Journal: medRxiv
Article Title: α2,6-Sialylation is Upregulated in Severe COVID-19 Implicating the Complement Cascade
doi: 10.1101/2022.06.06.22275981
Figure Lengend Snippet: (a) Scheme of the later portion of the complement cascade pathway and downstream signaling. Maroon boxes indicate complement proteins that were positive hits in our glycoproteomic analysis in . (b) Differential α2,6-sialylation of complement C5 and C9 in three patient groups. Western blot (anti-C5 and anti-C9) of SNA pulldown samples from pooled patient plasma with corresponding input is shown. Intensity ratios of pulldown/input bands are depicted in the bar plot. (c) Analysis of individual per patient paired ratio of ST6GAL1 to C5 mRNA expression in whole blood of healthy controls (n = 19) or those with seasonal coronavirus (n = 59), or COVID-19 (n = 46), from publicly available dataset Gene Expression Omnibus: GSE161731. Student’s t-test was used to determine p -values. ns: p ≥ 0.05; *: p < 0.05. (d) Representative images of IHC staining against C5b, C9, ST6GAL1 or Pan-Cytokeratin in the lower lobe of the lungs in COVID-19 negative (n = 2) (top) or COVID-19 positive (n = 8) (bottom) autopsy specimens. Scale bars represent 75 μm.
Article Snippet: Single and multiplex-chromogenic immunohistochemistry was performed using unconjugated mouse-anti human Interleukin-6, (clone# OTI3G9, Origene, catalog #TA500067, Lot# VE2990982), unconjugated murine anti-human Vimentin (clone# V9, Ventana Medical Systems, Catalog# 790-2917, Lot# E04396, RRID:AB-2335925) and unconjugated mouse anti-human CD-163 clone MRQ-26 (Ventana Medical Systems catalog# 760-4437, lot# V001041, RRID: AB_2335969), unconjugated murine anti human ST6 beta-galactoside alpha-2,6-sialyltransferase 1, (clone# LN1, Thermo Fisher Scientific, Cat# MA5-11900, Lot# XC3519066A, RRID: AB_10980157 ), unconjugated murine anti-human Pan-Cytokeratin (PanK, Thermo Fischer Scientific Cat# MA1-82041, Lot# 985542A RRID: AB_2335731), unconjugated mouse anti-human complement C9 antibody, (clone# X197, Hycult Biotech, catalog# HM2111, Lot# 16152M0714-B, RRID: AB_2067596 ) and unconjugated mouse anti-human terminal complement complex C5b-9, (clone# aEll, Dako Cytomation, catalog# M0777, Lot# 20027911, RRID: AB_2067162 ).
Techniques: Western Blot, Expressing, Immunohistochemistry