Hi Togo,
Even as a scientist, that sentence means nothing to me. It seems that the important few words are "curcumin induces the expression of LRRK2 mRNA and protein". But what do they mean by expression. Also, protein is "expressed" also, yet you can't say all protein is bad.
There is such a wealth of positive information about curcumin's beneficial effects that I should not spend time trying to decipher this reference. Do a search both on the web and on this site, and you will only find beneficial properties for curcumin.
Ron