# The role and regulatory mechanism of lysosome associated protein transmembrane 4β in tumors

## TL;DR

This paper reviews the role of LAPTM4B, a protein linked to cancer, in regulating cell processes like autophagy and drug resistance in tumors.

## Contribution

The paper provides a comprehensive summary of recent findings on LAPTM4B's regulatory mechanisms in various cancers.

## Key findings

- LAPTM4B is overexpressed in multiple cancers and linked to tumor susceptibility through genetic polymorphisms.
- LAPTM4B interacts with autophagy-related proteins and ceramides, influencing autophagy and exosome release.
- The protein affects tumor cell survival and drug resistance through these interactions.

## Abstract

The oncogene LAPTM4B (encoding lysosome-associated protein transmembrane-4β), first cloned in hepatocellular carcinoma cells, is located on chromosome 8q22.1 and encodes two isoforms, LAPTM4B-35 and LAPTM4B-24. LAPTM4B proteins have four transmembrane structural domains and are mainly distributed in lysosomal and endosomal membranes of cells. Studies have shown that LAPTM4B is overexpressed in a variety of cancers, in which the genetic polymorphism of LAPTM4B is associated with tumor susceptibility. LAPTM4B also regulates various cell signaling pathways, interacts with autophagy-related proteins and ceramides, and regulates the autophagy process and the release of exosomes, which in turn affect the survival and drug resistance of tumor cells. In conclusion, this paper summarizes recent research on LAPTM4B, aiming to explore the role and potential mechanisms of LAPTM4B in a variety of tumors.