A Review of In Vitro Culture Systems in Bovine Reproductive Biotechnologies
Published Date: April 11, 2016
A Review of In Vitro Culture Systems in Bovine Reproductive Biotechnologies
Department of Reproduction and Artificial Insemination, University of Cumhuriyet, Sivas, Turkey
Corresponding author: Alper Kocyigit, Department of Reproduction and Artificial Insemination, University of Cumhuriyet, Sivas, Turkey, Tel: 903-462-191-010; Fax: 903-462-191-110; E-mail: firstname.lastname@example.org
Citation: Kocyigit A (2016) A Review of In Vitro Culture Systems in Bovine Reproductive Biotechnologies. J Vet Res Ani Husb 1(1): 101.
In vitro embryo production (IVP) is currently one of the most important biotechnologies in cattle breeding and husbandry. In vitro embryo technologies have enabled the production in large numbers of embryos of superior breeds in various livestock animals and allows for embryo transfer at low costs. Improvement of in vitro culture systems are important for production of embryos with high developmental competence that are used in embryo transfer programs. Even with the advancements of culture procedures, in vitro produced embryos, it usually shows low viability than developed in vivo counterparts. Furthermore, IVP embryos are more sensitive to cryoinjury than in vivo-derived embryos. with the number of bovine embryos transferred worldwide increasing annually, there is a greater need than ever to optimize conditions of embryo culture in vitro to maximize embryo quality, cryotolerance, and pregnancy rate. This review provides an overview of in vitro culture systems in bovine reproductive biotechnologies.
Keywords: Bovine; Embryo Production; Culture Systems
In vitro embryo technologies have enabled the production in large numbers of embryos of superior breeds in various livestock animals and allows for embryo transfer at low costs  (Figure 1). They have also enabled the production of embryos for scientific research purposes from slaughtered or live animals. Although several decades of research have gone into in vitro culture conditions that promote the maximal embryo yield are yet to be standardized [3-5]. In vitro embryo culture systems depend on multiple parameters such as the composition of culture media and gases . An efficient culture system for in vitro embryo development should be formulated to protect from intracellular stress and include all demands of the embryo thereby embryo can maintain viability. Various approaches have been employed to improve the culture systems of bovine embryos in vitro. The plurality of research toward improving embryo development in vitro has focused on culture composition, soluble chemicals and surrounding medium components [7,8]. Although with the advancements of culture procedures, in vitro produced embryos are usually shows low viability than developed in vivo counterparts. Furthermore, IVP embryos are more sensitive to cryoinjury than in vivo-derived embryos, such as shown by lower cell numbers, less compaction and a lower number of tight-junctions compared to embryos in vivo [9,10]. This review provides an overview of in vitro culture systems in bovine reproductive biotechnologies.
Figure 1: Worldwide in vivo and in vitro bovine embryo production between 1997 and 2013 .
There are several treatises on the composition of embryo culture media and the role of specific medium components in supporting mammalian embryo development in vitro. It is essential to appreciate that the culture media are only one part of the overall culture system. Optimal culture media for embryo production appear to require a combination of various factors such as hormones, cytokines, growth factor, antioxidants, vitamins, enzymes and macromolecules [11-17]. The formulations of culture media are a key aspect of embryo culture  (Table 1).
Table 1: Supplementation with embryotrophic factors towards improving defined media .
The most common media used in those culture systems are SOF (synthetic oviduct fluid), KSOM, and CR1aa; nevertheless, other media, such as G1.1/G2.2, CR2aa, and TCM199, can also be used. To date there are different culture systems available for in vitro fertilized oocytes. They can be classified according to their formulation as follows: undefined, where serum or/and co-culture are used; semi-defined, where co-culture is omitted and serum is replaced by albumin; or fully defined, a protein-free system where albumin is replaced by macromolecules such as polyvinyl alcohol and polyvinyl pyrrolidone [29,30].
Due to changes in the embryo’s requirements during growth, the use of culture media with formulations more similar to secretions found at different sites of the reproductive tissue. Sequential media have been developed to respond to the variable requirements of developing embryos.
Static or sequential systems require picking up and placing individual embryos several times. Embryos have been cultured on multiple configurations such as plastic polymers, petri dishes, and test tubes . Additionally, this culture system seems not necessary since a single culture media support a full-term embryo development, and the extra manipulation of embryos associated with changing of media could be harmful [32,33].
Microdrops: The micro system involves the combination of a small incubation volume and a great volume around the embryo. In essence, the embryos create a micro-environment to retain embryotrophic growth factors, while still allowing small molecules to rapidly diffuse throughout the larger volume [30,34].
Microdrops have long been the approach used to restrict embryos to a small area to take advantage of the potential benefit of trophic factors . Volumes of these drops typically range from; 10 to 50 µl, though some may be less and can be utilized with group as well as individual embryo culture. These low volumes and high embryo density culture approaches require high attention to medium properties because shifts in pH and osmolality are common and can have a profound impact on embryo development . Microdrop dishes are now available to reduce this concern of embryo displacement, and they may be beneficial in some laboratories for embryo development by facilitating manipulation of the embryos during handling [31,35].
Microwells: This approach attempts to create a microenvironment in the immediate periphery of individual or small groups of embryos and offers a means of potentially increasing surface area point-of-contact and decreasing spacing between embryos . Perhaps the most well-known microwell approach is the well-of-the-well (WOW) system . The WOW system has been used successfully with embryos from a variety of species using small impressions of varying sizes and arrangements placed into the bottom of a dish [31,37].
In vivo, the developing embryo migrates from the oviduct to the uterine lumen where the fluid composition and gas atmosphere are likely different . Due to changes in the embryo’s requirements during migrates, the use of sequential culture media with various formulations. Therefore, static culture systems require picking up and placing individual embryos several times. Microfluidic systems, could eliminate most of this labor intensive handling and more importantly. Microfluidic systems allow a gradual alteration of culture media, offers a potential of automation, improved handling and possibly improves efficiencies through a reduction in environmental stress [31,38]. Embryos can be moved from one location to another, simulating the oviduct and uterine environments, by adjusting the fluid flow [30,38,39].
A dynamic culture system also provides a controlled opportunity to furnish embryos with a continually refreshed supply of new nutrients and removal of waste products .
Perfusion systems: The perfusion system is a concept for a continuous flow system for pre-implantation embryo culture, which has been tested in bovine embryo culture . This system is oil-free with various advantages such as reduced exposure of media components to incubator and possibility of addition or removal of particular components at specific times during culture . Its introduction in bovine embryo production techniques is still limited and might be due to its cost and availability of suitable equipment  (Table 2). Microfluidic perfusion technology is progressing rapidly as it seems that arduous is the only limiting factor when designing microfluidic devices .
Table 2: Classification of mammalian embryo culture systems  (+ = low, ++++ = high; PrC = Pre-compaction; PC = Post-compaction).
Microfluidic systems can be proffer as micro scale perfusion systems that have the ability to operate over long periods with very little manipulation required [34,35]. We were able to produce an automated dynamic culture system for embryos that was not reliant on interconnections, which are historically known to make microfluidic systems complicated and for practical use. Further details of the system can be obtained in the original manuscript .Come in view novel technologies such as microfluidics may provide further advances for producing high quality embryos in vitro before transfer to improve the possibility of high birth rates .
In vitro produced embryos are still less developmentally competence than their in vivo counterparts. There is an increased awareness of the stamina requirements at several stages of embryo development and the different requirements for achieving optimal rates of development. Although much can be learned from embryo culture systems that provide important insights, completely defined and optimized media is the goal . Recent developments in culture systems and the potential to improve assisted reproductive technologies have been comprehensively reviewed by Smith et al . Microfluidic dynamic systems and novel devices and platforms may offer a pathway toward improving IVP embryo viability within the laboratory in the future [31,46]. With the number of bovine embryos transferred worldwide increasing annually, there is a greater need than ever to optimize conditions of embryo culture systems to maximize viability, cryotolerance and pregnancy rate.
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Copyright: © 2016 Kocyigit A. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.