Amniotic fluid: Source of trophic factors for the developing intestine

Abstract

The gastrointestinal tract (GIT) is a complex system, which changes in response to requirements of the body. GIT represents a barrier to the external environment. To achieve this, epithelial cells must renew rapidly. This renewal of epithelial cells starts in the fetal life under the influence of many GIT peptides by swallowing amniotic fluid (AF). Development and maturation of GIT is a very complex cascade that begins long before birth and continues during infancy and childhood by breast-feeding. Many factors like genetic preprogramming, local and systemic endocrine secretions and many trophic factors (TF) from swallowed AF contribute and modulate the development and growth of the GIT. GIT morphogenesis, differentiation and functional development depend on the activity of various TF in the AF. This manuscript will review the role of AF borne TF in the development of GIT.

Keywords: Amniotic; Fluid; Gastrointestinal; Factors; Tract; Trophic; Development

Core tip: The gastrointestinal tract (GIT) is a complex system with a combination of factors being responsible for its development. Trophic factors (TF) in amniotic fluid (AF) represent an important component that affects the development and maturation of the GIT during fetal life. We highlight the various phases of GIT development, the formation/circulation of AF, various TF in AF and the respective roles they play in fetal GIT development. We also emphasize that much remains to be known about the milieu of TF within AF. We hope this article provides an insight of what is known about such TF and what we hope to discover in the future.