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Intussusceptive microvascular growth: a common alternative to capillary sprouting
S Patan1, M J Alvarez, J C Schittny
1Department of Developmental Biology, University of Berne, Switzerland.
Archives of Histology and Cytology
|January 1, 1992
Summary
Intussusceptive capillary growth, a novel microvascular expansion mechanism, involves tissue pillars forming new vascular meshes. This process, observed in rat lungs, was found to occur in various vascular systems across multiple organs.
Area of Science:
- Microvascular biology
- Angiogenesis research
- Vascular development
Background:
- Intussusceptive capillary growth is a newly described mechanism for microvascular expansion.
- This process involves the formation of slender transcapillary tissue pillars that create new vascular meshes.
- Initially observed in rat lungs, its prevalence in other vascular systems was unknown.
Purpose of the Study:
- To investigate the presence and distribution of intussusceptive growth indicators in various rat vascular systems.
- To determine if the corrosion cast technique is a suitable screening method for intussusceptive growth across different organs.
- To assess the universality of intussusceptive capillary growth as a microvascular development principle.
Main Methods:
- Preparation of Mercox corrosion casts from multiple rat vascular systems (eye, heart, liver, etc.).
- Age range of rats: 4 to 9 weeks.
- Screening of casts for characteristic "tiny holes" (1.5-micron diameter) representing tissue pillars, indicative of intussusceptive growth.
Main Results:
- Indicators of intussusceptive growth (tissue pillars) were detected in all investigated organs.
- These structures were observed in dilated vascular segments and at branching points.
- Pillars were identified even in complex, three-dimensional capillary networks.
Conclusions:
- Intussusceptive capillary growth is a widespread principle of microvascular development, not limited to the lungs.
- The presence of tissue pillars across diverse organs suggests a fundamental role in vascular expansion.
- Corrosion casting is an effective screening method for identifying intussusceptive growth in various vascular beds.