Browsing by Subject "Exosomes"

Now showing 1 - 9 of 9
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    Advances in understanding mechanisms of long-term sperm storage-the soft-shelled turtle model
    (Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2020) Chen, Hong; Liu, Tengfei; Holt, William V.; Yang, Ping; Zhang, Linli; Zhang, Li; Han, Xiangkun; Bian, Xunguang; Chen, Qiusheng
    Long-term sperm storage is a special reproductive strategy, which can extend the time window between mating and fertilization in some animal species. Spermatozoa of the soft-shelled turtle, Pelodiscus sinensis, can be stored in the epididymis and oviduct for at least six months and one year, respectively. How spermatozoa can be stored in vivo for such a prolonged period is yet to be explained. We analyze the mechanisms that contribute to long-term sperm storage in P. sinensis, and compare them with other species from three different perspectives: the spermatozoon itself, the storage microenvironment and the interaction between the spermatozoon and microenvironment. Characteristics of soft-shelled turtle spermatozoa itself, such as the huge cytoplasmic droplet with its content of several large lipid droplets (LDs) and onion-like mitochondira, facilitate long-term sperm storage. The microenvironment of reproductive tract, involving in the secretions, structural barriers, exosomes, androgen receptors, Toll-like receptors and survival factor Bcl-2, are important for the maintenance of spermatozoa long-term storage. Sperm heads are always embedded among the oviductal cilia and even intercalate into the apical hollowness of the ciliated cells, indicating that the ciliated cells support the stored spermatozoa. RNA seq is firstly used to detect the molecular mechanism of sperm storage, which shows that autophagy, apoptosis and immune take part in the long-term sperm storage in this species
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    Alcohol-related diseases and liver metastasis: role of cell-free network communication
    (Baishideng Publishing Group, 2022-08-14) Muro, Manuel; Collados Ros, Aurelia; Legaz Pérez, Isabel; Ciencias Sociosanitarias
    Alcohol intake is a risk factor for cancer development and metastatic disease progression. Extracellular vesicle (EV)-mediated interorgan communication is assumed to be significant in boosting tumorigenic pathways and disease progression. Recent research indicates that exosomes have a variety of roles in the development of cancer during pathophysiological conditions. The involvement of EV signaling during cancer progression in the alcohol environment is unknown. Therefore, understanding communication networks and the role of EVs as biomarkers can contribute significantly to developing strategies to address the serious public health problems associated with alcohol consumption and cancer.
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    Exosomes derived from endothelial progenitor cells ameliorate glyoxylate deprivation (OGD)-induced neuronal apoptosis by delivering miR-221-3p
    (Universidad de Murcia. Departamento de Biología Celular e Histología, 2023) Pan, Jie; Wu, Tingting; Chen, Bo; Wu, Huadong
    This study evaluated the potential of endothelial progenitor cell (EPC)-derived exosomes as a therapeutic factor for neuronal apoptosis. Mouse EPCs were cultured in vitro, and exosomes were isolated and identified using transmission electron microscopy (TEM), particle size analysis and by determining the protein expressions of exosome markers (CD9, CD63 and Alix). The apoptotic rate of OGD-treated neurons was detected by Flow cytometry assay. The mRNA and protein expression levels were detected by RT-PCR and Western blot assay, respectively. Luciferase reporter assays determined the interaction between miR-221-3p and Bcl2l11. The results showed that most exosomes are 80-120 nm in diameter. Western blot assay showed that CD9, CD63 and Alix were enriched in exosomes. EPCderived exosomes ameliorated OGD-induced neuronal apoptosis. Mechanistically, miR-221-3p from EPCderived exosomes decreased the expression of bcl2l11 in OGD-induced neuronal apoptosis. Moreover, exosomes from miR-221-3p mimics transfected EPCs reduced OGD-induced neuronal apoptosis. In conclusion, miR221-3p in EPC derived exosomes ameliorates OGDinduced neuronal apoptosis, which establish its potential as a new therapeutic method for patients with cerebrovascular diseases.
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    Extracellular vesicle-mediated modulation of angiogenesis
    (Universidad de Murcia. Departamento de Biología Celular e Histología, 2016) Gai, Chiara; Carpanetto, Andrea; Deregibus, Maria Chiara; Camussi, Giovanni
    Angiogenesis is a tightly regulated process where a number of different players are involved. Recently, a role for membrane vesicles actively released from cells has been proposed. Virtually all cell types may release non-apoptotic membrane vesicles in the nano-size range containing critical components of the cell of origin. The two main categories of these vesicles include exosomes and microvesicles that differ for biogenesis but, sharing several features and mechanisms of action, have been collectively named extracellular vesicles (EV). EV are able to transfer from one cell to another bioactive lipids, proteins and nucleic acids that may induce changes in the phenotype and functions of the recipient cells. This new mechanism of cell to cell communication has been involved in modulation of the angiogenic process. Tumor cells, inflammatory cells and stem/progenitor cells were shown to release EV with angiogenic properties, suggesting that they may act on vascular remodeling in different physiological and pathological conditions. In this review we discuss the evidence for the role and the mechanisms of action of EV in vascular homeostasis and in the angiogenic processes occurring in tumors, inflammation and tissue regeneration.
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    Extracellular vesicles derived from different brain tissue cells: A potential therapeutic measure for hypoxic-ischemic brain injury in immature brains
    (Universidad de Murcia, Departamento de Histología e Histopatología, 2025) Guan Yitong; Yang Lijun; Cui Hong; Biología Celular e Histología
    Neonatal hypoxic-ischemic encephalopathy/ neonatal hypoxic-ischemic brain damage and neonatal acute ischemic stroke are common causes of hypoxic-ischemic brain injury (HIBI) in the neonatal period, which may lead to permanent neurological sequelae. It is difficult to distinguish the two in the early stage. As a timely brain protection measure, hypothermia is still the standard treatment, but its efficacy in the treatment of immature brain injury is still controversial. The underlying pathophysiological mechanisms and effective treatment strategies of neonatal HIBI have been an active area of research. Extracellular vesicles (EVs), a class of nanoscale membranous structures, play a critical role in intercellular communication by facilitating the transfer of bioactive molecules or engaging in receptor-mediated interactions. Recent studies have demonstrated that various cell types within brain tissue, including neurons, astrocytes, microglia, endothelial cells, and stem cells, secrete substantial amounts of EVs. These vesicles carry diverse cargo, such as microRNAs, DNA, and proteins, which exert regulatory effects on recipient cells within the brain, thereby mediating neuroprotective effects. These effects include enhancing synaptic plasticity, modulating neuroinflammation, promoting angiogenesis, and regulating cellular autophagy, collectively contributing to neuroprotection. This review aims to summarize the functional characteristics of EVs derived from different cell types within the brain and to highlight recent advancements in this field. By providing insights into the role of EVs in HIBI, it seeks to provide novel insights and references for understanding the pathogenesis of neonatal HIBI and exploring innovative therapeutic approaches
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    Horse adipose-derived mesenchymal stromal cells constitutively produce membrane vesicles: a morphological study
    (F. Hernández y Juan F. Madrid. Universidad de Murcia: Departamento de Biología Celular e Histología, 2015) Pascucci, L.; Dall’Aglio, C.; Bazzucchi, C.; Mercati, F.; Mancini, M.G.; Pessina, A.; Alessandri, G.; Giammarioli, M.; Dante, S.; Brunati, G.; Ceccarelli, P.
    Mesenchymal stromal cells (MSCs) are multipotent somatic cells that can differentiate into a variety of mature cell types. Over recent years, their biological in vitro and in vivo properties have elicited great expectations in the field of regenerative medicine, immunotherapy and tumour treatment. An increasing number of experimental observations suggest that their biological effects are probably related to a paracrine mechanism via the release of trophic factors and cytokines as well as through the production of membrane vesicles (MVs). These are nanometric membrane-bound structures, comprising shedding vesicles (SV) and exosomes (Ex), that enclose and transfer signalling molecules to target cells. We hypothesized that MVs may be implicated in the biological effects of MSCs from horse adipose tissue (EAdMSCs), a type of MSC that has been extensively studied in recent years for its remarkable efficacy in tissue regeneration. By means of electron microscopy, we ascertained, for the first time, that equine adipose-derived MSCs constitutively produce MVs (E-AdMSCs). The analysis of MVs separated by ultracentrifugation allowed us to describe their general morphological features. Through the examination of cell monolayers by TEM, additionally, we distinguished the different pathways of SV and Ex formation, demonstrating that both fractions are produced by E-AdMSC. The accurate description of MV heterogeneous morphological characteristics led us to emphasize the possible implications of the relationship between different morphologies versus different functions. The data presented in this paper has an additional value, as they can be noteworthy for horses as well as for other mammalian species, including humans.
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    Role of acupuncture in improving the outcome of sepsis-induced lung injury
    (Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2025) Li, Peng; Li, Fangfang; Chen, Si; Ma, Qiulei; Wang, Jie; Ma, Bingquan; Xu, Jin
    Objective. The purpose of this study was to investigate the effect of serum exosomes of mice after acupuncture (acu-exo) on acute lung injury (ALI) in sepsis in vitro and in vivo. Methods. Serum exosomes (acu-exo) of normal mice were prepared after acupuncture. Lipopolysaccharide (LPS) was used to establish the model of ALI in vivo and in vitro. Immunohistochemistry, western blot, and immunofluorescence were used to evaluate the mechanism of acu-exo on ALI. P2X7 knockout mice and P2X7 siRNA were used to verify the mechanism. Results. Compared with normal mice, serum exosomes were significantly increased in normal mice after acupuncture. The results showed that P2X7 was increased in the lung of septic mice as compared with the WT group. It was also found that the increase in NLRP3 and NF-κB was accompanied by the activation of P2X7. Increased P2X7 led to activation of the P2X7 receptor causing mitochondrial dysfunctions in lung tissue of septic mice. Knockout of P2X7 or silenced P2X7 markedly decreased NLRP3 and NF-κB and led to mitochondrial function recovery in lung tissue of sepsis. At the same time, acu-exo significantly restored the above changes in the lung tissue of septic mice. Conclusions. Inhibition of P2X7 led to mito-chondrial function recovery of lung tissue by inhibiting NLRP3 and NF-κB. At the same time, acu-exo could improve ALI by decreasing NLRP3 and NF-κB activation
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    The emerging role of exosomes in survivin secretion
    (F. Hernández y Juan F. Madrid. Universidad de Murcia: Departamento de Biología Celular e Histología, 2015) Khan, Salma; Ferguson Bennit, Heather; Wall, Nathan R.
    The tumor microenvironment plays an integral part in the biology of cancer, participating in tumor initiation, progression, and response to therapy. Factors released by tumor cells themselves contribute in creating an environment mostly favorable but sometimes detrimental to the tumor. Survivin, one of the key members of the inhibitor of apoptosis (IAP) family of proteins, has been shown in the cytoplasm, mitochondria, nucleus, and most recently in the extracellular space, transported via small membrane bound vesicles called exosomes. Exosomes are secreted from hematopoietic, non-hematopoietic, tumor, and nontumor cells, shuttling essential molecules such as proteins, RNAs, and microRNAs, all believed to be important for cell-cell and cell-extracellular communication. In this review, we discuss exosomal Survivin and its role in modifying the tumor microenvironment.
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    Updating research on extracellular vesicles of the male reproductive tract in farm animals: a systematic review
    (MDPI, 2024-10-31) Martínez Díaz, Pablo; Parra, Ana; Montesdeoca, Marina; Barranco Cascales, Isabel; Roca Aleu, Jorge; Medicina y Cirugía Animal
    This systematic review examined research studies on extracellular vesicles (EVs) of the male reproductive tract in livestock species to summarize the research topics and methodologies used, key findings, and future directions. PubMed and Scopus were searched for time ranges up to 1 September 2024, and 1383 articles were identified. The application of screening and eligibility criteria resulted in the selection of 79 articles focusing on male reproductive EVs in livestock. Porcine and bovine male reproductive EVs were the most studied. A variety of EV isolation techniques were used, with ultracentrifugation being the most common. Characterization of male reproductive EVs in livestock was a weak point, with only 24.05% of the articles characterizing EVs according to MISEV guidelines. Inadequate characterization of EVs compromises the reliability of results. The results of 19 articles that provided a good characterization of EVs showed that male reproductive EVs from livestock species are phenotypically and compositionally heterogeneous. These papers also showed that these EVs would be involved in the regulation of sperm functionality. Research on male reproductive EVs in livestock species remains scarce, and further research is needed, which should include appropriate characterization of EVs and aim to find efficient methods to isolate them and assess their involvement in the functionality of spermatozoa and the cells of the female genital tract.