Dominic Stone
Ribosomes are organelles that exist within all cells and are responsible for creating the proteins and molecules that allow bodies to function. Cardiac muscle tissue, or myocardium, is a type of muscle tissue that forms the heart. It contracts and releases involuntarily, keeping the heart pumping blood around the body. Ribosomes are essential for the functioning of cardiac muscle tissue, and a deficiency or mutation in the ribosomal protein RPL3L can lead to impaired cardiac contractility and, consequently, heart disease. Thus, understanding the role of ribosomes in cardiac muscle is crucial for maintaining heart health and potentially developing future treatments.
| Characteristics | Values |
|---|---|
| Do cardiac muscles have ribosomes? | Yes |
| Ribosomal protein | RPL3L |
| RPL3L found in | Heart and skeletal muscle |
| RPL3L function | Influences translation elongation dynamics |
| RPL3L deficiency | Impaired cardiac contractility |
| RPL3L deficiency in humans | Cardiomyopathy and atrial fibrillation |
| RPL3L-containing ribosomes | Less prone to collisions |
| RPL3L-deficient heart | Reduced abundance of proteins related to cardiac muscle contraction |
| RPL3L-ribosomes | Contribute to the regulation of translation elongation dynamics |
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What You'll Learn
Cardiac muscle tissue
Cardiac muscle cells, or cardiomyocytes, are the individual cells that make up the cardiac muscle. These cells are striated, branched, and contain many mitochondria. Each cardiomyocyte contains a single, centrally located nucleus surrounded by a cell membrane known as the sarcolemma. The sarcolemma contains voltage-gated calcium channels, specialized ion channels that skeletal muscle does not possess. The functional unit of cardiomyocyte contraction is the sarcomere, which consists of thick (myosin) and thin (actin) filaments. The interaction between these filaments forms the basis of the sliding filament theory. When a cardiac muscle cell contracts, the myosin filament pulls the actin filaments towards each other, causing the cell to shrink. The cell uses ATP to power this contraction.
Recent studies have also found that a mutation in the ribosomal protein RPL3L, expressed only in heart and skeletal muscle, reduces cardiac contractility in mice. This mutation delays the rate of translating mRNA, leading to ribosomes colliding and causing protein folding abnormalities.
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Ribosomes and polysomes
Ribosomes are found within all cells and are responsible for producing the proteins and molecules that make the body function. DNA is transcribed into messenger RNA, or mRNA, which is then used as a blueprint to link amino acids together and build proteins. Cardiac muscle contains ribosomes, and these have been isolated and studied in rats.
Polyribosomes, also known as polysomes, are mRNAs with multiple ribosomes attached. They are formed during the elongation phase when ribosomes and elongation factors synthesize the encoded polypeptide. Polysomes are created when multiple ribosomes move along the coding region of mRNA. The ability of multiple ribosomes to function on an mRNA molecule explains the limited abundance of mRNA in the cell.
The structure of polysomes can vary, with different structural configurations potentially reflecting a variety in translation of mRNAs. For example, a high number of circular and zigzag polysomes were found after several rounds of translation, and a longer period of translation resulted in the formation of densely packed 3-D helical polysomes. The structure of polysomes can be determined using electron microscopy technologies, such as staining, metal shadowing, and ultra-thin cell sections.
Polysomal profiling is a technique used to measure the level of gene expression and track the translational status of an identified mRNA. It is optimally applied to cultured cells and tissues. The technique has been used in studies to compare the translational status of mRNAs in different cell types, for example, to investigate the effect of the vesicular stomatitis virus in mammalian cells.
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Contraction and release
Cardiac muscle tissue, or myocardium, is a type of muscle tissue that forms the heart. It contracts and releases involuntarily, keeping the heart pumping blood around the body. Cardiac muscle cells contain mitochondria, which convert oxygen and glucose into energy in the form of adenosine triphosphate (ATP). This energy is then used to power the cardiac muscle cell's contraction.
When a cardiac muscle cell contracts, the myosin filament pulls the actin filaments toward each other, causing the cell to shrink. The dark stripes on cardiac muscle tissue viewed under a microscope indicate thick filaments that comprise myosin proteins, while the thin, lighter filaments contain actin.
Cardiac muscle cells are connected by intercalated discs, which contain gap junctions that relay electrical impulses from one cell to another. Desmosomes are another type of structure within intercalated discs that help hold cardiac muscle fibers together.
Recent studies have revealed that ribosomes, which are found within all cells, exhibit structural differences that lead to translation specificity. For example, some ribosomes are better at producing proteins that control metabolism. This concept is known as Ribosome Heterogeneity.
A study on RPL3L-containing ribosomes in male mice found that they contribute to the regulation of translation elongation dynamics, especially at collision-prone sites. RPL3L-ribosomes appear to influence the translation of the overall transcriptome, but they have a more pronounced effect on genes related to cardiac muscle contraction and dilated cardiomyopathy.
A deficiency in the ribosomal protein RPL3L, expressed in heart and skeletal muscle, has been found to impair cardiac contractility due to delayed mRNA translation. This delay causes ribosomes to collide, resulting in misfolded proteins that are cleared out from the cell. The effects of this deficiency are most significant for proteins related to cardiac muscle contraction.
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Heart attacks and myocardial infarction
Cardiac muscle does have ribosomes, and these organelles play a critical role in the heart's ability to toggle between maintenance and energy-boosting modes. A study found that knocking out the RPL3L gene in mice was lethal, while knocking out the RPL3 gene resulted in the creation of ribosomes with RPL3 instead. This suggests that ribosomes with RPL3 may be crucial for the heart's survival. Interestingly, in response to a heart attack or myocardial infarction, cardiomyocytes compensate by replacing their RPL3L-containing ribosomes with those containing RPL3. This mechanism also occurs during cardiac hypertrophy, whether due to physiological or pathological reasons.
Now, moving on to the topic of heart attacks and myocardial infarction, it is essential to understand the underlying causes and symptoms. A heart attack, also known as myocardial infarction, occurs when the blood flow to a part of the heart is blocked or significantly reduced. This can be due to a complete or partial blockage of a coronary artery, which is a blood vessel that supplies blood to the heart. The blockage is often caused by a blood clot or plaque rupture within the artery. This interruption in blood flow can lead to damage or death of heart muscle cells, which is life-threatening and requires immediate medical attention.
The symptoms of a heart attack can vary, ranging from mild to severe, and some people may even experience no symptoms at all. However, the most common symptom is chest pain or discomfort that may feel like squeezing, heaviness, or crushing pain. This pain can radiate to other areas, including the left arm, both arms, shoulder, neck, jaw, back, or waist. Other symptoms include shortness of breath, nausea, sweating, and indigestion-like discomfort. It is important to note that women may experience atypical symptoms, such as brief or sharp pain in the neck, arm, or back, along with shortness of breath, fatigue, and insomnia.
Myocardial infarction, or heart attack, can be classified based on electrocardiogram (ECG) results. An acute complete blockage of a medium or large heart artery is typically classified as ST-elevation myocardial infarction (STEMI). On the other hand, a partial blockage often leads to a non-ST elevation myocardial infarction (NSTEMI). However, it is important to note that some individuals with NSTEMI may still experience a total blockage.
The treatment and management of heart attacks are crucial to prevent permanent heart damage or death. Prompt medical attention is necessary, and calling emergency services is imperative. Time is of the essence, as a delay of just a few minutes can have severe consequences. Treatment focuses on restoring blood flow to the heart as quickly as possible to prevent further damage.
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RPL3L-containing ribosomes
Ribosomes are macromolecular machines responsible for protein synthesis in all living beings. Historically, ribosomes have been perceived as static and passive elements that do not partake in regulatory processes. However, recent studies have revealed the existence of differences in ribosome organization and post-translational modifications, leading to the proposal of concepts such as "ribosome heterogeneity" and a "ribosome code".
Research has shown that a mutation in the ribosomal protein RPL3L, expressed only in heart and skeletal muscle, reduces cardiac contractility in mice. This mutation delays the rate of translating mRNA, causing ribosomes to collide and leading to protein folding abnormalities. The abnormal proteins are then targeted and degraded by the cell's quality control system. The deficiency in the RPL3L ribosomal protein alters translation dynamics for the entire tissue, but its effects are most significant for proteins related to cardiac muscle contraction.
The existence of RPL3L-containing ribosomes also provides insight into the heart's ability to toggle between maintenance and energy-boost modes. When RPL3L is knocked out, a rescue mechanism occurs, with RPL3 becoming up-regulated and resulting in the formation of RPL3-containing ribosomes instead. This replacement mechanism is observed in response to a heart attack or myocardial infarction, as well as during cardiac hypertrophy. The different shape of the new ribosomes enables them to interact more closely with mitochondria, leading to a significant boost in ATP production and energy levels.
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Frequently asked questions
Ribosomes are structures within a cell that have multiple roles. They are responsible for creating proteins and molecules that make the body function.
Yes, cardiac muscle does have ribosomes. Cardiac ribosomes have been found to have a lower rate of incorporation of amino acids in vitro than liver ribosomes.
Ribosomes in cardiac muscle are responsible for producing proteins that are involved in cardiac muscle contraction. They also play a role in the regulation of translation elongation dynamics, particularly at Ala/Pro codons and collision-prone sites.
A mutation in the ribosomal protein of cardiac muscle can lead to impaired cardiac contractility. This is caused by a delay in the translation of mRNA, resulting in ribosomal collisions and protein folding abnormalities.
