morphology-characterization-anterior-regeneration-diopatra

Morphology Characterization of Anterior Regeneration in <em>Diopatra claparedii</em>

Polychaetes possess the ability to regenerate anterior and posterior segments following injury or self-amputation, offering a tractable system for ...

Universiti Malaysia Terengganu

Alzheimer's disease (AD) represents a major global health challenge, characterised by progressive neurodegeneration that leads to cognitive decline. Inflammation is a key factor in the pathogenesis of AD, affecting both neuroinflammation and systemic inflammation. In AD, neuroinflammation is marked by the activation of microglia and the release of pro-inflammatory cytokines, which exacerbate neuronal damage and cognitive deficits. Systemic inflammation further compromises the blood-brain barrier (BBB), increasing its permeability and permitting the entry of inflammatory molecules and immune cells into the brain, thereby advancing the disease's hallmark features. Recent studies have elucidated the influence of gut microbiota dysbiosis on AD and inflammation. This imbalance is thought to be associated with alterations in the concentrations of short-chain fatty acids (SCFAs) and bile acids, which can modulate neuroinflammation and contribute to AD pathology. Additionally, imbalances in neurotransmitters resulting from gut microbiota dysbiosis can further disrupt brain function and facilitate AD progression. This review provides an overview of the hypothesis that systemic and central nervous system (CNS) inflammation, together with gut-microbiota dysbiosis, may interact to influence the development and progression of AD.

The Interplay of Inflammation and Gut-Microbiota Dysbiosis in Alzheimer's Disease: Mechanisms and Therapeutic Potential.

Circular RNAs (circRNAs), a class of covalently closed, non-coding RNAs, have recently emerged as crucial regulators of gene expression. They exert their roles through microRNA (miRNA) sponging, transcriptional regulation, and interactions with RNA-binding proteins (RBPs). Increasing evidence suggests that circRNAs play important roles in neurodevelopmental disorders, including Down syndrome (DS). DS is a condition caused by trisomy of chromosome 21 and characterised by intellectual disability (ID), neuroinflammation, and increased risk of early-onset Alzheimer's disease (AD). Aberrant circRNA expression in DS may contribute to pathogenesis by disrupting competing endogenous RNA (ceRNA) networks, modulating synaptic plasticity, and influencing key molecular pathways, including EZH2-mediated chromatin remodelling, immune response regulation, and neuronal differentiation. Despite these emerging insights, the role of circRNAs in DS remains largely underexplored compared to their well-recognised functions in cancer and other neurological disorders. Most current studies have focused on transcriptomic analyses, identifying differentially expressed circRNAs and predicting their interactions with miRNAs and mRNAs. However, these findings require further experimental validation to uncover the precise mechanisms through which circRNAs contribute to DS pathophysiology. This review highlights the association of circRNAs with DS, emphasising their dysregulation and mechanistic interactions with miRNAs and mRNAs. It further explores how these circRNA-mediated mechanisms may contribute to intellectual disability and impaired neurodevelopment, based on current evidence.

Article	Year
The Interplay of Inflammation and Gut-Microbiota Dysbiosis in Alzheimer's Disease: Mechanisms and Therapeutic Potential. International journal of molecular sciences\| PubMed ID: 41009474	2025
Biogenesis and function of circular RNAs and their implications in the Down syndrome brain. Frontiers in genetics\| PubMed ID: 41384038	2025

Nurul Nadirah Razali

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