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Gender differences in experimental aortic aneurysm formation.

Gorav Ailawadi¹, Jonathan L Eliason, Karen J Roelofs

¹Jobst Vascular Research Laboratories, University of Michigan Medical School, Ann Arbor, USA.

Arteriosclerosis, Thrombosis, and Vascular Biology

|August 28, 2004

Summary

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Male rats develop larger abdominal aortic aneurysms (AAAs) more frequently than females, linked to increased matrix metalloproteinase-9 (MMP-9). Estradiol treatment reduced AAA size and MMP-9 in males, suggesting a protective role.

Area of Science:

Vascular Biology
Atherosclerosis Research
Endocrinology

Background:

Abdominal aortic aneurysm (AAA) affects men more than women.
The underlying biological mechanisms for this gender disparity are not fully understood.
Matrix metalloproteinases (MMPs) are implicated in AAA pathogenesis.

Purpose of the Study:

To investigate the role of gender and matrix metalloproteinases (MMPs) in experimental abdominal aortic aneurysm (AAA) development in a rodent model.
To explore the potential protective effect of estradiol on AAA formation.

Main Methods:

Rats (male and female) underwent elastase perfusion of the aorta.
Aortic tissue was analyzed for macrophage infiltration and MMP-9 expression and activity.
Experiments involved aortic transplantation between genders and estradiol administration to males.

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Main Results:

Male rats exhibited significantly larger AAAs and higher frequency compared to female rats.
Male aortas showed increased macrophage infiltration and elevated MMP-9 production and activity.
Female aortas transplanted into males lost their resistance to aneurysm formation, while male aortas in females maintained susceptibility.
Estradiol treatment in male rats reduced AAA size, macrophage infiltration, and MMP-9 levels.

Conclusions:

Significant gender-related differences exist in experimental AAA development.
Estrogen may exert a protective effect by reducing macrophage-mediated MMP-9 production.
These findings highlight potential therapeutic targets for AAA based on gender.