期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/ijms232113609
关键词
cell wall; electron microscopy; lipid inclusions; intrabacterial; mycobacterium; ultrastructural imaging
资金
- Spanish Ministry of Science, Innovation and Universities, Spain
- European Regional Development Fund (FEDER), European Union [RTI2018-098777-B-I00, PID2021-122331OB-I00]
- AGAUR-Generalitat de Catalunya [2017SGR-229]
This study compared the lipid profiles of the nonpathogenic immunomodulatory agent Mycobacterium brumae under different culture conditions and found that the lipid composition and dynamics were related to pellicle maturation and the culture media used. The lipid synthesis in M. brumae showed high plasticity and versatility under different culture conditions.
The immunomodulatory potential of mycobacteria to be used for therapeutic purposes varies by species and culture conditions and is closely related to mycobacterial lipid composition. Although the lipids present in the mycobacterial cell wall are relevant, lipids are mainly stored in intracellular lipid inclusions (ILIs), which have emerged as a crucial structure in understanding mycobacteria-host interaction. Little is known about ILI ultrastructure, production, and composition in nonpathogenic species. In this study, we compared the lipid profiles of the nonpathogenic immunomodulatory agent Mycobacterium brumae during pellicle maturation under different culture conditions with qualitative and quantitative approaches by using high-resolution imaging and biochemical and composition analyses to understand ILI dynamics. The results showed wax esters, mainly in early stages of development, and acylglycerols in mature ILI composition, revealing changes in dynamics, amount, and morphometry, depending on pellicle maturation and the culture media used. Low-glycerol cultures induced ILIs with lower molecular weights which were smaller in size in comparison with the ILIs produced in glycerol-enriched media. The data also indicate the simple metabolic plasticity of lipid synthesis in M. brumae, as well as its high versatility in generating different lipid profiles. These findings provide an interesting way to enhance the production of key lipid structures via the simple modulation of cell culture conditions.
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