请将这段话改写避免与原文出现连续5个字相同的句子使语言更高级：Recent studies have proposed a pivotal role for microRNAs miRNAs in aging and neurodegenerative diseases by demonstrating that the expression levels of several miRNAs we

Emerging research has shed light on the crucial involvement of microRNAs (miRNAs) in the processes of aging and neurodegenerative disorders. These studies have revealed noteworthy changes in the expression levels of various miRNAs, providing compelling evidence for their impact on cellular senescence and neurodegeneration.