Mahmoud, A. D. | bioRxiv Science

bioRxiv2022

LKB1 is the gatekeeper of carotid body chemo-sensing and the hypoxic ventilatory response

The hypoxic ventilatory response (HVR) is critical to breathing and thus oxygen supply to the body and is primarily mediated by the carotid bodies. Here we reveal that carotid body afferent discharge during hypoxia and hypercapnia is determined by the expression of Liver Kinase B1 (LKB1), the principal kinase that activates the AMP-activated protein kinase (AMPK) during metabolic stresses. Conversely, conditional deletion in catecholaminergic cells of AMPK had no effect on carotid body responses to hypoxia or hypercapnia. By contrast, the HVR was attenuated by LKB1 and AMPK deletion. However, in LKB1 knockouts hypoxia evoked hypoventilation, apnoea and Cheyne-Stokes-like breathing, while only hypoventilation and apnoea were observed after AMPK deletion. We therefore identify LKB1 as an essential regulator of carotid body chemosensing and uncover a divergence in dependency on LKB1 and AMPK between the carotid body on one hand and the HVR on the other.

physiology↗

bioRxiv2019

The hypoxic ventilatory response is facilitated by the activation of Lkb1-AMPK signalling pathways downstream of the carotid bodies

We recently demonstrated that the role of the AMP-activated protein kinase (AMPK), a ubiquitously expressed enzyme that governs cell-autonomous metabolic homeostasis, has been extended to system-level control of breathing and thus oxygen and energy (ATP) supply to the body. Here we assess the contribution to the hypoxic ventilatory response (HVR) of two upstream kinases that govern the activities of AMPK. Lkb1, which activates AMPK in response to metabolic stress and CaMKK2 which mediates the alternative Ca2+-dependent mechanism of AMPK activation. HVRs remained unaffected in mice with global deletion of the CaMKK2 gene. By contrast, HVRs were markedly attenuated in mice with conditional deletion of LKB1 in catecholaminergic cells, including carotid body type I cells and brainstem respiratory networks. In these mice hypoxia evoked hypoventilation, apnoea and Cheyne-Stokes-like breathing, rather than hyperventilation. Attenuation of HVRs, albeit less severe, was also conferred in mice carrying [~]90% knockdown of Lkb1 expression. Carotid body afferent input responses were retained following either [~]90% knockdown of Lkb1 or AMPK deletion. In marked contrast, LKB1 deletion virtually abolished carotid body afferent discharge during normoxia, hypoxia and hypercapnia. We conclude that Lkb1 and AMPK, but not CaMKK2, facilitate HVRs at a site downstream of the carotid bodies.

physiology↗