ZFIN ID: ZDB-PUB-111122-8
Sexually Dimorphic Fin Regeneration in Zebrafish Controlled by Androgen/GSK3 Signaling
Nachtrab, G., Czerwinski, M., and Poss, K.D.
Date: 2011
Source: Current biology : CB   21(22): 1912-7 (Journal)
Registered Authors: Nachtrab, Greg, Poss, Kenneth D.
Keywords: none
Microarrays: GEO:GSE31871
MeSH Terms:
  • Androgens/metabolism*
  • Animal Fins/physiology*
  • Animals
  • Female
  • Glycogen Synthase Kinase 3/genetics
  • Glycogen Synthase Kinase 3/metabolism*
  • Insulin-Like Growth Factor Binding Protein 2/genetics
  • Insulin-Like Growth Factor Binding Protein 2/metabolism
  • Intercellular Signaling Peptides and Proteins/genetics
  • Intercellular Signaling Peptides and Proteins/metabolism
  • Male
  • Molecular Sequence Data
  • Receptors, Androgen/genetics
  • Receptors, Androgen/metabolism
  • Regeneration*
  • Sex Characteristics
  • Sexual Maturation
  • Signal Transduction*
  • Zebrafish/genetics
  • Zebrafish/physiology*
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism
PubMed: 22079110 Full text @ Curr. Biol.
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ABSTRACT

Certain fish and amphibians regenerate entire fins and limbs after amputation, whereas such potential is absent in birds and limited in mammals to digit tips [ [1] and [2] ]. Additionally, regenerative success can change during life stages. Anuran tadpoles gradually lose the capacity to regenerate limbs [ [3] and [4] ], and digit regeneration occurs more effectively in fetal mice and human children than adults [ [5] , [6] , [7] and [8] ]. Little is known about mechanisms that control regenerative capacity. Here, we identify an unexpected difference between male and female zebrafish in the regenerative potential of a major appendage. Males display regenerative defects in amputated pectoral fins, caused by impaired blastemal proliferation. This regenerative failure emerges after sexual maturity, is mimicked in androgen-treated females, and is suppressed in males by androgen receptor antagonism. Androgen signaling maintains expression of dkk1b and igfbp2a, which encode secreted inhibitors of Wnt and Igf signaling, respectively. Furthermore, the regulatory target of Wnts and Igfs, GSK3β, is inefficiently inactivated in male fin regenerates compared with females. Pharmacological inhibition of GSK3 in males increases blastemal proliferation and restores regenerative pattern. Our findings identify a natural sex bias in appendage regenerative capacity and indicate an underlying regulatory circuit in which androgen locally restricts key morphogenetic programs after amputation.

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