近日,美国Braasch制药公司研发一种肥胖疫苗针剂,利用人体免疫系统对抗体重增加。《动物科学与生物技术期刊》( Journal of Animal Science and Biotechnology)发表研究文章称,实验中老鼠接受这种疫苗后4天便减少了自身体重的10%,而且这些实验中的老鼠被给予高热量的食物,这也许意味着,肥胖疫苗能让人们食用高热量食物的同时还能保持身材。
据报道,这种肥胖疫苗的工作原理在于,使人体免疫系统制造生长激素抑制素(somatostatin)的抗体。生长激素抑制素是由大脑和消化系统生成的一种激素,这种激素能抑制人体内其他的生长激素从而减慢新陈代谢,导致体重增加。重要的是,对人体至关重要的一些激素并不会受肥胖疫苗影响。
然而报道称,该研究仍旧处于早期,产品至少需要7-10年后才能上市,该疫苗仍旧需要大量研究来确认长期使用后的临床结果。据悉,目前英国市场上仅存在一种合法减肥药Xenical,这种药品能令人体减少吸收脂肪,但具有致人肠胃不适的副作用。(生物谷Bioon.com)
doi:10.1186/2049-1891-3-21
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Effects of novel vaccines on weight loss in diet-induced-obese (DIO) mice
Keith N Haffer
The purpose of the study was to test the therapeutic effects of novel vaccines for reducing weight gain and increasing weight loss in diet induced obesity (DIO) model. Male C57BL/6J mice, fed a 60% Kcal fat diet for 8 weeks prior to the start of the study, were vaccinated via the intraperitoneal route with two formulations (JH17 & JH18) of chimeric-somatostatin vaccines at 1 and 22 days of the study. Control mice were injected with PBS. All mice continued to be feed the 60% Kcal fat diet for the 6 week study. Body weights were measured two times a week and food intake was measured weekly. At week 6, mice were euthanized and a terminal bleed was made and antibody levels to somatostatin and levels of insulin-like growth factor 1 (IGF-1) were determined. Vaccination with both vaccine formulations induced a statistically significant body weight change over the study period, as compared with PBS controls. Percentage of baseline body weight was also significantly affected by vaccination during the study period. Vaccinates finished the study at 104% and 107% of baseline weight, JH17 & JH18 respectively, while untreated controls reached 115% of baseline weight. Food intake per mouse was similar in all mouse groups during the entire study. Control mice did not demonstrate any antibody titers to somatostatin, while all vaccinated mice had measurable antibody responses (> 1:500,000 titer). IGF-1 levels were not statistically significant among the groups, but were elevated in the JH18 vaccinates (mean 440.4 ng/mL) when compared with PBS controls (mean 365.6 ng/mL). Vaccination with either JH17 or JH18 chimeric -somatostatin vaccines produced a statistically significant weight loss as compared with PBS controls (P < 0.0001), even though the DIO mice with continually fed a 60% Kcal fat diet. The weight loss/lower weight gain observations were even more significant, as all mice consumed similar amounts of food for the entire study. The presence of high levels of anti-somatostatin antibodies at 6 weeks was correlative with the weight observations and confirmed the success of vaccination.