The Tumor Suppressor MTUS1/ATIP1 Modulates Tumor Promotion in Glioma: Association with Epigenetics and DNA Repair.
Nikhil RanjanVimal PandeyManas Kumar PanigrahiLukas KlumppUlrike NaumannPhanithi Prakash BabuPublished in: Cancers (2021)
Glioblastoma (GBM) is a highly aggressive brain tumor. Resistance mechanisms in GBM present an array of challenges to understand its biology and to develop novel therapeutic strategies. We investigated the role of a TSG, MTUS1/ATIP1 in glioma. Glioma specimen, cells and low passage GBM sphere cultures (GSC) were analyzed for MTUS1/ATIP1 expression at the RNA and protein level. Methylation analyses were done by bisulfite sequencing (BSS). The consequence of chemotherapy and irradiation on ATIP1 expression and the influence of different cellular ATIP1 levels on survival was examined in vitro and in vivo. MTUS1/ATIP1 was downregulated in high-grade glioma (HGG), GSC and GBM cells and hypermethylation at the ATIP1 promoter region seems to be at least partially responsible for this downregulation. ATIP1 overexpression significantly reduced glioma progression by mitigating cell motility, proliferation and facilitate cell death. In glioma-bearing mice, elevated MTUS1/ATIP1 expression prolonged their survival. Chemotherapy, as well as irradiation, recovered ATIP1 expression both in vitro and in vivo. Surprisingly, ATIP1 overexpression increased irradiation-induced DNA-damage repair, resulting in radio-resistance. Our findings indicate that MTUS1/ATIP1 serves as TSG-regulating gliomagenesis, progression and therapy resistance. In HGG, higher MTUS1/ATIP1 expression might interfere with tumor irradiation therapy.
Keyphrases
- poor prognosis
- dna damage
- dna repair
- cell death
- high grade
- induced apoptosis
- binding protein
- cell proliferation
- cell cycle arrest
- oxidative stress
- dna methylation
- stem cells
- single cell
- adipose tissue
- locally advanced
- radiation induced
- type diabetes
- staphylococcus aureus
- small molecule
- mesenchymal stem cells
- low grade
- escherichia coli
- high throughput
- skeletal muscle
- high glucose
- free survival
- nucleic acid