Transforming growth factor-alpha and epidermal growth factor expression in human fetal gastrointestinal tract.

Abstract:

:Epidermal growth factor (EGF) and transforming growth factor-alpha (TGF-alpha) are mitogenic to the intestinal epithelium. To further clarify their role in the developing human fetal gut, their expression was studied in fetuses at 15 to 20 wk of gestation. TGF-alpha mRNA was present throughout the gastrointestinal tract, most abundantly in the duodenum. EGF mRNA could be detected only with ribonuclease protection assay and reverse transcription-polymerase chain reaction analysis. The effect of EGF and TGF-alpha on TGF-alpha mRNA expression was studied by culturing explants of fetal jejunum, ileum, and colon for 7 d in Leibowitz L-15 medium supplemented with 100 micrograms/L of either EGF or TGF-alpha. EGF receptor-like immunoreactivity was detected in both the villi and the crypts. In the jejunum, exogenous EGF up-regulated TGF-alpha mRNA 3-fold. However, exogenous TGF-alpha reduced its own mRNA by 40%. No mature 6-kD TGF-alpha was detected in the culture medium by Western blotting, but precursor forms of approximately 30 and 68 kD were present. The ileum and colon did not respond to either growth factor. Besides the gut, TGF-alpha was expressed in the gallbladder, salivary gland, adrenals, brain, kidney, liver, and placenta. The data imply an important role for TGF-alpha and EGF in the developing intestine.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Miettinen PJ

doi

10.1203/00006450-199305000-00012

subject

Has Abstract

pub_date

1993-05-01 00:00:00

pages

481-6

issue

5

eissn

0031-3998

issn

1530-0447

journal_volume

33

pub_type

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