Protein name Gene name Change in expression Microarray experiment
↓Aldolasea A and B ↓ALDOA, ALDOB ↓↑
↓ATP synthasea beta subunit ↓ATP5D ↓↑
↓Cytochrome c oxidase subunit Vib ↓COX6B ↓↓ ↓↑
↓Dimethyl arginine dimethyl aminohydrolase ↓DDAH1 ↓↓ ↓↓
↓Enolasea 1 ↓ENO1 ↓M ↓↑
↓Glyceraldehyde 3 phosphate dehydrogenasea ↓GAPDH ↓↑ ↓↑
↓Phosphoglycerate kinasea 1 ↓PGK1 ↓M ↓↑
↓Protein disulfide isomerase ↓P4HB ↓↑ ↓↑
↓Pyruvate kinase M2 isozyme ↓PKM2 ↓M
↓Thioredoxin domain 5 isoform 2 ↓TXNDC5 ↓↑
↓Triose phosphate isomerase ↓TPI1 ↓M ↓↑
Host cell proteins were designated as being downregulated in expression (↓), upregulated (↑), or modulated (M). aThese host cell proteins also changed expression in the brains of patients with mild cognitive impairement, early AD, or AD [369]. It must be noted that T. gondii tachyzoites are thought to rely upon both glycolysis and the tricarboxylic acid cycle, while bradyzoites are largely dependent upon glycolysis [364,371]. Although tachyzoites utilize both glycolysis and oxidative phosphorylation to obtain energy, glycolysis seems to be the predominant pathway for ATP synthesis in the bradyzoite [372,373]. Moreover, ENO2 and lactate dehydrogenase1 are only found in tachyzoites, while ENO1 and lactate dehydrogenase 2 are exclusively expressed in bradyzoites [374,375]. Silencing of tachyzoite ENO2 altered nuclear targeting of bradyzoite ENO1 in T. gondii [376,377].
Table 17: Selected modifications in the proteomes of human foreskin fibroblasts infected with T. gondii: proteins implicated in glycolysis Nelson et al. [368]; with own modification).