SP22 sperm protein as a potential biomarker of fertility in humans: A preliminary study

Rosa, Josiane de Lima; Figueiredo, Thamíris Moreira; Barros, Jorge Willian Franco; Santos, Driéle Bretone dos; Deus, Ramão Souza de; Borges, Cibele dos Santos; Kempinas, Wilma De Grava; Klinefelter, Gary R.

doi:10.1016/j.reprotox.2023.108343

Cited by 2 publications

(2 citation statements)

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“…3 The protein has recently been suggested as a potential biomarker for fertility in humans. 4 SP22/DJ-1 has been associated with fertilization at the level of interaction with oocytes. 5,6 In horses, SP22 is present on equine spermatozoa.…”

Section: Introductionmentioning

confidence: 99%

“…There is a 90% homology between rat SP22 and the human protein DJ‐1 and PARK7 that initially were identified by an oncogenic activity, 1,2 and later shown to be highly correlated with fertility in rats 3 . The protein has recently been suggested as a potential biomarker for fertility in humans 4 . SP22/DJ‐1 has been associated with fertilization at the level of interaction with oocytes 5,6 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of testicular degeneration on expression of sperm protein at 22 kDa in stallions

et al. 2023

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BackgroundSperm protein at 22 kDa has been associated with fertility.ObjectivesThe objectives of this study were to determine (1) the localization pattern of SP22 on ejaculated and caudal epididymal equine spermatozoa and in epididymal fluid, and to (2) characterize SP22 protein and mRNA expression in testicular and epididymal tissues in response to heat‐induced testicular degeneration.Materials and methodsSemen was collected before and after hemi‐castration, as well as prior to and following insulation of the remaining testes, and tissue specimens were collected for analysis.ResultsHistopathology confirmed degeneration in insulated testes. Ejaculated and epididymal spermatozoa from samples collected prior to insulation of the testicles had a predominant staining pattern of SP22 over the equatorial region. However, the equatorial pattern in the pre‐insulation epididymal semen samples was significantly lower than in the pre‐insulation ejaculated semen samples (68 ± 3, 81 ± 2.6, respectively). Ejaculated and epididymal samples collected after insulation of the testicles showed a complete loss of staining as the predominant pattern. Western blot analysis verified the presence of SP22 on fresh ejaculated spermatozoa prior to and following heat‐induced degeneration, on epididymal spermatozoa after testicular insulation, and in testicular and epididymal tissues. Heat insulation significantly reduced messenger RNA expression in the head of the epididymis and testicular tissues. Immunohistochemistry of the testicular and epididymal tissues pre‐heating showed considerably weaker staining than the same tissues post‐heating.Discussion and conclusionIt was concluded that heat‐induced testicular damage causes both loss and relocation of SP22 on the sperm membrane. Future studies are warranted to determine the diagnostic value of these findings.

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