1
|
Prostaglandin F2α-induced luteolysis involves activation of Signal transducer and activator of transcription 3 and inhibition of AKT signaling in cattle. Mol Reprod Dev 2017; 84:486-494. [DOI: 10.1002/mrd.22798] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Accepted: 03/20/2017] [Indexed: 01/07/2023]
|
2
|
Pugliesi G, Miagawa BT, Paiva YN, França MR, Silva LA, Binelli M. Conceptus-induced changes in the gene expression of blood immune cells and the ultrasound-accessed luteal function in beef cattle: how early can we detect pregnancy? Biol Reprod 2014; 91:95. [PMID: 25210129 DOI: 10.1095/biolreprod.114.121525] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
We aimed to identify the functional characteristics of the corpus luteum (CL) by color Doppler ultrasonography and changes in interferon-stimulated gene (ISG) expression in peripheral blood mononuclear cells (PBMCs) during early pregnancy in beef cows. We then aimed to use these features to establish earlier pregnancy diagnosis methods. In experiment 1, the CL size and blood flow were accessed by Doppler ultrasonography, and the PBMCs were isolated on Days 8, 12, 15, 18, 20, 22, 25, 30, 45, and 60 post-timed artificial insemination (TAI) from pregnant (n = 10) and nonpregnant cows (n = 12). The abundance of ISG (OAS1, MX1, MX2, and ISG15) transcripts was measured by quantitative PCR. Analyses of OAS1 and MX2 expression in isolated PBMCs (ISG-PBMC method) and Doppler imaging of CL (Doppler-US method) were performed to test the accuracy of these methods for the diagnosis of pregnancy on Day 20 post-TAI (n = 110; experiment 2). In experiment 1, the luteal volume and blood flow were reduced in nonpregnant cows during the first weeks post-TAI, but an evaluation of CL vascularization and size was efficient in identifying nonpregnant cows on Day 20 post-TAI. The expression of ISGs in PBMCs can be stimulated by the presence of a viable conceptus between Days 15 and 22 post-TAI, and the expression of these genes reaches a peak on Day 20. In experiment 2, the Doppler-US and ISG-PBMC methods resulted in similar specificity (85.5 and 87.7%, respectively). However, only the Doppler-US method resulted in 100% sensitivity. In conclusion, the greatest abundance of ISGs in PBMCs and a high detection of luteolysis by Doppler imaging on Day 20 post-TAI can be feasibly used for the earlier detection of nonpregnant cows in reproductive programs. The level of accuracy for our described pregnancy methods is high on Day 20 (80%-91%), but only the Doppler imaging method results in an absence of false-negative diagnoses.
Collapse
Affiliation(s)
- Guilherme Pugliesi
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, São Paulo, Brazil Laboratory of Theriogenology Dr. O.J. Ginther, Department of Veterinary, School of Animal and Food Sciences, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Bruna T Miagawa
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Yasmin N Paiva
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Moana R França
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Luciano A Silva
- Laboratory of Theriogenology Dr. O.J. Ginther, Department of Veterinary, School of Animal and Food Sciences, University of São Paulo, Pirassununga, São Paulo, Brazil
| | - Mario Binelli
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, São Paulo, Brazil
| |
Collapse
|
3
|
Hormone concentrations temporally associated with contralateral and ipsilateral relationships between the CL and preovulatory follicle during the third follicular wave in heifers. Theriogenology 2013; 80:738-47. [DOI: 10.1016/j.theriogenology.2013.06.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 06/17/2013] [Accepted: 06/17/2013] [Indexed: 11/20/2022]
|
4
|
Pugliesi G, Oliveria ML, Scolari SC, Lopes E, Pinaffi FV, Miagawa BT, Paiva YN, Maio JRG, Nogueira GP, Binelli M. Corpus luteum development and function after supplementation of long-acting progesterone during the early luteal phase in beef cattle. Reprod Domest Anim 2013; 49:85-91. [PMID: 24001093 DOI: 10.1111/rda.12231] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 08/03/2013] [Indexed: 11/29/2022]
Abstract
Strategic supplementation of P4 may be used to increase conception rates in cattle, but timing of supplementation in relation to ovulation, mass of supplementary P4 and formulation of the P4-containing supplement has not been determined for beef cattle. Effects of supplementation of long-acting progesterone (P4) on Days 2 or 3 post-ovulation on development, function and regression of corpus luteum (CL) were studied in beef cattle. Cows were synchronized with an oestradiol/P4-based protocol and treated with 150 or 300 mg of long-acting P4 on Day 2 or 3 post-ovulation (6-7 cows/group). Colour-doppler ultrasound scanning and blood sample collection were performed from Day 2-21.5. Plasma P4 concentrations were greater (p < 0.05) from Day 2.5-5.5 in the Day 2-treated groups and from Day 3.5-5.5 in the Day 3-treated cows than in the control group. CL area and blood flow during Day 2-8.5 did not differ (p > 0.05) among groups, suggesting no effect of P4 treatment on luteal development. The frequency of cows that began luteolysis before Day 15 was greater (p < 0.04) in cows treated with 300 mg than in the controls, but there were no differences between non-treated and 150 mg-treated cows. The interval from pre-treatment ovulation to functional and structural luteolysis was shorter (p < 0.01) in the combined P4-treated groups than in the control cows. In conclusion, was showed for the first time that long-acting P4 supplementation on Day 2 or 3 post-ovulation increases P4 concentrations for ≥3 day, has no effect on luteal development, but anticipates the beginning of luteolysis in beef cattle.
Collapse
Affiliation(s)
- G Pugliesi
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Length of the luteal phase and frequency of the four permutations between two or three follicular waves and ipsilateral or contralateral locations of the corpus luteum and preovulatory follicle in heifers. Theriogenology 2013; 80:114-9. [DOI: 10.1016/j.theriogenology.2013.03.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 03/11/2013] [Accepted: 03/11/2013] [Indexed: 11/23/2022]
|
6
|
Ginther OJ, Pinaffi FLV, Khan FA, Duarte LF, Beg MA. Follicular-phase concentrations of progesterone, estradiol-17β, LH, FSH, and a PGF2α metabolite and daily clustering of prolactin pulses, based on hourly blood sampling and hourly detection of ovulation in heifers. Theriogenology 2013; 79:918-28. [PMID: 23434204 DOI: 10.1016/j.theriogenology.2012.12.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 12/27/2012] [Accepted: 12/27/2012] [Indexed: 12/17/2022]
Abstract
Circulating concentrations of hormones were determined each hour in 13 heifers from the end of the luteolytic period to ovulation (follicular phase, 3.5 days). Diameter of the preovulatory follicle was determined every 8 hours, and the time of ovulation was determined hourly. The diameter of the preovulatory follicle decreased 0.8 ± 0.1 mm/h in heifers when there was 1 to 3 hours between the last two diameter measurements before ovulation. The concentration of progesterone (P4) after the end of the luteolytic period (P4 < 1 ng/mL) changed (P < 0.0001), as shown by a continued decrease until Hour -57 (Hour 0 = ovulation), then was maintained at approximately 0.2 ng/mL until 2 hours before the peak of the LH surge at Hour -26, and then a decrease to 0.1 ng/mL along with a decrease in estradiol-17β. Concentrations of LH gradually increased (P < 0.007) and concentrations of FSH gradually decreased (P < 0.0001) after the end of luteolysis until the beginning nadirs of the respective preovulatory surges. A cluster of prolactin (PRL) pulses occurred (P < 0.0001) each day with approximately 24 hours between the maximum value of successive clusters. Hourly concentrations of a PGF2α metabolite decreased (P < 0.007) until Hour -40, but did not differ among hours thereafter. Novel observations included the gradual increase in LH and decrease in FSH until the beginning of the preovulatory surges and follicle diameter decrease a few hours before ovulation. Results supported the following hypotheses: (1) change in the low circulating P4 concentrations during the follicular phase are temporally associated with change in LH concentrations; and (2) PRL pulses occur in a cluster each day during the follicular phase of the estrous cycle.
Collapse
Affiliation(s)
- O J Ginther
- Eutheria Foundation, Cross Plains, Wisconsin, USA.
| | | | | | | | | |
Collapse
|
7
|
Ginther O, Pinaffi F, Rodriguez M, Duarte L, Beg M. Stimulatory effect of PGF2α on PRL based on experimental inhibition of each hormone in mares. Theriogenology 2012; 78:1960-8. [DOI: 10.1016/j.theriogenology.2012.08.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 06/29/2012] [Accepted: 08/02/2012] [Indexed: 11/28/2022]
|
8
|
Ginther O, Santos V, Mir R, Beg M. Role of LH in the progesterone increase during the bromocriptine-induced prolactin decrease in heifers. Theriogenology 2012; 78:1969-76. [DOI: 10.1016/j.theriogenology.2012.08.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 07/21/2012] [Accepted: 08/01/2012] [Indexed: 11/26/2022]
|