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. Author manuscript; available in PMC: 2010 Jul 26.
Published in final edited form as: Neurol Clin. 2006 Aug;24(3):441–460. doi: 10.1016/j.ncl.2006.03.003

Fig. 3.

Fig. 3

The two-hit model of cytokine-induced depression. Production of proinflammatory cytokines induces sickness behavior that usually is terminated by endogenous anti-inflammatory molecules. Sustained production of proinflammatory cytokines in the context of insufficient production of anti-inflammatory molecules can lead to depression in vulnerable individuals. Many factors, acquired or genetic, can contribute to vulnerability.