Method for measuring metaplastic changes of mucus secreting...

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G01N 33/68 (2006.01) G01N 33/15 (2006.01) G01N 33/48 (2006.01) G01N 33/50 (2006.01) G01N 33/52 (2006.01)

Patent

CA 2171477

A method for the rapid estimation of hyperplastic and hypertropic changes in animal airways is an assay which specifically measures acidic and neutral mucoproteins in a linear fashion from 0.5 µg to at least 10 µg. The assay comprises exposure of a test animal to a suspected metaplastic inducer, removal of the lungs, homogenization in an appropriately buffered solution containing reducing agents and protease inhibitors removal of particulate matter, and size-fractionation of the SDS treated soluble extract. The high molecular weight material is immobilized and stained for either acidic or neutral mucosubstances and the specific staining is quantitated. The changes observed are consistent with those seen in histological sections of the exposed tissues. The assay is useful in confirming the metaplastic potential of suspected compounds, in determining what neurohumoral mediator(s) are involved in mucus cell metaplasia in animal models for chronic obstructive pulmonary disease, and in identifying compounds which might ameliorate these effects.

Méthode rapide d'évaluation chez l'animal des modifications de nature hyperplasique ou hypertrophique des voies respiratoires à l'aide d'un test spécifique de mesure des mucoprotéines acides ou neutres en mode linéaire de 0,5 mu g à 10 mu g. Le test consiste à soumettre le cobaye à un inducteur métaplasique suspecté, à prélever les poumons, à les homogénéiser dans une solution convenablement tamponnée contenant des agents réducteurs et des inhibiteurs de protéase; à éliminer la matière particulaire, et à fractionner l'extrait soluble traité au SDS. Le matériel de poids moléculaire élevé obtenu est immobilisé, et coloré en vue de la détection de substances muqueuses acides ou neutres puis les colorations spécifiques sont quantifiées. Les modifications observées corroborent celles que présentent les coupes histologiques des tissus exposés. Ce test sert à confirmer le potentiel métaplasique des substances suspectés, à identifier les médiateurs neurohumoraux intervenant dans la métaplasie des cellules sécrétrices de mucus dans des modèles animaux d'affections pulmonaires obstruantes chroniques et à identifier les composés pouvant les améliorer.

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