Wilkersonwebb8231
ER-positive breast cancer patients commonly undergo endocrine therapy with drugs such as tamoxifen. Despite tamoxifen being a highly effective drug, long-term treatment results in resistance in one-third of the patients. Although many explanations for the development of tamoxifen resistance have been put forward, a clearly defined underlying mechanism is still lacking.
The expression level of HOXB5 was evaluated between MCF7 breast cancer cells and tamoxifen-resistant MCF7 (TAMR) cells by RT-PCR. Then, the effect of HOXB5 on invasion and migration abilities as well as on cancer stemness were investigated through 3D culture and spheroid formation assay.
In this study, we provide evidence that HOXB5 is up-regulated in TAMR cells. EGFR is concurrently overexpressed, and the EGFR signaling cascade is activated, resulting in migratory and invasive phenotypes in TAMR cells compared to MCF7 cells. However, HOXB5 knockdown in TAMR cells resulted in the de-activation of the EGFR signaling pathway, less aggressive phenotypes and restoration of sensitivity to tamoxifen treatment. More interestingly, TAMR cells expressed higher levels of stem cell markers, and as a result, their enhanced stemness allowed for a better formation of spheroids than MCF7 cells. When HOXB5 was overexpressed in MCF7 cells, they were able to form a larger number of spheroids as in TAMR cells.
HOXB5 is one of the key factors involved in tumor aggression and progression in tamoxifen-resistant breast cancer cells.
HOXB5 is one of the key factors involved in tumor aggression and progression in tamoxifen-resistant breast cancer cells.
Plakophilin 1 (PKP1) expression is inversely related to cancer grade. This study aimed to evaluate whether PKP1 is a prognostic marker for esophageal cancer (EC).
We tested immunohistochemically for PKP1 in squamous cell carcinoma EC specimens from 99 patients, including cytoplasmic (C), membrane (M), and nuclear (N) cellular areas, and analyzed their relationships with clinicopathological factors.
PKP1stains were stratified into strong and weak for all three cellular areas. Staining was inversely related to tumor depth (C p=0.002, M p=0.00007, N p=0.02), lymph node metastasis (C p=0.003, M p=0.001, N p=0.004) and pathological stage (C p=0.0004, M p=0.0001, N p=0.006). Cytoplasmic and membrane staining were inversely related to vessel invasion. Patients with strong C stain had a better overall survival than those with weak C stains (p=0.01). Disease-free survival of patients with strong M stains was better than that of those with weak staining (p=0.01).
Cytoplasmic and membrane PKP1 expression is a possible prognostic marker for EC.
Cytoplasmic and membrane PKP1 expression is a possible prognostic marker for EC.
Cholangiocarcinoma (CCA), a biliary cancer, is a health problem worldwide. The major problem in CCA treatment presents limited options. To date, targeting cancer metabolism is a promising anti-cancer strategy. To elucidate the functional importance of lipid metabolism in CCA, de novo lipogenesis was inhibited using 5-(tetradecyloxy)-2-furoic acid (TOFA), an acetyl CoA carboxylase inhibitor.
Anti-proliferative effects of TOFA were determined both in vitro and in vivo. Its inhibitory effect on cell-cycle and apoptosis was investigated by flow cytometry and western blot analysis of relevant markers.
TOFA inhibited CCA cell growth, induced cell-cycle progression accompanied by apoptosis in a dose-dependent manner. Induction of p21, and caspase-3, -8, and -9 cleavages, while down-regulation of cyclin B1 and cyclin D1 were observed in TOFA-treated cells. The therapeutic potential was demonstrated in vivo.
De novo lipogensis is essential for CCA cell growth and is an alternative target for CCA treatment.
De novo lipogensis is essential for CCA cell growth and is an alternative target for CCA treatment.
We compared the therapeutic efficacy of two recently developed experimental anticancer technologies 1) in situ vaccination based on local immunotherapy with CpG oligonucleotides and anti-OX40 antibodies to activate antitumor immune response and 2) "Karanahan" technology [from the Sanskrit kāraṇa ('source') + han ('to kill')] based on the combined injection of cyclophosphamide and double-stranded DNA to eradicate cancer stem cells.
The anticancer approaches were compared on three types of mouse malignant tumors with different grades of immunogenicity weakly immunogenic carcinoma Krebs-2, moderately immunogenic Lewis carcinoma, and highly immunogenic A20 В-cellular lymphoma.
Our results indicated that in situ vaccination was the most effective against the highly immunogenic tumor А20. In addition, "Karanahan" demonstrated high efficiency in all types of tumors, regardless of their immunogenicity or size.
"Karanahan" therapy showed higher efficacy relative to in situ vaccination with CpG oligonucleotides and anti-OX40 antibodies.
"Karanahan" therapy showed higher efficacy relative to in situ vaccination with CpG oligonucleotides and anti-OX40 antibodies.
The mechanisms through which cetuximab (cMab) coadministration with paclitaxel (PTX) enhances antitumor efficacy remain unclear. We examined the mechanism of the antitumor enhancing effect of cMab by determining changes in gene expression in the PI3K-AKT pathway.
Eight human oral squamous cell carcinoma (OSCC) cell lines were cultured three-dimensionally and exposed to PTX + cMab. The expression levels of PTEN mRNA in OSCC cell lines after anticancer drug treatment were assessed using real-time PCR. click here PTEN mRNA expression levels were also confirmed after administration of PTX + cMab in vivo. Western blot analysis was used to confirm the results at the protein level.
PTEN mRNA and protein expression were significantly increased only in the cell lines with high sensitivity to PTX + cMab, and similar results were observed in vivo.
PTEN activation may enhance the antitumor effect of PTX + cMab.
PTEN activation may enhance the antitumor effect of PTX + cMab.
The present study investigated the oncogenic functions of TACC3 in the progression of gastric cancer (GC).
We analysed TACC3 in relation to cell growth, invasion capability, expression of epithelial-mesenchymal transition (EMT)-related markers, and ERK/Akt/cyclin D1 signaling factors. The correlation between the immunohistochemically confirmed expression of TACC3 and clinical factors was also analyzed.
The increased proliferation and invasion of TACC3-over-expressing GC cells was accompanied by altered regulation of EMT-associated markers and activation of ERK/Akt/cyclin D1 signaling. Immunohistochemical analysis of TACC3 in human GC tissues revealed that its expression is correlated with aggressive characteristics and poor prognosis of intestinal-type GC.
TACC3 contributes to gastric tumorigenesis by promoting EMT via the ERK/Akt/cyclin D1 signaling pathway. The correlation between TACC3 expression and multiple clinicopathological variables implies that its effective therapeutic targeting in GC will depend on the tumor subtype.
