Gadd45a deletion aggravates hematopoietic stem cell dysfunction in ATM-deficient mice
Ataxia telangiectasia mutated （ATM） kinase plays an essential role in the maintenance of genomic stability. ATM-deficient （ATM-/-） mice exhibit hematopoietic stem cell （HSC） dysfunction and a high incidence of lym- phoma. Gadd45a controls cell cycle arrest, apoptosis and DNA repair, and is involved...
Saved in:
| Published in: | Protein & cell Vol. 5; no. 1; pp. 80 - 89 |
|---|---|
| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Beijing
Higher Education Press
2014
Springer Nature B.V |
| Subjects: | |
| ISSN: | 1674-800X, 1674-8018, 1674-8018 |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Ataxia telangiectasia mutated （ATM） kinase plays an essential role in the maintenance of genomic stability. ATM-deficient （ATM-/-） mice exhibit hematopoietic stem cell （HSC） dysfunction and a high incidence of lym- phoma. Gadd45a controls cell cycle arrest, apoptosis and DNA repair, and is involved in the ATM-p53 mediated DNA damage response. However, the role of Gadd45a in regulating the functionality of ATM-/- HSCs is unknown. Here we report that Gadd45a deletion did not rescue the defects of T-cells and B-cells development in ATM-/- mice. Instead, ATM and Gadd45a double knockout （ATM-/- Gadd45a-/-） HSCs exhibited an aggravated defect in long-term self-renewal capacity compared to ATM-/- HSCs in HSC transplantation experiments. Fur- ther experiments revealed that the aggravated defect of ATM-/- Gadd45a-/- HSCs was due to a reduction of cell proliferation, associated with an accumulation of DNA damage and subsequent activation of DNA damage response including an up-regulation of p53-p21 signal- ing pathway. Additionally, ATM-/- Gadd45a-/- mice showed an increased incidence of hematopoietic malignancies, as well as an increased rate of metastasis than ATM-/- mice. In conclusion, Gadd45a deletion aggravated the DNA damage accumulation, which sub- sequently resulted in a further impaired self-renewal capacity and an increased malignant transformation in ATM-/- HSCs. |
|---|---|
| Bibliography: | Gadd45a, ATM, hematopoietic stem cellsDNA damage Ataxia telangiectasia mutated （ATM） kinase plays an essential role in the maintenance of genomic stability. ATM-deficient （ATM-/-） mice exhibit hematopoietic stem cell （HSC） dysfunction and a high incidence of lym- phoma. Gadd45a controls cell cycle arrest, apoptosis and DNA repair, and is involved in the ATM-p53 mediated DNA damage response. However, the role of Gadd45a in regulating the functionality of ATM-/- HSCs is unknown. Here we report that Gadd45a deletion did not rescue the defects of T-cells and B-cells development in ATM-/- mice. Instead, ATM and Gadd45a double knockout （ATM-/- Gadd45a-/-） HSCs exhibited an aggravated defect in long-term self-renewal capacity compared to ATM-/- HSCs in HSC transplantation experiments. Fur- ther experiments revealed that the aggravated defect of ATM-/- Gadd45a-/- HSCs was due to a reduction of cell proliferation, associated with an accumulation of DNA damage and subsequent activation of DNA damage response including an up-regulation of p53-p21 signal- ing pathway. Additionally, ATM-/- Gadd45a-/- mice showed an increased incidence of hematopoietic malignancies, as well as an increased rate of metastasis than ATM-/- mice. In conclusion, Gadd45a deletion aggravated the DNA damage accumulation, which sub- sequently resulted in a further impaired self-renewal capacity and an increased malignant transformation in ATM-/- HSCs. 11-5886/Q Gadd45a Document accepted on :2013-12-25 ATM Document received on :2013-12-19 hematopoietic stem cells DNA damage SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 1674-800X 1674-8018 1674-8018 |
| DOI: | 10.1007/s13238-013-0017-9 |