Role of insulin-like growth factor-I in esophageal mucosal healing processes

M. T. Tchorzewski, F. G. Qureshi, M. D. Duncan, K. L.K. Duncan, N. Saini, J. W. Harmon

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The current study examines the stimulation of healing processes and signal transduction that is mediated by insulin-like growth factor-I (IGF-I) in an ex viva esophageal explant model when using tyrphostin inhibition of receptor tyrosine kinase. The explant model provides a 3-dimensional cellular environment of multiple interacting cells isolated from the neural and vascular supply. Tyrphostins previously characterized for their interactions with epithelial growth factor (EGF) receptor-associated protein tyrosine kinases were tested for their potential effects on IGF-I growth-promoting activity. Explants of rabbit esophagus were incubated in media with or without IGF-I. Tyrphostins 1, 23, 25, 46, 47, 51, and 63 were added. We assessed DNA synthesis by tritiated thymidine incorporation. Outgrowth from the edge of the primary mucosa of the explant was evaluated on histologic sections, and cell proliferation was confirmed with immunohistology. IGF-I increased the incorporation of tritiated thymidine by 50% to 100%. Tyrphostins 23 and 47 eliminated IGF-I-induced proliferation in a dose-dependent manner. Tyrphostins 25, 46, and 51 - along with negative controls tyrphostin 1 and tyrphostin 63 - were ineffective, inasmuch as IGF-I-stimulated growth remained unchanged in their presence. Proliferative activity demonstrated by PCNA staining was confined to new mucosa. Two of 5 tyrphostins originally developed as EGF receptor protein tyrosine kinase inhibitors were effective in inhibiting the actions of exogenous IGF-I. We conclude that IGF-I stimulation may play an important role in repair processes in the esophagus and that this stimulation can be inhibited by using specific tyrphostins.

Original languageEnglish (US)
Pages (from-to)134-141
Number of pages8
JournalJournal of Laboratory and Clinical Medicine
Volume132
Issue number2
DOIs
StatePublished - Jan 1 1998

Fingerprint

Tyrphostins
Insulin-Like Growth Factor I
Receptor Protein-Tyrosine Kinases
Growth Factor Receptors
Thymidine
Esophagus
Mucous Membrane
Signal transduction
Proliferating Cell Nuclear Antigen
Cell proliferation
Protein Kinase Inhibitors
Protein-Tyrosine Kinases
Blood Vessels
Signal Transduction
Repair
Cell Proliferation
Staining and Labeling
Rabbits
DNA
Growth

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

Role of insulin-like growth factor-I in esophageal mucosal healing processes. / Tchorzewski, M. T.; Qureshi, F. G.; Duncan, M. D.; Duncan, K. L.K.; Saini, N.; Harmon, J. W.

In: Journal of Laboratory and Clinical Medicine, Vol. 132, No. 2, 01.01.1998, p. 134-141.

Research output: Contribution to journalArticle

Tchorzewski, M. T. ; Qureshi, F. G. ; Duncan, M. D. ; Duncan, K. L.K. ; Saini, N. ; Harmon, J. W. / Role of insulin-like growth factor-I in esophageal mucosal healing processes. In: Journal of Laboratory and Clinical Medicine. 1998 ; Vol. 132, No. 2. pp. 134-141.
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