Study summary · research use only
Characterization of a rabbit antihuman mechano growth factor (MGF) polyclonal antibody against the last 24 amino acids of the E domain
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
In this laboratory study using rabbits, human tissue, and rat tissue, the authors characterized a rabbit antihuman mechano growth factor (MGF) polyclonal antibody raised against the last 24 amino acids of the E domain. MGF is an IGF-1 splice-variant isoform reported as up-regulated in exercised or damaged muscle. New Zealand rabbits were immunized with a purified synthetic peptide corresponding to the last 24 amino acids of the human C-terminal MGF E domain, and the antiserum was characterized by Western blotting and immunohistochemistry. The abstract reports the antiserum recognized the MGF E-peptide but not the mature IGF-1 peptide, and bound MGF in human skeletal and rat cardiac muscle. The authors conclude the antibody could be a useful research tool.
Abstract
The human insulin-like growth factor-1 (IGF-1) gene gives rise to multiple, heterogeneous mRNA transcripts by alternative splicing, thus producing different IGF-1 isoforms. The mechano growth factor (MGF) is an IGF-1 isoform that was found to be markedly up-regulated in exercised or damaged muscle. The specific E domain of the MGF splice variant may act as an independent growth factor. The aim of the present study was to characterize a rabbit antihuman MGF polyclonal antibody. New-Zealand rabbits were immunized by injections of a purified synthetic peptide corresponding to the last 24 amino acids of the human C-terminal of the MGF E domain. Western blotting and immunohistochemical techniques were used to characterize the specificity of the polyclonal anti-MGF antiserum. The anti-MGF antiserum was found to recognize the MGF E-peptide and not the common part of the IGF-1 isoforms, i.e. the mature IGF-1 peptide. Furthermore, it specifically bound to the MGF protein in human skeletal and in rat cardiac muscle, apparently due to the considerable homology between the human and rat MGF E-peptide sequences. Immunostaining analysis showed that this polyclonal anti-MGF antibody was able to detect MGF in human muscle and in rat cardiomyocytes and vessels' smooth muscle cells. We conclude that this rabbit polyclonal anti-human/rat MGF antibody could become a valuable tool in the study of IGF-1 isoforms in human and rat tissues.
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