Autism Spectrum Disorder is a neurodevelopmental condition characterized by difficulties in social communication, repetitive behaviors, and a wide range of cognitive outcomes. The prevalence of ASD has increased globally, placing growing pressure on healthcare systems, education providers, and families. While genetics play a central role, no single cause explains the condition. In recent years, scientists have increasingly focused on the immune system as a potential contributor, particularly chronic inflammation and immune signaling molecules known as cytokines.
The study by Naji adds important clinical data to this discussion. It examined 100 children aged 1 to 12 years diagnosed with ASD and compared them with 30 age-matched healthy children. All participants underwent psychiatric assessment, and autism severity was measured using the Childhood Autism Rating Scale (CARS), a widely used clinical tool. Blood samples were analyzed to assess immune cell function, cytokine levels, and antibody concentrations.
Rather than focusing on genetics alone, the research looked at how immune activity differs in children with autism. The results revealed a consistent pattern of immune imbalance. Children with ASD showed significantly higher levels of pro-inflammatory cytokines, particularly interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), and interferon-gamma (IFN-γ). These molecules play key roles in activating immune responses and are commonly associated with inflammation.
Among these markers, IL-6 stood out. Higher IL-6 levels were strongly associated with more severe autism symptoms as measured by CARS scores. This suggests that systemic inflammation may be linked to how intensely autism manifests in some children, rather than being a coincidental finding.
At the same time, the study found reduced activity in natural killer (NK) cells, an important component of the body’s first line of immune defense. Although the number of NK cells in children with ASD was similar to that of healthy controls, their ability to destroy infected or abnormal cells was significantly impaired. This functional weakness may help explain why some children with autism experience frequent infections or prolonged inflammatory responses.
The research also identified disruptions in regulatory cytokines, including IL-27 and IL-37. These molecules normally help control excessive immune reactions and limit inflammation. Altered levels of these cytokines indicate that immune regulation in children with ASD may be compromised, allowing inflammatory processes to persist longer than they should.
In addition to cytokines, the study assessed immunoglobulins, which reflect the adaptive immune system’s ability to produce antibodies. Levels of IgG and IgM were significantly lower in children with ASD compared to healthy children. This finding points to a selective weakness in humoral immunity, while other antibodies such as IgA and IgE showed no meaningful differences between groups.
Taken together, these results support an “immunogenetic” framework for understanding autism. In this view, genetic susceptibility interacts with immune dysfunction, leading to inflammatory signaling that may affect early brain development. Naji emphasizes that immune abnormalities should not be seen as isolated findings but as part of a broader biological network influencing neurodevelopment.
“The observed cytokine imbalance suggests persistent immune activation and disrupted immune regulation in children with ASD,” Naji explains, noting that such conditions may contribute to neuroinflammatory pathways during critical periods of brain growth.
The study also explored immune differences in children who experienced developmental regression, a condition in which previously acquired language or social skills are lost. Variations in certain cytokines, including IL-29, suggest that immune mechanisms may play a role in this phenomenon, although further research is needed to clarify the relationship.
From a methodological perspective, the research used a case–control design with standardized clinical assessments and laboratory analysis. Ethical approval was obtained, and all parents or guardians provided informed consent. Statistical analysis ensured that reported differences were significant and not due to random variation.
The implications of these findings are substantial. For clinicians, immune profiling could one day help identify biologically distinct subtypes of autism, supporting earlier diagnosis and more personalized intervention strategies. For researchers, the study highlights immune pathways as potential therapeutic targets, opening the door to treatments that address inflammation alongside behavioral and educational therapies.
From a public health and policy perspective, the results underscore the importance of integrating medical monitoring into autism care. Supporting immune health, managing inflammation, and reducing biological stressors may complement existing interventions and improve long-term outcomes for children with ASD.
Despite its strengths, the study has limitations. The sample size, while substantial, is still relatively small for drawing universal conclusions. In addition, the immune system is highly complex and influenced by environmental factors, stress, and infections. As Naji notes, it remains unclear whether immune dysfunction causes autism-related changes or emerges as a consequence of living with the condition.
The author calls for larger, multi-center studies that combine genetic analysis with immune profiling to better understand how these systems interact over time. Such research could help transform autism care from a primarily behavioral approach into a more integrated biomedical model.
Author Profile
Rana Abdulrazzaq Naji, is a researcher in immunology and health sciences at Çankırı Karatekin University, Çankırı, Turkey. Her expertise focuses on immunogenetics, cytokine regulation, and immune mechanisms in neurological and developmental disorders.
Source
- Naji, R. A. Immunogenetic and Cytokine Profile Alterations in Autism Spectrum Disorder: A Clinical Study.
- International Journal of Natural and Health Sciences, Vol. 4, No. 1, 2026.
- DOI: https://doi.org/10.59890/ijnhs.v4i1.174
- Official journal URL: https://aprmultitechpublisher.my.id/index.php/ijnhs
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