Biography:

In the past Mihai Nita-Lazar has collaborated on articles with Basem Jamal. One of their most recent publications is Pkc1p modifies CPY* degradation in the ERAD pathway. Which was published in journal Biochemical and Biophysical Research Communications.

More information about Mihai Nita-Lazar research including statistics on their citations can be found on their Copernicus Academic profile page.

Mihai Nita-Lazar's Articles: (3)

Pkc1p modifies CPY* degradation in the ERAD pathway

AbstractThe process of endoplasmic reticulum-associated degradation (ERAD) involved in the degradation of misfolded N-linked glycoproteins utilizes Cdc48p which extracts misfolded glycoproteins from the lumen to the cytosol to present them for deglycosylation and degradation. Pkc1p has been identified as a component of the ERAD pathway, because deletion of the pkc1 gene impairs ERAD and causes accumulation of CPY* in the lumen of the ER, most probably because of the mislocalization of Cdc48p. In addition, we show that Cdc48p interacts in the cytosol with the deglycosylation enzyme, PNGase, only when Cdc48p is associated with a misfolded glycoprotein.

Desialylation of airway epithelial cells during influenza virus infection enhances pneumococcal adhesion via galectin binding

Highlights•We studied the role of galectins in pneumococcal adhesion in the lung upon influenza.•After influenza, galectin-1 and -3 levels are increased in the bronchoalveolar space.•Viral and bacterial neuraminidases increase galectin binding to epithelial cells.•Galectin-1 and -3 bind to glycans from the influenza virus and pneumococcus.•Galectin-3 enhances pneumococcal adhesion to influenza-infected airway epithelium.

Aberrant amplification of the crosstalk between canonical Wnt signaling and N-glycosylation gene DPAGT1 promotes oral cancer

SummaryOral cancer is one of the most aggressive epithelial malignancies, whose incidence is on the rise. Previous studies have shown that in a subset of human oral squamous cell carcinoma (OSCC) tumor specimens, overexpression of the DPAGT1 gene, encoding the dolichol-P-dependent N-acetylglucoseamine-1-phosphate transferase, a key regulator of the metabolic pathway of protein N-glycosylation, drives tumor cell discohesion by inhibiting E-cadherin adhesive function. Recently, we reported that DPAGT1 was a target of the canonical Wnt signaling pathway. Here, we link overexpression of DPAGT1 in human OSCC tumor specimens to aberrant activation of canonical Wnt signaling. We report dramatic increases in β- and γ-catenins at the DPAGT1 promoter and correlate them with reduced expression of a Wnt inhibitor, Dickkopf-1 (Dkk-1). Using human squamous carcinoma cell lines of the head and neck, we show that partial inhibition of DPAGT1 reduces canonical Wnt signaling, indicating that DPAGT1 and canonical Wnt signaling function in a positive feedback loop. We provide evidence that E-cadherin inhibits DPAGT1, canonical Wnt signaling and the OSCC cancer phenotype by depleting nuclear β- and γ-catenins, with hypoglycosylated E-cadherin being the most effective. This suggests that in human OSCC, extensive N-glycosylation of E-cadherin compromises its ability to inhibit canonical Wnt signaling and DPAGT1 expression. Our studies reveal a novel interplay between DPAGT1/N-glycosylation and canonical Wnt signaling and suggest that dysregulation of this crosstalk is a key mechanism underlying OSCC. They also suggest that partial inhibition of DPAGT1 may represent an effective way to restore normal interactions among these essential pathways in oral cancer.

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