HISTOLOGY AND HISTOPATHOLOGY

Cellular and Molecular Biology

 

Review

The cellular homeostasis of the gut: what the Drosophila model points out

Matthieu Y. Pasco*, Rihab Loudhaief* and Armel Gallet

Sophia Agrobiotech Institute, UMR INRA 1355/CNRS 7254/Nice - Sophia Antipolis University, BP 167, 06903 Sophia Antipolis Cedex - France
*These authors contribute equally to this work

Offprint requests to: Armel Gallet, Institut Sophia Agrobiotech, UMR INRA 1355/CNRS 7254/Université Nice Sophia-Antipolis, 400 route des Chappes, BP 167, 06903 Sophia Antipolis Cedex, France. e-mail: gallet@unice.fr


Summary. The digestive tract is subjected to many aggressions throughout animal life. Since disruptions of gut physiology impact on animal fitness and survival, maintenance of gut integrity and functionality is essential for the individual. Over the last 40 years, research on rodents has aimed at understanding how cellular homeostasis of the digestive tract is maintained when challenged with disruptions. Following the discovery of stem cells in the digestive tract of Drosophila, a flurry of studies made an important contribution to our understanding of how the proliferation and the differentiation of these cells are controlled and participate in the renewal of the digestive tract. Insights into these mechanisms in Drosophila have revealed many similarities with mammalian intestinal stem cells. For instance, the highly conserved EGFR, JAK/STAT, Wingless/Wnt, Hedgehog, Integrins, BMP/TGF?, Hippo and Insulin pathways all participate in adult intestinal cellular homeostasis. Here, we provide a literature review of recent advances in the field highlighting the adult Drosophila midgut as a convenient model for dissecting mechanisms involved in the maintenance of the cellular homeostasis of the digestive tract in conventionally reared conditions. In addition, we shed light on recently published data putting Drosophila forward as a genetic tool to decipher the mechanisms underlying intestinal diseases and intestinal tumour progression. Histol Histopathol 30, 277-292 (2015)

Key words: Intestinal homeostasis, Stem cell maintenance, Symmetric and asymmetric division, Intestinal diseases, Cancers

DOI: 10.14670/HH-30.277