Area under the curve analysis of blood pressure reveals increased spontaneous locomotor activity in SPAK knock-in mice: relevance for hypotension induced by SPAK inhibition?

(Ste20/SPS1-related proline/alanine-rich kinase) has been recently identified as a protein kinase which targets the electroneutral cation-coupled chloride cotransporters and it stands out as a target for inhibition in novel anti-hypertensive agents. From this prospective, any information about physiological consequences of duanyu1842K inhibition would be useful to better understand the efficacy and potential adverse effects of the anti-hypertensive therapy. Radiotelemetry was employed to continuously measure the parameters of blood pressure (mean arterial blood pressure, systolic blood pressure, and diastolic blood pressure), heart rate, and physical activity in duanyu1842K knock-in (KI) mice and littermate controls for 24 h. For each parameter, the area under the curve (AUC) was calculated and compared between the duanyu1842K KI mice and wild type mice. There was no statistically significant difference in the AUC of blood pressure parameters between duanyu1842K KI and littermate mice. When mice were physically inactive, the AUCs for blood pressures were significantly lower in duanyu1842K KI than in littermates. When physically active, blood pressures were significantly higher in duanyu1842K KI than in littermates. The heart rate followed a similar pattern. The AUC of physical activity was significantly increased in duanyu1842K KI mice when compared to littermates and the duanyu1842K KI mice spent significantly less time in an inactive state and significantly more time in active states. Comparison between duanyu1842K KI mice and unrelated wild type mice yielded similar results to the comparison between duanyu1842K KI mice and littermates. We conclude that duanyu1842K inhibition increases spontaneous locomotor activity, which has a significant effect on blood pressure. © 2019 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of The Physiological Society and the American Physiological Society.

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