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Substance P administration to neonatal rats increases adult sensitivity to substance P
Insights
Early exposure to Substance P (SP) in neonatal rats caused lasting changes in pain perception and salivary response. This suggests early peptide exposure can alter the development of systems sensitive to SP.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Substance P (SP) is a neuropeptide involved in various physiological processes.
- Neonatal development is a critical period sensitive to environmental and chemical exposures.
Purpose of the Study:
- To investigate the long-term physiological effects of neonatal Substance P (SP) exposure in rats.
- To determine how early-life SP administration impacts pain perception and autonomic responses.
Main Methods:
- Neonatal rats received daily subcutaneous injections of Substance P (SP) from days 1-7 postpartum.
- Subsequent physiological assessments evaluated pain perception, sialogogic response, and hypotensive response to SP.
Main Results:
- Neonatal SP exposure resulted in long-term alterations in pain perception.
- An increased sialogogic response to SP was observed in treated rats.
- The hypotensive response to SP remained unchanged compared to controls.
Conclusions:
- Early-life exposure to Substance P (SP) can induce lasting physiological changes in rats.
- These findings indicate that neonatal SP influences the development of systems sensitive to its effects, specifically pain and salivary pathways.
- The observed changes suggest a potential increase in system sensitivity to SP following early exposure.
Abstract:
Substance P (SP) administered subcutaneously to neonatal rats on days 1-7 after birth produced long-term physiological changes. The changes included altered pain perception and increased sialogogic response to SP, although the hypotensive response to SP was unchanged. Early exposure to the peptide therefore influenced development, particularly with respect to two systems in which SP is physiologically active. Both changes may reflect an increased sensitivity of these systems to the effects of SP.