MEDICAL RESEARCH BANGLADESH ( BD )

Natural killer cell From Wikipedia, the free encyclopedia   (Redirected from Natural Killer cell ) Jump to: navigation , search Natural killer cells (or NK cells ) are a type of cytotoxic lymphocyte critical to the innate immune system . The role NK cells play is analogous to that of cytotoxic T cells in the vertebrate adaptive immune response . NK cells provide rapid responses to virally infected cells and respond to tumor formation, acting at around 3 days after infection . Typically immune cells detect MHC presented on infected cell surfaces, triggering cytokine release causing lysis or apoptosis . NK cells are unique, however, as they have the ability to recognize stressed cells in the absence of antibodies and MHC, allowing for a much faster immune reaction. They were named “natural killers” because of the initial notion that they do not require activation in order...

Baldness as a Signal of Heart Disease Risk Courtesy : NY Times and BMJ online. Baldness may indicate an increased risk for coronary heart disease. The risk is associated only with male pattern baldness, the kind that starts at the top or back of the head, and not with a receding hairline, according to researchers who reviewed six studies that included 37,000 participants. The analysis, published online in BMJ Open , found that baldness increased the risk for heart disease by between 30 and 40 percent compared with men with a full head of hair. They found the association among men 55 to 60 as well as among older men, and the more severe the baldness, the greater the risk. The reason for the association is unclear, but the authors suggest that known risk factors for heart disease — hypertension, high cholesterol, smoking and others — may affect both conditions, and that baldness may be a marker of atherosclerosis. In previous studies, baldness has been linked to an increased risk...