The Role of Interleukin-6 in Regulating Glomerular Filtration Rate during Angiotensin II and High Salt Conditions

Abstract

Previous results demonstrate that interleukin-6 (IL-6) increases mean arterial pressure (MAP) during Angiotensin II (Ang II)-salt hypertension. In addition, albumin excretion was lower in IL-6 knockout mice (KO) when compared to wild-type (WT). This study investigated the role of IL-6 on regulating glomerular filtration rate (GFR), renal plasma flow (RPF) and MAP in WT and IL-6 KO mice treated with a slow pressor dose of Ang II (200 ng/kg/min) +/- 6% high-salt (HS) diet. Male C57BL6 and IL-6 KO mice (12 weeks old) were treated with Ang II +/- 6% HS diet for 12 – 14 days. Mean arterial pressure, RPF and GFR were measured in anesthetized mice. MAP was 130 ± 7 mmHg and 91 ± 4 mmHg in control WT and IL-6 KO mice, respectively. Ang II treatment increased MAP in WT (153 ± 5 mmHg) and no change in IL-6 KO (83 ± 4 mmHg) mice. Ang II + 6% HS increased MAP to 150 ± 11 mmHg in WT and 93 ± 4 mmHg in IL-6 KO mice. Baseline RPF was 1822 ± 229 and 1912 ± 402 ml/min/g in control WT and IL-6 KO mice, respectively. Ang II treatment increased RPF in WT (3156 ± 753 ml/min/g), while lowering RPF in IL-6 KO (1648 ± 422 ml/min/g) mice. RPF during Ang II + 6% HS treatment was decreased in WT (1095 ± 305 ml/min/g) and IL-6 KO (1133 ml/min/g) mice. GFR was 756 ± ml/min/g and 788 ± ml/min/g in control WT and IL-6 KO mice, respectively. Ang II increased GFR in WT (1009 ± 63 ml/min/g) and no change in IL-6 KO (756 ± 23 ml/min/g). Ang II + 6% HS increased GFR in WT (1095 ± 146 ml/min/g) and no change in GFR of IL-6 KO (540 ± 207 ml/min/g) mice. Our results suggest that IL-6 reduces MAP during baseline, Ang II, and Ang II + 6% HS. The absence of IL-6 prevented increases in MAP, RPF and GFR during Ang II treatment. Our data also suggest that IL-6 contributes to increased MAP and GFR during Ang II + 6% HS treatment. K01HL092593-05. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.