The distinguishing cellular and molecular features of the endometriotic ovarian cyst: from pathophysiology to the potential endometrioma-mediated damage to the ovary. Hum Reprod Update. 2013 Oct 14.
Sanchez AM, Viganò P, Somigliana E, Panina-Bordignon P, Vercellini P, Candiani M.
The distinguishing cellular and molecular features of the endometriotic ovarian cyst: from pathophysiology to the potential endometrioma-mediated damage to the ovary. Hum Reprod Update. 2013 Oct 14.
"Una cisti endometriosica contiene grande quantità di ferro, specie reattive dell’ossigeno (ROS), enzimi proteolitici e altre molecole infiammatorie in concentrazioni da dieci a mille volte più alte che quelle presenti nel sangue periferico o in altri tipi di cisti benigne. La densità dei follicoli ovarici nel tessuto ovarico circostante alla cisti è significativamente più bassa rispetto a quella di un tessuto ovarico sano. Attualmente si sa poco sulla barriera fisica che separa la cisti endometriosica dal tessuto ovarico sano anche se ci sono sufficienti dimostrazioni a livello molecolare, istologico e morfologico che supportano l' idea che la cisti endometriosica e il suo contenuto possano influenzare negativamente la funzionalità del tessuto ovarico adiacente."
Abstract
BACKGROUND:
Clinical data suggest that the presence of an ovarian endometrioma may cause per se damage to the surrounding otherwise healthy ovarian tissue. However, the basic research has so far done a limited job in trying to understand the potential detrimental effect of an endometrioma presence in the context of the ovarian physiology. We have reviewed the literature with the aim of characterizing the pathophysiology of the endometrioma focusing mostly on factors and mechanisms potentially affecting the surrounding, otherwise normal, ovarian tissue.
METHODS:
Comprehensive searches of PUBMED were conducted to identify human studies published from 1991 to 2013 in the English language on the cellular and molecular characterization of the various endometrioma components.
RESULTS:
An endometrioma contains free iron, reactive oxygen species (ROS), proteolytic enzymes and inflammatory molecules in concentrations from tens to hundreds of times higher than those present in peripheral blood or in other types of benign cysts. The cyst fluid causes substantial changes in the endometriotic cells that it baths from gene expression modifications to genetic mutations The physical barrier between the cyst contents and the normal ovarian tissue is a thin wall composed of the ovarian cortex itself or fibroreactive tissue. ROS potentially permeating the surrounding tissues and proteolytic substances degrading the adjacent areas are likely to cause the substitution of normal ovarian cortical tissue with fibrous tissue in which the cortex-specific stroma is reduced. The fibrosis is associated with smooth muscle metaplasia and followed by follicular loss and intraovarian vascular injury. Follicular density in tissue surrounding the endometriotic cyst was consistently shown to be significantly lower than in healthy ovaries but this pathological change does not appear to be caused by the stretching of surrounding tissues owing to the presence of a cyst.
CONCLUSIONS:
There is sufficient molecular, histological and morphological evidence, in part deriving from knowledge of the pathophysiology, to support a deleterious effect of the endometrioma on the adjacent ovarian cortical tissue, independent of the mere mechanical stretching owing to its size.
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