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Yıl:2008; Cilt: 10; Sayı: 2>> Özet
Türkiye'de Psikiyatri; 2008;10(2):52-56
Otistik Bozukluğu Olan Çocuklarda TNF-Alfa Düzeyi
E Güney, E İşeri, A Atak, A Aral, Ş Bodur, Ş Şener
Gazi Üniversitesi Tıp Fakültesi Çocuk Psikiyatrisi AD, Ankara
Amaç: Otizmin nedeni halen net olarak bilinmemektedir fakat nörolojik, immünolojik, çevresel ve genetik
faktörlerin etkileşimiyle oluşan multifaktoriyel bir bozukluk olduğu düşünülmektedir. Otizmde immünolojik
fonksiyon bozukluğunun bulunduğuna dair kanıtlar giderek artmaktadır. Son araştırmalar immün sistem
ve sinir sistemi arasındaki bağlantıyı ortaya çıkarmıştır. Otistik çocuklarda çeşitli immün anormalliklerin
olduğu gösterilmiştir. İnterlökin (IL)-1, IL-6, IL-12, interferon (IFN)-gama ve tümör nekrozis faktör-alfa’yı
(TNF-alfa) içeren proinflamatuar sitokinlerdeki artışın otizmin patofizyolojisinde rol oynayabileceği bildirilmektedir.
TNF- beyin gelişiminde önemli rolü olan immünomodülatör bir sitokindir ve glutamaterjik iletimi
düzenleyerek nöronlarda ve nörogliyal hücrelerde de rol oynayabilir. Bu çalışmada , TNF-’nın otizmin
patofizyolojisinde rol oynayabileceği hipotezinden yola çıkarak otistik çocuklarda serum TNF-alfa düzeylerinin
incelenmesi amaçlanmıştır.
Metod: 27 otistik çocuk ve yaş ve cinsiyet yönünden eşleştirilen 28 sağlıklı kontrol grubunda serum TNFalfa
düzeyleri ölçülmüştür. Gruplar arasındaki farklılıklar bağımsız gruplar t testi ile değerlendirilmiştir. Otistik
çocuklar arasında serum TNF-alfa düzeyleri ve klinik değişkenler arasındaki korelasyon pearson korelasyon
testi ile analiz edilmiştir.
Sonuçlar: Otistik çocuklar ve normal kontrol grubu arasında serum TNF-alfa düzeyleri açısından anlamlı fark
saptanmamıştır. Otizmin şiddeti, doğum kilosu, doğum haftası, anne sütü alım süresi gibi klinik değişkenler
ve serum TNF-alfa düzeyleri arasında anlamlı ilişki bulunmamıştır.
Tartışma: Çalışma sonuçları TNF-alfa düzeyinin otistik çocuklar ve kontrol grubu arasında fark göstermediğini
ortaya koymaktadır. Otizimin etyolojisinde immünolojik faktörlerin rolünün belirlenmesi için daha ileri
çalışmalara ihtiyaç vardır.
Serum TNF-Alfa Levels in Autistic Children
Objective: The etiology of autism is unclear however autism is considered as a multifactorial disorder that is influenced by neurological, environmental,
immunological and genetic factors. There is mounting evidence of immune dysregulation in autistic individuals and recent researches
are revealing the link between the immune system and nervous system. Various immune abnormalities have been reported in children
with autism. Is is suggested that increased production of proinflammatory cytokines, including interleukin (IL)-1, IL-6, IL-12, interferon (IFN)-gama
and tumör necrosis factor-alfa (TNF-), could play a role in the pathophysiology of autism. TNF- may play a role in neurons and neuroglial
cells modulating glutaminergic transmission. The role of TNF- as a neuromodulating agent has been described in brain development. In this
study we hypothesized that TNF- may play a role in the pathophysiology of autism and examined serum TNF- levels in children with autism.
Method: We measured serum levels of TNF- in the 27 autistic children and 28 age- matched normal controls. Differences between groups
were tested using independent samples T test for unrelated samples. Correlations between serum EGF levels and clinical variables between
subjects with autism are analyzed with Pearson Correlation Test.
Results: We found that serum levels of TNF- in the subjects with autism did not differ from those of age and sex-matched normal controls.
There were no significant correlations between serum EGF levels and clinical variables, including severity of behaviors associated with autism,
gestational age, birth weight, breast feeding duration.
Discussion: Our results do not support the claim that TNF- plays a role in the pathogenesis of autism. So, further studies are necessary to evaluate
the contribution of immunologic factors to autism.

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