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Antisense oligodeoxynucleotide complementary to oxytocin mRNA blocks lactation in rats
T Skutella1, J C Probst, J D Caldwell
1Department of Neuroendocrinology, Max-Planck-Institute of Psychiatry, Munich, Germany.
Summary
Antisense oligodeoxynucleotides (ODN) reduced oxytocin (OT) expression in lactating rats. This manipulation led to decreased pup weight, demonstrating the effectiveness of central ODN infusions for in vivo gene silencing.
Area of Science:
- Neuroendocrinology
- Molecular Biology
- Reproductive Biology
Background:
- Oxytocin (OT), a posterior pituitary peptide, regulates crucial functions including lactation, parturition, and maternal behaviors.
- Understanding OT's role necessitates methods to precisely modulate its expression in vivo.
Purpose of the Study:
- To investigate the efficacy of antisense oligodeoxynucleotides (ODN) in reducing oxytocin (OT) mRNA and peptide levels in the central nervous system of lactating rats.
- To assess the impact of reduced OT expression on physiological outcomes, specifically pup weight.
Main Methods:
- Lactating rats received intracerebroventricular injections of antisense ODN targeting OT mRNA.
- Treatment involved 6 doses administered at 12-hour intervals.
- OT immunoreactivity was measured in hypothalamic nuclei and the posterior pituitary.
- Control groups included scrambled ODN and vehicle administration.
Main Results:
- Antisense ODN treatment significantly reduced OT immunoreactivity in the hypothalamus and posterior pituitary compared to controls.
- A notable decrease in pup weight was observed in pups of dams treated with antisense ODN.
- These findings confirm successful in vivo manipulation of OT expression.
Conclusions:
- Central administration of antisense ODN is an effective strategy for downregulating oxytocin expression in the brain.
- Oxytocin plays a significant role in supporting pup growth during lactation.
- This study validates antisense ODN as a tool for studying neuropeptide function in vivo.