Fibroblast growth factors in regenerating limbs ofAmbystoma: Cloning and semi-quantitative RT-PCR expression studies
| Autor: | Michael Weinstein, Roy A. Tassava, Randolph N. Christensen |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
medicine.medical_specialty
DNA Complementary animal structures Fibroblast Growth Factor 8 Molecular Sequence Data Fibroblast Growth Factor 4 Fibroblast growth factor Ambystoma Axolotl Ambystoma maculatum Proto-Oncogene Proteins biology.animal Internal medicine FGF4 medicine Animals Regeneration Limb development Amino Acid Sequence Cloning Molecular Ambystoma mexicanum biology Reverse Transcriptase Polymerase Chain Reaction Regeneration (biology) Extremities General Medicine biology.organism_classification Up-Regulation Cell biology Fibroblast Growth Factors body regions Endocrinology embryonic structures Salamander Animal Science and Zoology Fibroblast Growth Factor 10 |
| Zdroj: | Journal of Experimental Zoology. 290:529-540 |
| ISSN: | 1097-010X 0022-104X |
| DOI: | 10.1002/jez.1097 |
| Popis: | Urodele amphibians (newts and salamanders) have the ability to regenerate amputated limbs throughout their life span. Because fibroblast growth factors (Fgfs) play important roles in developing limbs, we initiated studies to investigate these growth factors in regenerating limbs. Partial cDNAs of Fgf4, 8, and 10 were cloned from both the Mexican axolotl, Ambystoma mexicanum, and locally collected spotted salamander, Ambystoma maculatum, two salamanders well recognized for their regenerative capabilities. cDNAs from the two Ambystoma species were virtually identical, ranging from 97-100% nucleotide identity. Axolotl Fgf4, 8, and 10 showed nucleotide sequence identity with chick Fgf4, 8, and 10 of 79%, 83%, and 72%, respectively. RT-PCR showed that these growth factors are expressed in regenerating axolotl limbs as well as in developing salamander larvae at the three-digit forelimb stage. Fgf8 and 10 are upregulated during regeneration and thus may be involved in distal signaling similar to that of the developing chick limb. Fgf4, however, was undetectable by RT-PCR in the distal tips of regenerates, suggesting that it does not play the same role in limb regeneration that it does in limb development. We also investigated the role these Fgfs may have in the nerve-dependence of regeneration. They were expressed similarly in aneurogenic and innervated limbs, suggesting that they are not the neurotrophic factors responsible for nerve-dependence. Denervation prevented Fgf8 and 10 upregulation, suggesting Fgf pathways are downstream of nerve-dependence. These data highlight important similarities and differences in Fgf expression between limb development and limb regeneration. J. Exp. Zool. 290:529-540, 2001. |
| Databáze: | OpenAIRE |
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