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Conditional Genetic Transsynaptic Tracing in the Embryonic Mouse Brain
Published on: December 22, 2014
Characterization of Kiss1 neurons using transgenic mouse models
R M Cravo1, L O Margatho, S Osborne-Lawrence
1Department of Internal Medicine, Division of Hypothalamic Research, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard Dallas, TX, USA.
Neuroscience
|November 25, 2010
Summary
Kisspeptin (Kiss1) neurons in the brain are crucial for fertility. New transgenic mice reveal distinct roles for Kiss1 neurons in the hypothalamus, influencing reproduction and metabolism.
Area of Science:
- Neuroendocrinology
- Reproductive Biology
- Metabolic Regulation
Background:
- Loss-of-function mutations in kisspeptin (Kiss1) or kisspeptin receptor (Kiss1r) genes cause infertility due to hypogonadotropic hypogonadism.
- Kiss1 mRNA is primarily found in the hypothalamus, specifically the anteroventral periventricular nucleus (AVPV) and arcuate nucleus (Arc).
Purpose of the Study:
- To generate and characterize Kiss1-Cre transgenic mice for studying distinct kisspeptin cell populations.
- To investigate the neuroanatomical distribution and functional characteristics of Kiss1 neurons.
Main Methods:
- Generation of Kiss1-Cre transgenic mice.
- Assessment of Cre activity using Cre-dependent reporter gene expression (GFP, β-galactosidase).
- Neuroanatomical analysis of Kiss1 expression and co-localization with neurotransmitters and receptors.
Main Results:
- Established a Kiss1-Cre mouse line (J2-4) with specific Cre activity in Kiss1 neurons.
- Identified Kiss1 expression in the cerebral cortex, amygdala, and preoptic nucleus.
- Demonstrated differential leptin responsiveness and neurotransmitter co-expression (glutamatergic, GABAergic) in Arc and AVPV Kiss1 neurons.
- Showed innervation of Kiss1 neurons by melanocortin fibers and expression of melanocortin receptor 4 (MC4R) in subsets of these neurons.
Conclusions:
- Kisspeptin neurons exhibit distinct anatomical locations and functional properties, suggesting specialized roles in reproduction and metabolism.
- The Kiss1-Cre mouse line provides a valuable tool for dissecting the complex functions of kisspeptin signaling in the central nervous system.
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