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Mycobacterium marinum Infection in Zebrafish and Microglia Imitates the Early Stage of Tuberculous Meningitis

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Abstract

Mycobacterium tuberculosis (M. tuberculosis) invading and activating microglia causes the most serious subtypes of tuberculosis called tubercular meningitis. However, the developmental process of tubercular meningitis, especially the early phase, is poorly understood due to lacking well-established and well-accepted visible models in vitro and in vivo. Here, consistent with one recent report, we found Mycobacterium marinum (M. marinum) invade the zebrafish brain and subsequently cause granuloma-like structures. We further showed that M. marinum, which shares similar characteristics with M. tuberculosis, can invade microglia and replicate in microglia, which subsequently promote the secretion of pro-inflammatory cytokines such as IL-1β, IL-6, and TNF-α. M. marinum infection in microglia can also promote autophagy, which conversely limits the replication of M. marinum. Thus, pharmacological activation of autophagy by rapamycin could prevent M. marinum replication. Our study provides in vivo and in vitro models to study underlying pathogenic mechanisms of tubercular meningitis by using M. marinum. Our results also showed that activation of autophagy could be a meaningful way to prevent tubercular meningitis.

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Acknowledgements

We thank Dr. Dong Liu (Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University) for the injection of zebrafish.

Funding

This work was supported by the National Natural Science Foundation of China (grant numbers: 81201252, 81771767), a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), a project funded by the Natural the Scientific Research Programme of Jiangsu Province (13KJB310013), and a project funded by the Scientific Research Programme of Nantong (MS12016007, MS12016009).

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Correspondence to Yi-hui Fan or Yong-wei Qin.

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The authors declare that they have no conflicts of interest.

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Fig. S1

The bacterial cord and granuloma-like structures were not observed in the non-infected zebrafish nerve system. (GIF 47 kb)

High-resolution image (TIFF 2193 kb)

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Chen, Z., Shao, Xy., Wang, C. et al. Mycobacterium marinum Infection in Zebrafish and Microglia Imitates the Early Stage of Tuberculous Meningitis. J Mol Neurosci 64, 321–330 (2018). https://doi.org/10.1007/s12031-018-1026-1

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  • DOI: https://doi.org/10.1007/s12031-018-1026-1

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