The zebrafish is a vertebrate animal that can regenerate several adult tissue types. These include well-studied structures such as fins, heart and eyes, but also poorly studied ones, such as the whisker-like facial barbels. The zebrafish maxillary barbel (ZMB) contains skin cells, glands, taste buds, connective tissues, nerves, and vascular components. Because the transparent barbells are external, all of the differentiated cell types within are visible and experimentally accessible. Barbels are known to regenerate in other species of fishes, but have not been studied for this capacity in zebrafish. Based on studies to date, we hypothesize that Wnt signaling molecules and glypican co- receptors are critical for both ZMB outgrowth and regeneration after injury. In our first aim, we will document patterns of cell division and cell death during development and regeneration of this appendage, and confirm the existence and function of the barbel lymphatics, which we are the first to describe. In the second aim, we will 1) map the spatial and temporal resolution of non-canonical Wnt ligands and receptors (glypicans and frizzleds) in ZMB tissue, 2) use transgenic fish to test if restoring glypican function restores ZMB outgrowth in a zebrafish mutant, 3) survey if canonical Wnt signaling is required for ZMB budding and regeneration, and 4) test candidate genes in the ZMB using a morpholino approach. Knowledge gained from these investigations will contribute significantly to our understanding of the genetic interactions involved in the development and maintenance of skin and skin appendages. Because the ZMB is an adult organ that regenerates, this study will also illuminate the response to injury of many terminally differentiated cell types, including blood vessels, lymphatics and nerves. Unlike regeneration in the zebrafish caudal fin, regeneration in the ZMB is characterized by abnormal cell proliferation and extracellular matrix deposition, a process that may be relevant to vertebrate wound healing pathologies such as keloids and/or hypertrophic scars. The ability of zebrafish barbel nerves to regrow axons to their taste bud targets may suggest approaches to restore peripheral sensation to traumatized tissues. Finally, the availability within the ZMB of both a capillary loop and a large, accessible lymphatic is an attractive system in which to study the physiological and pathological functions of the vasculature, including fluid balance and tumor metastasis. )

Public Health Relevance

This study will establish the biological potential of a novel, easily accessible and relatively non-intrusive system for studying skin appendage development and regeneration in the zebrafish, Danio rerio. Because all vertebrates share many genes in common, findings from this project are expected to relate to the cellular mechanisms of wound healing/scarring, revascularization and nerve regeneration in the adult tissues of other species, such as rodents or humans. The 3-year project will provide undergraduates at our institution with a comprehensive training program in zebrafish genetics, molecular biology and cellular regeneration, all vital skills for the next generation of biomedical professionals.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Academic Research Enhancement Awards (AREA) (R15)
Project #
1R15HD064169-01A1
Application #
8035683
Study Section
Development - 1 Study Section (DEV1)
Program Officer
Mukhopadhyay, Mahua
Project Start
2011-03-01
Project End
2014-11-28
Budget Start
2011-03-01
Budget End
2014-11-28
Support Year
1
Fiscal Year
2011
Total Cost
$418,815
Indirect Cost
Name
De Paul University
Department
Biology
Type
Schools of Arts and Sciences
DUNS #
045694130
City
Chicago
State
IL
Country
United States
Zip Code
60604
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Binelli, Erica A; Luna, Alejandra N; LeClair, Elizabeth E (2014) Anatomy and ontogeny of a novel hemodynamic organ in zebrafish. Anat Rec (Hoboken) 297:2299-317
Duszynski, Robert J; Topczewski, Jacek; LeClair, Elizabeth E (2013) Divergent requirements for fibroblast growth factor signaling in zebrafish maxillary barbel and caudal fin regeneration. Dev Growth Differ 55:282-300
Moore, Alex C; Mark, Tiffany E; Hogan, Ann K et al. (2012) Peripheral axons of the adult zebrafish maxillary barbel extensively remyelinate during sensory appendage regeneration. J Comp Neurol 520:4184-203
Duszynski, Robert J; Topczewski, Jacek; LeClair, Elizabeth E (2011) Simple, economical heat-shock devices for zebrafish housing racks. Zebrafish 8:211-9