TY - JOUR
T1 - Urine exosomal ceruloplasmin
T2 - a potential early biomarker of underlying kidney disease
AU - Gudehithlu, Krishnamurthy P.
AU - Hart, Peter
AU - Joshi, Amit
AU - Garcia-Gomez, Ignacio
AU - Cimbaluk, David J.
AU - Dunea, George
AU - Arruda, Jose A.L.
AU - Singh, Ashok K.
N1 - Funding Information:
The authors thank Dr. Lev Rappoport and Ms. Anu Hakimiyan for help with the histologic processing of tissue. This work was financially supported by Hektoen Institute for Medicine, Chicago IL (1994–present).
Funding Information:
The authors thank Dr. Lev Rappoport and Ms. Anu Hakimiyan for help with the histologic processing of tissue. This work was financially supported by Hektoen Institute for Medicine, Chicago IL (1994?present).
Publisher Copyright:
© 2019, Japanese Society of Nephrology.
PY - 2019/8/1
Y1 - 2019/8/1
N2 - Background: Previously we found that kidney tissue and urinary exosomes from patients of diabetic kidney disease showed high levels of ceruloplasmin (CP). Because CP is an acute-phase protein of kidney origin, it could be an early marker of many other kidney diseases. To investigate this hypothesis, we first measured urine exosomal and kidney expression of CP in non-diabetic chronic kidney disease (CKD) patients (membranous nephropathy, focal segmental glomerulosclerosis, lupus nephritis and IgA nephropathy) followed by a longitudinal study in rat passive Heymann nephritis (PHN), a model of human membranous nephropathy. Methods: Urinary exosomes were isolated from urine of patients (and rats) by differential centrifugation. The exosomal extracts were used for measuring CP using ELISA. Kidney expression of CP was evaluated by immune-staining biopsy tissues. Similar techniques were applied in rat PHN model (produced by injection of anti-gp600 antiserum) to analyze urine exosomal and kidney CP. Results: Urine exosomal CP levels were 10–20 times higher in CKD patients than in controls; consistent with this we found high immune-reactive CP localized in tubules and collecting ducts of biopsies of CKD patients. In the PHN model urinary exosomal CP level was significantly higher prior to the onset of proteinuria. Early rise of urine exosomal CP, which preceded proteinuria, correlated with high immunoreactive CP found in rat kidneys at this time. Conclusion: We propose that urine exosomal CP, observed to increase prior to proteinuria, makes it a potential urinary biomarker to diagnose early kidney disease.
AB - Background: Previously we found that kidney tissue and urinary exosomes from patients of diabetic kidney disease showed high levels of ceruloplasmin (CP). Because CP is an acute-phase protein of kidney origin, it could be an early marker of many other kidney diseases. To investigate this hypothesis, we first measured urine exosomal and kidney expression of CP in non-diabetic chronic kidney disease (CKD) patients (membranous nephropathy, focal segmental glomerulosclerosis, lupus nephritis and IgA nephropathy) followed by a longitudinal study in rat passive Heymann nephritis (PHN), a model of human membranous nephropathy. Methods: Urinary exosomes were isolated from urine of patients (and rats) by differential centrifugation. The exosomal extracts were used for measuring CP using ELISA. Kidney expression of CP was evaluated by immune-staining biopsy tissues. Similar techniques were applied in rat PHN model (produced by injection of anti-gp600 antiserum) to analyze urine exosomal and kidney CP. Results: Urine exosomal CP levels were 10–20 times higher in CKD patients than in controls; consistent with this we found high immune-reactive CP localized in tubules and collecting ducts of biopsies of CKD patients. In the PHN model urinary exosomal CP level was significantly higher prior to the onset of proteinuria. Early rise of urine exosomal CP, which preceded proteinuria, correlated with high immunoreactive CP found in rat kidneys at this time. Conclusion: We propose that urine exosomal CP, observed to increase prior to proteinuria, makes it a potential urinary biomarker to diagnose early kidney disease.
KW - Ceruloplasmin
KW - Chronic kidney disease
KW - Exosomes
KW - Heymann nephritis
KW - Immunohistochemistry
KW - Proteinuria
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U2 - 10.1007/s10157-019-01734-5
DO - 10.1007/s10157-019-01734-5
M3 - Article
C2 - 30955187
AN - SCOPUS:85064247185
VL - 23
SP - 1013
EP - 1021
JO - Clinical and Experimental Nephrology
JF - Clinical and Experimental Nephrology
SN - 1342-1751
IS - 8
ER -
