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Related Experiment Videos

5-Hydroxytryptamine: a second diuretic hormone in Rhodnius prolixus.

S H Maddrell1, W S Herman, R L Mooney

  • 1Department of Zoology, Cambridge, England.

The Journal of Experimental Biology
|March 1, 1991
PubMed
Summary
This summary is machine-generated.

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This study shows that the hormone 5-hydroxytryptamine (5-HT) regulates fluid secretion in Rhodnius prolixus. Its levels increase after feeding, stimulating Malpighian tubule activity.

Area of Science:

  • Insect physiology
  • Endocrinology
  • Comparative physiology

Background:

  • The regulation of fluid secretion in insects is crucial for homeostasis.
  • Insect Malpighian tubules are analogous to vertebrate kidneys, playing a key role in excretion and ion balance.
  • Hormonal control of diuresis in Rhodnius prolixus involves both peptide hormones and potentially other signaling molecules.

Purpose of the Study:

  • To investigate the presence and role of 5-hydroxytryptamine (5-HT) in regulating Malpighian tubule fluid secretion in Rhodnius prolixus.
  • To determine if 5-HT acts as a diuretic hormone in this insect species.
  • To identify the presence of specific receptors for 5-HT on Rhodnius Malpighian tubules.

Main Methods:

  • Bioassays were performed on fifth-instar Rhodnius prolixus haemolymph using Calliphora salivary glands.

Related Experiment Videos

  • The effects of 5-HT on Malpighian tubule fluid secretion were measured in unfed and fed insects.
  • Specific 5-HT receptor antagonists, ketanserin and spiperone, were used to assess receptor involvement and selectivity.

    • Main Results:

    • Biologically active 5-hydroxytryptamine (5-HT) was detected in Rhodnius prolixus haemolymph.
    • In unfed insects, 5-HT levels were insufficient to stimulate Malpighian tubule fluid secretion.
    • Soon after feeding initiation, 5-HT levels rose sufficiently to stimulate rapid Malpighian tubule secretion.
    • Ketanserin and spiperone selectively and reversibly inhibited 5-HT-induced fluid secretion, confirming specific 5-HT receptors.

    Conclusions:

    • 5-hydroxytryptamine (5-HT) is a naturally occurring hormone in Rhodnius prolixus.
    • 5-HT plays a significant role in regulating diuresis in this species, acting in concert with a known peptide hormone.
    • Specific 5-HT receptors are present on the Malpighian tubules of Rhodnius prolixus, mediating the fluid secretion response.