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Related Concept Videos

Sympathetic Activation01:17

Sympathetic Activation

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The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
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Sympathetic Signaling01:32

Sympathetic Signaling

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Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
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Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla01:28

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The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
Collateral Ganglia
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Regulation of Food Intake01:30

Regulation of Food Intake

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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Neural Regulation of Blood Pressure01:18

Neural Regulation of Blood Pressure

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The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
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Related Experiment Video

Updated: Jun 3, 2025

A Novel In Vitro Live-imaging Assay of Astrocyte-mediated Phagocytosis Using pH Indicator-conjugated Synaptosomes
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A Novel In Vitro Live-imaging Assay of Astrocyte-mediated Phagocytosis Using pH Indicator-conjugated Synaptosomes

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Astrocyte Loss Augments Body Weight Through Reduction in Adipose Sympathetic Outflows.

Dan Chen1, Yale Y Yang2, Yunlei Yang1,3,4,5

  • 1Department of Medicine Division of Endocrinology, Albert Einstein College of Medicine, Bronx, New York, USA.

Glia
|January 9, 2025
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Summary

Astrocytes are crucial for preventing obesity by regulating body weight. Loss of astrocytes in the hypothalamus increases body weight, highlighting their role in energy homeostasis.

Keywords:
adipose tissueastrocytebody weightsympathetic outflow

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Area of Science:

  • Neuroscience
  • Metabolic Research
  • Endocrinology

Background:

  • Astrocytes play a role in energy metabolism and homeostasis.
  • The specific role of astrocytes in body weight regulation remains unclear.

Purpose of the Study:

  • To investigate the physiological role of astrocytes in the arcuate nucleus of the hypothalamus (ARH) in controlling body weight.
  • To elucidate the mechanisms by which astrocytes regulate body weight.

Main Methods:

  • Utilized viral vector-assisted, brain-region selective loss of astrocytes in adult mice.
  • Administered chow or high-fat diet to assess body weight changes.
  • Measured adipose tissue norepinephrine (NE) content.
  • Employed chemogenetic stimulation of adipose tissue sympathetic inputs.

Main Results:

  • Selective loss of astrocytes in the ARH significantly increased body weight in mice on both chow and high-fat diets.
  • Astrocyte loss led to reduced norepinephrine content in adipose tissue.
  • Stimulating sympathetic nervous system inputs to adipose tissue reversed the weight gain caused by astrocyte loss.

Conclusions:

  • Astrocytes are essential for preventing diet-induced obesity.
  • Astrocytes modulate body weight by influencing sympathetic outflows to adipose tissues, thereby affecting lipid metabolism.