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In ovo Electroporation in Chick Midbrain for Studying Gene Function in Dopaminergic Neuron Development
Published on: August 3, 2012
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Melanin-concentrating hormone (MCH) neurons in the developing chick brain
SiHan Li1, Alissa Yip1, Jaimie Bird1
1Department of Psychology, McGill University, Montreal, QC H3A 1B1, Canada.
Brain Research
|November 14, 2018
Summary
This study details the development of melanin-concentrating hormone (MCH) neurons in chicken embryos, revealing their origin and distinct developmental timing compared to rodents. MCH neurons appear later than hypocretin/orexin neurons in chickens.
Area of Science:
- Neuroscience
- Developmental Biology
- Avian Research
Background:
- Melanin-concentrating hormone (MCH) neurons are crucial for regulating various physiological functions.
- No prior developmental studies on MCH neurons in avian species existed.
- Understanding MCH neuron development in birds offers comparative insights into brain evolution.
Purpose of the Study:
- To investigate the developmental timeline and anatomical distribution of MCH neurons in chicken embryos.
- To compare the developmental patterns of MCH neurons with hypocretin/orexin (H/O) neurons in chickens.
- To identify the potential origin of MCH neurons within the developing avian brain.
Main Methods:
- Validated a commercial antibody for chicken MCH neuron detection.
- Employed immunohistochemistry to identify and quantify MCH neurons during embryonic development (E8-E20).
- Mapped the distribution of MCH-positive cell bodies and fibers in the chicken brain.
Main Results:
- MCH neurons were first detected around embryonic day 8 in the posterior hypothalamus, increasing by E20.
- MCH neuron development in chickens occurred later than H/O neurons, contrasting with rodent studies.
- MCH neurons originated from hypothalamic periventricular organ territories, partially overlapping with serotonergic neuron sources.
- MCH fibers innervated key brain areas, mirroring rodent patterns by late embryonic stages.
Conclusions:
- Chicken MCH neurons exhibit a unique developmental trajectory compared to rodents.
- Despite developmental differences, mature MCH neurons in chickens share phenotypic similarities with those in rodents.
- These findings suggest potentially divergent roles for MCH during avian and mammalian embryonic development.
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