Permselectivity of blood follicle barriers in mouse ovaries of the mifepristone-induced polycystic ovary model revealed by in vivo cryotechnique.
Despite the potential association of polycystic ovary (PCO) syndrome with hemodynamic changes, follicular microenvironment and the involvement of blood follicle barriers (BFB), a histopathological examination has been hampered by artifacts caused by conventional preparation methods. In this study, mouse ovaries of a mifepristone-induced PCO model were morphologically and immunohistochemically examined by in vivo cryotechnique (IVCT), which prevents those technical artifacts. Ovarian specimens of PCO model mice were prepared by IVCT or the conventional perfusion fixation after s.c. injection of mifepristone. Their histology and immunolocalization of plasma proteins, including albumin (molecular mass, 69 kDa), immunoglobulin G (IgG, 150 kDa), inter-alpha-trypsin inhibitor (ITI, 220 kDa), fibrinogen (340 kDa), and IgM (900 kDa), were examined. In the PCO model, enlarged blood vessels with abundant blood flow were observed in addition to cystic follicles with degenerative membrana granulosa. The immunolocalization of albumin and IgM in the PCO model were similar to those in normal mice. Albumin immunolocalized in the blood vessels, interstitium or follicles, and IgM was mostly restricted within the blood vessels. In contrast, immunolocalization of IgG, ITI, and fibrinogen changed in the PCO model. Both IgG and ITI were clearly blocked by follicular basement membranes, and hardly observed in the membrana granulosa, though fibrinogen was mostly observed within blood vessels. These findings suggest that increased blood flow and enhanced selectivity of molecular permeation through the BFB are prominent features in the PCO ovaries, and changes in hemodynamic conditions and permselectivity of BFB are involved in the pathogenesis and pathophysiology of PCO syndrome.
Zhou
Hong
H
Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo-City, Yamanashi 409-3898, Japan.
Ohno
Nobuhiko
N
Terada
Nobuo
N
Saitoh
Sei
S
Naito
Ichiro
I
Ohno
Shinichi
S
D000510:Alpha-Globulins / Q000032:analysis; D000818:Animals; D015415:Biomarkers / Q000032:analysis; D001808:Blood Vessels / Q000737:chemistry / Q000473:pathology / Q000503:physiopathology*; D002199:Capillary Permeability; D015925:Cryopreservation; D005260:Female; D005340:Fibrinogen / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D007150:Immunohistochemistry; D051379:Mice; D008810:Mice, Inbred C57BL; D015735:Mifepristone; D023421:Models, Animal; D010053:Ovary / Q000098:blood supply* / Q000473:pathology; D011085:Polycystic Ovary Syndrome / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology*; D012039:Regional Blood Flow; D012709:Serum Albumin / Q000032:analysis; D013194:Staining and Labeling; D016707:Tissue Fixation
D000510:Alpha-Globulins; D015415:Biomarkers; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D012709:Serum Albumin; D015735:Mifepristone; C011877:inter-alpha-inhibitor; D005340:Fibrinogen