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Related Concept Videos

Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers

Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
Effect of Hepatic Disease on Pharmacokinetics: Drug Dosing and Hepatic Blood Flow01:26

Effect of Hepatic Disease on Pharmacokinetics: Drug Dosing and Hepatic Blood Flow

Chronic liver disease significantly impacts drug metabolism due to alterations in hepatic blood flow and enzyme accessibility. This disruption affects the body's pharmacokinetics—the movement and processing of drugs within the system. Key enzymes crucial for metabolizing medications become less accessible, changing how drugs are processed and utilized. Furthermore, liver disease influences the synthesis of plasma proteins, such as albumin and globulins, which play critical roles in drug binding...
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...

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Related Experiment Videos

Hyperhomocysteinemia decreases bone blood flow.

Neetu Tyagi1, Thomas P Vacek, John T Fleming

  • 1Department of Physiology and Biophysics, School of Medicine, University of Louisville, KY, USA. n0tyag01@louisville.edu

Vascular Health and Risk Management
|February 23, 2011
PubMed
Summary

High homocysteine (Hcy) levels, or hyperhomocysteinemia, reduce bone blood flow and compromise bone strength. This study demonstrates Hcy

Keywords:
bone densityhomocysteinetibia

Related Experiment Videos

Area of Science:

  • Biomedical Science
  • Bone Biology
  • Metabolic Disease

Background:

  • Elevated plasma homocysteine (Hcy), termed hyperhomocysteinemia (HHcy), is linked to osteoporosis.
  • Reduced bone blood flow is a potential mechanism for impaired bone mechanical properties.

Purpose of the Study:

  • To investigate the hypothesis that HHcy decreases bone blood flow and biomechanical properties.
  • To determine the effect of Hcy on bone blood flow and related biochemical markers in a rat model.

Main Methods:

  • Male Sprague-Dawley rats were administered Hcy in drinking water for 8 weeks.
  • Measurements included plasma Hcy, vitamin B12, folate, systolic blood pressure, tibial blood flow, and tibial mass.
  • Laser Doppler flowmetry was used to assess tibial blood flow.

Main Results:

  • Hcy-treated rats exhibited significantly higher Hcy levels and lower vitamin B12 levels compared to controls.
  • Tibial blood flow was significantly reduced in Hcy-treated rats (0.51 ± 0.09 flow units) versus controls (0.78 ± 0.09 flow units).
  • Tibial mass was reduced in Hcy-treated rats, while bone density remained unchanged.

Conclusions:

  • Hcy significantly reduces bone blood flow in rats.
  • Reduced bone blood flow due to Hcy may contribute to compromised bone biomechanical properties.
  • This suggests a potential mechanism linking HHcy to osteoporosis.