PURPOSE: To study whether aqueous humor (AH) and plasma adiponectin (APN) levels were altered in proliferative diabetic retinopathy (PDR). MATERIALS AND METHODS: After excluding subjects with hypertension, hyperlipidaemia, nephropathy, coronary heart disease, heart and renal failure, 20 consecutive type 2 diabetes mellitus (DM) PDR patients and 20 consecutive age-matched non-diabetic and senile cataract (non-DM) controls were enrolled in this study. AH APN and plasma APN concentrations were determined by enzyme-linked immunosorbent assay (ELISA). The expression of AdipoR1/R2 mRNA in peripheral blood mononuclear cells (PBMCs) was measured by real-time polymerase-chain reaction (PCR). The correlations between two parameters, including plasma and AH APN, AdipoR1/R2, plasma insulin and plasma glucose, were analyzed by Pearson's correlation. RESULTS: In non-DM subjects, the APN concentration in AH was 1.26 ± 0.56 ng/ml, approximately 1/2500 of that in plasma (3.15 ± 1.36 μg/ml). The averaged AH APN concentration in PDR patients was significant higher than that of the non-DM controls (5.29 ± 4.09 ng/ml vs. 1.26 ± 0.56 ng/ml, p < 0.001). Plasma total APN was not correlated with AH APN in the PDR patients, controls or all subjects. No significant difference was observed in plasma total APN levels and AdipoR1/R2 mRNA levels in PBMCs between the PDR patients and the controls (p > 0.05). CONCLUSION: Differences in APN concentration between AH and plasma suggest blood-retinal barrier (BRB) plays a key role in maintaining intraocular APN homeostasis. The high APN level in AH may be associated with PDR.
PURPOSE: To study whether aqueous humor (AH) and plasma adiponectin (APN) levels were altered in proliferative diabetic retinopathy (PDR). MATERIALS AND METHODS: After excluding subjects with hypertension, hyperlipidaemia, nephropathy, coronary heart disease, heart and renal failure, 20 consecutive type 2 diabetes mellitus (DM) PDR patients and 20 consecutive age-matched non-diabetic and senile cataract (non-DM) controls were enrolled in this study. AH APN and plasma APN concentrations were determined by enzyme-linked immunosorbent assay (ELISA). The expression of AdipoR1/R2 mRNA in peripheral blood mononuclear cells (PBMCs) was measured by real-time polymerase-chain reaction (PCR). The correlations between two parameters, including plasma and AH APN, AdipoR1/R2, plasma insulin and plasma glucose, were analyzed by Pearson's correlation. RESULTS: In non-DM subjects, the APN concentration in AH was 1.26 ± 0.56 ng/ml, approximately 1/2500 of that in plasma (3.15 ± 1.36 μg/ml). The averaged AH APN concentration in PDR patients was significant higher than that of the non-DM controls (5.29 ± 4.09 ng/ml vs. 1.26 ± 0.56 ng/ml, p < 0.001). Plasma total APN was not correlated with AH APN in the PDR patients, controls or all subjects. No significant difference was observed in plasma total APN levels and AdipoR1/R2 mRNA levels in PBMCs between the PDR patients and the controls (p > 0.05). CONCLUSION: Differences in APN concentration between AH and plasma suggest blood-retinal barrier (BRB) plays a key role in maintaining intraocular APN homeostasis. The high APN level in AH may be associated with PDR.
Authors: Zhongjie Fu; Yan Gong; Raffael Liegl; Zhongxiao Wang; Chi-Hsiu Liu; Steven S Meng; Samuel B Burnim; Nicholas J Saba; Thomas W Fredrick; Peyton C Morss; Ann Hellstrom; Saswata Talukdar; Lois E H Smith Journal: Cell Rep Date: 2017-02-14 Impact factor: 9.423
Authors: Jane Z Kuo; Xiuqing Guo; Ronald Klein; Barbara E Klein; Pauline Genter; Kathryn Roll; Yang Hai; Mark O Goodarzi; Jerome I Rotter; Yii-Der Ida Chen; Eli Ipp Journal: J Clin Endocrinol Metab Date: 2015-05-28 Impact factor: 5.958