2. Academic Validation
  3. Toxoplasma gondii sustains survival by regulating cholesterol biosynthesis and uptake via SREBP2 activation

Toxoplasma gondii sustains survival by regulating cholesterol biosynthesis and uptake via SREBP2 activation

  • J Lipid Res. 2024 Dec;65(12):100684. doi: 10.1016/j.jlr.2024.100684.
Yi-Min Fan 1,  Qing-Qi Zhang 2,  Ming Pan 2,  Zhao-Feng Hou 2,  Lizhi Fu 3,  Xiulong Xu 2,  Si-Yang Huang 4
Affiliations

Affiliations

  • 1 Institute of Comparative Medicine, College of Veterinary Medicine, Yangzhou University, and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, and Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu Province, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, PR China.
  • 2 Institute of Comparative Medicine, College of Veterinary Medicine, Yangzhou University, and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, and Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu Province, PR China.
  • 3 Chongqing Academy of Animal Sciences, Chongqing, PR China.
  • 4 Institute of Comparative Medicine, College of Veterinary Medicine, Yangzhou University, and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, and Jiangsu Key Laboratory of Zoonosis, Yangzhou, Jiangsu Province, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, PR China; Chongqing Academy of Animal Sciences, Chongqing, PR China. Electronic address: siyang.huang@hotmail.com.
PMID: 39490926 DOI: 10.1016/j.jlr.2024.100684
Abstract

Toxoplasma gondii (T. gondii) is an obligate intracellular Parasite that cannot biosynthesize Cholesterol via the mevalonate pathway, it sources this lipid from its host. We discovered that T. gondii Infection upregulated the expression of host Cholesterol synthesis-related genes HMG-CoA reductase(HMGCR), squalene epoxidase (SQLE), and dehydrocholesterol reductase-7 (DHCR7), and increased the uptake pathway gene low-density lipoprotein receptor (LDLR). We found a protein, sterol regulatory element binding protein 2 (SREBP2), which is the key protein regulating the host Cholesterol synthesis and uptake during T. gondii Infection. T. gondii induced a dose-dependent nuclear translocation of SREBP2. Knockdown SREBP2 reduced T. gondii-induced Cholesterol biosynthesis and uptake. Consequently, the parasite's ability to acquire Cholesterol was significantly diminished, impairing its invasion, replication, and bradyzoites development. Interfering Cholesterol metabolism using AY9944 effectively inhibited T. gondii replication. In summary, SREBP2 played an important role in T. gondii Infection in vitro, serving as a potential target for regulating T. gondii-induced Cholesterol metabolism, offering insights into the prevention and treatment of toxoplasmosis.

Keywords

HMGCR; LDLR; SQLE; SREBP2; Toxoplasma gondii; cholesterol.

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