Randomized Trials in Cardiovascular Imaging: Where to Next?

Scientific progress and clinical uncertainty

In the path underway towards Precision Medicine, two areas are in rapid development: genetics and artificial intelligence. In the genetic area, there are two current problems, both of the highest social importance. The first concerns the project, emerging in some countries, of systematic sequencing of the genome in the whole population. The problem is that reading the genome is very complex, requires specific knowledge, and the medical class is now unprepared. The second problem concerns the now achieved ability to modify the genome, which might be applied in the treatment of genetic diseases previously considered incurable. The techniques that can be used today are extremely delicate and expose to high risks. Artificial intelligence (AI) is a branch of neuroscience ('computational neuroscience') and advanced computer science which aims to apply the operational models of the human mind with the mnemonic and calculating power of advanced cybernetics. It is applied by conventional smartphone 'apps' to the most advanced computers used in various areas of diagnostic and prognostic medicine, image reading, big data management, setting of new pharmacological molecules, up to completely different applications, such as spoken language, automatic driving of vehicles, insurance plans, financial strategies, etc. Of course, with enormously different degrees of complexity. Will the doctors' role survive?

Vitamin C in Stem Cell Biology: Impact on Extracellular Matrix Homeostasis and Epigenetics

Transcription factors and signaling molecules are well-known regulators of stem cell identity and behavior; however, increasing evidence indicates that environmental cues contribute to this complex network of stimuli, acting as crucial determinants of stem cell fate. l-Ascorbic acid (vitamin C (VitC)) has gained growing interest for its multiple functions and mechanisms of action, contributing to the homeostasis of normal tissues and organs as well as to tissue regeneration. Here, we review the main functions of VitC and its effects on stem cells, focusing on its activity as cofactor of Fe⁺²/αKG dioxygenases, which regulate the epigenetic signatures, the redox status, and the extracellular matrix (ECM) composition, depending on the enzymes' subcellular localization. Acting as cofactor of collagen prolyl hydroxylases in the endoplasmic reticulum, VitC regulates ECM/collagen homeostasis and plays a key role in the differentiation of mesenchymal stem cells towards osteoblasts, chondrocytes, and tendons. In the nucleus, VitC enhances the activity of DNA and histone demethylases, improving somatic cell reprogramming and pushing embryonic stem cell towards the naive pluripotent state. The broad spectrum of actions of VitC highlights its relevance for stem cell biology in both physiology and disease.