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Calcitonin gene-related peptide innervation and binding sites in rat aorta during development
1Université de Genève, Anatomie et Physiologie Comparées, Switzerland.
Insights
Calcitonin gene-related peptide (CGRP) innervation in the rat aorta is highest in the aortic arch during early development. This CGRP innervation, though low compared to other arteries, plays a role in aortic smooth muscle development.
Area of Science:
- Vascular biology
- Developmental biology
- Neuroscience
Background:
- Calcitonin gene-related peptide (CGRP) is a neuropeptide involved in various physiological processes.
- Understanding CGRP's role in vascular development is crucial for cardiovascular research.
Purpose of the Study:
- To investigate the developmental pattern of CGRP innervation in the rat aorta.
- To determine the distribution and density of CGRP in different aortic regions and developmental stages.
Main Methods:
- Indirect immunohistochemistry on whole mount rat aortas from embryonic day 17 to 6 months.
- Autoradiographic studies on serial sections of the aorta.
Main Results:
- CGRP innervation is most dense in the aortic arch, particularly at early postnatal stages (day 1, 3 weeks, 5 weeks).
- Innervation density is generally low compared to other arteries, increasing from isolated fibers in embryos to a meshwork in adults.
- No significant sex-based differences in CGRP innervation were observed.
- Autoradiography did not detect CGRP binding sites in the aortic wall, possibly due to low density or weak affinity.
Conclusions:
- CGRP innervation in the rat aorta exhibits a distinct developmental trajectory, with peak density in the aortic arch early in life.
- The observed CGRP innervation pattern suggests a potential role in the development and regulation of rat aortic smooth muscle.
Abstract:
Indirect immunohistochemistry performed on whole mounts of arch and thoracic part of the rat aorta at six developmental stages (from embryonic day 17 to 6 months, in males and females) revealed that calcitonin gene-related peptide (CGRP) innervation is highest in the arch. The highest density of innervation is found at the three first postnatal ages investigated (day 1, day 3 and 5 weeks; 2.6 +/- 0.6 intercepts/mm in the arch at 1 day); however, all values are low compared to other arteries. The innervation grows from a few short isolated fibres in the embryo to a more complex meshwork in older animals. No striking differences were noticed between males and females. Autoradiographic studies were performed on serial sections at several levels of the aorta but did not reveal binding sites for CGRP in the vascular wall. This might be due to the technique which does not allow visualization of low density of binding sites, or to binding sites of weak affinity. We discuss the possible importance of CGRP in rat aortic smooth muscle development.