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1

In vitro embryo production in cattle ? technology and practical application

100%
Katska-Ksiazkiewicz L.
Biotechnologia
|
2004
|
issue 1
32-42
EN
Technology of bovine in vitro embryo production (IVP) had developed during the last few years to the level which allows its practical applications. Recently, IVP technology has been commercially used in several countries to increase the number of calves originating from donors of high genetic value. Combined with ovum pick-up technique (OPU), IVP technology serves as en alternative or integral method in breeding program MOET. The technology of IVP includes three developmental steps, i.e. oocyte in vitro maturation, in vitro fertilization and embryo culture. This review will focus on immature bovine oocyte recovery and selection, in vitro maturation, sperm processing, embryo culture to hatched blastocysts stage and factors affecting IVF efficiency. Moreover, recently developed investigations (IVP using calf oocytes and oocytes originating from small ovarian follicles) aiming to increase the effectiveness of IVP technology are discussed as well.
2

Long-term culture preantral and early antral ovarian follicles in mammals- perspectives and recent development

100%
Katska-Ksiazkiewicz L.
Biotechnologia
|
2003
|
issue 1
129-137
EN
The ovary of mammal contains thousands of oocytes enclosed in the preantral and early antral follicles. Since more than 99% of ovarian oocytes undergo atresia, it would be of great practical benefit if these follicles could be rescued by a long-term in vitro culture leading to provide an additional source of gametes and allowing for more efficient improvement of the reproductive potential of female. Until now, research on the isolated preantral follicles are the best developed in rodents. In mouse, investigations have led to follicle growth and antrum formation, ovulation in vitro and even to a few live kids after in vitro maturation and fertilization of the oocytes recovered from in vitro cultured preantral and even primordial follicles. Recently, some progress in the development of methods that allow obtaining competent oocytes and, after IVF, even blastocysts was shown in farm animals. However, only follicles with selected size can be utilized for these purposes. The successful results are encouraging for further development of methods for culture of preantral follicles in farm animals. In the article, techniques of follicle recovery, in vitro culture systems, methods for evaluation of oocyte growth, quality and competence for maturity and IVF including our impact in development of presented methods are discussed.
3

Bcl-2 proteins in ovarian apoptosis

63%
Opiela J., Katska-Ksiazkiewicz L.
Biotechnologia
|
2006
|
issue 1
90-96
EN
Members of the Bcl-2 family are considered principal players in the cascade of events that activate or inhibit apoptosis. Recent evidence strongly supports fundamental role of Bcl-2 and related proteins in regulating ovarian cell death. This article will provide an overview of the current knowledge regarding Bcl-2 proteins in programmed cell death in development of the ovary and the postnatal ovarian cycles.
4

Characterization of mammalian oocyte competence to undergo fertilization and embryonic development: I. Nuclear maturation and molecular aspects of its regulation

63%
Opiela J., Katska-Ksiazkiewicz L.
Biotechnologia
|
2004
|
issue 3
140-151
EN
Near the end of the growth phase, mammalian oocyte achieves competence to undergo three aspects of maturation, i.e. nuclear, cytoplasmic and genomic. All these processes are essential for the formation of an egg having the capacity for fertilization and development. This review will consider the aspects of molecular events during the process of nuclear maturation. Meiotic maturation of an oocyte is under the control of the cell cycle molecules, of which cAMP, MPF and MAP kinases seem to be the most important. The present findings regarding Ringo protein and cdc25b kinase as modulators of MPF activity and mechanism of MPF activation are discussed. Moreover, the roles of the FF-MAS, ribosomal S6 kinase p90rsk, POLO like kinases and the newly discovered proteins MISS and formin-2 are described.
5

Characterization of mammalian oocyte competence to undergo fertilization and embryonic development: II. Regulation of cytoplasmic and genomic maturation

63%
Opiela J., Katska-Ksiazkiewicz L.
Biotechnologia
|
2005
|
issue 2
151-162
EN
Near the end of the growth phase, mammalian oocyte achieves competence to undergo three aspects of maturation, i.e. nuclear, cytoplasmic and genomic. This review will consider some aspects of cytoplasmic and genomic maturation, as the nuclear maturation was already presented. The roles of the protein synthesis, bi-directional communication between oocyte and granulosa cells and calcium oscillations required for acquiring cytoplasmic maturation are discussed. The relevant information on genomic imprinting that causes functional differences between paternal and maternal genomes and plays an essential role in mammalian development is reviewed. Moreover, the present findings regarding oocyte-specific genes required for expression of cytoplasmic and genomic competencies are described.
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