Long-term uninterrupted enzyme replacement therapy prevents liver disease in murine model of severe homocystinuria.
Hum Mutat
; 41(9): 1662-1670, 2020 09.
Article
in En
| MEDLINE
| ID: mdl-32623804
ABSTRACT
Classical homocystinuria (HCU) is an inborn error of metabolism caused by loss of cystathionine ß-synthase (CBS) activity with the concomitant buildup of homocysteine. In knockout (KO) mice, a mouse model of HCU, complete lack of CBS is neonatally lethal. Administration of OT-58, an enzyme therapy for HCU, during the first 5 weeks of life rescued KO mice survival by preventing liver disease. Here, we studied the impact of a long-term uninterrupted OT-58 treatment or its absence beyond the neonatal period on liver pathology and metabolism. Plasma and liver metabolites of KO mice on OT-58 treatment were substantially improved or normalized compared with those receiving vehicle. Increased plasma activities of alanine aminotransferase and aspartate aminotransferase of vehicle-injected KO mice suggested the progression of liver damage with age and lack of treatment. At 3 months of age, liver histology showed no signs of hepatopathy in both vehicle- and OT-58-treated KO mice. However, moderate to severe liver disease, characterized by steatosis, hepatocellular necroses, disorganized endoplasmic reticulum, and swollen mitochondria, developed in 6-month-old vehicle-injected KO mice. KO mice on OT-58 treatment remained asymptomatic and were indistinguishable from age-matched healthy controls. Long-term uninterrupted OT-58 treatment was essential to prevent severe liver disease in the KO mouse model of HCU.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Enzyme Replacement Therapy
/
Homocystinuria
/
Liver Diseases
Limits:
Animals
Language:
En
Journal:
Hum Mutat
Journal subject:
GENETICA MEDICA
Year:
2020
Type:
Article