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| Elastin | |
|---|---|
| Name | Elastin |
| Uniprot | P15502 |
| Organism | Homo sapiens |
Elastin is an extracellular matrix protein that provides resilience and elastic recoil to many vertebrate tissues. Originally identified in studies of connective tissue and histology in the 19th century, it has become central to research in developmental biology, cardiovascular disease, and tissue engineering. Elastin’s unique capacity to store mechanical energy underlies functional properties of organs such as the aorta, lung, and skin.
Elastin is synthesized as a soluble precursor, tropoelastin, characterized by alternating hydrophobic domains and cross-linking lysine-rich domains, enabling formation of a highly insoluble, elastic polymer. Structural studies using X-ray crystallography, nuclear magnetic resonance, and mass spectrometry have resolved segments of tropoelastin and revealed repetitive motifs including VPGVG-like sequences and desmosine/isodesmosine cross-links. Cross-linking is catalyzed by members of the lysyl oxidase family, which oxidatively deaminate specific lysine residues to form allysine that condense into complex cross-links; these reactions have been studied by groups at institutions such as the University of Cambridge, Stanford University, and the National Institutes of Health. Elastin’s hydrophobic domains confer entropic elasticity analogous to polymer models developed by Paul J. Flory and researchers in macromolecular science.
Tropoelastin synthesis is regulated at transcriptional and translational levels by factors including transforming growth factor beta (TGF-β), retinoic acid, and mechanical stretch signaling pathways involving integrins and the focal adhesion kinase cascade. The human gene encoding tropoelastin, ELN, maps to chromosome 7 and has been characterized through sequencing projects at the Human Genome Project consortium and analyses by the National Center for Biotechnology Information. Alternative splicing generates multiple isoforms; regulatory regions interact with transcription factors such as Sp1 and AP-1. Post-translational processing includes co-translational secretion via the endoplasmic reticulum and oxidative cross-linking in the extracellular space mediated by lysyl oxidase enzymes, whose dysregulation has been linked to studies at the American Heart Association.
Elastin exhibits remarkable extensibility and recoil with low hysteresis, properties quantified in biomechanical experiments using devices from laboratories at Massachusetts Institute of Technology and ETH Zurich. Mechanical models derive from polymer physics theories developed by James G. Kirkwood and others, and techniques such as atomic force microscopy from IBM Research and tensile testing at Lawrence Berkeley National Laboratory measure parameters like Young’s modulus and resilience. The presence of desmosine cross-links, first chemically characterized by researchers associated with Albert Einstein College of Medicine, is diagnostic of mature elastin and correlates with resistance to proteolysis and thermal denaturation.
Elastin-rich fibers form elastic lamellae in the aorta, alveolar septa in the lung, elastic cartilage in the ear, and elastic fibers in dermis and ligaments such as the ligamentum flavum. In the vascular system, elastin confers compliance and pulse wave damping, a concept explored by investigators at the European Society of Cardiology and the American Physiological Society. In pulmonary physiology, elastin maintains alveolar structure and contributes to elastic recoil critical for passive exhalation, topics studied by teams at the American Thoracic Society. Developmental studies in model organisms such as Mus musculus and Danio rerio have clarified roles in organogenesis and mechanical homeostasis.
Elastogenesis primarily occurs during late fetal and early postnatal development; evidence from studies at the Max Planck Institute and pediatric research centers shows markedly reduced elastin synthesis in adulthood. Age-related fragmentation and accumulation of elastin-derived peptides contribute to changes in tissue mechanics and have been implicated in studies on skin aging at institutions such as University College London. Repair and regeneration of elastic fibers are limited; experimental approaches using growth factors, gene therapy trials reviewed by the World Health Organization, and biomaterials designed by teams at Imperial College London aim to stimulate elastin deposition and restore function after injury.
Mutations, deletions, or altered expression of the ELN locus underlie syndromes and diseases including supravalvular aortic stenosis (SVAS) characterized by arterial wall abnormalities documented by clinicians at the Mayo Clinic and Johns Hopkins Hospital. Elastic fiber fragmentation contributes to pulmonary emphysema, chronic obstructive pulmonary disease (COPD), and cutis laxa; diagnostic and epidemiological studies have been reported by the Centers for Disease Control and Prevention and academic pulmonary centers. Abnormal elastin remodeling is implicated in aneurysm formation studied at the American College of Cardiology and in skin disorders investigated by dermatology departments at Harvard Medical School.
Analytical methods include immunohistochemistry protocols standardized by the American Association of Immunologists, biochemical assays for desmosine quantified using liquid chromatography–mass spectrometry developed at Scripps Research, and molecular genetics techniques employed by consortia such as the 1000 Genomes Project. Biomedical applications exploit elastin-like polypeptides (ELPs) engineered by synthetic biology groups at MIT and ETH Zurich for drug delivery, tissue scaffolds, and injectable hydrogels in regenerative medicine trials supported by the National Institutes of Health. Elastin research interfaces with disciplines represented by organizations like the Royal Society and translational initiatives funded through programs at the European Commission.
Category:Extracellular matrix proteins