Lack of neurokinin-1 receptor expression affects tissue mast cell numbers but not their spatial relationship with nerves

Michael R. D'Andrea, Marcia R. Saban*, Norma P. Gerard, Barry K. Wershil, Ricardo Saban

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A spatial association between mast cells and nerves has been described in both the gastrointestinal and genitourinary tracts. However, the factors that influence the anatomic relationship between mast cells and nerves have not been completely defined. It has been suggested that the high-affinity receptor for substance P [neurokinin-1 (NK1)] might modulate this interaction. We therefore assessed mast cell-nerve relationships in tissues isolated from wild-type and NK1 receptor knockout (NK1-/-) mice. We now report that, in the complete absence of NK1 receptor expression, there is a significant increase in the number of mast cells without a change in the anatomic relationship between mast cell and nerves in stomach and bladder tissues at the light microscopic level. We next determined whether transplanted mast cells would maintain their spatial distribution, number, and contact with nerve elements. For this purpose, mast cell-deficient Kit W/KitW-ν mice were reconstituted with wild-type or NK1-/- bone marrow. No differences in mast cell-nerve contact were observed. These results suggest that NK1 receptor expression is important in the regulation of the number of mast cells but is not important in the interaction between mast cells and nerves. Furthermore, the interaction between mast cells and nerves is not mediated through NK1 receptor expression on the mast cell. Further studies are needed to determine the molecular pathway involved in mast cell migration and interaction with nerve elements, but the model of reconstitution of KitW/Kit W-ν mice with mast cells derived from different genetically engineered mice is a useful approach to further explore these mechanisms.

Original languageEnglish (US)
Pages (from-to)R491-R500
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume288
Issue number2 57-2
DOIs
StatePublished - Feb 2005

Keywords

  • Cystitis
  • Disease animal model
  • Substance P

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Fingerprint Dive into the research topics of 'Lack of neurokinin-1 receptor expression affects tissue mast cell numbers but not their spatial relationship with nerves'. Together they form a unique fingerprint.

Cite this