High-fat diet alters N-glycosylation of PTPRJ in murine liver

糖基化 蛋白质酪氨酸磷酸酶 聚糖 N-连接糖基化 生物 酪氨酸 生物化学 甘露糖 磷酸化 胰岛素受体 受体 内分泌学 内科学 糖蛋白 细胞生物学 胰岛素抵抗 胰岛素 医学
作者
Jannis Ulke,Christian Schwedler,Janine Krüger,Vanessa Stein,Peter Geserick,André Kleinridders,Kai Kappert
出处
期刊:Journal of Nutritional Biochemistry [Elsevier BV]
卷期号:123: 109500-109500 被引量:1
标识
DOI:10.1016/j.jnutbio.2023.109500
摘要

Protein tyrosine phosphatases (PTPs) regulate multiple signaling pathways. Disruption of tyrosine phosphorylation through imbalanced action between protein tyrosine kinases (RTKs) and PTPs is a hallmark of metabolic disorders, including insulin resistance. A representative member of the receptor-type PTP family, PTPRJ (DEP-1), was previously identified as a negative regulator of insulin signaling and possesses post-translational glycosylation sites. In this regard, it seems of great importance to decipher the structure of PTPRJ's glycosylation, particularly in the context of metabolic disturbances, but this has not been done in detail. Thus, here we aimed at characterizing the glycosylation pattern of PTPRJ in liver. We show that N-glycosylation accounts for up to half of PTPRJ's molecular weight. Applying mass spectrometry, we detected increased levels of high-mannose structures in PTPRJ in liver tissue of obese mice compared to lean littermates. In addition, complex neutral structures without fucose were also elevated in PTPRJ of high-fat diet (HFD) mice. Conversely, complex fucosylated N-glycans as well as sialylated bi- and triantennary N-glycans, were significantly reduced in PTPRJ of HFD-derived liver tissue compared to LFD by ∼two fold (P≤.01, P≤.0001 and P≤.001, respectively). In congruence with these findings, the mannosidase MAN2A1, responsible for the conversion of high-mannose to complex N-glycans, was significantly downregulated under HFD conditions. Here we present for the first time that HFD-induced obesity impacts on the glycosylation pattern of the insulin signaling component PTPRJ in liver. These findings may inspire new research on the glycosylation of PTPs in metabolic diseases and may open up new therapeutic approaches.
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