The action of calcitonin gene-related pepide (CGRP) was studied on c-fos gene expression in rat astrocyte cultures. A strong and transient increase in c-fos mRNA was observed in cultured astrocytes after treatment with CGRP. Quantitative Northern blot analysis revealed an increase of c-fos mRNA within 15 min, a peak after 30 min with a 10 - 15 fold increase over unstimulated cells and a subsequent decline. Induction of the c-fos gene by CGRP was concentration-dependent, half maximal stimulation of c-fos mRNA being obtained with 100 nM CGRP. The CGRP effect appeared to be mediated by a CGRP receptor and calcitonin was found to mimic only weakly the action of CGRP on cultured astrocytes. Calcitonin transiently induced c-fos gene expression with a similar time course to CGRP, but its effect was much less pronounced. Agents affecting the intracellular cyclic AMP level, forskolin and Ro 20-1724, stimulated c-fos mRNA in a strong and transient fashion with a temporal sequence similar to the response to CGRP. Further, the phosphodiesterase inhibitor Ro 20-1724 potentiated the action of CGRP on c-fos mRNA induction, suggesting a role for cyclic AMP in the action of CGRP. The present results indicate that CGRP may play a physiological role as a regulator of astrocyte gene expression.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1111/j.1460-9568.1991.tb00856.x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Melatonin attenuates BDE-209-caused spatial memory deficits in juvenile rats through NMDAR-CaMKⅡγ-mediated synapse-to-nucleus signaling.
Food Chem Toxicol
January 2025
Department of Occupational and Environmental Health, School of Public Health, Jinzhou Medical University, Jinzhou, Liaoning, PR China. Electronic address:
Flame retardant polybrominated diphenyl ethers (PBDEs) accumulate in human bodies through food and dust ingestion, and cause neurobehavioral deficits with obscure mechanism. We aimed to investigate NMDAR-CaMKⅡγ-mediated synapse-to-nuclear communication involved in BDE-209-induced cognitive impairment, and alleviation from exogenous melatonin. Decreased NMDAR subunits GluN2A and 2B, autophosphorylation of CaMKⅡα, and postsynaptic GluA1 trafficking were observed in the hippocampus of juvenile rats after maternal BDE-209 exposure.
View Article and Find Full Text PDFNeurocan regulates axon initial segment organization and neuronal activity.
Matrix Biol
January 2025
German Center for Neurodegenerative Diseases (DZNE), Helmholtz Association of German Research Centers, Magdeburg, Germany; Center for Behavioral Brain Sciences (CBBS), Magdeburg, Germany; Medical Faculty, Otto-von-Guericke University, Magdeburg, Germany. Electronic address:
The neural extracellular matrix (ECM) accumulates in the form of perineuronal nets (PNNs), particularly around fast-spiking GABAergic interneurons in the cortex and hippocampus, but also around synapses and in association with the axon initial segments (AIS) and nodes of Ranvier. Increasing evidence highlights the role of Neurocan (Ncan), a brain-specific component of ECM, in the pathophysiology of neuropsychiatric disorders like bipolar disorder and schizophrenia. Ncan localizes at PNNs, perisynaptically, and at the nodes of Ranvier and the AIS, highlighting its potential role in regulating axonal excitability.
View Article and Find Full Text PDFFructo-Oligosaccharides Enhance the Expression of Genes Related to Focal Adhesion- and Inflammation-Pathways in Small Intestinal Absorptive Caco-2 Cells.
J Nutr Sci Vitaminol (Tokyo)
January 2025
Laboratory of Food and Nutritional Sciences, Department of Local Produce and Food Sciences, Faculty of Life and Environmental Sciences, University of Yamanashi.
Recently, we demonstrated, using mRNA microarray analysis, that fructo-oligosaccharides (FOS), which are indigestible carbohydrates, enhanced the expression of several inflammation-related genes, such as CLEC7A, CCL2, ITGA2, and F3, by ≥4-fold in Caco-2 cells, a model of human intestinal absorptive cells, independently of intestinal bacteria (Harasawa A et al., Nutrition, 112140, 2023). However, whether FOS enhances the expression of genes in other pathways, particularly the non-inflammatory pathways, in Caco-2 cells has not been investigated.
View Article and Find Full Text PDFAbnormal c-Fos expression in TetTag mice containing fos-EGFP.
Front Behav Neurosci
December 2024
Department of Psychology, University of California, Davis, Davis, CA, United States.
Molecular and genetic techniques now allow selective tagging and manipulation of the population of neurons, often referred to as "engram cells," that were active during a specific experience. One common approach to labeling these cells is to use the transgenic mouse (TetTag). In addition to tagging cells active during learning, it is common to examine the reactivation of these cells using immediate early gene (IEG) expression as an index of neural activity.
View Article and Find Full Text PDFUnderstanding transcription profiles of living tissues is critical for biology and medicine. However, measurement of the transcript levels is typically done in homogenized tissues post-mortem. Here, we present a new platform that enables non-invasive monitoring of specific mRNA levels , without tissue destruction.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!