Disruption of the TIMP-1 gene product is associated with accelerated endometrial gland formation during early postnatal uterine development.
Postnatal uterine development is marked by periods of tissue remodeling. The objective of the present study was to examine the role of tissue inhibitor of metalloproteinase-1 (TIMP-1), a regulator of tissue remodeling events, during postnatal uterine development and to assess the phenotypic consequences of disruption of the TIMP-1 gene product during this time period. To accomplish this goal, wild-type and TIMP-1 null mice were sacrificed at Postnatal Days (PNDs) 5, 10, 15, 20, and 25 and uterine morphology, TIMP expression and matrix metalloproteinase (MMP) activity were assessed. In wild-type mice, TIMP-1 mRNA steady-state levels were highest at PND 5, after which expression decreased. TIMP-2 and TIMP-3 expression in wild-type mice showed no significant changes from PND 5 to 25. In TIMP-1 null mice, TIMP-2 and TIMP-3 expression patterns were similar to those in wild-type counterparts with the exception that, at PND 10, TIMP-2 and TIMP-3 expression was significantly lower in the null mice. Endometrial gland number and uterine histology were similar between genotypes at PNDs 5 and 10, but at PNDs 15 and 20, endometrial glands were more abundant in TIMP-1 null mice. Associated with the increased gland density in the null mice was an increase in total MMP activity above the levels expressed in wild-type mice. In summary, disruption of the TIMP-1 gene product is associated with reduced TIMP-2 and TIMP-3 steady-state mRNA levels, elevated MMP activity, and accelerated endometrial gland formation. We conclude that, during early postnatal uterine development, TIMP-1 may be critical for proper endometrial gland development.
Zhou
Han-E
HE
Department of Obstetrics and Gynecology, Division of Basic and Clinical Women's Research, University of Kansas School of Medicine, 3901 Rainbow Blvd., Kansas City, KS 66160, USA.
Zhang
Xuan
X
Nothnick
Warren B
WB
D000818:Animals; D004717:Endometrium / Q000033:anatomy & histology / Q000254:growth & development* / Q000502:physiology*; D005088:Exocrine Glands / Q000033:anatomy & histology / Q000254:growth & development / Q000502:physiology; D005260:Female; D018507:Gene Expression Regulation, Developmental; D005838:Genotype; D008297:Male; D051379:Mice; D008817:Mice, Mutant Strains; D009929:Organ Size; D012333:RNA, Messenger / Q000032:analysis; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000235:genetics*; D019716:Tissue Inhibitor of Metalloproteinase-2 / Q000235:genetics; D019717:Tissue Inhibitor of Metalloproteinase-3 / Q000235:genetics
D012333:RNA, Messenger; D019715:Tissue Inhibitor of Metalloproteinase-1; D019717:Tissue Inhibitor of Metalloproteinase-3; D019716:Tissue Inhibitor of Metalloproteinase-2