Recovery of immune competence after tumour resection in mice: correlation with loss of suppressor elements

Abstract

Changes in the immune competence and levels of suppressore elements were assessed by mitogen stimulation and in vitro antibody production, after resection of a transplantable sarcoma. Spleen cells from tumour-resected animals were found to have depressed responses to conA as well as to the antigens SRBC and DNP-LPS. This inability to respond was gradually overcome and, by Day 21 after resection, spleen cell competence had returned to normal levels. Suppressor cells isolated from the spleens of tumour-resected animals were capable of suppressing the conA response and PFC response of normal syngeneic spleen cells in vitro. The ability to suppress the conA response of normal cells disappeared by Day 1 after resection, while the ability to suppress the anti-SRBC and anti-DNP PFC response of normal cells disappeared by Day 8 and Day 14 respectively. Serum from tumour-resected mice was also found to be suppressive to the conA response of normal spleen cells. The inhibitory material responsible for suppression eluted with the Ig-containing fraction on Sephadex G-150. This inhibitory material gradually disappeared from the serum of tumour-resected mice and was no longer apparent by Day 14. Therefore, it appeared that the return of normal lymphocyte function after tumour-resection was concomitant with the disappearance of splenic suppressor cells and suppressive serum factor.

Effector and enhancing lymphoid cells in plasmacytoma‐bearing mice. II. Dynamic changes during tumor progression

“…Although it is clear that various effector and suppressor immune mechanisms may operate in tumorbearing hosts (reviewed by Kirchner, 1978;Mikulski and Muggia, 1978;and Broder et al, 1978) there are relatively few studies on the dynamic interaction of these factors during tumor growth (Barski and Youn, 1969;Lamon et al, 1972;Bansal and Sjogren, 1973;Youn et al, 1975;Deckers et al, 1973;Gascoyne et al, 1978;Jurin and Plavsic, 1978;Huber and Lucas, 1978). Such investigations are necessary for our further understanding of immunoregulatory mechanisms that permit tumor escape through compromising effector immune reactions of the host.…”

Recalcitrant lip verrucous carcinoma successfully treated with acitretin after carbon dioxide laser ablation

“… 6 Removal of the tumor was found to restore lymphocyte function in a murine model. 7 We hypothesized that reduction of the tumor volume may have played a critical role in the success in this patient. The CO 2 laser offers precise excision of oral carcinoma, a better visualization of the operational field, and minimal blood loss.…”