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NATURAL LIGHT IN OFFICE BOOSTS HEALTH

Office workers with more light exposure at the office had longer sleep duration, better sleep quality, more physical activity and better quality of life compared to office workers with less light exposure in the workplace, reports a new study from Northwestern Medicine and the University of Illinois at Urbana-Champaign.

The study highlights the importance of exposure to natural light to employee health and the priority architectural designs of office environments should place on natural daylight exposure for workers, the study authors said.

Employees with windows in the workplace received 173 percent more white light exposure during work hours and slept an average of 46 minutes more per night than employees who did not have the natural light exposure in the workplace. There also was a trend for workers in offices with windows to have more physical activity than those without windows.

Workers without windows reported poorer scores than their counterparts on quality of life measures related to physical problems and vitality, as well as poorer outcomes on measures of overall sleep quality and sleep disturbances.

The study was reported in the Journal of Clinical Sleep Medicine in June.

"There is increasing evidence that exposure to light, during the day, particularly in the morning, is beneficial to your health via its effects on mood, alertness and metabolism," said senior study author Phyllis Zee, M.D., a Northwestern Medicine neurologist and sleep specialist. "Workers are a group at risk because they are typically indoors often without access to natural or even artificial bright light for the entire day. The study results confirm that light during the natural daylight hours has powerful effects on health."

Zee is the Benjamin and Virginia T. Boshes Professor of Neurology at Northwestern University Feinberg School of Medicine and director of the Sleep Disorders Center at Northwestern Memorial Hospital.

"Architects need to be aware of the importance of natural light not only in terms of their potential energy savings but also in terms of affecting occupants' health," said co-lead author Mohamed Boubekri, an associate professor of architecture at the University of Illinois at Urbana-Champaign.

A simple design solution to augment daylight penetration in office buildings would be to make sure the workstations are within 20 to 25 feet of the peripheral walls containing the windows, noted Boubekri. "Daylight from side windows almost vanishes after 20 to 25 feet from the windows," he said.

The study group included 49 day-shift office workers; 27 in windowless workplaces and 22 in workplaces with windows. Health-related quality of life and sleep quality were measured with a self-reported form and sleep quality was evaluated with the Pittsburgh Sleep Quality Index (PSQI). Light exposure, activity and sleep were measured by actigraphy in a representative subset of 21 participants; 10 in windowless workplaces and 11 in workplaces with windows.

Actigraphy is a single device worn on the wrist that gives measures of light exposure as well as activity and sleep. This is an ambulatory physiological data logger that records motion and light illuminance. The motion was used to determine activity levels during waking time and to calculate sleep time. The light luminance was used for measures of light exposure during the workday period.

"Light is the most important synchronizing agent for the brain and body," said Ivy Cheung, co-lead author and Ph.D. candidate in neuroscience in Zee's lab at Northwestern. "Proper synchronization of your internal biological rhythms with the earth's daily rotation has been shown to be essential for health."

Also, people who get more light during the day may sleep better at night, which can also help improve health, Zee noted.

NATURAL KILLER CELLS BATTLE PEDIATRIC LEUKEMIA

Researchers at Children's Hospital Los Angeles have shown that a select team of immune-system cells from patients with leukemia can be multiplied in the lab, creating an army of natural killer cells that can be used to destroy the cancer cells. Results of their in vitro study, published August 19 in the journal Leukemia, could one day provide a less toxic and more effective way to battle this cancer in children

Acute lymphoblastic leukemia (ALL) is the most common cancer of childhood. This disease hinders the development of healthy blood cells while cancer cells proliferate. Currently, children with ALL receive chemotherapy for two to three years, exposing them to significant side effects including changes in normal development and future fertility.

As a way to avoid these adverse effects, investigators have been researching how to supercharge the body's innate cancer-fighting ability -- a technique called immunotherapy. One branch of the immune system -- and a possible component of immunotherapy -- includes a class of cells called natural killer (NK) cells. These specialized white blood cells police the body and destroy abnormal cells before they turn cancerous.

Using NK cells as immunotherapy presents challenges. If the cells come from a donor, the patient might reject the cells or worse, be at risk for graft-versus-host disease -- where contaminating donor cells regard the patient's body as foreign and attack it. To avoid these problems, the researchers wondered if they could enlist the help of the patients' own, or autologous, NK cells. Using autologous cells would remove the risks associated with donor cells.

But using autologous cells raised other issues. Would it be possible to multiply NK cells from patients with leukemia, even though they had very few to start with? Also, could the patient's own NK cells attack their leukemia… and win?

"In this study, we used NK cells and ALL cells from the same pediatric patients. We found that autologous natural killer cells will destroy the patient's leukemia cells," said Nora Heisterkamp, PhD, of The Saban Research Institute of Children's Hospital Los Angeles and one of the co-lead investigators.

To help the NK cells identify their target as leukemia cells, the researchers also added a monoclonal antibody. Antibodies are normally made by cells of the immune system to identify and neutralize foreign material. Researchers can design and produce antibodies, called monoclonal antibodies (mAb), that specifically target a certain protein like the ones found on cancer cells. In a previous paper, Heisterkamp showed that a mAb targeted to a specific receptor (BAFF-R) on the leukemia cells stimulated the NK cells to attack and kill the cancer. The BAFF-R mAb was also used in this study.

"These results are very promising -- with potential as a part of first line therapy and also as a treatment for eliminating any remaining cancer cells, known as minimal residual disease, following standard chemotherapy," said Hisham Abdel-Azim, MD, of Children's Hospital Los Angeles and co-lead investigator on the study. "We anticipate additional pre-clinical testing and then, a clinical trial to evaluate the therapy in children with leukemia."