The role of cell surface glycoproteins in determining in vivo blood-borne arrest and survival characteristics of murine mel anoma sublines of low (B16-F1 ) or high (B16-F10) potential to form experimental lung métastasesafter injection i.v. was as sessed after inhibiting tumor cell protein glycosylation with tunicamycin. Incubation of B16-F1 or B16-F10 cells with 0.5 /¿g(or above) tunicamycin...

The reported effects of tunicamycin upon collagen biosynthesis are conflicting, especially with regard to procollagen secretion. We have examined the possible causes for this paradox by employing human fibroblasts in cell culture. Confluent and exponentially dividing fibroblasts were slowly affected by tunicamycin; the confluent cells responded maximally about 15 h following exposure to the ant...

Background and Aim: Atherosclerosis is known as a multifactorial inflammatory disease. Trimethylamine N-oxide (TMAO) as a risk factor, has a potential to trigger or enhance the immune inflammatory reactions in atherosclerosis. Yet, The exact mechanism by which TMAO induces inflammation during atherosclerosis is not well understood. The present study was designed to evaluate the expression of IL...

P rotein homeostasis within the endoplasmic reticulum (ER) is essential for cell viability, and its misregulation is implicated in a growing number of diseases, including Alzheimer’s disease, diabetes, and cancer (1–3). Consequently, the pharmacological manipulation of this pathway is of broad scientific and clinical interest. A variety of drugs have been used to model specific types of stresse...

We examined the inhibitory activity against bacterial peptidoglycan biosynthesis, mammalian glycoprotein biosynthesis and growth of BALB/3T3 cells of four different types of liposidomycins which have the structure with or without sulfate and/or 3-methylglutaric acid moieties. Liposidomycins inhibited peptidoglycan biosynthesis about 30 to 500 times more effectively than tunicamycin, whereas lip...

endoplasmic reticulum (er) stress provides abnormalities in insulin action, inflammatory responses, lipoprotein b100 degradation and hepatic lipogenesis. excess accumulation of triglyceride in hepatocytes may also lead to disorders such as non-alcoholic fatty liver disease (nafld) and nonalcoholic steatohepatitis (nash). opioid peptides are involved in triglyceride and cholesterol dysregulat...

The protein glycosylation inhibitor tunicamycin protected male BALB/c mice from tumor necrosis factor alpha-induced liver failure. Tunicamycin also inhibited tumor necrosis factor-induced cell death in primary hepatocyte cultures with a median inhibitory concentration of 8 nM, but not in the tumor cell line WEHI 164 clone 13. Hepatocyte death in our culture system was characterized by DNA fragm...

Overexpression of P-glycoprotein (P-gp, drug transporter) in neoplastic cells is the most frequently observed molecular cause of multidrug resistance. Here, we show that the overexpression of P-gp in L1210 cells leads to resistance to tunicamycin and benzyl 2-acetamido-2-deoxy-α-d-galactopyranoside (GalNAc-α-O-benzyl). Tunicamycin induces both glycosylation depression and ubiquitination improve...

Although molecular chaperones in the endoplasmic reticulum (ER) are known to be involved in folding and assembly of glycosylated proteins, it is unclear whether preinduced ER chaperones can protect cardiomyocytes from lethal injury. In this study we used tunicamycin, an inhibitor of N-linked glycosylation in the ER, to preinduce ER chaperones in H9c2 cardiomyocytes and we tested the cytoprotect...