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1.
J Med Chem ; 65(5): 3786-3797, 2022 03 10.
Artigo em Inglês | MEDLINE | ID: mdl-35175768

RESUMO

Results from recently completed clinical studies suggest the dopamine D1 receptor positive allosteric modulator (PAM) mevidalen (1) could offer unique value for lewy body dementia (LBD) patients. In nonclinical assessments, 1 was mainly eliminated by CYP3A4-mediated metabolism, therefore at the risk of being a victim of drug-drug interactions (DDI) with CYP3A4 inhibitors and inducers. An effort was initiated to identify a new D1 PAM with an improved DDI risk profile. While attempts to introduce additional metabolic pathways mediated by other CYP isoforms failed to provide molecules with an acceptable profile, we discovered that the relative contribution of CYP-mediated oxidation and UGT-mediated conjugation could be tuned to reduce the CYP3A4-mediated victim DDI risk. We have identified LY3154885 (5), a D1 PAM that possesses similar in vitro and in vivo pharmacologic properties as 1, but is metabolized mainly by UGT, predicting it could potentially offer lower victim DDI risk in clinic.


Assuntos
Citocromo P-450 CYP3A , Fármacos Neuroprotetores , Receptores de Dopamina D1/antagonistas & inibidores , Regulação Alostérica , Citocromo P-450 CYP3A/metabolismo , Inibidores do Citocromo P-450 CYP3A , Interações Medicamentosas , Humanos , Receptores de Dopamina D1/metabolismo
2.
J Chem Neuroanat ; 40(1): 63-70, 2010 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-20347961

RESUMO

Although the M(1) muscarinic receptor is a potential therapeutic target for Alzheimer's disease (AD) based on its wide spread distribution in brain and its association with learning and memory processes, whether its receptor response is altered during the onset of AD remains unclear. A novel [(35)S]GTPgammaS binding/immunocapture assay was employed to evaluated changes in M(1) receptor function in cortical tissue samples harvested from people who had no cognitive impairment (NCI), mild cognitive impairment (MCI), or AD. M(1) function was stable across clinical groups. However, [(3)H]-oxotremorine-M radioligand binding studies revealed that the concentration of M(1) cortical receptors increased significantly between the NCI and AD groups. Although M(1) receptor function did not correlate with cognitive function based upon mini-mental status examination (MMSE) or global cognitive score (GCS), functional activity was negatively correlated with the severity of neuropathology determined by Braak staging and NIA-Reagan criteria for AD. Since M(1) agonists have the potential to modify the pathologic hallmarks of AD, as well as deficits in cognitive function in animal models of this disease, the present findings provide additional support for targeting the M(1) receptor as a potential therapeutic for AD.


Assuntos
Acetilcolina/metabolismo , Doença de Alzheimer/metabolismo , Córtex Cerebral/metabolismo , Receptor Muscarínico M1/metabolismo , Idoso , Idoso de 80 Anos ou mais , Doença de Alzheimer/tratamento farmacológico , Doença de Alzheimer/fisiopatologia , Ligação Competitiva/fisiologia , Biomarcadores/análise , Biomarcadores/metabolismo , Córtex Cerebral/patologia , Córtex Cerebral/fisiopatologia , Transtornos Cognitivos/tratamento farmacológico , Transtornos Cognitivos/metabolismo , Transtornos Cognitivos/fisiopatologia , Feminino , Guanosina 5'-O-(3-Tiotrifosfato)/metabolismo , Humanos , Imunoensaio/métodos , Masculino , Agonistas Muscarínicos/farmacologia , Agonistas Muscarínicos/uso terapêutico , Testes Neuropsicológicos , Oxotremorina/metabolismo , Valor Preditivo dos Testes , Ensaio Radioligante/métodos , Receptor Muscarínico M1/análise , Radioisótopos de Enxofre/metabolismo , Regulação para Cima/fisiologia
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