Abstract:
Increased urinary albumin excretion also known as microalbuminuria (MAU), is the earliest clinical manifestation of diabetic nephropathy. Thus, the determination of albumin in urine is very useful for clinical diagnosis. Herein, monoclonal antibodies against human serum albumin (HSA) have been produced and characterized. To obtain the hybridomas, spleen cells from HSA immunized mice (BALB/c) were fused with SP2/0 myeloma cells. The single hybridoma cell was obtained using limiting dilutions. As a result, 4/B11/G3/H11/G11 was selected for further study. The sensitivity reported as the half maximal inhibitory concentration (IC₅₀) of HSA was 0.30 µg/ml, as assessed by indirect competitive ELISA. To demonstrate the ability of generated mAbs to MAU determining, indirect competitive ELISA using those mAb has been developed. The results showed good correlation with the conventional immunonephelometry method (r² = 0.971, n = 7) for the detection range of 0.7-40 µg/ml at the limit of detection of 0.057 µg/ml. Variation of the analysis of both intra- and inter-variation assay was tested. The result showed that the coefficient of variations were 3.02-4.23% and 15.02-16.79 %, respectively. In conclusion, the generated mAbs were very promising for further development of the microalbuminuria assay kit.