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Adolescent nicotine use is particularly concerning due to increased susceptibility to long-term effects and dependence during this critical developmental period. This study investigates the therapeutic effects of thiamine on nicotine withdrawal-induced anxiety, anhedonia, and depression in rats. Adolescent rats received nicotine (2 mg/kg, s.c.) for 21 days, followed by 21 days of withdrawal. Thiamine (25 mg/kg or 50 mg/kg, i.p.) was administered during exposure and withdrawal. Behavioral assessments were used to evaluate anxiety- and depressive-like symptoms, and biochemical analyses measured oxidative stress markers, serotonin levels, MAO activity, BDNF, and GFAP as indicators of neuroinflammation in the prefrontal cortex (PFC). Nicotine withdrawal significantly elevated anxiety-, depression-, and anhedonia-like behaviors, increased oxidative stress, and upregulated MAO-A activity and GFAP expression, indicating neuroinflammatory effects. Notably, thiamine administration during both nicotine exposure and ...

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