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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
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Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine
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Optical Approaches for Interrogating Neural Circuits Controlling Hormone Secretion.

Su Young Han1, Jenny Clarkson1, Richard Piet1

  • 1Centre for Neuroendocrinology and Department of Physiology, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand.

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|October 11, 2018
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Optogenetics and GCaMP calcium imaging are revolutionizing how scientists study brain circuits controlling hormone secretion. These advanced optical tools offer powerful methods for investigating neural networks in both brain slices and live animals.

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Area of Science:

  • Neuroscience
  • Neuroendocrinology
  • Optical Imaging

Background:

  • Optical imaging and optogenetics are advancing the study of neuronal networks.
  • The neuroendocrine field increasingly uses these tools to explore hormone secretion control.
  • Genetic mouse models are crucial for these investigations.

Purpose of the Study:

  • To review the benefits and limitations of optical imaging and optogenetics in neuroendocrine research.
  • To discuss applications in acute brain slice and in vivo functional studies.
  • To address key considerations for implementing these techniques.

Main Methods:

  • Utilizing channelrhodopsin, archaerhodopsin, and halorhodopsin for optogenetic manipulation.
  • Employing GCaMP calcium imaging for single-cell (in vitro) and population (in vivo) activity monitoring.
  • Comparing genetic versus viral delivery methods for protein expression in Cre-expressing cells.

Main Results:

  • Optogenetics and GCaMP imaging provide effective means to dissect functional neural circuitry.
  • These methods are valuable for studying hormone secretion control.
  • Considerations include delivery methods, quantification, and animal model states (conscious vs. anesthetized).

Conclusions:

  • Optogenetics and GCaMP imaging are powerful tools for understanding brain circuitry.
  • These techniques are essential for deciphering neural networks controlling hormone secretion.
  • Continued development and application will drive neuroendocrine research forward.