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Related Concept Videos

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,...
Hemoglobin01:24

Hemoglobin

Hemoglobin is a globular protein made up of four subunits. Two of these subunits are alpha chains, and the other two are beta chains. Each subunit contains a molecule of heme, which has an iron atom and can bind to oxygen. When an oxygen molecule binds to one heme group, it changes the shape of hemoglobin, making it easier for the other heme groups to bind oxygen as well.
When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...
Regulation of Metabolism01:19

Regulation of Metabolism

Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
Carbon Dioxide Transport in the Blood01:19

Carbon Dioxide Transport in the Blood

Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
Factors Affecting Respiration01:24

Factors Affecting Respiration

Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
Respiration and Gaseous Exchange01:20

Respiration and Gaseous Exchange

The intricate interplay between the cardiovascular and respiratory systems is crucial for efficiently transporting respiratory gases throughout the body. Let us explore the cardiovascular system's multifaceted functions, emphasizing its pivotal role in gas exchange.
Respiration involves the exchange of gases, especially oxygen (O2) and carbon dioxide (CO2), between the alveoli and body cells, a process facilitated by blood circulation. As a result, the cardiovascular system, which involves the...

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Measurement of Heme Synthesis Levels in Mammalian Cells
09:43

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Published on: July 9, 2015

Heme Metabolism-Derived Carbon Monoxide Regulates Skeletal Muscle Function.

Rodrigo W Alves de Souza1, Hyo In Kim1, Paula Ketilly Nascimento Alves1

  • 1Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA.

Journal of Cachexia, Sarcopenia and Muscle
|May 15, 2026
PubMed
Summary

Heme oxygenases (HO-1 and HO-2) play distinct roles in skeletal muscle. Carbon monoxide (CO) therapy can restore muscle function and endurance in HO-deficient states, offering therapeutic potential.

Keywords:
carbon monoxideexercise adaptationheme oxygenasemitochondrial dysfunctionneuromuscular junctionskeletal muscle metabolism

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Published on: October 4, 2024

Area of Science:

  • Muscle Physiology
  • Mitochondrial Biology
  • Neuromuscular Plasticity

Background:

  • Heme oxygenases (HO-1 and HO-2) are critical for skeletal muscle homeostasis, regulating heme degradation and producing carbon monoxide (CO).
  • While HO-1's role in muscle fiber composition and mitochondrial function is known, HO-2's contribution to activity-dependent neuromuscular plasticity is less understood.
  • This study investigates the distinct roles of HO-1 and HO-2 and the potential of CO to ameliorate muscle dysfunction in HO-deficient models.

Purpose of the Study:

  • To elucidate the specific functions of HO-1 and HO-2 in skeletal muscle.
  • To determine the impact of HO deficiency on muscle phenotype, mitochondrial function, and neuromuscular junctions.
  • To evaluate the therapeutic efficacy of exogenous carbon monoxide (CO) in restoring muscle function in HO-deficient mice.

Main Methods:

  • Generation and analysis of Hmox1/2 double-knockout mice alongside single knockouts and wild-type controls.
  • Assessment of endurance capacity via treadmill running, muscle fiber-type distribution, neuromuscular junction morphology, and mitochondrial respiration.
  • Analysis of neuronal firing dynamics and administration of inhaled CO to evaluate its rescue potential.

Main Results:

  • HO-1 deficiency impaired oxidative fibers, mitochondrial respiration, and endurance.
  • HO-2 deficiency was linked to neuromuscular junction remodeling and altered neuronal firing.
  • Carbon monoxide (CO) treatment in double-knockout mice restored fiber type distribution, improved mitochondrial function, and significantly enhanced endurance, mimicking exercise adaptations.

Conclusions:

  • HO-1 and HO-2 exhibit distinct roles in skeletal muscle adaptation and plasticity.
  • HO-1 influences mitochondrial content and muscle plasticity, while HO-2 impacts neuromuscular plasticity and exercise responsiveness.
  • Exogenous CO effectively rescues deficits in HO-deficient muscle, highlighting its therapeutic potential for conditions limiting exercise.