Bipolar Cell Terminals
Bipolar Cell Terminals - Related Videos
11:54
Imaging Exocytosis in Retinal Bipolar Cells with TIRF Microscopy
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Cited by 18 •
2009
In this video, we demonstrate how to label and visualize single synaptic vesicle exocytosis and trafficking in goldfish retinal bipolar cells using total internal reflectance fluorescence (TIRF) microscopy.
01:44
Termination of Translation
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2020
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
08:35
Examination of Drosophila Larval Tracheal Terminal Cells by Light Microscopy
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Cited by 11 •
2013
Here, we present a method for light microscopy analysis of tracheal terminal cells in Drosophila larvae. This method allows for quick examination of branch and lumen morphology in whole animals and would be useful for analysis of individual mutants or screens for mutations affecting terminal cell development.
09:37
Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs
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Cited by 10 •
2009
A new means to measure neurotransmission optically using fluorescent dopamine analogs.
01:30
Bipolar Disorder
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2025
Bipolar disorder is a chronic mental health condition marked by significant mood fluctuations, including episodes of mania and depression. Elevated energy levels, heightened mood or irritability, impulsive behavior, reduced sleep needs, rapid speech, racing thoughts, inflated self-esteem, and distractibility characterize mania. Individuals with bipolar disorder often alternate between depressive and manic states, with periods of emotional stability lasting an average of six months to a year.
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At these presynaptic endings, calcium entry regulates glutamate secretion at ribbon synapses. This coupling links changes in membrane potential to transmitter output, allowing bipolar neurons to pass graded visual signals to downstream retinal cells. Examining this process helps explain how electrical changes are converted into chemical communication during the early stages of retinal information processing.
Ribbon synapses provide the specialized release sites through which bipolar cells secrete glutamate in response to graded membrane-potential changes. Their presence is therefore central to understanding how sensory signals move from upstream retinal cells to ganglion and amacrine cells. Studying these synapses connects the structure of a terminal with the timing and regulation of visual neurotransmission.
ON and OFF bipolar pathways respond differently to changes in light intensity. Their distinct responses preserve contrast information while visual signals pass through the retina, and they also help retain temporal features of those changes. Comparing the two pathways shows how terminal output contributes to parallel processing rather than transmitting all light-related signals in a single format.
Analysis of bipolar cell terminals can clarify cellular mechanisms underlying retinal disorders because these endings link membrane-potential changes with glutamate release. The same information supports research on emerging vision-restoration strategies by identifying how signals should be conveyed through retinal circuits. Their study therefore connects basic synaptic mechanisms with efforts to understand or recover visual information processing.
Bipolar cell terminals release glutamate onto retinal ganglion cells and amacrine cells. This downstream arrangement places the terminals between upstream sensory cells and two important classes of retinal neurons involved in further circuit processing. Examining these connections helps researchers determine how changes in bipolar-cell output are distributed through retinal pathways before visual information continues onward.
Their contribution depends on two linked features: graded changes in membrane potential regulate transmitter release, while distinct ON and OFF pathways respond differently to light intensity. Together, these properties allow retinal circuits to retain both contrast and temporal information as signals advance. This makes terminal signaling relevant to understanding how the retina represents changing visual conditions.