Antibodies in research of thymosin β4: investigation of cross-reactivity and influence of fixatives.

Annals of the New York Academy of Sciences2012PMID: 23050825

View on PubMed DOI: 10.1111/j.1749-6632.2012.06659.x

Plain Language Summary

Evaluates antibody specificity and fixative effects on thymosin β4 immunodetection, finding significant cross-reactivity with thymosin β10 and other beta-thymosin family members across commercially available TB4 antibodies. Formaldehyde fixation affected antibody-binding capability differently across antibody sources. Identifies a major technical caveat in the TB4 immunohistochemistry literature—raising concerns about whether some reported TB4 expression data actually reflects TB4 specifically versus other beta-thymosins—and providing guidance for reagent validation in TB4 tissue studies.

Abstract

Antibodies against thymosin β4 are available from various sources and have been used in immunohistochemistry, ELISA, and Western blot analyses. None of these antibodies have been fully characterized for specificity and influence of fixation techniques. This presents a difficulty because many tissues express more than one member of the β-thymosin family; in addition, highly homologous sequences are typical elements of β-thymosins. It is also important to scrutinize the influence of fixatives on the antibody-binding capability. Fixatives such as formaldehyde are well known as cross-linking reagents. Chemical modifications within the thymosin β4 molecule might change the putative epitope recognized by the antibody. These considerations suggest that investigations on thymosin β4 antibodies available to the scientific community are important and necessary before any experiment can be performed to exclude cross-reactivity with other β-thymosins that are coexistent in the examined tissue and to prove antibody binding after fixation steps.

Authors

Knop, Jana; App, Christine; Hannappel, Ewald