Additively manufactured porous scaffolds by design for treatment of bone defects

There has been increasing attention to produce porous scaffolds that mimic human bone properties for enhancement of tissue ingrowth, regeneration, and integration. Additive manufacturing (AM) technologies, i.e., three dimensional (3D) printing, have played a substantial role in engineering porous scaffolds for clinical applications owing to their high level of design and fabrication flexibility. To this end, this review article attempts to provide a detailed overview on the main design considerations of porous scaffolds such as permeability, adhesion, vascularisation, and interfacial features and their interplay to affect bone regeneration and osseointegration. Physiology of bone regeneration was initially explained that was followed by analysing the impacts of porosity, pore size, permeability and surface chemistry of porous scaffolds on bone regeneration in defects. Importantly, major 3D printing methods employed for fabrication of porous bone substitutes were also discussed. Advancements of MA technologies have allowed for the production of bone scaffolds with complex geometries in polymers, composites and metals with well-tailored architectural, mechanical, and mass transport features. In this way, a particular attention was devoted to reviewing 3D printed scaffolds with triply periodic minimal surface (TPMS) geometries that mimic the hierarchical structure of human bones. In overall, this review enlighten a design pathway to produce patient-specific 3D-printed bone substitutions with high regeneration and osseointegration capacity for repairing large bone defects

A Review on Biosensors for Quantification of MCP-1 as a Potential Biomarker in Diseases

Monocyte chemoattractant protein-1 (MCP-1) as a chemokine is essential for inflammation-related processes. It regulates immunological responses and cell migration, which contribute to inflammation. Many disorders are exacerbated by this chemokine, which attracts or grows other inflammatory cells, including monocytes/macrophages, at the site of infection or tissue injury. The elevated concentrations of MCP-1 are associated with the pathogenesis of many diseases, such as cancer, cardiovascular disease, kidney disease, and neuroinflammatory disease. Therefore, monitoring this inflammatory biomarker in the body has been recommended and strongly advised to make an accurate diagnosis and prognosis. Although MCP-1 is of great importance in disease processes, few biosensing approaches are specifically designed to detect this molecule. These are often electrochemical and optical techniques. Rapid and accurate diagnosis of inflammatory diseases by identifying biomarkers has had a great effect on the advancement of biosensors. Improved biosensor technology expansion prevents excessive prices and low sensitivity, enabling quick and correct diagnosis and tracking of disease processes. This review will concentrate on the biological functions of MCP-1, its significance in different disorders, and the features and applications of biosensors designed for MCP-1 detection and quantification