Perirenal fat thickness is associated with metabolic risk factors in patients with chronic kidney disease

BACKGROUND: Adipose tissue accumulation in specific body compartments has been associated with diabetes, hypertension and dyslipidemia. Perirenal fat (PRF) may lead to have direct lipotoxic effects on renal function and intrarenal hydrostatic pressure. This study was undertaken to explore the association of PRF with cardiovascular risk factors and different stages of chronic kidney disease (CKD). METHODS: We studied 103 patients with CKD of different stages (1 to 5). PRF was measured by B-mode renal ultrasonography in the distal third between the cortex and the hepatic border and/or spleen. RESULTS: The PRF thickness was greater in CKD patients with impaired fasting glucose than in those with normal glucose levels (1.10 ± 0.40 cm vs. 0.85 ± 0.39 cm, P < 0.01). Patients in CKD stages 4 and 5 (glomerular filtration rate [GFR] < 30 mL/min/1.73 m²) had the highest PRF thickness. Serum triglyceride levels correlated positively with the PRF thickness; the PRF thickness was greater in patients with triglyceride levels ≥ 150 mg/dL (1.09 ± 0.40 cm vs. 0.86 ± 0.36 cm, P < 0.01). In patients with a GFR < 60 mL/min/1.73 m², uric acid levels correlated positively with the PRF thickness (P < 0.05). CONCLUSION: In CKD patients, the PRF thickness correlated significantly with metabolic risk factors that could affect kidney function.

Effect of Electroacupuncture on Serum Ins and the Fat Content in Male and Female Experimental Obesity Rats / 上海针灸杂志

Objective To explore the difference in the regulating effect of electroacupuncture on serum insulin (Ins) and fat consumption between male and female simple obesity rat and the possible mechanism of its action.Methods A rat model of simple obesity was made by induction with sodium glutamate. The rats were randomized into model and electroacupuncture groups (male and female), 10 rats each. A normal group of 10 rats (male and female) was established as a control. Points Quchi, Zhongwan, Guanyuan, Housanli, Fenglong and Sanyinjiao were selected in the electroacupuncture group. Stimulation with a low frequency of 2 Hz was provided after needle insertion. The treatment was given once daily for 28 consecutive days. Serum Ins content, and greater omentum, pericardiac and perirenal fat weights were measured in the male and female groups of rats before and after electroacupuncture intervention. The comparisons were made.Results Serum Ins content, and greater omentum, pericardiac and perirenal fat weights were significantly lower in the electroacupuncture male and female groups of rats than in the model male and female groups of rats (P<0.01) and also in the electroacupuncture male group of rats than in the electroacupuncture female group of rats (P<0.05).Conclusions Electroacupuncture has different degrees of weight-reducing effect in both male and female obesity rats. The reducing effect on serum Ins content, and greater omentum, pericardiac and perirenal fat weights is better in male obesity rats.

Impact of aderent perirenal fat on retroperitoneal laparoscopic partial nephrectomy / 中国内镜杂志

Objective To evaluate the impact of aderent perirenal fat (APF) on retroperitoneal laparoscopic partial nephrectomy (RLPN). Methods Clinical data of 52 patients who underwent RLPN for a small renal tumor from October 2013 to December 2015 was analyzed retrospectively. All the patients were divided into two groups according to the presence of APF by preoperative computed tomography imaging. Clinical data was collected including patients' age, gender, BMI, history of hypertension, history of diabetes, American Society of Anesthesiologists score (ASA), intra-abdominal fat (IAF), tumor size, RENAL Nephrometry score (RNS), operative time, warm ischaemia time (WIT), estimated blood loss (EBL), and length of hospital stay. Results Between the two groups, the BMI, tumor size, WIT, length of hospital stay were similar [(26.70 ± 3.33) kg/m2 vs (25.65 ± 4.01) kg/m2, (3.53 ± 1.21) cm vs (3.64 ± 1.05) cm, (27.17 ± 7.55) min vs (25.21 ± 5.64) min, (12.54 ± 4.06) d vs (10.61 ± 3.70) d, P > 0.05)], as well as the ASA and RNS. APF patients were older [(59.25 ± 11.03) y vs (49.71 ± 11.86) y, P = 0.004]. There were a high proportion of men (75.0% vs 46.4%, P = 0.036), patients with hypertension (62.5% vs 28.6%, P = 0.014), and patients with diabetes (41.7% vs 14.3%, P = 0.026). In the APF group, IAF was more [(2.02 ± 0.47) cm vs (1.35 ± 0.66) cm, P = 0.000], operative time was longer [(146.08 ± 45.45) min vs (119.32 ± 28.83) min, P = 0.017], and EBL was higher [(82.92 ± 45.73) ml vs (51.79 ± 25.10) ml, P = 0.005]. Conclusion The adherent preirenal fat sticking renal results in a longer operative time and a higher EBL, but has no influences on the WIT and length of hospital stay. APF makes it difficult to expose the tumor, not to remove it.

Histomorphometric changes in the perirenal adipocytes of adrenalectomized rats treated with dexamethasone

INTRODUCTION: Prolonged steroid treatment administered to any patient can cause visceral obesity, which is associated with metabolic disease and Cushing's syndrome. Glucocorticoids have a profound negative effect on adipose tissue mass, giving rise to obesity, which in turn is regulated by the 11β-hydroxysteroid dehydrogenase type 1 enzyme. Adrenalectomized rats treated with dexamethasone exhibited an increase in visceral fat deposition but not in body weight. OBJECTIVES: The main aim of this study was to determine the effect of dexamethasone on the histomorphometric characteristics of perirenal adipocytes of adrenalectomized, dexamethasone-treated rats (ADR+Dexa) and the association of dexamethasone treatment with the expression and activity of 11 β-hydroxysteroid dehydrogenase type 1 (11 β-hydroxysteroid dehydrogenase type 1). METHODS: A total of 20 male Sprague Dawley rats were divided into 3 groups: a baseline control group (n = 6), a sham-operated group (n = 7) and an adrenalectomized group (n=7). The adrenalectomized group was given intramuscular dexamethasone (ADR+Dexa) 2 weeks post adrenalectomy, and the rats from the sham-operated group were administered intramuscular vehicle (olive oil). RESULTS: Treatment with 120 μg/kg intramuscular dexamethasone for 8 weeks resulted in a significant decrease in the diameter of the perirenal adipocytes (p<0.05) and a significant increase in the number of perirenal adipocytes (p<0.05). There was minimal weight gain but pronounced fat deposition in the dexamethasone-treated rats. These changes in the perirenal adipocytes were associated with high expression and dehydrogenase activity of 11β-hydroxysteroid dehydrogenase type 1. CONCLUSIONS: In conclusion, dexamethasone increased the deposition of perirenal fat by hyperplasia, which causes increases in the expression and dehydrogenase activity of 11 β-hydroxysteroid dehydrogenase type 1 in adrenalectomized rats.