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Related Concept Videos

Glucose Homeostasis: Regulation of Blood Glucose01:02

Glucose Homeostasis: Regulation of Blood Glucose

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.
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...
Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
In addition to accelerating glucose uptake and utilization, insulin has...
Hyperglycemia01:29

Hyperglycemia

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 levels exceed 180 mg/dL two...
Vascular Resistance01:20

Vascular Resistance

Vascular resistance is a critical concept in understanding blood flow dynamics in the circulatory system. It refers to the resistance that blood encounters as it flows through the blood vessels. This resistance is a key factor in determining blood pressure and cardiac workload.
The primary determinants of vascular resistance are vessel diameter, blood viscosity, and vessel length. Among these, vessel diameter plays the most significant role due to the fourth power relationship described by...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Glucose Absorption Into the Small Intestine01:26

Glucose Absorption Into the Small Intestine

Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and 'exit' via the...

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Related Experiment Video

Updated: Jul 10, 2026

Combined Intravital Microscopy and Contrast-enhanced Ultrasonography of the Mouse Hindlimb to Study Insulin-induced Vasodilation and Muscle Perfusion
08:22

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Vascular reactivity changes in glucose-intolerant rat.

Worku Abebe1, Mahmood S Mozaffari

  • 1Department of Oral Biology and Maxillofacial Pathology School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1128, USA. wabebe@mail.mcg.edu

Journal of Cardiovascular Pharmacology
|November 22, 2007
PubMed
Summary

Glucose intolerance in neonatal streptozotocin-treated (nSTZ) rats increases vascular reactivity over time. These vascular changes during prediabetes may contribute to cardiovascular complications.

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Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues
08:41

Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues

Published on: June 3, 2019

Area of Science:

  • Vascular Biology
  • Metabolic Disorders
  • Cardiovascular Physiology

Background:

  • Glucose intolerance is a precursor to type 2 diabetes and cardiovascular disease.
  • Early vascular dysfunction in prediabetes remains incompletely understood.
  • Neonatal streptozotocin-treated (nSTZ) rats model glucose intolerance.

Purpose of the Study:

  • To investigate the vascular effects of glucose intolerance in the nSTZ rat model.
  • To assess aortic reactivity at different time points post-STZ administration.
  • To identify potential mechanisms underlying vascular alterations.

Main Methods:

  • Neonatal streptozotocin (STZ) administration to induce glucose intolerance in rats.
  • In vitro assessment of aortic reactivity to vasoactive agents (norepinephrine, acetylcholine, serotonin).
  • Evaluation of vascular responses in endothelium-denuded aortas and in calcium-free conditions.
  • Pharmacological inhibition using calphostin C to probe signaling pathways.

Main Results:

  • nSTZ rats exhibited elevated blood glucose levels.
  • At 6 months, nSTZ rat aortas showed enhanced contractile responses to norepinephrine and serotonin.
  • Endothelium-mediated relaxation to acetylcholine was augmented, linked to nitric oxide (NO) release.
  • Enhanced vascular reactivity was associated with protein kinase C (PKC) activation, as indicated by calphostin C's effects.

Conclusions:

  • Prolonged glucose intolerance significantly increases vascular reactivity to agonists.
  • Vascular alterations observed in the prediabetes stage may predispose to cardiovascular complications.
  • Further research is warranted to elucidate the long-term cardiovascular implications of prediabetic vascular changes.