提供一篇英文科学研究论文的摘要，要求将其翻译成中文。
原文：In this study, we investigated the effects of a new drug on mice with Alzheimer's disease. We found that the drug significantly improved their cognitive function and reduced the accumulation of amyloid-beta in the brain. These results suggest that the drug may be an effective treatment for Alzheimer's disease.
翻译：本研究调查了一种新药对于老年痴呆症小鼠的影响。实验结果表明，这种药显著提高了小鼠的认知功能，减少了脑中淀粉样蛋白β的积累。这些结果表明，该药物可能是老年痴呆症有效的治疗方法。