Prothymosin alpha augments deficient antitumor activity of monocytes from melanoma patients in vitro.

Abstract:

:Human peripheral blood monocytes derived from normal donors, melanoma patients (MP) before and after chemotherapy (MPa) were assayed for their capacity to inhibit SK-MEL-28 melanoma cell growth in vitro; in addition, growth modulating effects by prothymosin alpha 1 (ProTa) were studied. After preincubation with or without ProTa for 1 day, monocytes were cultured in the absence or presence of interferon-gamma (rIFN-gamma) for a further day, and after cocultivation with SK-MEL-28 melanoma cells for 3 days monocyte/macrophage-mediated tumoristatic activity was determined employing the microculture tetrazolium (MTT) assay. The level of baseline growth inhibitory activity of unstimulated MP and MPa monocytes was 22% and 15%, respectively, and was significantly lower (p < 0.001) than that of normal monocytes (35%). The stimulation of monocytes/macrophages by rIFN-gamma greatly elevated the mean of their antitumor activity up to 44%, 49% and 58% in the group of MP, MPa and normal donors, respectively. ProTa significantly increased the level of monocyte-mediated growth inhibition of MP and normal donors, when it was applied alone or in combination with rIFN-gamma. Monocytes of MP at early stages (I and II) of their disease, when incubated with rIFN-gamma, showed a higher increase in tumoristatic activity than at stage III and tended to be the most susceptible to preincubation with ProTa followed by rIFN-gamma activation. However, on average tumoristatic activity of MP/MPa monocytes was significantly lower compared with that of normal monocytes, when activated with rIFN-gamma or ProTa alone or combined. Moreover, no effects on TNF-alpha secretion of MP/MPa monocytes were found by ProTa and/or rIFN-gamma, whereas TNF-alpha levels from normal monocytes were significantly increased by the two stimuli. These results indicate that monocyte disorders in melanoma patients may be partially normalized by ProTa.

journal_name

Anticancer Res

journal_title

Anticancer research

authors

Garbin F,Eckert K,Büttner P,Garbe C,Maurer HR

subject

Has Abstract

pub_date

1994-11-01 00:00:00

pages

2405-11

issue

6B

eissn

0250-7005

issn

1791-7530

journal_volume

14

pub_type

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