As mentioned, the dysregulation of dopamine systems is key to the pathology of schizophrenia. Several other neurotransmitter systems are also linked, as is outlined on the slide.
References:
Sadock BJ, Sadock VA, Ruiz P (eds). Kaplan & Sadock’s comprehensive textbook of psychiatry. 9th Edition. Vol 1–2. © Lippincott Williams & Wilkins, 2009.
Santini MA, Ratner C, Aznar S, et al. Enhanced prefrontal serotonin 2A receptor signaling in the subchronic phencyclidine mouse model of schizophrenia. J Neurosci Res 2013; 91 (5): 634–641.
Vollenweider FX, Vollenweider-Scherpenhuyzen MF, Bäbler A, et al. Psilocybin induces schizophrenia-like psychosis in humans via a serotonin-2 agonist action. Neuroreport 1998; 9 (17): 3897–3902.