Expression of heterogeneous nuclear ribonucleo-protein A2B1 in mouse cerebellar development and human medulloblastoma
10.3760/cma.j.issn.0529-5807.2019.09.006
- VernacularTitle: 异质性细胞核核糖蛋白A2B1在小鼠小脑发育与人髓母细胞瘤中的表达
- Author:
Shunli ZHAO
1
,
2
;
Fu ZHAO
3
;
Qing LI
1
,
2
;
Jing ZHANG
3
;
Zhiwei ZHANG
1
,
2
;
Chunde LI
3
;
Pinan LIU
3
;
Weimin TONG
1
,
2
;
Yamei NIU
1
,
2
Author Information
1. Department of Pathology, Institute of Basic Medical Sciences Chinese Academy of Medical Science, School of Basic Medicine, Peking Union Medical College
2. Molecular Pathology Center, Chinese Academy of Medical Sciences, Beijing 100005, China
3. Department of Neurosurgery, Tiantan Hospital, Capital Medical University, Beijing 100050, China
- Publication Type:Journal Article
- Keywords:
Medulloblastoma;
Ribonucleoproteins;
Cerebellar cortex;
Animal testing alternatives;
Mice, Inbred C57BL
- From:
Chinese Journal of Pathology
2019;48(9):694-699
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the expression and potential role of heterogeneous nuclear ribonucleo-protein A2B1 (HNRNPA2B1) in mouse cerebellar development and the significance of HNRNPA2B1 in human medulloblastoma.
Methods:The data of HNRNPA2B1 RNA expression in mouse and human cerebella were obtained from databases. Western blot and immunohistochemical staining were performed to detect the protein level of HNRNPA2B1 in mouse cerebella at different ages. The expression level of HNRNPA2B1 in control human cerebellum and medulloblastoma was detected by immunohistochemical staining. m6A-IP-qPCR method was applied to confirm whether HNRNPA2B1 RNA in Daoy cells was modified with m6A.Western blot was used to detect the effect of MG132 treatment on the HNRNPA2B1 protein level in Daoy cells.
Results:The level of HNRNPA2B1 protein in postnatal mouse cerebella was higher than that in adult mouse cerebella, with weak HNRNPA2B1 staining in external granular cells while strong staining in mature Purkinje cells and molecular layer. Compared with control normal human cerebella, the RNA expression level of HNRNPA2B1 increased in medulloblastoma, while immunohistochemical staining showed that the mean intensity of HNRNPA2B1 decreased in medulloblastoma. HNRNPA2B1 RNA in medulloblastoma and Daoy cells was modified by m6A. The HNRNPA2B1 protein level in Daoy cells increased upon MG132 treatment.
Conclusions:HNRNPA2B1 is dynamically expressed during mouse cerebellar development. Compared with normal human cerebella, HNRNPA2B1 is significantly up-regulated at transcriptional level but obviously down-regulated at translational level in medulloblastoma. These results indicate that HNRNPA2B1 may be involved in cerebellar development process and medulloblastoma tumorigenesis. The m6A methylation in HNRNPA2B1 transcript and protein ubiquitin-proteasome pathway may account for the down-regulation of HNRNPA2B1 at protein level.