MicroRNA - Online First
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Microrna Expression in Aurelia aurita Metamorphosis
Available online: 28 October 2025More LessIntroductionIn animal taxa and jellyfish, the same genome encodes for the different phenotypes that characterize life stages that follow each other during ontogeny. This situation underscores the existence of profound regulation of genomic information at the epigenetic level. MicroRNAs are fundamental epigenetic regulators. The aim of this study is to evaluate the role of microRNA regulation during jellyfish metamorphosis and to explore the existence of evolutionarily conserved microRNAs.
MethodsSpecimens belonging to the 4-metamorphosis stages of A. aurita (polyps, ephyra, young, and adult jellyfish) were bred and collected. The expression of 2,549 miRNAs for each stage was tested using microarray technology. The comparison of microRNA expression for each phase was performed using line plot analysis and Principal Component Analysis of variance (PCA), while the identification of microRNA clusters was performed via volcano plot analysis.
ResultsA remarkable number of A. aurita miRNAs specifically hybridize with a human miRNA library. Each metamorphosis stage is characterized by a different level of expression of miRNAs: 1) Polyp vs. Ephyra stage: 128 upregulated, 2 downregulated; 2) Ephyra vs. Young stage: 2 upregulated, 135 downregulated; 3) Young vs. Adult stage: 69 upregulated, 6 downregulated. Specific functions inferred from known activities of corresponding miRNAs in higher animals (PubMed database) appear to be coherent with the correlated experimental model.
DiscussionPresent results reveal that microRNAs with human homologs undergo specific expression changes throughout Aurelia aurita metamorphosis. This observation reinforces the hypothesis of a shared evolutionary origin of certain miRNA families between Cnidaria and Bilateria. The dynamic and stage-specific regulation pattern observed suggests that miRNAs play a key role in orchestrating the complex transitions involved in jellyfish development. These findings point to a broader conservation of epigenetic mechanisms, such as miRNA-mediated gene silencing, which may have emerged early in metazoan evolution and contributed to the regulation of cell differentiation and phenotype modulation.
ConclusionThe present study highlights the importance of Aurelia aurita as a model for investigating miRNA-driven epigenetic regulation in non-bilaterian animals. The identification of human-homologous miRNAs provides novel insights into the evolutionary stability of the epigenetic machinery and suggests conserved regulatory functions across distant taxa. Although limited by the use of a human-based microarray platform, the data presented here lay a solid foundation for future studies employing sequencing and functional assays to further explore the role of miRNAs in cnidarian development and evolution.
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Unlocking the Potential of Exosomes: Transforming Wound Healing and Therapeutic Potential
Authors: Shahjad, Nishat Fatma, Zeeshan Ali, Arun Kumar, Mohd Moonis and Phool ChandraAvailable online: 16 October 2025More LessDifficulties in wound healing pose a considerable clinical problem and are a significant source of morbidity in the general population. Systemic disorders such as diabetes and venous insufficiency often result in chronic wounds and an impaired healing process. The healthcare cost of treating chronic wounds in the U.S. already exceeds 20 billion dollars per year and is expected to rise with an aging population and increasing incidence of diabetes. Recently, research and review articles have been used to understand the normal healing process and identify the reasons why certain wounds fail to heal, which should enable the development of more effective therapeutic interventions. Animal models have provided valuable information; however, the healing process differs between humans and animals, and data obtained from in vitro studies can be challenging to extrapolate to a clinical context. In conclusion, this study aims to summarize the current understanding of inflammation, epithelialization, and tissue repair processes, mainly through the use of data from in vitro and in vivo studies. Inflammation, re-epithelialization, granulation tissue development, and collagen remodeling are the fundamental steps in the healing process. As a result, any deviation from the normal sequence and time course of events may result in abnormal healing. Wound healing occurs to repair damaged, devitalized, or missing cells and tissues. In human beings, the result is the reestablishment of structural and functional integrity. This is a vital process that all living organisms undergo at some stage in their lives.
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Equine MicroRNAs: Performance, Reproduction, and Disease
Available online: 16 June 2025More LessMicroRNAs (miRNAs) are molecules that regulate gene expression by targeting the 3′ untranslated region (UTR) of mRNAs. They are essential in numerous biological processes like growth, metabolism, and muscle development. miRNA research has become crucial in livestock breeding, offering solutions for improving animal health and productivity. This review focuses on miRNAs' roles in equine performance, reproduction, and disease, highlighting key findings and future applications in these areas. It discusses the use of circulating miRNAs (ci-miRNA) as biomarkers for athletic performance, particularly in endurance sports, by monitoring responses to exercise-induced stress and recovery. It also examines miRNAs involved in reproductive health, such as those influencing endometritis, oocyte maturation, and embryo development. In terms of disease, miRNAs are highlighted as potential biomarkers for osteoarthritis and sarcoids, offering insights into early diagnosis and treatment. Overall, the review emphasizes the promise of miRNAs in improving equine care through personalized diagnostics and therapeutic approaches.
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Exploring the Role of Non-Coding RNAs in the Gut and Skin Microbiome: Implications for Colorectal Cancer and Healthy Longevity
Available online: 08 April 2025More LessIn the last forty years, cancer mortality rates have risen by more than 40%, with colorectal cancer (CRC) ranking as the third most common kind worldwide, significantly affected by dietary factors. Restricted access to sophisticated medical treatment and insufficient comprehension of colorectal cancer's biology contribute to its elevated occurrence. Researchers have recognized dysbiosis of the gut microbiome as a critical contributor to the development of colorectal cancer, as it influences the expression of non-coding RNAs (ncRNAs) and subsequent molecular pathways essential for tumor proliferation. Moreover, interactions between gut and skin microbiota can impact systemic health and ncRNA regulation, influencing CRC advancement. This study shows how important the gut-skin microbiome axis is in developing colorectal cancer. It suggests that targeting this axis may lead to new treatments, such as changing the microbiome through probiotics, prebiotics, or fecal microbiota transplantation. Nonetheless, we must address obstacles such as population heterogeneity and intricate microbiome-host interactions to facilitate the transition of these medicines into clinical practice. This study seeks to elucidate the roles of dietary treatments, microbiomes, and ncRNAs in the etiology and prevention of colorectal cancer (CRC).
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Role of Exosomal Non-Coding RNAs In Vivo and In Vitro Studies in Colorectal Cancer
Authors: Mohamed Y. Zaky and Hadeer M. HamdallaAvailable online: 18 March 2025More LessColorectal Cancer (CRC) is the third most lethal cancer worldwide. Complex intercellular communication within the tumor microenvironment influences cancer progression, therapeutic resistance, with Exosomes (Exos) and Circulating Extracellular Vesicles (EVs) playing a critical role in this communication. Exosomes can impact recipient cells by carrying various biomolecules, promoting changes that support cancer progression. This review focuses specifically on exosome-derived noncoding RNAs (ncRNAs) in CRC, including microRNAs (miRNAs]), circular RNAs (circRNAs), and long noncoding RNAs (lncRNAs), as significant regulators of cancer biology. The roles of these exosomal ncRNAs in CRC are central to tumor progression, metastasis, and treatment resistance. This review delves into specific molecular mechanisms, such as exosomal lncRNA H19, which enhances CRC chemoresistance by activating the β-catenin pathway, and exo-miR-21, which is implicated in 5-FU chemoresistance. We also highlight emerging evidence on exosomal circRNAs like circ_0006174, linked to doxorubicin resistance through miR-1205/CCND2 axis modulation. These exo-ncRNAs have shown promise as biomarkers and potential therapeutic targets, with studies indicating their diagnostic and prognostic capabilities in CRC patient cohorts. By examining recent in vivo and in vitro studies, we offer a comprehensive understanding of exosomal ncRNAs' roles in CRC pathogenesis and potential applications in clinical trials.
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The Role of Noncoding RNAs in the Prognosis and Diagnosis of Colorectal Cancer: An Emerging Biomarker
Authors: O. Surekha Vani, Kavitha R Thangaraj, Varshaa Ravichandran and Solomon F. D PaulAvailable online: 26 November 2024More LessColorectal cancer has become the leading cause of death worldwide, and it is the second most common cancer in women and the third most common cancer in men. Accumulating evidence suggests that genetic and epigenetic factors play a key role in the development of colorectal cancer. Cancer Stem Cells (CSC) play an important role in the suppression or development of cancer in various conditions. In recent years, non-coding RNAs (ncRNA) have been the focus, and the association of CSC and non-coding RNA has played a crucial role in the development of human cancers. These non-coding RNAs are known to be expressed in many cancers. Studies have suggested that ncRNAs are dysregulated in colorectal cancer cells, and different factors, like Wnt and Notch, are involved in this dysregulation. ncRNAs play a significant role in cancer initiation, migration, and resistance to therapies. Moreover, long noncoding RNAs are known to regulate tumor suppressor genes or oncogenes. Targeting different ncRNAs like miRNA, circular RNA, long noncoding RNAs, and small interfering RNA may provide efficient, targeted therapeutic strategies for colon cancer treatment. This review aims to briefly discuss the latest findings on the role of noncoding RNAs in the prognosis and diagnosis of colon cancer.
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