Protein interactions of FAM134B with EB1 and APC/beta-catenin in vitro in colon carcinoma.

Abstract:

:FAM134B is an autophagy regulator of endoplasmic reticulum and acts as a cancer suppressor in colon cancer. However, the molecular signaling pathways by which FAM134B interacts within colon carcinogenesis is still unknown. Herein, this study aims to determine the interacting partners of FAM134B for the first time in colon cancer and to explore the precise location of FAM134B in cancer signalling pathways. Liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) followed by anti-FAM134B co-immune precipitation of FAM134B interacting complex was used to identify the potential interactors of FAM134B in colon cancer cells. Western blot and confocal microscopic analysis were used to validate the physical interactions of FAM134B with the interactors. Lentiviral shRNA mediated silencing of FAM134B was used to examine the modulation of FAM134B interactors in cells. We have identified 29 novel binding partners, including CAP1, RPS28, FTH1, KDELR2, MAP4, EB1, PSMD6, PPIB/CYPB etc. Subsequent immunoassays confirmed the direct physical interactions of FAM134B with CAP1, EB1, CYPB, and KDELR2 in colon cancer cells. Exogenous suppression of FAM134B has led to significant upregulation of EB1 as well as reduction of KDELR2 expression. It was noted that overexpression of EB1 promotes WNT/β-catenin signaling pathways via inactivating tumor suppressor APC followed by activating β-catenin in colorectal carcinogenesis. This study has first time reported the gene signaling networks with which FAM134B interacts and noted that FAM134B is involved in the regulation of WNT/β-catenin pathway by EB1-mediated modulating of APC in colon cancer cells.

journal_name

Mol Carcinog

journal_title

Molecular carcinogenesis

authors

Islam F,Chaousis S,Wahab R,Gopalan V,Lam AK

doi

10.1002/mc.22871

subject

Has Abstract

pub_date

2018-11-01 00:00:00

pages

1480-1491

issue

11

eissn

0899-1987

issn

1098-2744

journal_volume

57

pub_type

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