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Itani, Hana A; McMaster, William G; Saleh, Mohamed A; Nazarewicz, Rafal R; Mikolajczyk, Tomasz P; Kaszuba, Anna M; Konior, Anna; Prejbisz, Aleksander; Januszewicz, Andrzej; Norlander, Allison E; Chen, Wei; Bonami, Rachel H; Marshall, Andrew F; Poffenberger, Greg; Weyand, Cornelia M; Madhur, Meena S; Moore, Daniel J; Harrison, David G; Guzik, Tomasz J
Hypertension (Dallas, Tex. 1979), 2016-July, Letnik: 68, Številka: 1Journal Article
Emerging evidence supports an important role for T cells in the genesis of hypertension. Because this work has predominantly been performed in experimental animals, we sought to determine whether human T cells are activated in hypertension. We used a humanized mouse model in which the murine immune system is replaced by the human immune system. Angiotensin II increased systolic pressure to 162 versus 116 mm Hg for sham-treated animals. Flow cytometry of thoracic lymph nodes, thoracic aorta, and kidney revealed increased infiltration of human leukocytes (CD45) and T lymphocytes (CD3 and CD4) in response to angiotensin II infusion. Interestingly, there was also an increase in the memory T cells (CD3/CD45RO) in the aortas and lymph nodes. Prevention of hypertension using hydralazine and hydrochlorothiazide prevented the accumulation of T cells in these tissues. Studies of isolated human T cells and monocytes indicated that angiotensin II had no direct effect on cytokine production by T cells or the ability of dendritic cells to drive T-cell proliferation. We also observed an increase in circulating interleukin-17A producing CD4 T cells and both CD4 and CD8 T cells that produce interferon-γ in hypertensive compared with normotensive humans. Thus, human T cells become activated and invade critical end-organ tissues in response to hypertension in a humanized mouse model. This response likely reflects the hypertensive milieu encountered in vivo and is not a direct effect of the hormone angiotensin II.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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