A new world of calcium signaling in brain capillaries
Longden T, Mughal A, Hennig G, Harraz O, Shui B, Lee F, Lee J, Reining S, Kotlikoff M, Konig G, Kostenis E, Hill-Eubanks D, Nelson M (2021) “Local IP3 receptor-mediated Ca2+ signals compound to direct blood flow in brain capillaries”.
Science Advances. 7: eabh0101
This paper reveals that the capillaries in just 1 cubic millimeter of cortex engage in a staggering 5,000 calcium events per second. These events are key to precisely tuning blood flow through the capillary network branch-by-branch. We determine the molecular basis of these signals and examine the mechanisms through which they exert control over blood flow
A map of pericyte ion channels and GPCRs
Hariharan A, Weir N, Robertson C, He L, Betsholtz C, Longden T (2020) "The Ion Channel and GPCR Toolkit of Brain Capillary Pericytes."
Frontiers in Cellular Neuroscience 14:601324. doi: 10.3389/fncel.2020.601324
In collaboration with the Betsholtz group at Uppsala University, this paper systematically explores the ion channels and G protein coupled receptors that are expressed at the mRNA level by brain capillary pericytes, and examines what is currently known of their function, with the aim of providing a roadmap to guide further studies of brain pericyte functions and contributions to blood flow control. In particular, we put forth a model for how pericyte KATP channels may play an critical role in controlling brain blood flow.
Garcia D, Longden T (2020) “Ion channels and Ca2+ signaling in the capillary endothelium.” Current Topics in Membranes, 85: 261-300.
Cleary C, Moreira T, Takakura A, Nelson M, Longden T, Mulkey D. (2020) “Vascular control of the CO2/H+-dependent drive to breathe in mice.”eLife, 9: e59499.
Mughal A, Sackheim A, Sancho M, Longden T, Russell S, Lockette W, Nelson M, Freeman K. (2020) “Impaired capillary-to-arteriolar electrical signaling after traumatic brain injury.” Journal of Cerebral Blood Flow & Metabolism. In press.
Moshkforoush A, Ashenagar B, Harraz O, Dabertrand F, Longden T, Nelson M, Tsoukias N. (2020) "Capillary Kir channel as sensor and amplifier of neuronal signals: modeling insights on K+-mediated neurovascular communication." Proceedings of the National Academy of Sciences USA. In press.
Harraz O, Longden T, Hill-Eubanks D, Nelson M (2018) "PIP2 depletion promotes TRPV4 channel activity in mouse brain capillary endothelial cells" eLife. 7: e38689.
Harraz O, Longden T, Dabertrand F, Hill-Eubanks D, Nelson M (2018) "Endothelial GqPCR activity controls capillary electrical signaling and brain blood flow through PIP2 depletion"Proceedings of the National Academy of Sciences USA. 115: E3569-E3577.
Tykocki N, Bonev A, Longden T, Heppner T, Nelson M (2017) “Inhibition of vascular smooth muscle inward-rectifier K+ channels restores myogenic tone in mouse urinary bladder arterioles” American Journal of Physiology Renal Physiology, 312(5):F836-F847.
Longden T, Hill-Eubanks D, Nelson M (2016) “Ion Channel Networks in the Control of Cerebral Blood Flow” Journal of Cerebral Blood Flow & Metabolism, 36(3):492-512.
Klitgaard-Povlsen G, Longden T, Bonev A, Hill-Eubanks D, Nelson M (2016) “Uncoupling of Neurovascular Communication After Transient Global Cerebral Ischemia is Caused by Impaired Parenchymal Smooth Muscle KIRChannel Function” Journal of Cerebral Blood Flow & Metabolism, 36(7):1195-1201.
Longden T, Nelson M (2015) “Vascular Inward Rectifier K+ Channels as External K+ Sensors in the Control of Cerebral Blood Flow.” Microcirculation, 22(3): 183-196.
Balbi M, Ghosh M, Longden T, Vega M, Gesierich B, Hellal F, Lourbopoulos A, Nelson M, Plesnila N (2015) “Dysfunction of mouse cerebral arteries during early aging” Journal of Cerebral Blood Flow & Metabolism35(9): 1445-1453.
Villalba N, Sonkusare S, Longden T, Tran T, Sackheim A, Nelson M, Wellman G, Freeman K (2014) “Traumatic brain injury disrupts cerebrovascular tone through endothelial inducible nitric oxide synthase expression and nitric oxide gain of function.” Journal of the American Heart Association, 3(6): e001474.
Longden T, Dabertrand F, Hill-Eubanks D, Hammack S, Nelson M (2014) “Stress-Induced Glucocorticoid Signaling Remodels Neurovascular Coupling Through Impairment of Cerebrovascular Inwardly Rectifying K+Channel Function.” Proceedings of the National Academy of Sciences USA, 111(20): 7462-7.
Longden T, Dunn K, Draheim H, Nelson M, Weston A, Edwards G (2011) “Intermediate-Conductance Calcium-Activated Potassium Channels Participate in Neurovascular Coupling.” British Journal of Pharmacology, 164(3): 922-33.