Modulatory effects of traditional Chinese medicine and derived active metabolites on autoimmune-inflammatory signaling pathways in multiple sclerosis: a narrative review - Die Qian; Xiaohong Li; Jingjing Ge; Shuai Liu; Mingmin Na; Maokui Huang; Qingyan Mo; Mingqian Ju; Chunping Wan (Frontiers in Pharmacology, 2026)