Abstract
Capillary morphogenesis protein-2 (CMG2) functions as an anthrax toxin receptor that plays an essential role in anthrax pathogenesis. Although mutations in CMG2 have been identified to cause two human autosomal recessive disorders, Juvenile Hyaline Fibromatosis and Infantile Systemic Hyalinosis, both characterized by excess hyaline material deposition in connective tissues, the physiologic function of CMG2 remains elusive. To study the roles of CMG2 in normal physiology, here we performed detailed histological analyses of the CMG2-null mice we generated previously. While no morphological or histological defects were observed in CMG2(-/-) male mice, CMG2(-/-) female mice were unable to produce any offspring due to a defect in parturition. We found that deletion of CMG2 resulted in a diffuse deposition of collagen within the myometrium of CMG2(-/-) females, causing remarkable morphological changes to their uteri. This collagen accumulation also led to loss of smooth muscle cells in the myometrium of CMG2(-/-) mice, apparently disabling uterine contractile function during parturition. As a consequence, even though pregnant CMG2(-/-) mice were able to carry the gestation to full term, they were unable to deliver pups. However, the ...Continue Reading
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