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Polyamines inhibit apoptosis in porcine parthenotes developing in vitro
Xiang-Shun Cui1, Nam-Hyung Kim
1Department of Animal Sciences, Chungbuk National University, Gaesin-dong, Chungju, Chungbuk, South Korea.
Molecular Reproduction and Development
|February 3, 2005
Summary
Exogenous polyamines, such as putrescine, spermidine, and spermine, enhance porcine parthenote viability by reducing apoptosis. Their combined addition improved embryo development and cell numbers in vitro.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Biochemistry
Background:
- Polyamines (putrescine, spermidine, spermine) are crucial for cell growth and proliferation.
- Understanding polyamine roles in early embryonic development is vital for improving assisted reproductive technologies.
Purpose of the Study:
- To investigate the impact of exogenous polyamines on the in vitro viability and development of porcine diploid parthenotes.
- To analyze the effects of polyamines on apoptosis and gene expression related to cell survival and polyamine synthesis.
Main Methods:
- Porcine 2-cell diploid parthenotes were cultured in vitro with individual or combined polyamines (putrescine, spermidine, spermine).
- Developmental rates to blastocyst, total cell numbers, and apoptosis levels were assessed.
- Real-time PCR was used to evaluate mRNA expression of apoptosis-related genes (Bak/Bcl-xL, Fas/Bcl-xL, caspase 3) and polyamine biosynthesis enzymes (ODC, spermidine synthase).
- The effects of ODC and spermidine synthase inhibitors were also examined.
Main Results:
- Individual polyamine addition did not improve blastocyst development or cell count.
- Combined polyamine supplementation significantly increased blastocyst developmental rates and total cell numbers.
- Exogenous polyamines reduced apoptosis in blastocyst-stage parthenotes.
- Polyamines decreased mRNA expression of Bak/Bcl-xL, Fas/Bcl-xL, and caspase 3, while increasing ODC and spermidine synthase expression.
- Inhibitors of polyamine synthesis reduced parthenote development, increased apoptosis, and upregulated pro-apoptotic gene expression.
Conclusions:
- Exogenous polyamines, particularly when combined, enhance porcine parthenote viability by suppressing apoptosis.
- Polyamines modulate the expression of key genes involved in apoptosis and their own biosynthesis pathways.
- These findings suggest a critical role for polyamines in supporting early embryonic development in vitro.