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Myogenic muscle refers to the formation of skeletal muscle tissue, particularly during embryonic development. This process, known as myogenesis, involves the fusion of precursor myoblasts into multinucleated fibers called myotubes. Myogenesis is highly complex and requires tight regulation to ensure the resulting muscle is functional and integrated with other organs. It is influenced by various genetic factors, such as PAX3, c-Met, Mox2, and Myf5, which play critical roles in the development and regeneration of skeletal muscle. Myogenic mechanisms are also observed in the vasculature, where arteries and arterioles react to changes in blood pressure to maintain constant blood flow. This response involves the opening of ion channels, leading to muscle contraction and contributing to the regulation of organ blood flow and peripheral resistance.
| Characteristics | Values |
|---|---|
| Definition | Taking place or functioning in an ordered rhythmic fashion because of the inherent properties of cardiac muscle rather than specific neural stimuli |
| Myogenesis | Formation of skeletal muscular tissue, particularly during embryonic development |
| Muscle fibre formation | Fusion of precursor myoblasts into multinucleated fibres called myotubes |
| Myoblasts | Can either proliferate or differentiate into a myotube |
| Myoblast proliferation | Occurs when enough fibroblast growth factor (FGF) or another growth factor is present in the medium surrounding the cells |
| Myoblast differentiation | Proceeds in stages, the first stage involves cell cycle exit and the commencement of expression of certain genes, the second stage involves the alignment of the myoblasts with one another |
| Genes and proteins expressed during myogenesis | Myocyte enhancer factors, myogenic regulatory factors, serum response factor, skeletal alpha-actin, PAX3, c-Met, Mox2, MSX1, Six, Myf5, and MyoD |
| Role of LBX1 | Development and organisation of muscles in the dorsal forelimb, movement of dorsal muscles into the limb following delamination |
| Role of c-Met | Required for the survival and proliferation of migrating myoblasts, plays a role in delamination, proliferation, and migration |
| Role of Mox2 | Important for the proliferation of myogenic precursors, abnormal patterning of limb muscles without Mox2 |
| Role of Myf5 | Required for proper myoblast proliferation, earliest expressed regulatory factor gene in myogenesis |
| Role of MyoD | Promotes the regenerative ability of satellite cells |
| Myogenic mechanism | How arteries and arterioles react to changes in blood pressure to keep blood flow constant within the blood vessel |
| Myogenic response | Contraction initiated by the myocyte itself, rather than an outside occurrence or stimulus such as nerve innervation |
| Bayliss effect | Special manifestation of the myogenic tone in the vasculature, observed in vascular smooth muscle cells in response to stretch |
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What You'll Learn
- Myogenesis is the formation of skeletal muscle tissue during embryonic development
- The process of myogenesis is highly complex and multi-step
- Myogenic mechanisms are how arteries and arterioles react to changes in blood pressure
- Myogenic muscles can react to stretch, increasing blood pressure and causing contraction
- Myogenic precursor cells can be inherited and defined by the mitochondrial complex I-encoding protein
Myogenesis is the formation of skeletal muscle tissue during embryonic development
Myogenesis is the formation of skeletal muscle tissue, particularly during embryonic development. It is a highly complex process that needs to be tightly regulated during development and regeneration, to ensure that the newly formed skeletal muscle is fully functional and integrated with the rest of the organs. Myogenesis is a multistep process that refers to the formation and development of muscular tissue from undifferentiated cells.
During early embryogenesis, one of the three germ cell layers of the embryo, the 'mesoderm' or the middle layer, segments into somites. The upper layer of each somite breaks down into myotomes and starts releasing muscular progenitor cells (MPCs). At the beginning of fetal myogenesis, MPCs residing in the myotome start expressing Pax3/7, which gives rise to muscle precursors cells or ‘embryonic myoblasts’. Thereafter, the latter will differentiate into myocytes, which start fusing in response to fibroblast growth factor (FGF) to form primary myotubes.
Myogenesis depends on the activation of satellite cells that have the potential to differentiate into new fibres. MyoD and Myf5 enable the differentiation of myogenic progenitors into myoblasts, followed by myogenin, which differentiates the myoblast into myotubes. MRF4 is important for blocking the transcription of muscle-specific promoters, enabling skeletal muscle progenitors to grow and proliferate before differentiating.
During embryonic myogenesis, mesoderm-derived structures generate the first muscle fibres of the body proper, and in subsequent waves, additional fibres are generated along these template fibres. In the poorly understood perinatal phase, muscle resident myogenic progenitors initially proliferate extensively but later decrease as the number of myonuclei reaches a steady state and myofibrillar protein synthesis peaks. Once the muscle has matured, these progenitors will enter quiescence and henceforth reside within it as satellite cells.
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The process of myogenesis is highly complex and multi-step
Myogenesis is a complex and multistep process that involves the formation and development of skeletal muscular tissue from undifferentiated cells. This process is highly regulated by multiple factors, including MyoD, Myf5, Myogenin, and MRF-4, which play critical roles in muscle development.
During early embryogenesis, the embryo's middle layer, or mesoderm, segments into somites. The upper layer of each somite then breaks down into myotomes, releasing muscular progenitor cells (MPCs). These MPCs express Pax3/7, which gives rise to muscle precursor cells, or embryonic myoblasts. Myoblasts are committed muscle cell precursors that can either proliferate or differentiate into myotubes, which are multinucleated fibers. The choice between proliferation and differentiation is influenced by factors such as the presence of growth factors in the surrounding medium.
The differentiation of myoblasts into myotubes occurs in stages. The first stage involves the exit from the cell cycle and the expression of specific genes. In the second stage, the myoblasts align with each other, and when they leave the cell cycle, they fuse together to form multinucleated myotubes. This fusion is facilitated by myogenic bHLH proteins, which are produced by the myotome cells.
In the context of prenatal and postnatal myogenesis, the cellular transcriptome undergoes profound changes to express the genes required for various functions, such as alertness to muscle damage, proliferation, and contraction. These gene expression changes are orchestrated by a complex transcriptional regulatory network, and disruptions in this network can lead to muscular defects. For example, mutations in the PAX3 gene can cause a failure in c-Met expression, resulting in impaired lateral migration and abnormal muscle development.
Overall, the process of myogenesis is intricate and involves multiple stages, genetic factors, and regulatory mechanisms. It is a highly conserved process that results in the formation of contracting muscles, ensuring the functionality and integration of skeletal muscle with other organs during development and regeneration.
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Myogenic mechanisms are how arteries and arterioles react to changes in blood pressure
Arteries carry blood away from the heart and can be divided into large and small arteries. Large arteries receive the highest blood flow pressure and are thicker and more elastic to accommodate high pressures. Smaller arteries, such as arterioles, have more smooth muscle, which contracts or relaxes to regulate blood flow to specific body parts. Arterioles experience less blood pressure, so they do not need to be as elastic.
When there is an increase in blood flow, the vascular smooth muscle is stretched. This causes the artery to constrict, decreasing its radius, which, in turn, increases resistance and pressure while decreasing flow. On the other hand, when there is a decrease in blood flow, there is decreased stretching of the smooth muscle, leading to its relaxation and arteriole dilation, which decreases resistance and increases flow. This is known as the myogenic theory of autoregulation, which is how an organ or tissue maintains blood flow despite changes in perfusion pressure.
Arterioles account for most of the resistance in the pulmonary circulation because they are more rigid than larger arteries. A slight increase or decrease in the diameter of an artery or arteriole causes a dramatic decrease or increase in resistance, respectively, due to the inverse relationship between resistance and the radius of the blood vessel. This relationship is described mathematically by the Poiseuille equation, which relates cardiac output, mean arterial pressure, right atrial pressure, and total peripheral resistance.
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Myogenic muscles can react to stretch, increasing blood pressure and causing contraction
Myogenic muscles are those that can react to stretch, increasing blood pressure and causing contraction. This mechanism is known as the Bayliss effect or Bayliss myogenic response, and it is a special manifestation of the myogenic tone in the vasculature. When blood pressure increases in blood vessels, they distend and react by constricting. This response is particularly relevant in the arterioles of the body.
The stretch of the muscle membrane opens stretch-activated ion channels, which cause the cells to become depolarized. This results in a Ca2+ signal and triggers muscle contraction. The level of contraction is directly proportional to the level of calcium that enters the cell. This contraction increases the total peripheral resistance (TPR), which further increases the mean arterial pressure (MAP).
The myogenic mechanism is a way for arteries and arterioles to react to changing blood pressure to maintain a constant blood flow within the blood vessel. This 'basal' myogenic tone is useful in regulating organ blood flow and peripheral resistance. The smooth muscle of the blood vessels reacts to stretching by opening ion channels, causing depolarization and muscle contraction. This contraction reduces the volume of blood that can pass through the lumen, reducing blood flow.
Conversely, when the smooth muscle in the blood vessel relaxes, the ion channels close, resulting in vasodilation and increased blood flow through the lumen. This mechanism is particularly important in the kidneys, where the glomerular filtration rate is very sensitive to changes in blood pressure. The myogenic mechanism helps to maintain a constant renal blood flow, even when arterial pressure varies.
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Myogenic precursor cells can be inherited and defined by the mitochondrial complex I-encoding protein
Myogenesis is a complex process that involves the formation and development of muscular tissue from undifferentiated cells. This process is highly regulated by multiple factors, including genetic factors such as PAX3, c-Met, Mox2, and Myf5. During embryogenesis, the mesoderm layer of the embryo segments into somites, which then release muscular progenitor cells (MPCs). These MPCs differentiate into muscle precursor cells or embryonic myoblasts, which further develop into myocytes and eventually form skeletal muscle fibres.
Myogenic precursor cells, also known as muscle progenitor cells or myoblasts, play a crucial role in myogenesis. These cells have the ability to self-renew and differentiate into specialised muscle cells. It has been found that myoblasts derived from slow-type enriched soleus (SOL) have a higher potential for self-renewal compared to those derived from fast-type enriched tibialis anterior (TA). This suggests that the functionality of myogenic cells may be dependent on the region of the muscles they originate from rather than the specific muscle fibre type.
The inherited myogenic abilities of these precursor cells have been linked to the expression of a specific mitochondrial complex I-encoding protein, NADH dehydrogenase (ubiquinone) iron-sulfur protein 8 (Ndufs8). Proteomic analysis revealed that Ndufs8 was significantly increased in SOL-derived myoblasts compared to TA-derived myoblasts. Furthermore, gain- and loss-of-function experiments showed that Ndufs8 expression modulated myogenic differentiation, apoptosis, and metabolism in these cells.
The expression of Ndufs8 was found to be regulated by the NAD/NADH ratio, which is influenced by the Sirtuin (Sirt)-p53 signaling cascade. Additionally, supplementation of NAD+ was shown to enhance the self-renewal potential of myogenic precursor cells. These findings highlight the functional differences between SOL and TA-derived myoblasts and provide insights into the role of mitochondrial complex I in defining the inherited myogenic abilities of these cells.
Understanding the molecular mechanisms underlying the inherited myogenic abilities of precursor cells is crucial for developing therapeutic approaches, such as cell transplantation therapy. By studying the diversity of myoblasts and their ability to form myofibers and satellite cells, researchers can identify potential cell sources for regenerative medicine. Additionally, the role of mitochondrial function and oxidative stress in maintaining myogenic potential with aging is an area of ongoing investigation.
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Frequently asked questions
Myogenic refers to the formation of muscle tissue. It is a highly complex process that needs to be tightly regulated during development and regeneration, to ensure that the newly formed skeletal muscle is fully functional and integrated with the rest of the organs.
The myogenic mechanism is how arteries and arterioles react to an increase or decrease in blood pressure to maintain a constant blood flow within the blood vessel.
The Bayliss effect or Bayliss myogenic response is a special manifestation of the myogenic tone in the vasculature. It is a response to stretch, particularly in the arterioles of the body. When blood pressure increases and the blood vessels distend, they react with a constriction.
