TY - JOUR
T1 - Antibody to transforming growth factor-β ameliorates tubular apoptosis in unilateral ureteral obstruction
AU - Miyajima, Akira
AU - Chen, Jie
AU - Lawrence, Cathy
AU - Ledbetter, Steve
AU - Soslow, Robert A.
AU - Stern, Joshua
AU - Jha, Sharda
AU - Pigato, Joseph
AU - Lemer, Matthew L.
AU - Poppas, Dix P.
AU - Vaughan, E. Darracott
AU - Felsen, Diane
N1 - Funding Information:
Akira Miyajima was supported in part by a grant from the Japan Foundation of Cardiovascular Research. Joshua Stern was in part supported by a grant from the Fan Fox and Leslie R. Samuels Foundation. We thank Dr. Jo A. Hannafin for her helpful assistance in the Flexcell system and Dr. Steven S. Gross for generous help in the citrulline assay.
PY - 2000
Y1 - 2000
N2 - Background. Unilateral ureteral obstruction (UUO) is characterized by progressive renal atrophy, renal interstitial fibrosis, an increase in renal transforming growth factor-β (TGF-β), and renal tubular apoptosis. The present study was undertaken to determine the effect of a monoclonal antibody to TGF-β (1D11) in UUO. Methods. Mechanical stretch was applied to tubular epithelial cells (NRK-52E) by a computer-assisted system. Three doses of 1D11 (either 0.5, 2, or 4 mg/rat) were administered to rats one day prior to UUO and every two days thereafter, and kidneys were harvested at day 13. Fibrosis was assessed by measuring tissue hydroxyproline and mRNA for collagen and fibronectin. Apoptosis was assessed with the terminal deoxy transferase uridine triphosphate nick end-labeling assay. TGF-β levels were determined by bioassay. Western blot and immunostaining were used to identify proliferating cell nuclear antigen (PCNA), p53, bcl-2, and inducible nitric oxide synthase (iNOS). Results. Stretch significantly induced apoptosis in NRK-52E cells, which was accompanied by an increased release of TGF-β; 1D11 (10 μg/mL) totally inhibited stretch-induced apoptosis. Control obstructed kidney contained 20-fold higher TGF-β as compared with its unobstructed kidney; 1D11 neutralized tissue TGF-β of the obstructed kidney. Control obstructed kidney exhibited significantly more fibrosis and tubular apoptosis than its unobstructed counterpart, which was blunted by 1D11. In contrast, 1D11 significantly increased tubular proliferation. p53 immunostaining was localized to renal tubular nuclei of control obstructed kidney and was diminished by 1D11. In contrast, bcl-2 was up-regulated in the 1D11-treated obstructed kidney. Total NOS activity and iNOS activity of the obstructed kidney were increased by 1D11 treatment. Conclusion. The present study strongly suggests that an antibody to TGF-β is a promising agent to prevent renal tubular fibrosis and apoptosis in UUO.
AB - Background. Unilateral ureteral obstruction (UUO) is characterized by progressive renal atrophy, renal interstitial fibrosis, an increase in renal transforming growth factor-β (TGF-β), and renal tubular apoptosis. The present study was undertaken to determine the effect of a monoclonal antibody to TGF-β (1D11) in UUO. Methods. Mechanical stretch was applied to tubular epithelial cells (NRK-52E) by a computer-assisted system. Three doses of 1D11 (either 0.5, 2, or 4 mg/rat) were administered to rats one day prior to UUO and every two days thereafter, and kidneys were harvested at day 13. Fibrosis was assessed by measuring tissue hydroxyproline and mRNA for collagen and fibronectin. Apoptosis was assessed with the terminal deoxy transferase uridine triphosphate nick end-labeling assay. TGF-β levels were determined by bioassay. Western blot and immunostaining were used to identify proliferating cell nuclear antigen (PCNA), p53, bcl-2, and inducible nitric oxide synthase (iNOS). Results. Stretch significantly induced apoptosis in NRK-52E cells, which was accompanied by an increased release of TGF-β; 1D11 (10 μg/mL) totally inhibited stretch-induced apoptosis. Control obstructed kidney contained 20-fold higher TGF-β as compared with its unobstructed kidney; 1D11 neutralized tissue TGF-β of the obstructed kidney. Control obstructed kidney exhibited significantly more fibrosis and tubular apoptosis than its unobstructed counterpart, which was blunted by 1D11. In contrast, 1D11 significantly increased tubular proliferation. p53 immunostaining was localized to renal tubular nuclei of control obstructed kidney and was diminished by 1D11. In contrast, bcl-2 was up-regulated in the 1D11-treated obstructed kidney. Total NOS activity and iNOS activity of the obstructed kidney were increased by 1D11 treatment. Conclusion. The present study strongly suggests that an antibody to TGF-β is a promising agent to prevent renal tubular fibrosis and apoptosis in UUO.
KW - Cell death
KW - Fibrosis
KW - Monoclonal antibody
KW - Progressive renal atrophy
KW - Renal tubular obstruction
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U2 - 10.1046/j.1523-1755.2000.00414.x
DO - 10.1046/j.1523-1755.2000.00414.x
M3 - Article
C2 - 11115064
AN - SCOPUS:0033667371
SN - 0085-2538
VL - 58
SP - 2301
EP - 2313
JO - Kidney international
JF - Kidney international
IS - 6
ER -