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1995 ; 86
(6
): 562-7
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Cytokine production in five tumor cell lines with activity to induce cancer
cachexia syndrome in nude mice
#MMPMID7622421
Iseki H
; Kajimura N
; Ohue C
; Tanaka R
; Akiyama Y
; Yamaguchi K
Jpn J Cancer Res
1995[Jun]; 86
(6
): 562-7
PMID7622421
show ga
To identify the so-called toxohormone, which is a tumor-derived factor with
activity to induce cancer cachexia syndrome in tumor-bearing animals, 5 human
cancer cell lines with this activity were studied for cytokine production. Tumor
cell products with activity to inhibit lipoprotein lipase (LPL) were shown to
play an important role in the development of the cancer cachexia syndrome. All
culture media conditioned by the 5 cell lines possessed LPL-inhibitory activity.
However, the activity differed with the cell line. In order to characterize the
activity, we examined whether the cultured cells produced cytokines with activity
to inhibit LPL. A melanoma cell line, SEKI, and a neuroepithelioma cell line,
NAGAI, were found to express a large amount of leukemia inhibitory factor (LIF)
mRNA. Furthermore, both of these cell lines were demonstrated to produce a large
amount of LIF protein, and plasma levels of LIF were extremely elevated in SEKI-
and NAGAI-bearing nude mice, indicating that LIF produced by the tumor cells
induced cancer cachexia syndrome in the animals. Thus, LIF fulfills the
requirements for a toxohormone, except for suppressive activity on liver
catalase. In contrast, the mechanisms responsible for cachexia in the MKN-1-,
LX-1- and LS180-bearing mice remain unknown. These findings suggest that various
types of bioactive substances produced by cancer cells could be toxohormones.