Considering Mineralization in Aging
Is the mineralization of connective tissue important in aging and something that should be addressed separately from other forms of change that occur in old tissues? These researchers think so:
When you open a 70-year old patient on the operating table and touch the aorta, the feeling may resemble touching an eggshell or sand paper. It is stiffer than the heart of a young person and the key reasons for this are the abundant calcium deposits in the connective tissue that accumulate with age. The many factors leading to mineralization of the connective tissue include genetic and acquired diseases, inflammation, reactive oxygen species, but the major problem is that it occurs spontaneously during aging as calcium-containing molecules are trapped in the extracellular matrix and develop into apatite over time.
"Aging inevitably leads to the loss of function on many levels. Mineralization of the connective tissue is one of the causes and consequences of aging and is a complex multifactorial process. Metabolic activity, diseases and external stress factors may cause calcification, but most importantly, it occurs spontaneously. Our goal is to identify least toxic ways to both prevent calcification and to repair the accumulated aggregates. Mineralization of connective tissue with age is one of the many aspects of aging that are examples of 'accumulation of eventually pathogenic extracellular material', an issue that attracts too little attention within the academic community. The accumulation of advanced glycation endproducts (AGEs) and of mineral deposits both result in increased stiffness of connective tissue, impair homeostasis and contribute to a broad range of age-related diseases."