Please use this identifier to cite or link to this item: http://hdl.handle.net/10201/29789

Title: Down-regulation of lysyl oxydase-like in aging and venous insufficiency
Issue Date: 2008
Publisher: Murcia : F. Hernández
ISSN: 0213-3911
Related subjects: 61 - Medicina
Keywords: Varicose vein
Tropoelastin
Abstract: Background: Elastin expression is higher in tissues where elastic fibres are essential for the correct maintenance of function such as blood vessels. Elastin expression usually diminishes with age, however, it may be re-expressed in response to injury or repair processes. Some authors attribute the characteristic loss of elasticity of the varicose vein to a drop in the population of smooth muscle cells in the media layer. A reduction in elastin has been observed in chronic venous insufficiency, but little is known about some of the factors involved in elastin synthesis such as lysyl oxidases. The aim of this study was to examine the in vivo expression of the elastin precursor, tropoelastin (TE), and lysyl oxidase-like 1 (LOXL1), a cross-linking enzyme responsible for elastin polymer deposition. The effects of age on these expression patterns were also evaluated. Methods: Saphenous vein segments were obtained during surgery from organ donors (controls, n=20) and subjects with venous insufficiency (varicose veins, n=20). Both these groups were subdivided according to subject age into <50 years (n=10) and ³ 50 years (n=10). Control and varicose vein tissue specimens were immunolabelled using anti-tropoelastin and antiLOXL1 antibodies and also subjected to Western blot analysis. Results: Our results indicate that the levels of these markers of elastin synthesis (LOXL/tropoelastin) in the vein wall diminish in a significant way (p<0.05) with the age factor. Excluding the age factor, LOXL1 was significantly decreased in the varicose condition (p<0.05). In the younger pathological population they showed an inverse relationship (LOXL decreased, tropoelastin increased). Conclusions: The already established reduction in elastin in the varicose condition may be related, at least in part, to the decreased LOXL1 levels observed here. These events could reduce spontaneous reticulation of elastin and the partial loss of tissue elasticity in this group of patients.
Primary author: Pascual, G.
Mendieta, C.
Mecham, R.P.
Sommer, P.
Bellón, J.M.
Buján, J.
Published in: Histology and histopathology
URI: http://hdl.handle.net/10201/29789
Document type: info:eu-repo/semantics/article
Number of pages / Extensions: 8
Rights: info:eu-repo/semantics/openAccess
Appears in Collections:Vol.23, nº2 (2008)

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