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1.
Clin Pharmacol Ther ; 106(5): 1056-1066, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31102467

RESUMO

Using positron emission tomography imaging, we determined the hepatic concentrations and hepatobiliary transport of [11 C]rosuvastatin (RSV; i.v. injection) in the absence (n = 6) and presence (n = 4 of 6) of cyclosporin A (CsA; i.v. infusion) following a therapeutic dose of unlabeled RSV (5 mg, p.o.) in healthy human volunteers. The sinusoidal uptake, sinusoidal efflux, and biliary efflux clearance (CL; mL/minute) of [11 C]RSV, estimated through compartment modeling were 1,205.6 ± 384.8, 16.2 ± 11.2, and 5.1 ± 1.8, respectively (n = 6). CsA (blood concentration: 2.77 ± 0.24 µM), an organic-anion-transporting polypeptide, Na+ -taurocholate cotransporting polypeptide, and breast cancer resistance protein inhibitor increased [11 C]RSV systemic blood exposure (45%; P < 0.05), reduced its biliary efflux CL (52%; P < 0.05) and hepatic uptake (25%; P > 0.05) but did not affect its distribution into the kidneys. CsA increased plasma concentrations of coproporphyrin I and III and total bilirubin by 297 ± 69%, 384 ± 102%, and 81 ± 39%, respectively (P < 0.05). These data can be used in the future to verify predictions of hepatic concentrations and hepatobiliary transport of RSV.

2.
J Immunol ; 180(1): 580-9, 2008 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-18097060

RESUMO

Binding of Ag-Ab immune complexes to cellular FcgammaR promotes cell activation, release of inflammatory mediators, and tissue destruction characteristic of autoimmune disease. To evaluate whether a soluble FcgammaR could block the proinflammatory effects of immune complexes, recombinant human (rh) versions of FcgammaRIA, FcgammaRIIA, and FcgammaRIIIA were prepared. Binding of rh-FcgammaRIA to IgG was of high affinity (KD=1.7x10(-10) M), whereas rh-FcgammaRIIA and rh-FcgammaRIIIA bound with low affinity (KD=0.6-1.9x10(-6) M). All rh-FcgammaR reduced immune complex precipitation, blocked complement-mediated lysis of Ab-sensitized RBC, and inhibited immune complex-mediated production of IL-6, IL-13, MCP-1, and TNF-alpha by cultured mast cells. Local or systemic delivery only of rh-FcgammaRIA, however, reduced edema and neutrophil infiltration in the cutaneous Arthus reaction in mice. 125I-labeled rh-FcgammaRIA was cleared from mouse blood with a rapid distribution phase followed by a slow elimination phase with a t1/2gamma of approximately 130 h. The highest percentage of injected radioactivity accumulated in blood approximately liver approximately carcass>kidney. s.c. dosing of rh-FcgammaRIA resulted in lower serum levels of inflammatory cytokines and prevented paw swelling and joint damage in a murine model of collagen Ab-induced arthritis. These data demonstrate that rh-FcgammaRIA is an effective inhibitor of type III hypersensitivity.


Assuntos
Doenças do Complexo Imune/tratamento farmacológico , Receptores de IgG/uso terapêutico , Animais , Complexo Antígeno-Anticorpo/efeitos dos fármacos , Artrite Experimental/tratamento farmacológico , Artrite Experimental/patologia , Reação de Arthus/tratamento farmacológico , Reação de Arthus/patologia , Proteínas do Sistema Complemento/imunologia , Citocinas/antagonistas & inibidores , Citocinas/metabolismo , Humanos , Doenças do Complexo Imune/patologia , Imunoglobulina G/metabolismo , Mastócitos/imunologia , Camundongos , Receptores de IgG/biossíntese
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