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Rat oligodendrocytes and astrocytes preferentially express fibroblast growth factor receptor-2 and -3 mRNAs
1Department of Genetic Biochemistry, Kyoto University Faculty of Pharmaceutical Sciences, Japan.
Abstract:
Fibroblast growth factors (FGFs) exert various effects on glial cells as well as on neurons in the brain. The mRNAs for four FGF receptors (FGFR-1-FGFR-4) are expressed in the brain. Although FGFR-1 and -4 mRNAs are preferentially expressed in neurons, FGFR-2 and -3 mRNAs are preferentially expressed in glial cells. However, the glial cells that express these receptors remained to be identified. In this study, we found that oligodendrocytes and astrocytes in the brain preferentially expressed FGFR-2 and FGFR-3 mRNAs, respectively. The isoforms of immunoglobulin-like domain III (IIIb and IIIc) of the receptors have crucial roles in ligand binding. We also determined the isoforms of FGFR-2 and FGFR-3 expressed in glial cells to be of type IIIc. The expression of FGFR-2 IIIc and FGFR-3 IIIc with different ligand specificities might play important roles in the various effects of FGFs on oligodendrocytes and astrocytes.
Insights
Fibroblast growth factors (FGFs) impact brain cells. This study identifies that oligodendrocytes express FGF receptor-2 (FGFR-2) and astrocytes express FGF receptor-3 (FGFR-3), revealing specific glial cell receptor expression.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Fibroblast growth factors (FGFs) are known to influence neuronal and glial cell functions within the brain.
- Four types of FGF receptors (FGFR-1 to FGFR-4) are expressed in the brain, with FGFR-1 and FGFR-4 predominantly found in neurons.
- While FGFR-2 and FGFR-3 mRNAs are preferentially expressed in glial cells, the specific glial subtypes involved were not previously identified.
Purpose of the Study:
- To identify the specific glial cell types in the brain that express Fibroblast Growth Factor Receptors (FGFRs).
- To determine the specific isoforms of FGFR-2 and FGFR-3 expressed by glial cells.
- To understand the potential implications of glial-specific FGFR expression in mediating FGF effects.
Main Methods:
- Analysis of mRNA expression patterns for FGFR-2 and FGFR-3 in different glial cell populations.
- Identification of the specific immunoglobulin-like domain III isoforms (IIIb and IIIc) expressed by FGFR-2 and FGFR-3 in glial cells.
- Correlating receptor isoform expression with known ligand-binding specificities.
Main Results:
- Oligodendrocytes were found to preferentially express FGFR-2 mRNA.
- Astrocytes were found to preferentially express FGFR-3 mRNA.
- Both FGFR-2 and FGFR-3 expressed in these glial cells were identified as the IIIc isoform.
Conclusions:
- Oligodendrocytes and astrocytes express distinct FGFR subtypes (FGFR-2 and FGFR-3, respectively).
- The expression of the FGFR-2 IIIc and FGFR-3 IIIc isoforms in glial cells suggests specific roles in mediating FGF signaling.
- These findings highlight the differential expression of FGF receptors in glial cells, contributing to the diverse effects of FGFs in the central nervous system.