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Related Concept Videos

Chemotaxis in E. coli01:27

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Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain
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Gut chemosensing mechanisms.

Arianna Psichas, Frank Reimann, Fiona M Gribble

    The Journal of Clinical Investigation
    |February 10, 2015
    PubMed
    Summary
    This summary is machine-generated.

    The enteroendocrine system senses nutrients and releases gut hormones. Understanding this system and its neural interactions aids in developing new therapies for metabolic and digestive disorders.

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    Area of Science:

    • Physiology
    • Endocrinology
    • Neurogastroenterology

    Background:

    • The enteroendocrine system acts as the main sensor for ingested nutrients.
    • It secretes gut hormones that regulate gastrointestinal motility, secretion, glucose balance, and appetite.

    Purpose of the Study:

    • To provide an updated review of molecular mechanisms in enteroendocrine nutrient sensing.
    • To highlight current knowledge on neuro-hormonal regulation of gut hormone secretion.
    • To explore interactions between the enteroendocrine system and the enteric nervous system.

    Main Methods:

    • Literature review of molecular mechanisms.
    • Synopsis of current research on neuro-hormonal regulation.
    • Analysis of enteroendocrine-enteric nervous system interactions.

    Main Results:

    • Detailed overview of molecular pathways for nutrient sensing by enteroendocrine cells.
    • Elucidation of how gut hormone secretion is regulated by neural and hormonal signals.
    • Understanding of the integrated function of the enteroendocrine and enteric nervous systems.

    Conclusions:

    • A comprehensive understanding of enteroendocrine nutrient sensing and gut hormone regulation is crucial.
    • Further research into these systems can lead to novel therapeutic strategies for metabolic and digestive diseases.