Loss of leucine-rich repeat kinase 2 (LRRK2) in rats leads to progressive abnormal phenotypes in peripheral organs.
The objective of this study was to evaluate the pathology time course of the LRRK2 knockout rat model of Parkinson's disease at 1-, 2-, 4-, 8-, 12-, and 16-months of age. The evaluation consisted of histopathology and ultrastructure examination of selected organs, including the kidneys, lungs, spleen, heart, and liver, as well as hematology, serum, and urine analysis. The LRRK2 knockout rat, starting at 2-months of age, displayed abnormal kidney staining patterns and/or morphologic changes that were associated with higher serum phosphorous, creatinine, cholesterol, and sorbitol dehydrogenase, and lower serum sodium and chloride compared to the LRRK2 wild-type rat. Urinalysis indicated pronounced changes in LRRK2 knockout rats in urine specific gravity, total volume, urine potassium, creatinine, sodium, and chloride that started as early as 1- to 2-months of age. Electron microscopy of 16-month old LRRK2 knockout rats displayed an abnormal kidney, lung, and liver phenotype. In contrast, there were equivocal or no differences in the heart and spleen of LRRK2 wild-type and knockout rats. These findings partially replicate data from a recent study in 4-month old LRRK2 knockout rats and expand the analysis to demonstrate that the renal and possibly lung and liver abnormalities progress with age. The characterization of LRRK2 knockout rats may prove to be extremely valuable in understanding potential safety liabilities of LRRK2 kinase inhibitor therapeutics for treating Parkinson's disease.
Research Programs, The Michael J. Fox Foundation for Parkinson's Research, New York, New York, United States of America.
Marco A S
MA
Baptista
Kuldip D
KD
Dave
Mark A
MA
Frasier
Todd B
TB
Sherer
Melanie
M
Greeley
Melissa J
MJ
Beck
Julie S
JS
Varsho
George A
GA
Parker
Cindy
C
Moore
Madeline J
MJ
Churchill
Charles K
CK
Meshul
Brian K
BK
Fiske
D000818:Animals; D007668:Kidney / Q000378:metabolism / Q000473:pathology; D000071158:Leucine-Rich Repeat Serine-Threonine Protein Kinase-2; D008099:Liver / Q000378:metabolism / Q000473:pathology; D008168:Lung / Q000378:metabolism / Q000473:pathology; D008297:Male; D010641:Phenotype; D017346:Protein Serine-Threonine Kinases / Q000172:deficiency* / Q000378:metabolism*; D051381:Rats; D011922:Rats, Mutant Strains; D013154:Spleen / Q000378:metabolism / Q000473:pathology
C547428:LRRK2 protein, rat; D000071158:Leucine-Rich Repeat Serine-Threonine Protein Kinase-2; D017346:Protein Serine-Threonine Kinases