Moreover, the extracellular matrix may serve to anchor the cancer cells [9]. Indeed, our current study has demonstrated such an interaction and showed that TGF-β1 promoted the Selonsertib cost peritoneal fibrosis that in turn provided a suitable ‘soil’ for metastasis. We found that the peritoneum from patients with stage III and IV gastric cancer and peritoneal carcinomatosis Tucidinostat was thickened and consisted of extensive fibrosis and mass stroma cell infiltration. Most importantly, fibrosis also occurred in the peritonea from the stage III gastric cancer tissues even in the absence of carcinomatosis,
indicating that this peritoneal fibrosis did not depend on tumor presence but instead may have been promoted by inflammatory factors, such as TGF-β1, secreted by gastric cancer cells [21]. The cause of peritoneal fibrosis in gastric cancer patients has been investigated previously, and TGF-β1 was identified as one of the most potent fibrotic stimuli for mesothelial fibrosis [22, 23]. For example, our previous study showed that TGF-β1 expression in gastric cancer tissues was closely associated with the depth of gastric cancer cell infiltration and peritoneal metastasis of gastric cancer. But, it was unclear how TGF-β1 induced gastric mTOR signaling pathway cancer cell invasion
and metastasis to the peritonea. Our current study indicated that the induced TGF-β1 level observed in the peritoneal wash fluid could play a key role in promoting peritoneal fibrosis and create a suitable environment for gastric cancer metastasis. This idea was further supported by gastric cancer cell adhesion assay that showed TGF-β1-treated peritonea were more favorable for gastric cancer cell adhesion. In addition, we also observed that the levels of TGF-β1 were closely related to the degree of peritoneal fibrosis in gastric cancer patients (Stage III and IV gastric cancers had high levels of TGF-β1 in the peritoneal wash fluid, but also had more extensive peritoneal fibrosis).
The data suggested that TGF-β1 secreted by gastric cancer cells was able to promote peritoneal fibrosis and in turn provide suitable ‘soil’ for metastasis. In order to confirm the effect of TGF-β1 on peritoneal fibrosis, we showed that TGF-β1 affected the MycoClean Mycoplasma Removal Kit function of mesothelial cells by stimulating extracellular matrix (including fibronectin and collagen III) production, which consists of molecules important in cell adhesion and tissue repair [24, 25]. TGF-β1 induced fibronectin and collagen III expression in both dose- and time-dependent manners. Meanwhile, immunolocalization showed that expression of fibronectin protein was induced by TGF-β1 in HPMCs. These data further supported the central role theory for TGF-β1 in peritoneal fibrosis and may provide a useful model by which to study peritoneal metastasis of gastric cancer.
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