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Ovarian cysts in MRL/MpJ mice originate from rete ovarii

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BLACKWELL PUBLISHING
DOI: 10.1111/j.1439-0264.2006.00728.x

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In MRL mice aged more than 1 year, but not in C57BL/6 mice, ovaries had grossly visible cysts presenting unilaterally or bilaterally. Postnatally, all MRL mice developed ovarian cysts by 8 months of age. Observations by light microscopy, including lectin histochemistry, indicated that the cysts sometimes included papillomatous tissues located at the hilar region and were similar to the rete ovarii system, but not to follicles. Two types of epithelial cells, ciliated and non-ciliated, were arranged on the cysts, in which both cell types had many microvilli projecting in various directions and random ramifications in the cystic lumen. These characteristics suggest that ovarian cysts developing in MRL mice originate mostly from the rete ovarii. Cysts derived from the rete ovarii at 8 months of age were histologically detected in all C3H mice as well as MRL mice, with variable incidence in ICR, AKR, CBA/N and ddY, and none in C57L/6, DBA/2, BALB and A/J mice. However, measurement of the maximum diameters of the ovarian cysts indicated that MRL mice regularly possessed the largest cysts visible to the naked eye. This is the first report of ovarian cysts in this inbred strain, suggesting that ovarian cysts in MRL mice appear with stable incidence and development.

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