Abstract
To improve the therapeutic benefit of hyperthermia, we examined changes of global gene expression after heat shock using DNA microarrays consisting of 12 814 clones. HeLa cells were treated for 1 h at 44°C and RNA was extracted from the cells 0, 3, 6, and 12 h after heat shock. The 664 genes that were up or down‐regulated after heat shock were classified into 7 clusters using fuzzy adaptive resonance theory (fuzzy ART). There were 41 genes in two clusters that were induced in the early phase after heat shock. In addition to shock response genes, such as hsp70 and hsp40, the stress response genes c‐jun, c‐fos and egr‐1 were expressed in the early phase after heat shock. We also found that expression of matrix metalloproteinase 3 (MMP‐3) was enhanced during the early response. We therefore investigated the role of MMP‐3 in the heat shock response by examining HeLa cell survival after heat treatment in the presence and absence of an MMP‐3 inhibitor, N‐isobutyl‐N‐(4‐methoxyphenyl‐sulfonyl)glycylhydroxamic acid (NNGH) or N‐hydroxy‐2(R)‐[[4‐methoxysulfonyl] (3‐picolyl)amino]‐3‐methylbutaneamide hydro‐chloride (MMI270). The number of surviving cells 3 days after heat treatment significantly decreased, reaching 3.5% for NNGH and 0.2% for MMI270. These results indicate that the MMP‐3 inhibitors enhanced heat shock‐induced cell death and behaved as stress enhancers in cancer cells. This valuable conclusion was reached as a direct result of the gene expression profiling that was performed in these studies.
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