Journals / Nöropsikiyatri Arşivi / 2012 / Cilt: 49 - Sayı: 2

Experimental chronic toxoplasmosis model in mice: Brain lesions and related behavioral changes

Deneysel kronik toksoplazmoz fare modeli: Beyin lezyonlarının davranış değişiklikleri ile ilişkilendirilmesi

Pages
139–144
DOI
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AI Summary & Key Takeaways

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⚡ TL;DR(Too Long; Didn't Read)

Conclusion: It can be suggested that, tissue cysts and neuropathological changes in chronically infected mice brains have direct concern with behavioral manipulation which results from low anxiety levels.

📌 3 Key Takeaways

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Objective & Hypothesis:O b jec ti ve: In this study, it is aimed to constitute a chronic toxoplasmosis model using toxoplasma gondii (T. gondii) ME49 strain that is supposed to produce tissue cysts, to compare healthy and infected mice in terms of behavioral changes.
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Key Findings & Data:Met hod: Before experimental application, out of a total of twenty-one 2-month-old Swiss albino mice, T. gondii antibody-free, 14 were infected by intraperitoneal (IP) (n=8) or oral (n=6) inoculation of 2x102 Toxoplasma gondii ME49 oocysts.
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Conclusion & Impact:Conclusion: It can be suggested that, tissue cysts and neuropathological changes in chronically infected mice brains have direct concern with behavioral manipulation which results from low anxiety levels.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:İmmunoenzim teknikleri · Fare · Kistler

Abstract

O b jec ti ve: In this study, it is aimed to constitute a chronic toxoplasmosis model using toxoplasma gondii (T. gondii) ME49 strain that is supposed to produce tissue cysts, to compare healthy and infected mice in terms of behavioral changes. In addition, the relationship between behavioral changes and brain lesions was questioned. Met hod: Before experimental application, out of a total of twenty-one 2-month-old Swiss albino mice, T. gondii antibody-free, 14 were infected by intraperitoneal (IP) (n=8) or oral (n=6) inoculation of 2x102 Toxoplasma gondii ME49 oocysts. Four months later, fear- and anxiety-related behavioral changes in infected and healthy control groups were comparatively evaluated with plus-maze test. At the end of the experiment (45 day after inoculation), euthanasia was carried out on all mice and their brains were examined histopathologically and immunohistochemically for the presence of T.gondii tissue cysts. Re sults: Infected mice had low levels of anxiety, they have entered the open arms more frequently and have spent more time in the open arms of the maze compared to controls. Pathologically, in the infected group, high rates of gliosis, perivascular cell infiltration, meningitis, and neuron necrosis were observed especially in the parietal and temporal lobes, cornu ammonis, amygdala, and thalamus compared to the other parts of the brain. A higher number of tissue cyst formations were positively correlated with the lesion severity in these parts of the brain. Conclusion: It can be suggested that, tissue cysts and neuropathological changes in chronically infected mice brains have direct concern with behavioral manipulation which results from low anxiety levels.

Özet

Amaç: Bu çalışmada; kist oluşturan T. gondii ME 49 suşu ile enfekte farelerde oluşan anksiyete ile ilişkili davranış değişiklikleri ve beyin lezyonlarıyla ilişkisinin araştırılması amaçlanmıştır. Yön­tem: Uygulama öncesi serumlarında anti-T. gondii antikorlarının olmadığı gösterilen 2 aylık 21 adet erkek Swiss albino fareden deney grubundaki 14’üne; intraperitoneal (IP) (n=8) ve oral (n=6) yollarla 2x102 Toxoplasma gondii ME49 ookisti verildikten 4 hafta sonra, anksiyete veya korku ile ilişkili davranışları T. gondii ile enfekte fareler ile kontrol grubu sağlıklı farelerde karşılaştırmalı olarak değerlendirildi. Deney bitiminde (inokulasyon sonrası 45’inci gün) farelere ötenazi yapılarak, beyinleri histopatolojik olarak ve T. gondii doku kisti antijeni yönünden immunoperoksidaz test ile incelendi. Bul­gu­lar: T. gondii ile enfekte farelerin daha düşük düzeyde anksiyeteye sahip olduklarını, enfekte olmayan kontrol grubundaki farelere göre daha yüksek oran ve süreyle açık kolu tercih ettiklerini ortaya koydu. Patolojik olarak; enfekte grupta özellikle parietal ve temporal loblar, kornu ammonis, amigdala, talamus ve çevresinde, beynin diğer bölümlerine oranla daha yüksek derecede gliozis, perivasküler hücre infiltrasyonu, meningitis ve nöron nekrozları gözlendi. Beyinde T. gondii doku kisti yerleşimi de anılan lezyon şiddeti ile doğru orantılı olarak diğer alanlara oranla daha yüksek sayıdaydı. So­nuç: Kronik toksoplazmozlu farelerin beyinlerinde şekillenen T. gondii doku kistleri ve nöropatolojik değişikliklerin doğrudan anksiyetenin azaltılmasına yönelik davranış manipülasyonu ile ilişkili olduğu öne sürülebilir.

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Cite This Article

KOÇAK, O. M., ATMACA, H. T., TERZİ, O. S., BÜYÜKKAYAER, S., REZAKİ, H. Ö., UZUNALİOGLU, T., CAĞDAŞ, G. D., BAL, E., KUL, O. (2012). Experimental chronic toxoplasmosis model in mice: Brain lesions and related behavioral changes. Nöropsikiyatri Arşivi, Cilt: 49 - Sayı: 2, 139–144. https://ajindex.com/articles/292555

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