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Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex
Published on: March 28, 2012
Expression patterns of SLIT/ROBO mRNAs reveal a characteristic feature in the entorhinal-hippocampal area of macaque
Tetsuya Sasaki1,2,3, Yusuke Komatsu4,5, Tetsuo Yamamori6,7
1Division of Brain Biology, National Institute for Basic Biology, 38 Nishigonaka Myodaiji, Okazaki, 444-8585, Japan. tsasaki@md.tsukuba.ac.jp.
Objective:
SLITs are secreted glycoproteins that bind to Roundabouts (ROBOs) which are a family member of transmembrane receptors. SLIT signaling has well-conserved roles in mediating axon repulsion in a developing nervous system. We previously reported that SLIT1 mRNA is enriched in middle layers of the prefrontal cortex of macaque monkeys in a developmentally regulated manner. Other SLIT (SLIT2 and SLIT3) mRNAs showed preferential expressions in the prefrontal cortex with a distinct laminar pattern. To obtain further clues to the role of SLIT signaling in the organization of the primate brain, we performed ISH analysis of SLIT and ROBO mRNAs using adult macaque brain tissues.
Results:
In this study, we examined the expression patterns of SLITs and ROBOs (ROBO1 and ROBO2) in other brain regions, and found intense and characteristic expression patterns of these genes in the entorhinal-hippocampal area. In situ hybridization analysis revealed that SLIT1 and SLIT2 mRNAs showed marked complementary distribution in the entorhinal cortex. SLIT and ROBO mRNAs were widely expressed in the hippocampus with modest regional preference. These findings suggest that each SLIT gene has a specialized role that is particularly important for prefrontal as well as hippocampal connectivity in the primate cortex.
Insights
Secreted Slit (SLIT) proteins and Roundabout (ROBO) receptors play key roles in brain wiring. This study reveals their specific expression patterns in the adult macaque entorhinal-hippocampal area, suggesting specialized functions in primate brain connectivity.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- Slit (SLIT) proteins are secreted glycoproteins that interact with Roundabout (ROBO) transmembrane receptors.
- SLIT signaling is crucial for axon repulsion during nervous system development.
- Previous work identified SLIT1 mRNA enrichment in the macaque prefrontal cortex during development.
Purpose of the Study:
- To investigate the role of SLIT signaling in primate brain organization.
- To analyze the expression patterns of SLIT and ROBO mRNAs in adult macaque brain tissues.
Main Methods:
- In situ hybridization (ISH) analysis was performed on adult macaque brain tissues.
- Examined expression patterns of SLIT1, SLIT2, SLIT3, ROBO1, and ROBO2 mRNAs.
Main Results:
- SLIT and ROBO mRNAs exhibited intense and characteristic expression in the entorhinal-hippocampal area.
- SLIT1 and SLIT2 mRNAs showed complementary distribution in the entorhinal cortex.
- SLIT and ROBO mRNAs were widely expressed in the hippocampus with some regional preference.
Conclusions:
- SLIT and ROBO genes have specialized roles in primate brain connectivity, particularly in the prefrontal and hippocampal cortices.
- Complementary expression patterns suggest specific functional interactions between SLIT1 and SLIT2 in the entorhinal cortex.
