Supplemental Material, DS1_VET_10.1177_0300985818776055 - Histopathologic and Immunohistochemistry Findings in Feline Renal Cell Carcinoma

<p>Supplemental Material, DS1_VET_10.1177_0300985818776055 for Histopathologic and Immunohistochemistry Findings in Feline Renal Cell Carcinoma by Isao Matsumoto, James K. Chambers, Kazumi Nibe, Ryohei Kinoshita, Ryohei Nishimura, Hiroyuki Nakayama, and Kazuyuki Uchida in Veterinary Pathology</p

p62 filaments capture and present ubiquitinated cargos for autophagy

The removal of misfolded, ubiquitinated proteins is an essential part of the protein quality control. The ubiquitin‐proteasome system (UPS) and autophagy are two interconnected pathways that mediate the degradation of such proteins. During autophagy, ubiquitinated proteins are clustered in a p62‐dependent manner and are subsequently engulfed by autophagosomes. However, the nature of the protein substrates targeted for autophagy is unclear. Here, we developed a reconstituted system using purified components and show that p62 and ubiquitinated proteins spontaneously coalesce into larger clusters. Efficient cluster formation requires substrates modified with at least two ubiquitin chains longer than three moieties and is based on p62 filaments cross‐linked by the substrates. The reaction is inhibited by free ubiquitin, K48‐, and K63‐linked ubiquitin chains, as well as by the autophagosomal marker LC3B, suggesting a tight cross talk with general proteostasis and autophagosome formation. Our study provides mechanistic insights on how substrates are channeled into autophagy

Supplemental Material, DS1_VET_10.1177_0300985818777794 - Expression of Oligodendrocyte Precursor Cell Markers in Canine Oligodendrogliomas

<p>Supplemental Material, DS1_VET_10.1177_0300985818777794 for Expression of Oligodendrocyte Precursor Cell Markers in Canine Oligodendrogliomas by Takuya E. Kishimoto, Kazuyuki Uchida, Atigan Thongtharb, Tokuhiro Shibato, James K. Chambers, Kazumi Nibe, Yumiko Kagawa, and Hiroyuki Nakayama in Veterinary Pathology</p