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Age-related changes in substance P and vasoactive intestinal polypeptide immunoreactivity in the rat stomach and

F Ferrante1, P Geppetti, F Amenta

  • 1Dipartimento di Scienze Cardiovascolari e Respiratorie, Università La Sapienza, Rome, Italy.

Archives of Gerontology and Geriatrics
|July 1, 1991
PubMed

Insights

Aging alters gastrointestinal neuropeptides. Substance P and vasoactive intestinal polypeptide levels change differently across rat digestive tissues with age, indicating distinct neuronal aging patterns.

Area of Science:

  • Neurogastroenterology
  • Aging Research
  • Gastrointestinal Physiology

Background:

  • Substance P (SP) and vasoactive intestinal polypeptide (VIP) are key neuropeptides in regulating gastrointestinal functions.
  • Aging is known to affect various physiological processes, including the nervous system and digestive tract.
  • Understanding age-related changes in neuropeptide expression is crucial for comprehending gastrointestinal aging.

Purpose of the Study:

  • To investigate the age-related changes in immunoreactivity of substance P (SP-LI) and vasoactive intestinal polypeptide (VIP-LI).
  • To compare neuropeptide levels in different segments of the gastrointestinal tract (stomach, duodenum, jejunum, ileum) across young, adult, and old rats.
  • To determine if aging affects different intrinsic gastrointestinal neuronal populations distinctly.

Main Methods:

  • Radioimmunoassay (RIA) was employed to quantify SP-LI and VIP-LI.
  • Samples were collected from the stomach, duodenum, jejunum, and ileum of male Wistar rats at three age groups: young (3 months), adult (12 months), and old (28 months).
  • Comparative analysis of neuropeptide levels between age groups and across different intestinal segments.

Main Results:

  • No significant changes in SP-LI and VIP-LI were observed in the stomach or small intestine of adult rats compared to young rats.
  • In old rats, SP-LI levels remained unchanged in the stomach and duodenum but decreased in the jejunum and increased in the ileum.
  • VIP-LI concentrations were unchanged in the stomach of old rats but were markedly reduced in the duodenum, jejunum, and ileum.

Conclusions:

  • Aging differentially affects various intrinsic gastrointestinal neuronal populations expressing SP and VIP.
  • The observed changes in neuropeptide levels suggest a complex and segment-specific impact of aging on the gut nervous system.
  • These findings highlight the heterogeneous nature of neuronal aging within the gastrointestinal tract.

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