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Binli F, İnan İ, Büyükbudak F, Gram A, Kaya D, Liman N, Aslan S, Fındık M, Ay SS. The Efficacy of a 3β-Hydroxysteroid Dehydrogenase Inhibitor for the Termination of Mid-Term Pregnancies in Dogs. Animals (Basel) 2022; 12:ani12182475. [PMID: 36139334 PMCID: PMC9495022 DOI: 10.3390/ani12182475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 09/07/2022] [Accepted: 09/13/2022] [Indexed: 12/03/2022] Open
Abstract
Simple Summary The medical termination of unwanted pregnancies in dogs is practiced throughout the world for many reasons, including at the request of animal owners. For these procedures, it is advised to use rapidly effective drugs with minimal side effects. In this study, we investigated trilostane, which decreases progesterone levels, for its efficacy in terminating mid-term pregnancies in dogs, as well as potential side effects. Although trilostane is not a standalone alternative for the termination of pregnancy in dogs, it has been determined that its combined use with another medical agent of known efficacy reduces both the abortion time and potential side effects. Further studies investigating an increased frequency of administration rather than the administration dose could contribute to determining the efficacy of trilostane in dogs. Abstract Progesterone (P4) is the only hormone needed to maintain pregnancy in dogs. Therefore, a competitive inhibitor of 3β-hydroxysteroid dehydrogenase (3β-HSD) could be a safe and effective option to terminate pregnancy by inhibiting P4 synthesis. To address this hypothesis, we investigated the efficacy of trilostane (TRL), a competitive inhibitor of 3β-HSD, in terminating pregnancy in dogs. Twenty-one dogs between days 30 and 38 of pregnancy were randomly assigned to one of two treatment groups (trilostane (TRL) and aglepristone (AGL)) and an untreated control (CON) group (n = 7 dogs each). Fetal heart rates (FHRs) (measured at 12 h intervals) and serum P4 concentrations (measured at 6 h intervals) were evaluated. The pregnancy termination rates were 0% and 100% in the TRL and AGL groups, respectively. The decrease in the FHR in the TRL and AGL groups was significantly lower than that observed in the CON group. There was a marked decrease in P4 concentrations in the TRL group 6, 54, and 102 h after the initiation of treatment. The luteal expression of StAR appeared to be weaker in the AGL group than the CON group. In conclusion, although a treatment-induced decrease was observed in plasma P4 concentrations, a seven-day TRL treatment alone was not effective in terminating pregnancies. Further studies are needed on the effects of the prolonged administration of TRL with varying doses and frequencies for the termination of mid-term pregnancy in dogs.
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Affiliation(s)
- Firdevs Binli
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ondokuz Mayıs University, Samsun 55280, Turkey
- Correspondence: (F.B.); (S.S.A.); Tel.: +90-36-2312-1919-1546 (F.B.); +90-36-2312-1919-1226 (S.S.A.)
| | - İpek İnan
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ondokuz Mayıs University, Samsun 55280, Turkey
| | - Fatih Büyükbudak
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ondokuz Mayıs University, Samsun 55280, Turkey
| | - Aykut Gram
- Department of Histology and Embryology, Faculty of Veterinary Medicine, Erciyes University, Kayseri 38280, Turkey
| | - Duygu Kaya
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Kafkas University, Kars 36000, Turkey
| | - Narin Liman
- Department of Histology and Embryology, Faculty of Veterinary Medicine, Erciyes University, Kayseri 38280, Turkey
| | - Selim Aslan
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Near East University, Nicosia 99138, Cyprus
| | - Murat Fındık
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ondokuz Mayıs University, Samsun 55280, Turkey
| | - Serhan Serhat Ay
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ondokuz Mayıs University, Samsun 55280, Turkey
- Correspondence: (F.B.); (S.S.A.); Tel.: +90-36-2312-1919-1546 (F.B.); +90-36-2312-1919-1226 (S.S.A.)
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Shah NM, Lai PF, Imami N, Johnson MR. Progesterone-Related Immune Modulation of Pregnancy and Labor. Front Endocrinol (Lausanne) 2019; 10:198. [PMID: 30984115 PMCID: PMC6449726 DOI: 10.3389/fendo.2019.00198] [Citation(s) in RCA: 115] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 03/11/2019] [Indexed: 12/17/2022] Open
Abstract
Pregnancy involves a complex interplay between maternal neuroendocrine and immunological systems in order to establish and sustain a growing fetus. It is thought that the uterus at pregnancy transitions from quiescent to laboring state in response to interactions between maternal and fetal systems at least partly via altered neuroendocrine signaling. Progesterone (P4) is a vital hormone in maternal reproductive tissues and immune cells during pregnancy. As such, P4 is widely used in clinical interventions to improve the chance of embryo implantation, as well as reduce the risk of miscarriage and premature labor. Here we review research to date that focus on the pathways through which P4 mediates its actions on both the maternal reproductive and immune system. We will dissect the role of P4 as a modulator of inflammation, both systemic and intrinsic to the uterus, during human pregnancy and labor.
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Affiliation(s)
- Nishel M. Shah
- Department of Surgery and Cancer, Chelsea and Westminster Hospital, Imperial College London, London, United Kingdom
| | - Pei F. Lai
- Department of Surgery and Cancer, Chelsea and Westminster Hospital, Imperial College London, London, United Kingdom
| | - Nesrina Imami
- Department of Medicine, Chelsea and Westminster Hospital, Imperial College London, London, United Kingdom
| | - Mark R. Johnson
- Department of Surgery and Cancer, Chelsea and Westminster Hospital, Imperial College London, London, United Kingdom
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Shah NM, Herasimtschuk AA, Boasso A, Benlahrech A, Fuchs D, Imami N, Johnson MR. Changes in T Cell and Dendritic Cell Phenotype from Mid to Late Pregnancy Are Indicative of a Shift from Immune Tolerance to Immune Activation. Front Immunol 2017; 8:1138. [PMID: 28966619 PMCID: PMC5605754 DOI: 10.3389/fimmu.2017.01138] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Accepted: 08/29/2017] [Indexed: 12/12/2022] Open
Abstract
During pregnancy, the mother allows the immunologically distinct fetoplacental unit to develop and grow. Opinions are divided as to whether this represents a state of fetal-specific tolerance or of a generalized suppression of the maternal immune system. We hypothesized that antigen-specific T cell responses are modulated by an inhibitory T cell phenotype and modified dendritic cell (DC) phenotype in a gestation-dependent manner. We analyzed changes in surface markers of peripheral blood T cells, ex vivo antigen-specific T cell responses, indoleamine 2,3-dioxygenase (IDO) activity (kynurenine/tryptophan ratio, KTR), plasma neopterin concentration, and the in vitro expression of progesterone-induced blocking factor (PIBF) in response to peripheral blood mononuclear cell culture with progesterone. We found that mid gestation is characterized by reduced antigen-specific T cell responses associated with (1) predominance of effector memory over other T cell subsets; (2) upregulation of inhibitory markers (programmed death ligand 1); (3) heightened response to progesterone (PIBF); and (4) reduced proportions of myeloid DC and concurrent IDO activity (KTR). Conversely, antigen-specific T cell responses normalized in late pregnancy and were associated with increased markers of T cell activation (CD38, neopterin). However, these changes occur with a simultaneous upregulation of immune suppressive mechanisms including apoptosis (CD95), coinhibition (TIM-3), and immune regulation (IL-10) through the course of pregnancy. Together, our data suggest that immune tolerance dominates in the second trimester and that it is gradually reversed in the third trimester in association with immune activation as the end of pregnancy approaches.
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Affiliation(s)
- Nishel Mohan Shah
- Department of Surgery and Cancer, Imperial College London, Chelsea and Westminster Hospital, London, United Kingdom
| | - Anna A Herasimtschuk
- Department of Medicine, Imperial College London, Chelsea and Westminster Hospital, London, United Kingdom
| | - Adriano Boasso
- Department of Medicine, Imperial College London, Chelsea and Westminster Hospital, London, United Kingdom
| | - Adel Benlahrech
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine and Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Dietmar Fuchs
- Division of Biological Chemistry, Biocenter, Innsbruck Medical University, Innsbruck, Austria
| | - Nesrina Imami
- Department of Medicine, Imperial College London, Chelsea and Westminster Hospital, London, United Kingdom
| | - Mark R Johnson
- Department of Surgery and Cancer, Imperial College London, Chelsea and Westminster Hospital, London, United Kingdom
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Kaya D, Küçükaslan İ, Ağaoğlu A, Ay S, Schäfer-Somi S, Emre B, Bal Y, Einspanier A, Gürcan İ, Gültiken N, Aslan S. The effects of aglepristone alone and in combination with cloprostenol on hormonal values during termination of mid-term pregnancy in bitches. Anim Reprod Sci 2014; 146:210-7. [DOI: 10.1016/j.anireprosci.2014.03.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Revised: 02/26/2014] [Accepted: 03/12/2014] [Indexed: 11/16/2022]
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