TSPAN8, identified by Escherichia coli ampicillin secretion trap, is associated with cell growth and invasion in gastric cancer

Abstract

Background Gastric cancer (GC) is one of the most common human cancers. Genes expressed only in cancer tissue, especially on the cell membrane, will be useful biomarkers for cancer diagnosis and therapeutics. Methods To identify novel genes encoding transmembrane protein specifically expressed in GC, we generated an Escherichia coli ampicillin secretion trap (CAST) library from diffuse-type GC cell line MKN-45. CAST is a survival-based signal sequence trap method that exploits the ability of mammalian signal sequences to confer ampicillin resistance to a mutant b-lactamase lacking the endogenous signal sequence. Results By sequencing 1,536 colonies, we identified 23 genes encoding the transmembrane protein present in GC. Among these genes, TSPAN8 (also known as CO-029 and TM4SF3) gene, which encodes transmembrane protein tetraspanin 8, was emphasized as a candidate. Immunohistochemical analysis of tetraspanin 8 in human GC tissues revealed that 72 (34 %) of 210 GC cases were positive for tetraspanin 8, and microvessel density was significantly higher in tetraspanin 8-positive GC than in tetraspanin 8-negative GC. Furthermore, univariate and multivariate analyses revealed that tetraspanin 8 expression is an independent prognostic classifier of patients with GC. TSPAN8 knockdown by siRNA reduced the invasion of GC cell line. The reduction of invasiveness was retrieved by the tetraspanin 8-containing exosome. Conclusion These results suggest that tetraspanin 8 is involved in tumor progression and is an independent prognostic classifier in patients with GC.

MiR-324-5p reduces viability and induces apoptosis in gastric cancer cells through modulating TSPAN8

“…The bioinformatics analysis showed that the potential binding sites of miR‐324‐5p presented in the 3′‐UTR of Tetraspanin 8 (TSPAN8), suggesting the possible interaction between miR‐324‐5p and TSPAN8. More importantly, TSPAN8 was confirmed to induce cell growth and invasion in gastric cancer . So, the purpose of this study was to explore whether miR‐324‐5p was involved in gastric cancer via regulating TSPAN8.…”

Fukutin, identified by the Escherichia coli ampicillin secretion trap (CAST) method, participates in tumor progression in gastric cancer

“…Our recent study of Escherichia coli ampicillin secretion trap (CAST) analysis on GC cell lines and cancer tissues identified several candidate genes. Desmocollin 2 (DSC2) expression was associated with GC of the intestinal mucin phenotype with CDX2 expression [15] and transmembrane 9 superfamily member 3 (TM9SF3) expression was significantly associated with tumor progression and involved in cancer cell invasion [16]. These results indicated the methods to be useful for the identification of novel genes associated with GC; however, such alterations cannot completely explain the pathogenesis of GC.…”

“…We previously generated CAST libraries from two GC cell line CAST libraries-MKN-1 [15], and MKN-45 [16]and normal stomach [15]. CAST is a useful method for identifying novel biomarkers and new therapeutic targets.…”

Identification of cold responsive genes in Pacific white shrimp (Litopenaeus vannamei) by suppression subtractive hybridization

“…In cancer and immunity studies, TSPAN8 has been intensively studied and found to regulate various cellular process such as cell migration, proliferation and differentiation. (Minami et al;Livak and Schmittgen, 2001;Bustin et al, 2009;Anami et al) . Furthermore, TSPAN8 has been shown to be widely expressed in various tissue types (Pan et al) , which is consist with our findings and further speaks to its diverse functions.…”