1
|
Martín A, Castaño C, O'Brien E, Toledano-Díaz A, Guerra R, Gómez-Guillamón F, Santiago-Moreno J. Equilibration time improves the sperm variables of wild ruminant ejaculated and epididymal sperm cryopreserved by ultra-rapid freezing. Cryobiology 2023; 113:104579. [PMID: 37633480 DOI: 10.1016/j.cryobiol.2023.104579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/18/2023] [Accepted: 08/22/2023] [Indexed: 08/28/2023]
Abstract
This work examines the effect of equilibration time with extender on ultra-rapidly frozen-thawed wild ruminant epididymal (origin: Iberian ibex) and ejaculated (origin: mouflon) sperm variables. Sperm samples were prepared either without prior equilibration, or equilibrated for 30 min before freezing. Higher quality (p < 0.05) frozen-thawed spermatozoa were obtained when equilibration was allowed, for ejaculated sperm in terms of sperm motility, acrosome apical ridge integrity, sperm viability, and percentage of normal cells, and for epididymal sperm in terms of linearity and straightness of sperm movement. The sperm head area, head perimeter, head length and head width were smaller (p < 0.01) in the equilibrated than non-equilibrated frozen-thawed epididymal sperm; no such dimensional changes were recorded for ejaculated sperm. In conclusion, equilibration prior to ultra-rapid freezing improves the cryoresistance of sperm cells, although viable sperm cells can be obtained without equilibration. The epididymal sperm showed greater cryoresistance, supporting the idea that it is more resistant to freeze-thawing than ejaculated sperm.
Collapse
Affiliation(s)
- Adrián Martín
- Department of Animal Reproduction, INIA-CSIC, Madrid, Spain
| | | | - Emma O'Brien
- Department of Animal Reproduction, INIA-CSIC, Madrid, Spain
| | | | | | - Félix Gómez-Guillamón
- Programa de Vigilancia Epidemiológica de la Fauna Silvestre en Andalucía (PVE), Consejería de Agricultura, Ganadería, Pesca y Desarrollo Sostenible, Junta de Andalucía, Málaga, Spain
| | | |
Collapse
|
2
|
Melo MN. Coarse-Grain Simulations of Membrane-Adsorbed Helical Peptides. Methods Mol Biol 2022; 2405:137-150. [PMID: 35298812 DOI: 10.1007/978-1-0716-1855-4_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The amphipathic α-helix is a common motif for peptide adsorption to membranes. Many physiologically relevant events involving membrane-adsorbed peptides occur over time and size scales readily accessible to coarse-grain molecular dynamics simulations. This methodological suitability, however, comes with a number of pitfalls. Here, I exemplify a multi-step adsorption equilibration procedure on the antimicrobial peptide Magainin 2. It involves careful control of peptide freedom to promote optimal membrane adsorption before other interactions are allowed. This shortens preparation times prior to production simulations while avoiding divergence into unrealistic or artifactual configurations.
Collapse
Affiliation(s)
- Manuel N Melo
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal.
| |
Collapse
|
3
|
Lau SK, Subbiah J. HumidOSH: A self-contained environmental chamber with controls for relative humidity and fan speed. HardwareX 2020; 8:e00141. [PMID: 35498265 PMCID: PMC9041230 DOI: 10.1016/j.ohx.2020.e00141] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 08/09/2020] [Accepted: 09/03/2020] [Indexed: 06/02/2023]
Abstract
Relative humidity can affect physical, biological, and chemical changes in biological samples through modification of water activity and is also known to be important in the fabrication of sensitive electronic devices. The HumidOSH is a free, open source, and self-contained system for creating a controlled relative humidity environment within the range of 3 to 97% with a 0.2% tolerance. Each HumidOSH unit also comes with a fan with adjustable fan rotational speed to improve moisture uniformity inside the chamber. The system includes many additional features such as glove ports for manipulating samples, a sample door for transferring objects in and out of the system, ceiling lights for illuminating the work area inside the chamber, and two-point calibration for the relative humidity sensor. While relative humidity and fan rotational speed readings are displayed in real-time on the built-in user-friendly interface, the readings can also be recorded through a USB connection to a laptop or computer and the optional computer program. The design files, source code, and build instructions of the HumidOSH can be accessed at https://dx.doi.org/10.17605/OSF.IO/WCKHM.
Collapse
Affiliation(s)
- Soon Kiat Lau
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
- Department of Biological Systems Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
| | - Jeyamkondan Subbiah
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
- Department of Biological Systems Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
- Department of Food Science, University of Arkansas, Fayetteville, AR, USA
| |
Collapse
|
4
|
Wojtusik J, Stoops MA, Roth TL. Animal protein-free OptiXcell and shortened equilibration periods can replace egg yolk-based extender and slow cooling for rhinoceros semen cryopreservation. Cryobiology 2019; 89:21-5. [PMID: 31226254 DOI: 10.1016/j.cryobiol.2019.06.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 05/28/2019] [Accepted: 06/17/2019] [Indexed: 11/21/2022]
Abstract
OptiXcell (OP) was tested as an animal protein-free alternative to an egg yolk-based extender for rhinoceros semen cryopreservation and shorter chilling/equilibration periods were evaluated. Semen was collected from three rhinoceros species: black (Diceros bicornis; n = 2), white (Ceratotherium simum; n = 2), and greater one-horned (GOH; Rhinoceros unicornis; n = 3). Controls were diluted with equine extender (EQ) or OP and equilibrated for 1 h. Treatments were diluted with extender and cooled for 15 min (fast: FEQ; FOP) or not cooled (immediate: IEQ; IOP), prior to cryopreservation. Motility decreased post-thaw (EQ: 50.7 ± 5.2%; OP: 52.9 ± 3.4%) from fresh (82.9 ± 2.9%), was higher in OP than IOP (38.6 ± 4.9%; P ≤ 0.05) and decreased over time (P ≤ 0.05). Post-thaw acrosomal integrity was lower in EQ, FEQ, and IEQ (56.9 ± 0.7; 56.6 ± 4.5; 54.9 ± 2.9%) than OP, FOP, IOP (71.8 ± 4.7; 71.9 ± 3.8; 69.9 ± 4.5%) and fresh (72.6 ± 1.4%; P ≤ 0.05). Progression and viability were lower in EQ (2.8 ± 0.2; 61.9 ± 7.4%) and OP (3.1 ± 0.2; 53.4 ± 6.9%) than fresh (3.7 ± 0.2; 87.2 ± 1.3%), decreased over time (P ≤ 0.05) but not different among treatments (P > 0.05). Morphology did not differ between fresh (75.0 ± 4.9% normal) and any treatment group (70.0-77.8%) or over time (P > 0.05). OptiXcell is comparable to egg yolk-based EQ when used for rhinoceros semen cryopreservation. Furthermore, chilling/equilibration can be reduced with little impact on sperm characteristics.
Collapse
|
5
|
Wu G, Jia B, Quan G, Xiang D, Zhang B, Shao Q, Hong Q. Vitrification of porcine immature oocytes: Association of equilibration manners with warming procedures, and permeating cryoprotectants effects under two temperatures. Cryobiology 2017; 75:21-27. [PMID: 28283337 DOI: 10.1016/j.cryobiol.2017.03.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 03/05/2017] [Accepted: 03/05/2017] [Indexed: 11/18/2022]
Abstract
The aim of this study was to evaluate the association of equilibration manners with warming procedures, and the different permeating cryoprotectants (pCPAs) effects under two temperatures, in terms of survival, maturation and subsequent parthenogenetic development of porcine immature oocytes after Cryotop vitrification. In Experiment 1, oocytes were equilibrated by exposure to 5% (v/v) ethylene glycol (EG) for 10 min (EM1) or stepwise to 7.5% (v/v) and 15% (v/v) EG for 2.5 min respectively (EM2). Warming procedures were performed in 1.0 M sucrose for 1 min, then in 0.5 and 0.25 M sucrose for 2.5 min respectively (WP1), or in 0.5, 0.25 and 0.125 M sucrose each step for 2 min (WP2), or in 0.25, 0.125 and 0.063 M sucrose each step for 2 min (WP3). After 2 h of warming, the survival rate of oocytes treated by EM1 and WP1 was significantly higher (P < 0.05) than that of the other groups. Moreover, a similar proportion of survival and nuclear maturation in all vitrified groups was obtained after completion of the IVM. No significant difference in blastocyst development was observed among vitrified groups except the group treated by EM2 and WP3. In Experiment 2, oocytes were vitrified by using EG alone, EG combined with dimethyl sulphoxide (EG + DMSO) or propylene glycol (EG + PROH) as pCPAs under 25 °C and 39 °C. The percentages of cryosurvival and nuclear maturation were similar in all vitrified groups. Under 25 °C, the embryo development and total cell numbers of blastocysts were not significantly different among EG, EG + DMSO and EG + PROH groups. However, the application of EG + PROH at 39 °C resulted in significantly decreased both cleavage and blastocyst formation rates. In conclusion, our data showed that equilibration manner and warming procedure affect the cryosurvival of porcine immature oocytes, and the combination of pCPAs cannot give a better cryopreservation outcome whether 25 °C or 39 °C. Notably, the Cryotop vitrification accompanied by our modified strategy for porcine immature oocytes could achieve high survival and respectable blastocyst production.
Collapse
Affiliation(s)
- Guoquan Wu
- Yunnan Provincial Engineering Laboratory of Animal Genetic Resource Conservation and Germplasm Enhancement, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650224, People's Republic of China
| | - Baoyu Jia
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, Yunnan 650201, People's Republic of China
| | - Guobo Quan
- Yunnan Provincial Engineering Laboratory of Animal Genetic Resource Conservation and Germplasm Enhancement, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650224, People's Republic of China
| | - Decai Xiang
- Yunnan Provincial Engineering Laboratory of Animal Genetic Resource Conservation and Germplasm Enhancement, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650224, People's Republic of China
| | - Bin Zhang
- Yunnan Provincial Engineering Laboratory of Animal Genetic Resource Conservation and Germplasm Enhancement, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650224, People's Republic of China
| | - Qingyong Shao
- Yunnan Provincial Engineering Laboratory of Animal Genetic Resource Conservation and Germplasm Enhancement, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650224, People's Republic of China
| | - Qionghua Hong
- Yunnan Provincial Engineering Laboratory of Animal Genetic Resource Conservation and Germplasm Enhancement, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan 650224, People's Republic of China.
| |
Collapse
|
6
|
Malo C, Crichton EG, Skidmore JA. Optimization of the cryopreservation of dromedary camel semen: Cryoprotectants and their concentration and equilibration times. Cryobiology 2016; 74:141-147. [PMID: 27818266 DOI: 10.1016/j.cryobiol.2016.11.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 11/02/2016] [Accepted: 11/02/2016] [Indexed: 01/13/2023]
Abstract
Research into an optimal cryoprotectant, its concentration and equilibration time underlies the successful cryopreservation of dromedary camel spermatozoa. This study assessed the cryo-efficiency of different cryoprotectants, their concentration and equilibration time and any interactions. In experiment 1, semen samples (n = 4 males; 2 ejaculates/male) were frozen using Green Buffer containing one of four cryoprotectants (3% glycerol, ethylene glycol, methyl formamide, dimethyl sulfoxide) and using 4 equilibration times (10 min, 0.5, 1 and 2 h). Glycerol and ethylene glycol provided the best motility recovery rates and different equilibration times were not significant for any cryoprotectant nor were any interactions noted. However different equilibration times were pertinent for improved kinematic parameters BCF and VSL. In experiment 2, glycerol and ethylene glycol were evaluated at 4 concentrations (1.5, 3, 6, 9%) with 0.5 h equilibration (n = 4 males, 3 ejaculates/male). Sperm motility recoveries, kinematics and acrosome status were assessed. Higher values for LIN and STR were found with ethylene glycol. At 0 and 1 h post thaw 3 and 6% of either cryoprotectant resulted in better motility values than 1.5%. Acrosome integrity was compromised at 9% cryoprotectant. There were interactions between cryoprotectant and concentration in total motility at 0 and 1 h. For glycerol, total motility recoveries were best at 3-9%; for ethylene glycol 1.5-6% were best at 0 h and 3-6% at 1 h. In conclusion, 3-6% glycerol or ethylene glycol offered the best cryoprotection for camel sperm while different equilibration times were not critical.
Collapse
Affiliation(s)
- Clara Malo
- Camel Reproduction Centre, PO Box 79914, Dubai, United Arab Emirates.
| | | | - Julian A Skidmore
- Camel Reproduction Centre, PO Box 79914, Dubai, United Arab Emirates
| |
Collapse
|