Renal sinus fat and renal hemodynamics: a cross-sectional analysis

Area of Science:

• Nephrology
• Diabetology
• Cardiovascular Science

Background:

• Increased renal sinus fat (RSF) is associated with hypertension and chronic kidney disease (CKD).
• The underlying mechanisms linking RSF to kidney dysfunction are not fully understood.
• Type 2 diabetes (T2D) is a major risk factor for CKD.

Purpose of the Study:

• To evaluate the relationship between RSF and gold-standard measures of renal hemodynamics.
• To investigate the association between RSF and renal vascular resistance in T2D patients.

Main Methods:

• Fifty-one T2D patients underwent MRI to quantify RSF, subcutaneous adipose tissue (SAT), and visceral adipose tissue (VAT).
• Glomerular filtration rate (GFR) and effective renal plasma flow (ERPF) were measured using inulin and para-aminohippuric acid (PAH) clearances.
• Effective renal vascular resistance (ERVR) was calculated from mean arterial pressure (MAP), GFR, and ERPF.

Main Results:

• RSF volume negatively correlated with GFR (r = -0.38, p = 0.006) and ERPF (r = -0.38, p = 0.006).
• RSF volume positively correlated with MAP (r = 0.29, p = 0.039) and ERVR (r = 0.45, p = 0.001).
• These associations persisted after adjusting for VAT, MAP, sex, and BMI, with ERVR remaining significantly related to RSF after age correction.

Conclusions:

• Higher RSF volume is negatively associated with GFR in T2D patients.
• RSF volume is positively associated with increased renal vascular resistance, potentially mediating hypertension and CKD development.
• Further research is needed to elucidate how RSF influences renal vascular resistance.