Mechano-sensory organ regeneration in adults: The zebrafish lateral line as a model

• Published in: Molecular and cellular neuroscience Vol. 33; no. 2; pp. 180 - 187
• Main Authors: Dufourcq, Pascale, Roussigné, Myriam, Blader, Patrick, Rosa, Frédéric, Peyrieras, Nadine, Vriz, Sophie
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.10.2006; Elsevier
• Subjects: Animal Structures - cytology; Animal Structures - innervation; Animal Structures - physiology; Animals; Biomarkers; Cell Division - physiology; Danio rerio; Life Sciences; Models, Animal; Nerve Regeneration - physiology; Neurons and Cognition; Sensory Receptor Cells - cytology; Sensory Receptor Cells - physiology; Zebrafish - physiology
• ISSN: 1044-7431; 1095-9327
• DOI: 10.1016/j.mcn.2006.07.005

In this report, we present a study of regeneration of the lateral line, a collection of mechano-sensory organ, in the adult zebrafish caudal fin. As all neuromasts are innervated by axon fibers, neuronal regeneration is a key issue in the regenerating process. We first show that support cells from the last neuromast adjacent to the amputation plane divide and migrate to colonize the blastema in order to reform the missing part of the lateral line. We then show that nerve re-growth takes place later than neuromast progenitor cell migration. We also provide evidence that new growth cones form at the amputation plane and subsequently follow the migrating placode-like structure to re-innervate regenerated neuromasts as they differentiate. Altogether, our observations indicate that caudal lateral line regeneration is not a mere recapitulation of the ontogenic process.