Abstract
Macrophages are innate immune cells that contribute to classical immune functions and tissue homeostasis. Ubiquitin-specific protease 2 (USP2) controls cytokine production in macrophages, but its organ-specific roles are still unknown. In this study, we generated myeloid-selective Usp2 knockout (msUsp2KO) mice and specifically explored the roles of testicular macrophage-derived USP2 in reproduction. The msUsp2KO mice exhibited normal macrophage characteristics in various tissues. In the testis, macrophage Usp2 deficiency negligibly affected testicular macrophage subpopulations, spermatogenesis, and testicular organogenesis. However, frozen–thawed sperm derived from msUsp2KO mice exhibited reduced motility, capacitation, and hyperactivation. In addition, macrophage Usp2 ablation led to a decrease in the sperm population exhibiting high intracellular pH, calcium influx, and mitochondrial membrane potential. Interrupted pronuclei formation in eggs was observed when using frozen–thawed sperm from msUsp2KO mice for in vitro fertilization. Administration of granulocyte macrophage-colony stimulating factor (GM-CSF), whose expression was decreased in testicular macrophages derived from msUsp2KO mice, restored mitochondrial membrane potential and total sperm motility. Our observations demonstrate a distinct role of the deubiquitinating enzyme in organ-specific macrophages that directly affect sperm function.
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Availability of data and material
The datasets in this study are available from the corresponding author upon reasonable request.
Code availability
All software used in this study was obtained legally, and custom code is available from the corresponding author on reasonable request.
Abbreviations
- ALDH1A2:
-
Aldehyde dehydrogenase 1a2
- ALH:
-
Amplitude of lateral head displacement
- Ar :
-
Androgen receptor
- BCF:
-
Beat-cross frequency
- BSA:
-
Bovine serum albumin
- CASA:
-
Computer-assisted sperm motility analysis
- CSF1R:
-
Colony-stimulating factor 1 receptor
- CSF2Rα:
-
Colony-stimulating factor 2 receptor α chain
- CTC:
-
Chlortetracycline
- DDX:
-
DEAD-box helicase
- FACS:
-
Fluorescence-activated cell sorting
- GM-CSF:
-
Granulocyte macrophage-colony stimulating factor
- HSD3B:
-
3-β-Hydroxysteroid dehydrogenase
- Hvcn1 :
-
Voltage-gated hydrogen channel1
- IL:
-
Interleukin
- iNOS:
-
Inducible nitric oxide synthase
- IVF:
-
In vitro fertilization
- KD:
-
Knockdown
- KO:
-
Knockout
- Lhcgr :
-
Luteinizing hormone receptor
- LyzM-Cre :
-
B6.129P2-Lyzstm1(cre)Ifo
- M-CSF:
-
Macrophage-colony stimulating factor
- MCT:
-
Monocarboxylate transporter
- MHCII:
-
Major histocompatibility complex class II
- MMP:
-
Mitochondrial membrane potential
- OXPHOS:
-
Oxidative phosphorylation
- PI:
-
Propidium iodide
- Q-FISH:
-
Quantitative-fluorescent in situ hybridization
- qRT-PCR:
-
Quantitative reverse transcription-polymerase chain reaction
- R26GRR:
-
C57BL/6 N-Gt(ROSA)26Sortm1(CAG−EGFP,tdsRed)Utr/Rbrc
- RDH10:
-
Retinol dehydrogenase 10
- Slc9c1 :
-
Solute carrier family 9 member C1
- Sox:
-
Sex-determining region Y-box transcription factor
- Stra8 :
-
Stimulated by retinoic acid 8
- TMB:
-
3,3′,5,5′-Tetramethylbenzidine
- TNF:
-
Tumor necrosis factor
- TREM:
-
Tetramethylrhodamine methyl ester
- USP:
-
Ubiquitin-specific protease
- VCL:
-
Curvilinear velocity
- VSL:
-
Straight-line velocity
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Acknowledgements
The authors would like to thank Dr. Keiji Ueno, Mr. Takeshi Ishino, Ms. Misato Amagasa, Ms. Aya Iida, and Ms. Marina Tanaka from Rakuno Gakuen University, and Dr. Yuko Okamatsu from Hokkaido University. The authors also acknowledge the editing services provided by Uni-edit.
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This work was supported by the Japan Society for the Promotion of Science KAKENHI (15K06805 and 18K06035) and the Rakuno Gakuen University Research Fund (No. 2018-02, 2019-03, and 2020-04).
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MH and SK performed the experiments, analyzed the data, and wrote and revised the manuscript. CK, YY, TW, and ET performed the experiments. JO revised the manuscript. MN designed and performed the experiments and revised the manuscript. HK designed and performed the experiments, analyzed data, and wrote and revised the manuscript. All authors read and approved the final version of the manuscript.
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All animal experiments were approved by the Ethical Review Committee for Animal Experimentation of Rakuno Gakuen University (Approval Numbers VH15A30, VH16A25, VH17A1). We made all efforts to reduce the number of animals used, and to alleviate their suffering.
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Hashimoto, M., Kimura, S., Kanno, C. et al. Macrophage ubiquitin-specific protease 2 contributes to motility, hyperactivation, capacitation, and in vitro fertilization activity of mouse sperm. Cell. Mol. Life Sci. 78, 2929–2948 (2021). https://doi.org/10.1007/s00018-020-03683-9
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DOI: https://doi.org/10.1007/s00018-020-03683-9