Neuroinflammation: an unfortunate term to describe schizophrenia.

Schizophrenia, a chronic psychiatric disorder, has prompted extensive research into its immunological aspects. Studies in genetics, epidemiology, and treatment have revealed immune changes associated with schizophrenia, including shifts in cytokine levels and microglial reactivity within the central nervous system (CNS). However, the term "neuroinflammation" has been used to describe these findings despite inconsistent classical markers, potentially oversimplifying the complex role of immune mediators in neurodevelopment and brain homeostasis. In this paper, we critically examine the limitations of applying "neuroinflammation" to describe immune changes in schizophrenia, focusing on its four classical hallmarks: elevated cytokines, microglial reactivity, peripheral immune cell infiltration, and neurodegeneration. While some alterations in these markers are reported, many findings fall within clinical norms or likely contribute to neurodevelopment, suggesting that the term "neuroinflammation" may misrepresent their role. Instead, we propose using alternative terminology that reflects the broader spectrum of CNS immune responses, both inflammatory and non-inflammatory, and invite the scientific community to join this dialogue to refine terminology. By reframing immune alterations in schizophrenia, we aim to promote accuracy and consistency across medical disciplines, ensuring terminology that accurately represents the underlying biology. This, in turn, will improve communication among researchers and clinicians.