Evaluation of 29 monoclonal and polyclonal antibodies used in the diagnosis of pituitary adenomas. A collaborative study from pathologists of the Club Fran?ais de l'Hypophyse |
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Authors: | F Labat-Moleur J Trouillas D Seret-Begue M Kujas M B Delisle C Ronin |
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Institution: | Laboratoire de Pathologie Cellulaire, H?pital Albert Michallon, Grenoble. |
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Abstract: | Fifteen polyclonal antibodies (pAbs) and 14 monoclonal antibodies (mAbs) directed against hGH, hPRL, beta hFSH, beta hLH, beta hTSH and alpha-subunit were assessed by five different laboratories on normal and adenomatous pituitary tissues. This study aims at providing pathologists with a selected panel of antisera suitable for diagnosis, and appreciating the interest of the recently introduced mAbs. All the anti-hGH Abs proved to be specific (3 pAbs and 4 mAbs); three mAb out of four gave a few false-negative reactions. Three out of six polyclonal anti-hPRL showed cross-reactivity with hGH; anti-hPRL mAbs gave a strong staining with no false-negativity detected so far. MAbs proved to be more efficient for detecting glycoprotein hormones and alpha subunit than pAbs, which, in several cases, gave widespread cross-reactivity. This lack of specificity could explain the noticeable discrepancies reported so far in the appraisal of gonadotropic and somatoprolactinic adenomas. |
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