Lubricin restoration in a mouse model of congenital deficiency.

Autor: Hill A; Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts., Waller KA; Alpert Medical School of Brown University and Rhode Island Hospital, Providence., Cui Y; Boston Children's Hospital, Boston, Massachusetts., Allen JM; Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts., Smits P; Boston Children's Hospital, Boston, Massachusetts., Zhang LX; Alpert Medical School of Brown University and Rhode Island Hospital, Providence., Ayturk UM; Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts., Hann S; Boston Children's Hospital, Boston, Massachusetts., Lessard SG; Boston Children's Hospital, Boston, Massachusetts., Zurakowski D; Boston Children's Hospital, Boston, Massachusetts., Warman ML; Howard Hughes Medical Institute, Boston Children's Hospital, and Harvard Medical School, Boston, Massachusetts., Jay GD; Rhode Island Hospital, Alpert Medical School of Brown University, and Brown University School of Engineering, Providence, Rhode Island.
Jazyk: angličtina
Zdroj: Arthritis & rheumatology (Hoboken, N.J.) [Arthritis Rheumatol] 2015 Nov; Vol. 67 (11), pp. 3070-81.
DOI: 10.1002/art.39276
Abstrakt: Objective: Congenital deficiency of the principal boundary lubricant in cartilage (i.e., lubricin, encoded by the gene PRG4) increases joint friction and causes progressive joint failure. This study was undertaken to determine whether restoring lubricin expression in a mouse model would prevent, delay, or reverse the disease process caused by congenital deficiency.
Methods: Using genetically engineered lubricin-deficient mice, we restored gene function before conception or at ages 3 weeks, 2 months, or 6 months after birth. The effect of restoring gene function (i.e., expression of lubricin) on the tibiofemoral patellar joints of mice was evaluated histologically and by ex vivo biomechanical testing.
Results: Restoring gene function in mice prior to conception prevented joint disease. In 3-week-old mice, restoring gene function improved, but did not normalize, histologic features of the articular cartilage and whole-joint friction. In addition, cyclic loading of the joints produced fewer activated caspase 3-containing chondrocytes when lubricin expression was restored, as compared to that in littermate mice whose gene function was not restored (nonrestored controls). Restoration of lubricin expression in 2-month-old or 6-month-old mice had no beneficial effect on histopathologic cartilage damage, extent of whole-joint friction, or activation of caspase 3 when compared to nonrestored controls.
Conclusion: When boundary lubrication is congenitally deficient and cartilage becomes damaged, the window of opportunity for restoring lubrication and slowing disease progression is limited.
(© 2015, American College of Rheumatology.)
Databáze: MEDLINE
Externí odkaz: