The Effect of Thymoquinone on Experimental Model of Allergic Conjunctivitis

Year 2020, Volume: 6 Issue: 1, 17 - 22, 12.01.2020

Tolga Kocatürk Ayşe İpek Akyüz Ünsal , Ceren Günel , Buket Demirci , İbrahim Meteoğlu Harun Çakmak , İmran Kurt Ömürlü

https://doi.org/10.30934/kusbed.596688

Cited By: 1

Abstract

Objective: Treatment
of allergic conjunctivitis is challenging and new treatment modalities are
required. In this study; the effect of Thymoquinone (TK), a natural derivative
of Nigella Sativa with its anti-allergic and anti-inflammatory properties, was
investigated on an experimental rat model of allergic conjunctivitis (AK). 

Methods: Forty-eight
female Wistar Albino rats aging between 4-6 months were included in this study.
Rats were divided into 6 groups as following: control, AK, AK + Dexamethasone,
10 mg/kg TK, AK + 3 mg/kg TK and AK + 10 mg/kg TK. To induce an AK rat model,
Ovalbumin (0.3 mg) and Al(OH)₃ (30 mg/ml) in 1 ml of %0.9 NaCl were
given 7 times intraperitoneally (i.p.) to each rat every other day. Ovalbumin
drops (2%) were installed everyday between 15^th-21^th days
directly on conjunctiva. TK was applied i.p. with above mentioned doses. Tissue
Mast Cell Counts (MCC) and histopathological - immunohistochemical staining
results were statistically evaluated.

Results:
Systemic administration of Thymoquinone
alone did not demonstrate any detrimental effect on eye tissues. MCC of
Ovallbumin sensitized AK group was significantly higher than the control cases
(p<0.001). Similar to dexamethasone treated group (p<0.001),
MCC of TK treated group was lower than AK groups’, but the difference was not
statistically significant. As a common finding in all treatment groups weak
focal TGF-β staining and negative TNF-α staining have been determined.

Conclusion: Administration of Ovalbumin using
aforementioned way creates a proper AK
model. TK is a safe non-allergic herbal product and may have a
supplementary role in AK treatment by its anti-inflammatory effect but
unfortunately, it has not reached remarkable anti-allergic effect.

Keywords

Allergic Conjunctivitis model, Nigella Sativa, Thymoquinone

Deneysel Alerjik Konjonktivit Modelinde Çörek Otu Bileşenlerinden Timokinon'un Etkisi

Abstract

Amaç: Alerjik konjonktivit
tedavisi güç bir hastalıktır; yeni tedavi seçeneklerine ihtiyaç vardır. Bu
çalışmada anti-inflamatuar ve anti-alerjik özellikleri olan ve çörek otundan
(Nigella Sativa) elde edilen timokinonun (TK) sıçan alerjik konjonktivit (AK)
modeli üzerindeki etkisinin histolojik yöntemlerle araştırılması amaçlanmıştır.

Yöntem: Çalışmaya 48 adet 4-6 aylık yetişkin Wistar Albino
dişi sıçan dahil edildi. Sıçanlar; kontrol, AK, AK+Deksametazon, 10 mg/kg TK,
AK+3 mg/kg TK ve AK+10 mg/kg TK şeklinde rastgele 6 gruba ayrıldı. AK
geliştirmek için, 30 mg/ml adjuvan Al(OH)₃  ve 0,3 mg
Ovalbumin, serum fizyolojik içinde her sıçana 1 mL intraperitoneal (i.p.)
olarak gün aşırı 7 kez uygulandı. Ardı sıra 15-21. günlerde doğrudan
konjonktiva üzerine serum fizyolojik içinde %2'lik Ovalbumin 7 kez damlatıldı.
Ait olduğu gruba göre TK ilgili dozlarda i.p. olarak uygulandı. Konjonktiva
dokusu mast hücre sayıları (MHS) ile histopatolojik ve immünohistokimyasal MCT, TGFβ ve TNFα boyama sonuçları istatistiksel
olarak değerlendirildi.

Bulgular: Timokinonun tek başına sistemik uygulanması
konjonktiva histolojisinde değişikliğe neden olmadı. Ovalbüminle duyarlı hale
getirilen AK grubu kontrol grubuyla karşılaştırıldığında, konjonktiva
epitelindeki MHS istatistiksel olarak anlamlı artış gösterdi (p<0,001).
Deksametazon tedavi grubunda (p<0,001) olduğu gibi; TK tedavi
gruplarında da MHS, AK grubuna göre daha düşük bulundu ancak bu fark
istatistiksel olarak anlamlı değildi. TGF-β
ile negatif boyanma, TNF-α ile zayıf fokal boyanma tedavi gruplarının ortak
bulgusu olarak saptandı. 

Sonuç: Bu çalışmadaki doz ve sürelerle uygulanan ovalbümin,
deneysel çalışmalar için uygun bir AK modeli oluşturmaktadır. Timokinonun
uygulanan dozlarda yan etki oluşturmadığı ve AK gelişen durumlarda da kısmen
anti-inflamatuar yönü ile tedaviye destek olabileceği, ancak istenen
anti-alerjik etkiyi göstermediği düşünülmektedir.

Keywords

Alerjik konjuncktivit modeli, çörek otu, timokinon

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