An analysis of 15 years of national data on suicides and homicides shows that nocturnal wakefulness is associated with death by both suicide and homicide, possibly driven by deficits in behavioral and emotional regulation.

Risks for death by suicide and homicide peak at night, with nocturnal wakefulness, age, alcohol use, and relationship conflicts being especially prevalent as contributing factors. This is according to a new analysis by researchers in the Department of Psychiatry at the University of Arizona College of Medicine – Tucson.

The immune system provides an integral defense against cancer growth and progression. Activating an anti-tumor immune response relies on several biological steps that can ultimately result in the elimination of tumor cells. T cell activation, a process requiring three “signals,” is required for optimal anti-tumor immunity.

T cells, immune cells generated in the thymus, have a programmed affinity for a specific particle foreign to the body. T cells must become specially “trained” to recognize this foreign protein, known as an antigen. After leaving the thymus, T cells circulate throughout the body in search of their antigen.

Antigen presenting cells (APCs) comprise another category of immune cells required for effective anti-tumor immunity. APCs also circulate the body, where they locate, process, and “present” pieces of antigen on their surface. A surface molecule called a major histocompatibility complex (MHC) holds the antigen on the outside of the APC.

A recent article in Cell Reports Medicine, by Dr. Felipe Andrade, uncovers insights into lupus symptoms. More specifically, how these symptoms can range in severity among individuals. Andrade is a principal investigator and Associate Professor at the Johns Hopkins School of Medicine and specializes in rheumatology. His work focuses on the mechanisms of systemic autoimmune disease and the role of proteins that mediate this mechanism.

Lupus is an autoimmune disorder in which the body attacks its own tissues and cells. A chronic inflammatory disease, lupus affects about 1.5 million Americans. While the cause of lupus is unknown, there are several subsets including, systemic lupus erythematosus (SLE), cutaneous lupus, drug-induced lupus, and neonatal lupus. The most common subset is SLE with symptoms that include muscle/joint pain, fever, rashes, chest pain, hair loss, fatigue, mouth sores, kidney issues, and others. Unfortunately, there is no cure for lupus, but medication and lifestyle changes help moderate the symptoms. Medication that prevents or reduces inflammation are usually prescribed with other therapies that target pain and protect tissue damage.

Andrade and others explored the underlying mechanism that drives lupus. Researchers conclude that immune proteins, known as interferons, are elevated in lupus and can cause lupus-related symptoms including rashes, chest pain, fatigue, and soreness. Interferons help regulate inflammation and attract immune cells to the site of infection. In a healthy immune system interferon helps fight off infection. However, in the context of lupus, the protein helps to prolong inflammation that causes deterioration of tissues and cells.