Human Reproduction, Vol. 16, No. 6, 1065-1075,
June 2001
© 2001 European Society of Human Reproduction and Embryology
Focal vascular endothelial growth factor correlates with angiogenesis in human endometrium. Role of intravascular neutrophils
Monash University Department of Obstetrics and Gynecology, Monash Medical Centre, 246 Clayton Road, Clayton, Victoria, 3168 Australia
Vascular endothelial growth factor (VEGF) is expressed in human endometrium, but the cellular source of VEGF for endometrial angiogenesis has not been determined. In the present study the relationship between focal VEGF associated with microvessels and endothelial cell proliferation was examined in three layers of human endometrium at various stages of the menstrual cycle (menstrual, proliferative and secretory). Immunohistochemical analysis of full thickness endometrium from 18 hysterectomy samples without endometrial pathology were examined. The percentage of proliferating vessels was higher in proliferative compared to secretory endometrium, but this was only statistically significant in the basalis layer. A significantly greater percentage of VEGF-expressing microvessels was observed in proliferative than secretory endometrium (P < 0.05). The most VEGF-expressing microvessels were observed in the subepithelial capillary plexus, followed by the functionalis and least were present in the basalis. There was a significant correlation between focal VEGF-expressing microvessels and proliferating vessels for the subepithelial capillary plexus (Rs = 0.70, P = 0.008), the functionalis (Rs = 0.70, P = 0.001) and the basalis (Rs = 0.76, P < 0.001). Focal VEGF associated with microvessels was found in marginating and adherent neutrophils. These data suggest that neutrophils in intimate contact with endometrial endothelium may be a source of intravascular VEGF for vessels undergoing angiogenesis by elongation or intussusception, particularly during the proliferative phase of rapid endometrial growth.
Key words: angiogenesis/endometrium/human/neutrophils/VEGF
1 To whom correspondence should be addressed. E-mail: caroline.gargett{at}med.monash.edu.au
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