Abstract
The dual-specificity phosphatase (DUSP) 13 gene encodes two atypical DUSPs, DUSP13B/TMDP and DUSP13A/MDSP using alternative exons. DUSP13B protein is most highly expressed in testis, particularly in spermatocytes and round spermatids of the seminiferous tubules, while that of DUSP13A is restricted to skeletal muscle. Here, we show that DUSP13B inactivated MAPK activation in the order of selectivity, JNK = p38>ERK in cells, while DUSP13A did not show MAPK phosphatase activity. Reporter gene analysis showed that DUSP13B had significant inhibitory effect on AP-1-dependent gene expression, but DUSP13A did not. To our knowledge, DUSP13B is the first identified testis-specific phosphatase that inhibits stress-activated MAPKs. These data suggest an important role for DUSP13B in protection from external stress during spermatogenesis.
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Abbreviations
- DUSP:
-
Dual-specificity phosphatase
- TMDP:
-
Testis- and skeletal muscle-specific DUSP
- MDSP:
-
Muscle-restricted DUSP
- MAP:
-
Mitogen-activated protein
- MAPK:
-
MAP kinase
- ERK:
-
Extracellular signal-regulated kinase
- JNK:
-
c-Jun N-terminal kinase
- AP-1:
-
Activating protein 1
- SRE:
-
Serum responsive element
- Luc:
-
Luciferase
- SEK1:
-
SAPK/ERK kinase 1
- MKK3:
-
MAPK kinase 3
- GST:
-
Glutathione S-transferase
- MKP:
-
MAP kinase phosphatase
- VHR:
-
VH1-related
- HA:
-
Hemagglutinin
- PBS:
-
Phosphate-buffered saline
- PMA:
-
12-O-tetradecanoylphorbol-13-acetate
- DAPI:
-
4′,6-diamidino-2-phenylindole
- pNPP:
-
P-nitrophenyl phosphate
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Acknowledgments
We thank Dr. J. Magae (Institute of Research and Innovation, Kashiwa, Japan) and N.H. Heintz (University of Vermont, Burlington, VT) for providing us with pCMV-β-galactosidase. We thank Dr. M. Karin (University of California, San Diego) for pSRα-HA-ERK2. We thank Dr. M. Takekawa (Nagoya University) for pEBG-SEK1 and pEBG-MKK3. We thank Dr. T. Koda (Hokkaido University) for the anti-GST antibody. Thanks are also due to N. Sasaki for secretarial assistance. This work was supported in part by grants-in-aid for Scientific Research provided by the Japan Society for the Promotion of Science (to H.S., Y.Y., K.S., N.T., and M.S.).
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Chiaki Katagiri and Kouhei Masuda contributed equally to this work.
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Katagiri, C., Masuda, K., Nomura, M. et al. DUSP13B/TMDP inhibits stress-activated MAPKs and suppresses AP-1-dependent gene expression. Mol Cell Biochem 352, 155–162 (2011). https://doi.org/10.1007/s11010-011-0749-x
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DOI: https://doi.org/10.1007/s11010-011-0749-x