RGD Reference Report - Development of an immunoassay for serum caveolin-1: a novel biomarker for prostate cancer. - Rat Genome Database

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Development of an immunoassay for serum caveolin-1: a novel biomarker for prostate cancer.

Authors: Tahir, SA  Ren, C  Timme, TL  Gdor, Y  Hoogeveen, R  Morrisett, JD  Frolov, A  Ayala, G  Wheeler, TM  Thompson, TC 
Citation: Tahir SA, etal., Clin Cancer Res. 2003 Sep 1;9(10 Pt 1):3653-9.
RGD ID: 2289109
Pubmed: PMID:14506154   (View Abstract at PubMed)

PURPOSE: Caveolin-1 (cav-1), the major protein component of caveolae, plays an important role in multiple signaling pathways, molecular transport, and cellular proliferation and differentiation. The specific functions of cav-1/caveolae are highly cell and context dependent. We have previously shown that cav-1 expression is increased in metastatic human prostate cancer and that cav-1 cellular protein expression is predictive of recurrence of the disease after radical prostatectomy. Recently, we reported that cav-1 is secreted by androgen-insensitive prostate cancer cells, and we detected, by Western blotting, cav-1 in the high-density lipoprotein(3) fraction of serum specimens from patients with prostate cancer. EXPERIMENTAL DESIGN: Using rabbit polyclonal antibodies with specificity for cav-1, we developed a direct sandwich immunoassay for the determination of cav-1 in serum. A recombinant human cav-1 fusion protein was overexpressed and purified from 293 PE cells and used as a calibrator. RESULTS: The assay was highly specific and had a minimum detection limit of 0.017 ng/ml (mean + 3 SD of zero calibrator) and measuring range of up to 200 ng/ml. Intra-assay coefficient of variation was 2.29-6.74% and inter-assay coefficient of variation was 2.81-6.43% over the serum concentration tested 0.04-31.89 ng/ml. The recovery limit of cav-1 by the assay was 89.55-100.28%. The median serum cav-1 level in 102 prostate cancer patients with clinically localized disease (0.463 ng/ml) was significantly higher than 81 healthy control men (0.324 ng/ml; P = 0.0446, Mann-Whitney test) or 107 men with benign prostatic hyperplasia (0.172 ng/ml; P = 0.0317, Mann-Whitney test). CONCLUSIONS: Our results indicate that serum cav-1 has the power to differentiate between prostate cancer and benign prostatic hyperplasia patients and the potential to be an important biomarker for prostate cancer. Additional studies to test the potential of serum cav-1 as a diagnostic and/or prognostic marker in prostate cancer are warranted.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
prostate cancer  IEP 2289109protein:increased expression:serumRGD 
prostate cancer  ISOCAV1 (Homo sapiens)2289109; 2289109protein:increased expression:serumRGD 

Objects Annotated

Genes (Rattus norvegicus)
Cav1  (caveolin 1)

Genes (Mus musculus)
Cav1  (caveolin 1, caveolae protein)

Genes (Homo sapiens)
CAV1  (caveolin 1)


Additional Information