Publication: Allantoin ve Büyüme Faktörlerinden Zengin Plazmanın Hasarlı Periferik Sinir Üzerine Etkilerinin Deneysel Olarak İncelenmesi
Abstract
Amaç: Çalışmanın amacı, siyatik sinir hasarı meydana getirilen sıçanlarda lokal allantoin ve büyüme faktörlerinden zengin plazma (PRGF) uygulamasının rejenerasyon sürecine akut etkilerinin değerlendirilmesidir. Aynı zamanda allantoin ve PRGF'nin hasarlı sinir dokusu üzerindeki rejeneratif potansiyellerinin karşılaştırılması ve kombine kullanımlarının meydana getireceği sonuçların incelenmesidir. Materyal ve Metot: Bu çalışma için 28 adet Wistar Albino cinsi dişi sıçan kullanılmıştır. Denekler; Kontrol (n=7), Allantoin (n=7), PRGF (n=7) ve PRGF + Allantoin (n=7) olmak üzere 4 gruba ayrılmıştır. Grupların hepsinde sağ siyatik sinirde ezilme tipi hasar oluşturulmuştur. Kontrol grubuna ilave işlem uygulanmamıştır. Allantoin grubunda hasarlı sinir bölgesine serum fizyolojik içerisinde çözdürülmüş allantoin lokal uygulanırken; PRGF + Allantoin grubunda allantoin, PRGF içerisinde çözdürülmüş jel formda uygulanmıştır. PRGF ve PRGF + Allantoin gruplarında uygulanan PRGF biyomateryali, deneklerin kendi venöz kanlarından elde edilmiştir. Deneyi takip eden 30. günde tüm deneklere fonksiyonel, elektrofizyolojik, stereolojik ve immünohistokimyasal incelemeler yapılmıştır. Bulgular: Ölçümler sonucunda SFİ ve amplitüd değerleri açısından gruplar arasında anlamlı fark görülmezken (p>0.05); latans süreleri tüm tedavi gruplarında Kontrol grubuna kıyasla azalmıştır (p<0.05). Miyelinli akson sayısı, PRGF grubunda istatistiksel olarak anlamlı şekilde en yüksek değeri göstermiştir (p<0.001). Miyelin kılıf kalınlığı, tüm tedavi gruplarında Kontrol grubunun üzerinde görülmüştür (p<0.001). Akson alanı ise Allantoin grubunda, Kontrol değerlerinin altına inerken (p=0,0268); PRGF grubunda, Allantoin ve PRGF + Allantoin gruplarından anlamlı derecede artmıştır (p<0.001). Anti-Ki67 değeri Allantoin grubunda, PRGF ve PRGF + Allantoin gruplarına göre anlamlı biçimde azalmıştır (p<0.05). Anti-Kaspaz-3; PRGF ve PRGF + Allantoin gruplarında, Kontrol ve Allantoin gruplarına göre artmıştır (p<0.05). Anti-S100β, tüm tedavi gruplarında Kontrol grubuna kıyasla artmıştır (p<0.05). Anti-MBP ise; PRGF grubunda, Allantoin ve PRGF + Allantoin gruplarından anlamlı derecede daha yüksek bulunmuştur (p<0.05). Sonuç: PRGF; miyelinli akson sayısını, MBP düzeyini, miyelin kalınlığını, Schwann hücre aktivitesini (S100β) ve akson alanını yükselterek diğer tedavilere göre en güçlü rejeneratif yanıtı oluşturmuştur. Allantoin ise apoptozu (kaspaz-3) baskılamış, proliferasyonu (Ki-67) kısıtlamış ve miyelinizasyonu ılımlı düzeyde iyileştirmiştir. İki ajanın birlikte uygulanması beklenen ek yararı sağlamamıştır.
Aim: This study aims to evaluate the impact of local allantoin and plasma rich in growth factors (PRGF) on the acute nerve regeneration process in a rat model of sciatic nerve injury. The study also seeks to evaluate the regenerative capabilities of allantoin and PRGF on injured nerve tissue, as well as to investigate the outcomes of their combined application. Material and Methods: For this study, 28 female Wistar Albino rats were employed. Control (n=7), allantoin (n=7), PRGF (n=7), and PRGF + Allantoin (n=7), were the four groups into which the subjects were divided. All groups sustained a crush injury to the right sciatic nerve. No additional procedures were performed in group Control. In the Allantoin group, allantoin dissolved in saline was applied locally to the injured nerve region, while in the PRGF + Allantoin group, allantoin dissolved in PRGF was applied in gel form. PRGF was obtained from the animals in the PRGF and PRGF + Allantoin groups. Functional, electrophysiological, and stereological examinations were performed 30 days after the experiment. Results: The results showed no significant differences between groups in terms of SFI and amplitude values (p>0.05); latency times decreased in all treatment groups compared to the Control group (p<0.05). The number of myelinated axons was statistically highest in the PRGF group (p<0.001). Myelin sheath thickness was higher in all treatment groups compared to the Control group (p<0.001). The axon area decreased below Control values in the Allantoin group (p=0.0268); it was significantly higher in the PRGF group compared to the Allantoin and PRGF + Allantoin groups (p<0.001). The anti-Ki67 value was significantly lower in the Allantoin group compared to the PRGF and PRGF + Allantoin groups (p<0.05). Anti-Caspase-3 was higher in the PRGF and PRGF + Allantoin groups than in the Control and Allantoin groups (p<0.05). Anti-S100β was higher in the in all treatment groups than Control group (p<0.05). Anti-MBP was significantly higher in the PRGF group than in the Allantoin and PRGF + Allantoin groups (p<0.05). Conclusion: PRGF produced the strongest regenerative response by increasing the number of myelinated axons, MBP levels, myelin thickness, Schwann cell activity (S100β), and axon area. Allantoin, on the other hand, inhibited apoptosis (caspase-3), reduced proliferation (Ki-67), and moderately improved myelination. The combined use of the two agents did not provide additional benefits.
Aim: This study aims to evaluate the impact of local allantoin and plasma rich in growth factors (PRGF) on the acute nerve regeneration process in a rat model of sciatic nerve injury. The study also seeks to evaluate the regenerative capabilities of allantoin and PRGF on injured nerve tissue, as well as to investigate the outcomes of their combined application. Material and Methods: For this study, 28 female Wistar Albino rats were employed. Control (n=7), allantoin (n=7), PRGF (n=7), and PRGF + Allantoin (n=7), were the four groups into which the subjects were divided. All groups sustained a crush injury to the right sciatic nerve. No additional procedures were performed in group Control. In the Allantoin group, allantoin dissolved in saline was applied locally to the injured nerve region, while in the PRGF + Allantoin group, allantoin dissolved in PRGF was applied in gel form. PRGF was obtained from the animals in the PRGF and PRGF + Allantoin groups. Functional, electrophysiological, and stereological examinations were performed 30 days after the experiment. Results: The results showed no significant differences between groups in terms of SFI and amplitude values (p>0.05); latency times decreased in all treatment groups compared to the Control group (p<0.05). The number of myelinated axons was statistically highest in the PRGF group (p<0.001). Myelin sheath thickness was higher in all treatment groups compared to the Control group (p<0.001). The axon area decreased below Control values in the Allantoin group (p=0.0268); it was significantly higher in the PRGF group compared to the Allantoin and PRGF + Allantoin groups (p<0.001). The anti-Ki67 value was significantly lower in the Allantoin group compared to the PRGF and PRGF + Allantoin groups (p<0.05). Anti-Caspase-3 was higher in the PRGF and PRGF + Allantoin groups than in the Control and Allantoin groups (p<0.05). Anti-S100β was higher in the in all treatment groups than Control group (p<0.05). Anti-MBP was significantly higher in the PRGF group than in the Allantoin and PRGF + Allantoin groups (p<0.05). Conclusion: PRGF produced the strongest regenerative response by increasing the number of myelinated axons, MBP levels, myelin thickness, Schwann cell activity (S100β), and axon area. Allantoin, on the other hand, inhibited apoptosis (caspase-3), reduced proliferation (Ki-67), and moderately improved myelination. The combined use of the two agents did not provide additional benefits.
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