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Related Concept Videos

Functions of Smooth Muscles01:23

Functions of Smooth Muscles

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Smooth muscles are an important type of muscle tissue that plays a vital role in the involuntary movements of internal organs. For example, they help regulate the movement of food through the gut and the flow of blood through the circulatory system.
Function of visceral smooth muscles
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Smooth Muscle Contraction01:25

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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
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Structure and Organization of Smooth Muscles01:13

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Smooth muscle tissue is a type of muscle tissue that can be found lining various vital organs in the human body, including the lungs, blood vessels, digestive tract, and respiratory tract. This type of tissue is responsible for regulating the movements of these organs, playing crucial roles in the functioning of various systems, including the vascular, digestive, respiratory, and urinary systems.
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Levels of Health Promotion and Illness Prevention01:26

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Health promotion allows a person to control the determinants of health, resulting in an improved health status. It enhances the quality of life and reduces premature deaths. Health promotion and illness prevention programs help people make beneficial choices to reduce the risk of disease and disabilities. There are three health promotion and illness prevention levels: primary, secondary, and tertiary prevention.
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Feedback Inhibition00:46

Feedback Inhibition

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Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
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Related Experiment Video

Updated: Feb 10, 2026

Measuring Proliferation of Vascular Smooth Muscle Cells Using Click Chemistry
07:17

Measuring Proliferation of Vascular Smooth Muscle Cells Using Click Chemistry

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NITRITE INCREASES MITOFUSIN-1 LEVELS TO INHIBIT VASCULAR SMOOTH MUSCLE CELL PROLIFERATION AND PREVENT INTIMAL

Wenxi An, Christopher Reyes, Krithika Rao

    Biorxiv : the Preprint Server for Biology
    |February 9, 2026
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    Nitrite protects against vascular injury by upregulating mitofusin-1 (Mfn1), a protein that controls mitochondrial fusion. This mechanism suppresses vascular smooth muscle cell proliferation and reduces intimal hyperplasia, a key factor in restenosis.

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    Isolation of Murine Coronary Vascular Smooth Muscle Cells
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    Area of Science:

    • Cardiovascular Biology
    • Mitochondrial Dynamics
    • Vascular Remodeling

    Background:

    • Vascular disease and intimal hyperplasia (IH) are driven by maladaptive vascular remodeling after injury.
    • Vascular smooth muscle cell (VSMC) proliferation is a key component of IH.
    • Nitrite is known to attenuate IH, but its mechanisms are unclear.

    Purpose of the Study:

    • To investigate the role of nitrite in modulating mitochondrial dynamics to suppress VSMC proliferation.
    • To determine if mitofusin-1 (Mfn1) mediates the protective effects of nitrite against IH.

    Main Methods:

    • Used rat aortic smooth muscle cells (RASMCs) and Mfn1 knockout mouse models.
    • Investigated nitrite's effects on VSMC proliferation, cell cycle, and gene expression.
    • Assessed IH in response to carotid artery ligation injury in wildtype and Mfn1-deficient mice.

    Main Results:

    • Nitrite inhibited VSMC proliferation by upregulating Mfn1, which promotes mitochondrial fusion.
    • Nitrite increased Mfn1 protein levels by inhibiting its proteasomal degradation.
    • Mfn1 deficiency enhanced VSMC proliferation and reduced antioxidant enzyme expression.
    • Mfn1 knockout mice showed exacerbated IH, and nitrite lost its protective effect in these mice.

    Conclusions:

    • Endogenous Mfn1 is a critical regulator of VSMC proliferation and vascular remodeling.
    • Mfn1 is an essential mediator of nitrite's vasoprotective effects against IH.
    • Targeting Mfn1 may offer new therapeutic strategies for vascular disease.