Bağırsak–Beyin–İmmün Ekseni Üzerine Laboratuvar Hayvanları Araştırmalarında Deneysel Titizlik ve Tekrarlanabilirliğin Artırılması

Öz

Laboratuvar hayvan modelleri, nöroimmün ve sistemik biyolojik süreçlerin araştırılmasında vazgeçilmezdir; ancak deneysel sonuçlar sıklıkla fark edilmeyen biyolojik ve metodolojik değişkenlik tarafından şekillendirilmektedir. Artan kanıtlar, gastrointestinal, dermal ve solunum bariyerleri dâhil olmak üzere çoklu epitel arayüzlerinde görülen eşgüdümlü işlev bozukluklarının, laboratuvar hayvan araştırmalarında deneysel değişkenliğin göz ardı edilen bir belirleyicisi olduğunu göstermektedir. Standartlaştırılmış kemirgen çalışmalarında bu bariyerler arası bağımlılık, sistemik inflamasyona, nöroimmün hazırlanmaya ve tutarsız deneysel sonuçlara katkıda bulunabilir. Bu anlatı derlemesi, laboratuvar hayvan bilimi ve karşılaştırmalı patoloji bulgularını sentezleyerek, bağırsak–beyin–immün (GBI) ekseni araştırmalarında deneysel geçerliliği yorumlamak için birleşik çoklu-bariyerli bir çerçeve önermektedir. Epitel bariyer bozulmasının, metabolik ve mitokondriyal stresin ve doğuştan gelen immün aktivasyonun—özellikle NLRP3 sinyalleşmesini içeren steril inflamatuvar yolların—merkezi sinir sistemi homeostazını ve yaygın olarak ölçülen nöroimmün ve davranışsal çıktıları nasıl etkilediğini inceliyoruz. Epigenetik programlama ve glifatik temizlenme gibi yeni kavramlar, periferik fizyolojik stresin merkezi sonuçlarla bağlantısını kuran bütünleştirici mekanizmalar olarak tartışılmaktadır. Derleme ayrıca çevresel stres faktörlerini, barınma koşullarını, tür- ve soy-spesifik duyarlılıkları ve perimortem doku işleme süreçlerini laboratuvar hayvan çalışmalarında sıkça göz ardı edilen önemli karıştırıcılar olarak vurgulamaktadır. Vahşi ve esaret altındaki türlerden yapılan karşılaştırmalı gözlemler, Tek Sağlık (One Health) perspektifi içinde bariyer kırılganlığının belirteç göstergeleri olarak ele alınmaktadır. Son olarak, nano-temelli dağıtım platformları dâhil metodolojik iyileştirmeler, dozlama tutarlılığını ve mekanistik yorumlanabilirliği geliştirmek için deneysel araçlar olarak tartışılmaktadır. Deneysel değişkenliği laboratuvar hayvan merkezli, çoklu-bariyerli bir bakış açısıyla çerçeveleyerek, bu derleme daha iyi deneysel tasarımı desteklemeyi, tekrarlanabilirliği artırmayı ve translasyonel bütünlüğü güçlendirmeyi, aynı zamanda etik iyileştirme ilkelerini pekiştirmeyi amaçlamaktadır.

Anahtar Kelimeler

• Çoklu bariyer çerçevesi
• Bağırsak–beyin–bağışıklık
• Steril inflamasyon
• Karşılaştırmalı patoloji

Enhancing Experimental Rigor and Reproducibility in Laboratory Animal Research on the gut–brain–immune Axis

Öz

Laboratory animal models are essential for investigating neuroimmune and systemic biological processes; however, experimental outcomes are frequently shaped by unrecognized biological and methodological variability. Increasing evidence indicates that coordinated dysfunction across multiple epithelial interfaces—including gastrointestinal, dermal, and respiratory barriers—represents an underappreciated determinant of experimental variability in laboratory animal research. In standardized rodent studies, such barrier interdependence may contribute to systemic inflammation, neuroimmune priming, and inconsistent experimental outcomes. This narrative review synthesizes evidence from laboratory animal science and comparative pathology to propose a unified multi-barrier framework for interpreting experimental validity in gut–brain–immune (GBI) axis research. We examine how epithelial barrier disruption, metabolic and mitochondrial stress, and innate immune activation—particularly sterile inflammatory pathways involving NLRP3 signaling—interact to influence central nervous system homeostasis and commonly measured neuroimmune and behavioral readouts. Emerging concepts, including epigenetic programming and glymphatic clearance, are discussed as integrative mechanisms linking peripheral physiological stress to central outcomes. The review further highlights environmental stressors, housing conditions, species- and strain-specific susceptibility, and perimortem tissue handling as major yet frequently overlooked confounders in laboratory animal studies. Comparative observations from wild and captive species are incorporated as sentinel indicators of barrier vulnerability within a One Health perspective. Finally, methodological refinements, including nano-enabled delivery platforms, are discussed as experimental tools to improve dosing consistency and mechanistic interpretability. By framing experimental variability through a laboratory animal–centered, multi-barrier perspective, this review aims to support improved experimental design, enhance reproducibility, and strengthen translational integrity while reinforcing principles of ethical refinement.

Anahtar Kelimeler

• Multi-barrier framework
• Gut–brain–immune axis
• Sterile inflammation (NLRP3 inflammasome)
• Comparative pathology

Kaynakça

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