Expression and release of intercellular adhesion molecule-1 in renal-cancer patients.
We examined ICAM-1 expression in 37 freshly dissociated renal-cancer cell populations. Immunoperoxidase analysis revealed that 31 of the 37 renal tumors expressed ICAM-1 to various degrees; ICAM-1 expression was significantly lower in tumor cells obtained from patients remaining tumor-free after a median follow-up of 60 months (mean value 24.4% +/- 21) than in tumor cells obtained from the relapsed patients (mean value 40.8% +/- 22), and the low expression of this molecule on the cell surface seemed to correlate with favorable clinical behavior. In 41 patients, the mean level of sICAM-I was 551 +/- 260 ng/ml, significantly higher than normal. However, sICAM-1 levels were significantly lower in the 20 tumor-free (mean 467 +/- 158 ng/ml) than in the 21 metastatic patients (mean 631 +/- 318 ng/ml). Eleven renal-cancer cell populations were cultured in order to examine the expression and release of ICAM-1. All of these cells were positive for ICAM-1 expression, which was elevated in 6 cases (> 50%) and low in the remaining 5 cases (18-35%). However, only the 5 cell populations expressing low levels of ICAM-1 released this molecule, showing an inverse correlation with cellular expression. Five of the cell populations were treated for 48 hr with rIFN-gamma, in these cells, both ICAM-1 expression and sICAM-1 levels increased, although sICAM-1 levels in the supernatants of the cell populations with constitutive high ICAM-1 expression remained very low.
Santarosa
M
M
Division of Medical Oncology, Centro di Riferimento Oncologico, Aviano, Italy.
Favaro
D
D
Quaia
M
M
Spada
A
A
Sacco
C
C
Talamini
R
R
Galligioni
E
E
D000328:Adult; D000368:Aged; D002292:Carcinoma, Renal Cell / Q000097:blood / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000097:blood / Q000502:physiology*; D007371:Interferon-gamma / Q000494:pharmacology; D007680:Kidney Neoplasms / Q000097:blood / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D011994:Recombinant Proteins; D012995:Solubility; D013268:Stimulation, Chemical; D014407:Tumor Cells, Cultured / Q000187:drug effects
D011994:Recombinant Proteins; D018799:Intercellular Adhesion Molecule-1; D007371:Interferon-gamma