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Arterial internal elastic lamina holes: relationship to function?

Shaun L Sandow¹, Danusia J Gzik, Robert M K W Lee

¹Department of Anesthesia, McMaster University, Hamilton, Ontario, Canada.

Journal of Anatomy

|February 12, 2009

Summary

Internal elastic lamina (IEL) holes and myoendothelial gap junction (MEGJ) density vary in rat and mouse arteries. IEL holes are necessary for MEGJ communication but may facilitate diffusion rather than direct cell contact.

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Area of Science:

Vascular biology
Cellular physiology
Histology

Background:

The internal elastic lamina (IEL) is a key component of arteries.
Myoendothelial gap junctions (MEGJ) mediate cell-to-cell communication.
Understanding their relationship is crucial for vascular health.

Purpose of the Study:

To investigate IEL fenestration characteristics and MEGJ density in various rat and mouse arteries.
To explore correlations between IEL holes, MEGJ density, and vessel size in normal and diseased states.

Main Methods:

Conventional, ultrastructural, and confocal microscopy were employed.
Quantification of IEL hole size, density, and MEGJ density in selected arteries.
Analysis across multiple rat and mouse strains and disease models.

Main Results:

IEL hole density showed significant variation within and between mesenteric arteries, even in normotensive strains.
No consistent correlation was found between IEL hole density and MEGJ density across vessel types.
A positive correlation existed between resistance artery size and MEGJ density, but not with IEL hole density.

Conclusions:

IEL holes are essential for MEGJ communication but may primarily support diffusion-based signaling.
Vessel size influences MEGJ density in resistance arteries.
Findings offer insights into vascular signaling mechanisms and structural adaptations.