Relationship between the catalysis of Bence Jones protein and renal impairment in patients with multiple myeloma.
- Author:
Xiao ZHOU
1
;
Yong-Ping ZHAI
;
Jian-Gang MEI
;
Zhi-Ming AN
;
Xiao-Gang ZHOU
;
Ping SHI
;
Ya-Ping YU
;
Hai-Ning LIU
;
Ping SONG
Author Information
1. Department of Hematology, NaSouthern Medical University, Nanjing, Jiangsu Province, China.
- Publication Type:Journal Article
- MeSH:
Animals;
Bence Jones Protein;
metabolism;
toxicity;
Catalysis;
Coculture Techniques;
Epithelial Cells;
metabolism;
pathology;
Humans;
Kidney;
metabolism;
pathology;
Kidney Tubules;
cytology;
LLC-PK1 Cells;
Multiple Myeloma;
metabolism;
pathology;
Swine
- From:
Journal of Experimental Hematology
2012;20(2):339-343
- CountryChina
- Language:Chinese
-
Abstract:
This study was purposed to investigate the relationship between the catalysis of Bence Jones protein (BJP) in urine of patients with multiple myeloma(MM) and toxicity on the renal proximal tubular cells in vitro, and to explore the potential mechanism for the toxicity of BJP to renal impairment in patients with MM. The Michaelis-Menten constant (K(m)) and catalytic constant (k(cat)) of the amidase activity of BJP was calculated by Hanes equation. The LLC-PK1 cells were cultured with different concentration of BJP for 24 h, then proliferation of the cells were determined by MTT method and apoptosis were determined by flow cytometry. The results showed that the BJP from the MM patients with renal impairment significantly inhibited cell proliferation, as compared with that from MM patients without renal impairment. The BJP with higher k(cat) had higher toxicity to LLC-PK1 cells. BJP could induce apoptosis and necrosis of LLC-PK1 cells when reached a certain concentration and this effect enhanced with increase of BJP concentration. It is concluded that the catalysis of BJP and its toxicity to renal tubular epithelial cells has a positive correlation, and toxic effect of BJP on renal tubular epithelial cells results from inhibiting proliferation and inducing apoptosis and necrosis of the cells, which may be one of renal impairment mechanisms in MM patients.
