The immune response to influenza vaccine is attenuated in elderly persons, though they are at greatest risk for morbidity and mortality by influenza virus infection. Experimental studies demonstrate that co-administration of L-cystine and L-theanine enhanced antigen-specific production of immunoglobulin in aged mice infected with influenza virus. This study thus investigated the effect of L-cystine and L-theanine on antibody induction by influenza vaccines in elderly persons. By Koichi Miyagawa, Yoshimitsu Hayashi, Shigekazu Kurihara and Akiko Maeda, published in Geriatrics Gerentology Int’l., Japan Geriatrics Society, Vol. 8.
The common cold, an acute infection properly known as “cold syndrome,” is the most common human illness. The majority of cases of cold syndrome are acute infections of the upper respiratory tract, and its major cause is viral infection. Conventional methods of treatment use medications, such as analgesic agents and antihistamines, but these are only effective for the alleviation of symptoms, such as sneezing and runny nose. The incidence of subjects with colds during this trial was significantly lower in the CT group than in the placebo group, although the duration of the colds was not significantly different between the groups. These results suggest that CT supplementation may be useful for the prevention of the common cold. By Shigekazu Kurihara, Takenori Hiraoka, Masahisa Akutsu, Eiji Sukegawa, Makoto Bannai, and Susumu Shibahara, published in J of Amino Acids, Vol, 2010.
Men who perform resistance training 3 times a week for at least 6 months tend to have lower T-helper cell counts than non–resistance trained men. In addition, the natural killer (NK) cell count, an index of innate immunity, has been shown to decrease below the resting value after submaximal resistance exercise in both resistance-trained and non–resistance-trained men. It is a common hypothesis that resistance training impairs the immune system rather than enhancing its functions. This study examined the affects of cystine and theanine on NK cells, inflammation and immunity. By Shigeo Kawada, Kando Kobyahi, Masaru Ohtani and Chiho Fukusaki, published in J of Strength and Conditioning Research, Vol. 24, No. 3