C-fos Expression
C-fos Expression - Related Videos
08:37
Fluorescence Activated Cell Sorting (FACS) and Gene Expression Analysis of Fos-expressing Neurons from Fresh and Frozen Rat Brain Tissue
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Cited by 34 •
2016
Here we present a Fluorescence Activated Cell Sorting (FACS) protocol to study molecular alterations in Fos-expressing neuronal ensembles from both fresh and frozen brain tissue. The use of frozen tissue allows FACS isolation of many brain areas over multiple sessions to maximize the use of valuable animal subjects.
05:44
The c-FOS Protein Immunohistological Detection: A Useful Tool As a Marker of Central Pathways Involved in Specific Physiological Responses In Vivo and Ex Vivo
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Cited by 44 •
2016
Here, we present a protocol based on c-FOS protein immunohistological detection, a classical technique used for the identification of neuronal populations involved in specific physiological responses in vivo and ex vivo.
08:07
Simultaneous Detection of c-Fos Activation from Mesolimbic and Mesocortical Dopamine Reward Sites Following Naive Sugar and Fat Ingestion in Rats
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Cited by 24 •
2016
The goal of this study is to identify reward-related distributed brain networks by delineating a reliable immunohistological technique using cellular c-fos activation to measure simultaneous changes in dopamine pathways and terminal sites after novel ingestion of fat and sugar in rats.
10:09
Methods for Evaluating the Role of c-Fos and Dusp1 in Oncogene Dependence
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2019
Here, we describe protocols for the genetic and chemical validation of c-Fos and Dusp1 as a drug target in leukemia using in vitro and in vivo genetic and humanized mouse models. This method can be applied to any target for genetic validation and therapeutic development.
10:34
Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells
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Cited by 2 •
2010
This procedure describes a quick and easy workflow to introduce siRNA into difficult to transfect cell lines and follow gene expression by real-time PCR. Use of an automated cell counter, multi-well electroporation plate, and automated electrophoresis station provide quick and reliable results without the need for expensive robotic handling.
FAQs
Synaptic activation can raise intracellular calcium, which engages kinase pathways and activates transcription factors such as CREB. These factors promote transcription of the c-fos gene, followed by synthesis of Fos protein. Fos may then contribute to AP-1-mediated gene regulation, connecting transient neuronal signaling with changes in transcriptional control.
Timing and stimulus intensity shape how C-fos findings should be interpreted because the molecular response is linked to recent cellular stimulation rather than serving as a timeless measure of circuit activity. A brief or weak stimulus may produce a different detectable pattern from a stronger or differently timed challenge. Comparisons should account for tissue sampling time and stimulation strength.
The two readouts represent different stages of the same activity-linked pathway: c-fos mRNA reflects gene transcription, whereas Fos protein reflects subsequent translation. In practice, in situ hybridization measures the transcript and immunohistochemistry detects the protein. Distinguishing them clarifies what molecular signal a brain map actually represents.
Researchers can measure c-fos mRNA with in situ hybridization or detect Fos protein with immunohistochemistry. Both approaches provide spatial information, allowing labeled cells to be related to anatomical brain regions. The selected readout determines whether the experiment maps the transcript or its translated protein, so method choice should match the molecular question.
Researchers examine C-fos expression when they want to relate neural recruitment to sensory input, behavior, stress, or learning. Mapping labeled cells across brain regions can show which anatomical areas respond during a chosen condition. This approach is useful for generating circuit-level hypotheses, but the pattern reflects the experimental stimulus and sampling time, not an all-purpose activity map.
Interpretation should combine the location of labeled cells with the experimental context and molecular readout used. A regional Fos pattern can support an association between a stimulus and recruited neural tissue, but it does not by itself establish the detailed circuit mechanism. Considering timing and stimulus intensity helps prevent overinterpreting regional differences.