At 10 mg/mL, 20 units delivers a full 2.0 mg
83 However, within the tumor niche, cancer cells, MDSCs, TAMs, suppressive DCs, and cancer-associated fibroblasts, among other cell types, exhibit upregulated expression of indoleamine 2,3-dioxygenase (IDO), which metabolizes tryptophan into suppressive kynurenine to promote Tregs and suppress CD8 + T cell function
This may be partly due to lower total antioxidant activity in these patients, particularly the decrease in SOD and CAT activities (24, 25)
Crucially, Crat knockout experiments partially reversed these metabolic improvements, establishing CrAT-mediated SREBP1c inhibition as a key mechanism through which L-carnitine counteracts de novo lipogenesis
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