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Goodale LF, Hayrabedyan S, Todorova K, Roussev R, Ramu S, Stamatkin C, Coulam CB, Barnea ER, Gilbert RO. PreImplantation factor (PIF) protects cultured embryos against oxidative stress: relevance for recurrent pregnancy loss (RPL) therapy. Oncotarget 2018; 8:32419-32432. [PMID: 28423690 PMCID: PMC5464799 DOI: 10.18632/oncotarget.16028] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 02/22/2017] [Indexed: 11/25/2022] Open
Abstract
Recurrent pregnancy loss (RPL) affects 2-3% of couples. Despite a detailed work-up, the etiology is frequently undefined, leading to non-targeted therapy. Viable embryos and placentae express PreImplantation Factor (PIF). Maternal circulating PIF regulates systemic immunity and reduces circulating natural killer cells cytotoxicity in RPL patients. PIF promotes singly cultured embryos' development while anti-PIF antibody abrogates it. RPL serum induced embryo toxicity is negated by PIF. We report that PIF rescues delayed embryo development caused by <3 kDa RPL serum fraction likely by reducing reactive oxygen species (ROS). We reveal that protein disulfide isomerase/thioredoxin (PDI/TRX) is a prime PIF target in the embryo, rendering it an important ROS scavenger. The 16F16-PDI/TRX inhibitor drastically reduced blastocyst development while exogenous PIF increased >2 fold the number of embryos reaching the blastocyst stage. Mechanistically, PDI-inhibitor preferentially binds covalently to oxidized PDI over its reduced form where PIF avidly binds. PIF by targeting PDI/TRX at a distinct site limits the inhibitor's pro-oxidative effects. The >3kDa RPL serum increased embryo demise by three-fold, an effect negated by PIF. However, embryo toxicity was not associated with the presence of putative anti-PIF antibodies. Collectively, PIF protects cultured embryos both against ROS, and higher molecular weight toxins. Using PIF for optimizing in vitro fertilization embryos development and reducing RPL is warranted.
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Affiliation(s)
- Lindsay F Goodale
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.,Department of Population Health and Reproduction, School of Veterinary Medicine, University of California-Davis, Davis, CA, USA
| | - Soren Hayrabedyan
- Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Krassimira Todorova
- Institute of Biology and Immunology of Reproduction, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | | | - Sivakumar Ramu
- CARI Reproductive Institute, Chicago, IL, USA.,Promigen Life Sciences, Downers Grove, IL, USA
| | - Christopher Stamatkin
- CARI Reproductive Institute, Chicago, IL, USA.,Therapeutic Validation Core, Indiana University Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN, USA
| | | | - Eytan R Barnea
- BioIncept, LLC, Cherry Hill, NJ, USA.,Society for the Investigation of Early Pregnancy (SIEP), Cherry Hill, NJ, USA
| | - Robert O Gilbert
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.,Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies
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