Publication: Sirkadiyen Ritimleri Bozulmuş Farelerde Probiyotik Takviyesinin Sirkadiyen Ritim Genleri ve Serum Zonulin Düzeyleri Üzerine Etkisinin Belirlenmesi
Abstract
Araştırmamızda aydınlık ve karanlık döngüleri her iki haftada bir değiştirilerek sirkadiyen ritimleri bozulmuş farelerde probiyotik takviyesinin; merkezi sirkadiyen ritim gen ekspresyonları ve bir bağırsak bariyer geçirgenliği belirteci olan serum zonulin düzeyi üzerine etkilerinin araştırılması amaçlanmıştır. BALB/c türü her biri 8 fareden oluşan 3 farklı deney hayvanı grubu oluşturulmuştur. Gruplar sırasıyla; Kontrol grubu, Sirkadiyen ritimleri aydınlık/karanlık döngüleri değiştirilerek bozulmuş grup (BSR) ve Sirkadiyen ritimleri aydınlık/karanlık döngüleri değiştirilerek bozulmuş ve çalışmanın son iki ayında probiyotik takviyesi verilmiş (Probiyotik+BSR) gruplardır. Farelerde merkezi sirkadiyen ritim gen ekspresyonları incelenmiş ve ağırlık kazanımı hesaplanmıştır. Biyokimyasal parametreler için ELISA yöntemi kullanılmıştır. Çalışma sonunda sirkadiyen ritimleri bozulmuş gruplar arasında başlangıç ve son ağırlıklar ile ağırlık değişimleri açısından istatistiksel olarak anlamlı farklılık bulunmuştur (p<0,05). BSR ve Probiyotik+BSR gruplarında Zonulin seviyelerinde Kontrol grubuna kıyasla artış saptanmıştır. Fakat bu artış istatistiksel olarak anlamlı değildir (p= 0,503). Merkezi sirkadiyen ritim genleri olan Clock, Bmal1 ve Per2 genlerinin ekspresyonları gruplar arasında ve örnek alım saatleri arasında değişiklik gösterse de sonuçlar istatistiksel olarak anlamlı değildir. Sonuç olarak, sirkadiyen ritimlerin aydınlık/karanlık döngüleri değiştirilerek bozulmasının ağırlık kazanımını artırdığı, serum zonulin düzeylerinde artırıcı bir etkisinin olduğu ve merkezi sirkadiyen ritim genleri üzerine ekspresyon seviyelerinin değişmesine sebep olduğı görülmüştür. Sirkadiyen ritimleri değiştirilmiş farelerde probiyotik takviyesinin ağırlık kazanımını probiyotik almayan gruba göre azalttığı, serum zonulin seviyesi üzerine ve Per2 geninin ekspresyon seviyesinde olumlu etki gösterdiği sonucuna varılmıştır.
In our study, it was aimed to investigate the effects of probiotic supplementation on central circadian rhythm gene expressions and serum zonulin levels, a marker of intestinal barrier permeability, in mice with impaired circadian rhythms by changing the light and dark cycles every two weeks. We formed three groups of experimental animals in BALB/c genus, each consisting of 8 mice. Kontrol was control group, BSR was the group whose circadian rhythms were disrupted by changing the light/dark cycles and Probiyotik+BSR was the group whose circadian rhythms were disrupted by changing the light/dark cycles and were given probiotic supplementation at the last two months of the study. Central circadian rhythm gene expressions in mice were examined and weight gain was calculated. ELISA method was used for biochemical markers. At the end of the study, there was a statistically significant difference between the groups in terms of baseline and final weights (p <0,05). The serum zonulin levels of the mice in BSR and Probiyotik+BSR with disrupted circadian rhythms were increased compared to the control group. But, this increase was not statistically significant (p= 0,503). Although the expressions of the central circadian rhythm genes Clock, Bmal1 and Per2 varied between groups and between sampling times, the results were not statistically significant. In conclusion, it was observed that disruption of circadian rhythms by changing the light/dark cycles increased weight gain, had an increasing effect on serum zonulin levels and caused a change in expression levels on central circadian rhythm genes. It was concluded that probiotic supplementation reduced weight gain in mice with disrupted circadian rhythms compared to the group that did not receive probiotics, and had a positive effect on serum zonulin level and expression level of Per2 gene.
In our study, it was aimed to investigate the effects of probiotic supplementation on central circadian rhythm gene expressions and serum zonulin levels, a marker of intestinal barrier permeability, in mice with impaired circadian rhythms by changing the light and dark cycles every two weeks. We formed three groups of experimental animals in BALB/c genus, each consisting of 8 mice. Kontrol was control group, BSR was the group whose circadian rhythms were disrupted by changing the light/dark cycles and Probiyotik+BSR was the group whose circadian rhythms were disrupted by changing the light/dark cycles and were given probiotic supplementation at the last two months of the study. Central circadian rhythm gene expressions in mice were examined and weight gain was calculated. ELISA method was used for biochemical markers. At the end of the study, there was a statistically significant difference between the groups in terms of baseline and final weights (p <0,05). The serum zonulin levels of the mice in BSR and Probiyotik+BSR with disrupted circadian rhythms were increased compared to the control group. But, this increase was not statistically significant (p= 0,503). Although the expressions of the central circadian rhythm genes Clock, Bmal1 and Per2 varied between groups and between sampling times, the results were not statistically significant. In conclusion, it was observed that disruption of circadian rhythms by changing the light/dark cycles increased weight gain, had an increasing effect on serum zonulin levels and caused a change in expression levels on central circadian rhythm genes. It was concluded that probiotic supplementation reduced weight gain in mice with disrupted circadian rhythms compared to the group that did not receive probiotics, and had a positive effect on serum zonulin level and expression level of Per2 gene.
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