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Regulating the activity of a cardioacceleratory peptide
R Nichols1, S Kaminski, E Walling
1Department of Biological Chemistry, University of Michigan, Ann Arbor 48109-1048, USA. nicholsr@umich.edu
Peptides
|November 26, 1999
Summary
Crustacean cardioactive peptide significantly impacts Drosophila heart rate across all life stages. This peptide
Area of Science:
- * Cardiovascular physiology
- * Neuroendocrinology
- * Developmental biology
Background:
- * Cardioactive peptides play crucial roles in regulating heart function.
- * Understanding invertebrate cardiac signaling provides insights into conserved physiological mechanisms.
Purpose of the Study:
- * To investigate the effects of crustacean cardioactive peptide (CCAP) on Drosophila melanogaster heart rate.
- * To determine if CCAP's cardiac effects differ between in vivo and in vitro preparations.
- * To assess developmental regulation of CCAP's cardiac signaling in Drosophila.
Main Methods:
- * Measurement of Drosophila heart rate in whole animals (in vivo).
- * Assessment of isolated Drosophila heart tissue preparations (in vitro).
- * Quantification of heart rate changes in response to CCAP across larval, pupal, and adult stages.
Main Results:
- * CCAP induced modest increases in in vivo heart rate (1-19%) across life stages.
- * In vitro, CCAP caused substantial increases in heart rate (25-52%) in larvae, pupae, and adults.
- * A subsequent decrease in heart rate was observed in vitro after CCAP application (13-42%).
Conclusions:
- * Drosophila CCAP cardiac signaling is modulated and exhibits developmental regulation.
- * In vitro preparations reveal a more pronounced effect of CCAP on heart rate compared to in vivo.
- * The biphasic response (acceleration followed by deceleration) suggests complex regulatory mechanisms.