2-Aminoetoksidifenil Borat’ ın Akut Serebral İskemi-Reperfüzyon Hasarı Üzerindeki Etkisi; Deneysel Bir Çalışma

Yıl 2020, , 74 - 81, 16.03.2020

Tuba Demirci , Nuray Bilge Bilge , Özlem Özgül Abuç , Nuh Çağrı Karaavcı

https://doi.org/10.31832/smj.637779

Öz

Amaç: Serebral İ/R hasarında hücre ölümüne neden olan faktörlerin
başında hücre içi kalsiyum konsantrasyonundaki artış gelmektedir. Depo
kontrollü Ca²⁺  girişi (Store
operated Ca²⁺ entry,
SOCE), hücre içine Ca²⁺ girişinden sorumludur ve Orai1, STIM1 ve
STIM2 proteinleri aracılığıyla gerçekleşir. 2-Aminoetoksidifenil Borat (2-APB), hücreye depo kontrollü Ca²⁺
girişini engelleyen kimyasal bir ajandır. Bu çalışmada deneysel olarak sıçanlarda oluşturulan serebral İ/R
modelinde meydana gelen hasarda 2-APB’nin
olası koruyucu etkisi araştırıldı.

Gereç ve Yöntemler: Çalışmada, on sekiz erkek sıçan 3 gruba ayrıldı (n=6). Sham
grubunda cerrahi prosedür
uygulandı ancak İ/R modeli oluşturulmadı. Sİ/R ve Sİ/R-2APB grubundaki sıçanlara
akut serebral İ/R modeli oluşturuldu.
Bir saatl sonra reperfüzyon sağlandı. Sİ/R-2APB grubundaki sıçanlara reperfüzyondan 10 dk önce 2-APB uygulandı. Reperfüzyondan 3
saat sonra sıçanlara ötenazi uygulanarak beyinleri
çıkarıldı.
Sıçan beyin dokularında
meydana gelen değişiklikler histokimyasal yöntemlerle, TUNEL metoduyla ve immünohistokimyasal
olarak değerlendirildi.

Bulgular: Sİ/R grubunda, sham
grubuna kıyasla histolojik yapının
bozulduğu, apopitozisin ve Orai1, STIM1 ve STIM2 proteinlerinin ekspresyonunun arttığı belirlendi. 2-APB  uygulanan grupta ise doku hasarının ve apopitotik hücrelerin azaldığı, Orai1, STIM1 ve STIM2 ifadesinin belirgin şekilde inhibe edildiği ortaya konuldu.

Sonuç: Sonuç olarak,
serebral İ/R hasarlı dokuda 2-APB’nin
hücreye SOCE aracılı Ca²⁺  girişini azaltarak apopitozun ve nöronal
hasarın azatılmasında etkili olabileceği ortaya konuldu.

Anahtar Kelimeler

2-Aminoetoksidifenil borat, Serebral iskemi/reperfüzyon, SOCE

Effect of 2-Aminoethoxydiphenyl Borate on Acute Cerebral Ischemia-Reperfusion Injury; An Experimental Study

Öz

Objective: The store-operated Ca²⁺ entry (SOCE) is
responsible for Ca²⁺ entry into the cell and takes place mediated by the Orai1, STIM1, and
STIM2 proteins. 2-Aminoethoxydiphenyl Borate (2-APB) is a chemical agent that
prevents store-operated Ca²⁺ entry into the cell. In this study, it was investigated the possible
protective effect of 2-APB on the occurred injury in the experimental cerebral
I/R model in rats.

Materials and Methods:
In the study, eighteen male rats were
divided into three groups (n=6). In the Sham group, only surgical procedure was
applied without I/R model. Acute cerebral I/R model was created for rats in the
SI/R and SI/R-2APB groups. Reperfusion was realized one-hour later. Ten-minutes
before reperfusion, 2-APB was administered to the rats in the SI/R-2APB group.
After three hours of reperfusion, the rats were sacrificed and their brains
were removed. The changes that occurred in the brain tissues were investigated
by using histochemical methods, the TUNEL, and immunohistochemical staining.

Results: In the SI/R group, it was determined that the
histological structure was impaired and apoptosis and expression of Orai1,
STIM1, and STIM2 proteins were increased compared to the sham group. In the
2-APB administrated group, it was revealed that the tissue damage and apoptotic
cells were decreased, and Orai1, STIM1, and STIM2 expression were significantly
inhibited.

Conclusion: As a result, it has been demonstrated that 2-APB
may be effective in decreasing apoptosis and neuronal damage by reducing
SOCE-mediated Ca²⁺ influx into the cell in cerebral I/R damaged
tissue.

Anahtar Kelimeler

2-Aminoethoxydiphenyl borate, Cerebral ischemia / reperfusion, SOCE

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