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Helospectin-like immunoreactivity in the esophagus
Regulatory Peptides
|August 13, 1992
Summary
Helospectin, a novel VIP-like peptide from lizard venom, is found in the esophagus of cats, sheep, and humans. Its distribution suggests a role in regulating esophageal motor and secretory functions.
Area of Science:
- Neuroscience
- Gastroenterology
- Peptide Research
Background:
- Helospectin I and II are VIP-like peptides from Heloderma horridum venom.
- Vasoactive intestinal peptide (VIP) is known to regulate gastrointestinal functions.
Purpose of the Study:
- To investigate the presence and distribution of helospectin-like immunoreactivity in the lower esophagus of different species.
- To determine the relationship between helospectin and other neuropeptides in the esophageal nervous system.
Main Methods:
- Immunocytochemistry was used to detect helospectin-like immunoreactivity in the lower esophagus of cats, sheep, and humans.
- Double immunostaining was performed to examine the coexistence of helospectin with VIP, neuropeptide Y, and substance P.
Main Results:
- Helospectin-immunoreactive nerve fibers and cell bodies were found in the muscle layers, submucosa, mucosa, and myenteric ganglia of all species studied.
- Helospectin coexists with VIP in nerve fibers and cell bodies throughout the lower esophagus.
- Helospectin also coexists with neuropeptide Y in nerve fibers surrounding smooth muscle.
- Substance P was found in a subpopulation of helospectin/VIP-containing fibers in cats and sheep, but not in humans.
Conclusions:
- The helospectin-immunoreactive material in the esophagus likely represents a novel neuropeptide.
- The distribution of VIP/helospectin-immunoreactive neurons and fibers suggests their involvement in regulating esophageal motor and secretory activities.