Epitope recognition by anti-cathepsin D autoantibodies in endometrial cancer patients.

Abstract:

OBJECTIVE:This study analyzed a model for the identification of specific epitopes recognized by autologous tumor-reactive humoral responses of endometrial cancer patients as potential markers for the monitoring of cancer. METHODS:The presence of circulating pro- and mature forms of cathepsin D and antibodies reactive with this enzyme were identified by Western immunoblot and quantitated by an enzyme immunoassay. Specific immunoreactivities with 34- and 52-kDa cathepsin D forms were analyzed by Western immunoblot using sera from endometrial cancer patients (n = 40) and normal volunteers (n = 15). Subsequently, reactivities with specific cathepsin D epitopes were defined by a peptide-specific ELISA. RESULTS:Circulating pro-forms of cathepsin D were detected in 31 of 40 endometrial cancer patients tested and none of the control volunteers. Circulating IgG reactive with cathepsin D could be demonstrated in 29/31 patients with circulating procathepsin D, while an anti-cathepsin D response was not detectable in normal controls. This response appeared to be directed against the pro-peptide portion of cathepsin D. Using a peptide-specific ELISA, the frequencies of antibody production against specific epitopes within the pro-peptide were defined. CONCLUSION:There is a demonstrable tumor-reactive immune response elicited in endometrial cancer patients, directed against specific antigenic epitopes, some of which are conserved among these patients. Since these proteins are recognized as non-self, due at least in part to posttranslational processing errors, defining these epitopes will be useful as a means of diagnosis, assessment of therapeutic success, and, ultimately, identification of immunotherapeutic targets.

journal_name

Gynecol Oncol

journal_title

Gynecologic oncology

authors

Bosscher JR,Gerçel-Taylor C,Watkins CS,Taylor DD

doi

10.1006/gyno.2001.6120

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

138-43

issue

2

eissn

0090-8258

issn

1095-6859

pii

S0090-8258(01)96120-7

journal_volume

81

pub_type

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