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Related Concept Videos

Hypoglycemia and Glucagon01:15

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Without prolonged fasting, healthy individuals maintain blood glucose levels above 3.5 mM due to a well-adapted neuroendocrine counterregulatory system that effectively prevents acute hypoglycemia, a potentially life-threatening condition. The primary clinical scenarios for hypoglycemia encompass diabetes treatment, inappropriate production of endogenous insulin or insulin-like substances by tumors, and the use of glucose-lowering agents in non-diabetic individuals. Notably, hypoglycemia in the...
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Hypoglycemia is a blood glucose level below 70 mg/dL. It commonly occurs in individuals using insulin or insulin-secreting drugs, but may also arise in non-diabetic conditions. People with type 1 diabetes are at the highest risk because they depend on exogenous insulin. People with type 2 diabetes are also at risk, especially when treated with insulin or medications such as sulfonylureas, which increase insulin release regardless of blood glucose levels. It develops when insulin levels exceed...
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Hyperglycemia01:29

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Hyperglycemia is an abnormally high blood glucose level. It is diagnosed by fasting glucose ≥126 mg/dL, 2-hour oral glucose tolerance test (or OGTT) ≥200 mg/dL, random glucose ≥200 mg/dL with symptoms, or HbA1c ≥6.5%. However, HbA1c results may be unreliable in certain conditions, such as anemia or hemoglobinopathies, and the diagnosis should be confirmed unless classic symptoms are present. Postprandial hyperglycemia is typically considered significant when glucose...
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Glucose Homeostasis: Regulation of Blood Glucose01:02

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Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
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Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
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Type II Diabetes Mellitus III: Clinical Manifestations and Diagnosis01:25

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Type 2 diabetes mellitus develops gradually and is often asymptomatic in early stages.Clinical ManifestationsWhen symptoms appear, they include fatigue, blurred vision, pruritus, delayed wound healing, and recurrent infections, particularly candidal infections. Peripheral neuropathy may present as numbness or tingling in the extremities. Classic hyperglycemia symptoms—polyuria, polydipsia, and polyphagia—are less common. Most patients are overweight and frequently have associated...
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Updated: Apr 24, 2026

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Peripheral and central glucose sensing in hypoglycemic detection.

Casey M Donovan1, Alan G Watts2

  • 1Department of Biological Sciences, The Center for NeuroMetabolic Interactions, USC Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, California Donovan@usc.edu.

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Summary

Low blood sugar (hypoglycemia) damages the brain. Glucose sensors in the body and brain trigger counterregulatory responses to restore normal glucose levels, protecting brain function.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Metabolic regulation

Background:

  • Hypoglycemia, or low blood glucose, is a critical threat to brain function due to the brain's high glucose dependency.
  • The body employs a complex system of glucose sensors to detect and counteract hypoglycemia, maintaining blood glucose homeostasis.
  • Counterregulatory responses are vital for preventing the detrimental effects of hypoglycemia on the central nervous system.

Purpose of the Study:

  • To review the diverse glucose sensory systems involved in detecting hypoglycemia.
  • To highlight the specific roles of peripheral glucose sensors in initiating counterregulatory responses.
  • To provide a comprehensive overview of hypoglycemic detection and the subsequent restoration of euglycemia.

Main Methods:

  • Literature review of studies on glucose sensing mechanisms.
  • Analysis of research focusing on central and peripheral glucose detection.
  • Examination of physiological responses to experimentally induced hypoglycemia.

Main Results:

  • Multiple glucose-sensing regions exist in both the brain and the periphery.
  • Peripheral glucose sensors play a significant role in detecting hypoglycemia and activating counterregulatory pathways.
  • These sensory inputs collectively orchestrate responses to restore blood glucose levels.

Conclusions:

  • The brain's vulnerability to hypoglycemia necessitates sophisticated detection and counterregulatory mechanisms.
  • Peripheral glucose sensing is a crucial component of the body's defense against low blood glucose.
  • Understanding these systems is key to managing metabolic disorders and protecting brain health.