Browsing by Subject "TRPV1"

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    Differential expression and localization of transient receptor potential vanilloid 1 in rabbit and human eyes
    (F. Hernández y Juan F. Madrid. Universidad de Murcia. Departamento de Biología Celular e Histología, 2013) Martínez-García, M. Carmen; Martínez, Tamara; Pañeda, Covadonga; Gallego, Patricia; Jimenez, Ana I.; Merayo, Jesus
    Introduction: The superfamily of transient receptor potential (TRP) cation channels is involved in nociception. Members of this family, such as the vanilloid receptor type 1 (TRPV1) channel, are activated by a wide range of stimuli including heat (>43°C), low pH (<6.5), hypoxia, and hypertonicity. Here we report TRPV1 expression in rabbit and human eyes. Material and methods: We analyzed the expression of TRPV1 mRNA by quantitative reverse transcription polymerase chain reaction (qRT-PCR) and protein by immunohistochemistry in eyes of New Zealand White rabbits and humans. Results: In rabbit and human eyes, TRPV1 protein was present in all layers of the corneal epithelium, but only in the basal layer of the conjunctiva. It was also in the ciliary and lens epithelia of both species as well as in the secretory cells of the rabbit lacrimal gland. The retinal pigment epithelium was positive for this protein in both species. TRPV1 was also present in rabbit Müller cells, where it had a similar pattern of expression to vimentin intermediate filaments. Analysis by qRT-PCR showed that TRPV1 mRNA was found in all of the structures where the protein was present. The highest level was in the lens and the lowest in the retina. Conclusion: TRPV1 is expressed in cells that are particularly active in Ca2+ exchange as well as in cells with significant water transport activity. Because TRPV1 is a Ca2+ channel, it probably functions in the regulation of both water and Ca2+ movements in ocular tissues.
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    Preliminary analysis of the association of TRPV1 to the formation of Marfan syndrome aneurysms
    (Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2019) Soto, María Elena; Soria Castro, Elizabeth; Guarner Lans, Verónica; Martínez Guzmán, Andrés; Morales Marín, Cesar Amilcar; Martínez Zavala, Karla Susana; Pérez Torres, Israel
    Marfan syndrome (MS) is an autosomal dominant disorder of connective tissue that is caused by mutations in the fibrillin-1 (FBN-1) gene that cause degeneration of the artery. It is accompanied by endothelial dysfunction. The potential transient receptor of the vanilloid subfamily 1 (TRPV1) ion channel plays an important role in endothelial vascular functioning. Here we determine the association of the presence TRPV1 in aortic aneurysm with dilation and dissection of the artery in MS patients. Histological sections of aortic aneurysm tissue obtained by the surgical procedure of Bentall and De Bono or David, were processed by immunohistochemistry with antibodies against ICAM, VCAM, iNOS, eNOS, TRPV1 and TNF- α and the immunolabelling area was determined. We also measured the NO 3- /NO 2- ratio in the aortic tissue. C-reactive protein and HDL in plasma were quantified. A significant increase in iNOS, TRPV1, VCAM (p≤0.05), NO 3- /NO 2- ratio (p=0.002) and a significant decrease in eNOS (p=0.04) and HDL in plasma (p=0.02) in the MS vs. the C group were found. Conclusion: TRPV1 is over-expressed in aortic tissue from MS patients and can be associated with increases in iNOS, VCAM and a decrease in eNOS. These changes might contribute to the progression and rupture of the thoracic aneurysm.