions and its relation to satiety circuits were unknown.

Purpose of the Study:

  • To elucidate the neuroanatomical distribution and organization of Guanylyl cyclase C (GUCY2C) mRNA and protein in the hypothalamus and midbrain.
  • To identify the specific neuronal populations expressing GUCY2C in these brain areas.
  • To determine the projection patterns of GUCY2C-expressing neurons and their relationship to satiety regulation.

Main Methods:

  • In situ hybridization and immunohistochemistry to detect GUCY2C mRNA and protein.
  • Stereotaxic ablation of specific neuronal populations (PMV, VTA/SN).
  • Anterograde tracing techniques to map axonal projections.

Main Results:

  • Hypothalamic GUCY2C mRNA is localized to the ventral premammillary nucleus (PMV), while midbrain expression is found in the ventral tegmental area (VTA) and substantia nigra (SN).
  • GUCY2C is expressed in leptin receptor-expressing neurons in the PMV and tyrosine hydroxylase-immunoreactive neurons in the VTA/SN.
  • Selective ablation and tracing studies confirmed distinct GUCY2C-expressing neuronal circuits originating from the PMV and VTA/SN, projecting to specific brain areas.

Conclusions:

  • Two discrete neuronal circuits expressing GUCY2C originate in the hypothalamus (PMV) and midbrain (VTA/SN).
  • These circuits project to distinct downstream targets, suggesting separate roles in regulating homeostatic and behavioral aspects of satiety.
  • Findings provide a structural basis for the GUCY2C-uroguanylin gut-brain axis in appetite and metabolic control.