In vitro indeterminate teleost myogenesis appears to be dependent on Pax3
- Authors
- Froehlich, J.M., Galt, N.J., Charging, M.J., Meyer, B.M., and Biga, P.R.
- ID
- ZDB-PUB-130502-9
- Date
- 2013
- Source
- In vitro cellular & developmental biology. Animal 49(5): 371-85 (Journal)
- Registered Authors
- Biga, Peggy R.
- Keywords
- myogenesis, zebrafish, giant danio, indeterminate growth, Pax3
- MeSH Terms
-
- Analysis of Variance
- Animals
- Cyprinidae/metabolism
- Cyprinidae/physiology*
- Gene Expression Regulation, Developmental/physiology*
- Immunohistochemistry
- Models, Animal*
- Muscle Development/physiology*
- Muscle, Skeletal/growth & development*
- MyoD Protein/metabolism
- Myogenic Regulatory Factor 5/metabolism
- Myogenin
- Myostatin
- Paired Box Transcription Factors/metabolism*
- Proto-Oncogene Proteins c-met/metabolism
- Syndecan-4/metabolism
- PubMed
- 23613306 Full text @ In Vitro Cell Dev. Biol. Anim.
The zebrafish (Danio rerio) has been used extensively as a model system for developmental studies but, unlike most teleost fish, it grows in a determinate-like manner. A close relative, the giant danio (Devario cf. aequipinnatus), grows indeterminately, displaying both hyperplasia and hypertrophy of skeletal myofibers as an adult. To better understand adult muscle hyperplasia, a postlarval/postnatal process that closely resembles secondary myogenesis during development, we characterized the expression of Pax3/7, c-Met, syndecan-4, Myf5, MyoD1, myogenin, and myostatin during in vitro myogenesis, a technique that allows for the complete progression of myogenic precursor cells to myotubes. Pax7 appears to be expressed only in newly activated MPCs while Pax3 is expressed through most of the myogenic program, as are c-Met and syndecan-4. MyoD1 appears important in all stages of myogenesis, while Myf5 is likely expressed at low to background levels, and myogenin expression is enriched in myotubes. Myostatin, like MyoD1, appears to be ubiquitous at all stages. This is the first comprehensive report of key myogenic factor expression patterns in an indeterminate teleost, one that strongly suggests that Pax3 and/or Myf5 may be involved in the regulation of this paradigm. Further, it validates this species as a model organism for studying adult myogenesis in vitro, especially mechanisms underlying nascent myofiber recruitment.