RESUMO
Tangeretin and nobiletin are polymethoxylated flavonoids in citrus peel. Both tangeretin and nobiletin are bitter; however, their bitterness has not been evaluated using human bitter taste receptors (hTAS2Rs). We screened 25 kinds of hTAS2Rs and found that hTAS2R14 and hTAS2R46 received both compounds.
Assuntos
Flavonas/química , Flavonas/farmacologia , Receptores Acoplados a Proteínas G/metabolismo , Células HEK293 , HumanosRESUMO
We purified several hundred mgs of four major theaflavins (theaflavin, theaflavin-3-O-gallate, theaflavin-3'-O-gallate, and theaflavin-3,3'-O-digallate). Among the 25 hTAS2Rs expressed in HEK293T cells, hTAS2R39 and hTAS2R14 were activated by theaflavins. Both hTAS2R39 and hTAS2R14 responded to theaflavin-3'-O-gallate. In addition, hTAS2R39 was activated by theaflavin and theaflavin-3,3'-O-gallate, but not by theaflavin-3-O-gallate. In contrast, hTAS2R14 responded to theaflavin-3-O-gallate.
Assuntos
Biflavonoides/metabolismo , Biflavonoides/farmacologia , Catequina/metabolismo , Catequina/farmacologia , Receptores de Superfície Celular/metabolismo , Percepção Gustatória/efeitos dos fármacos , Cálcio/metabolismo , Células HEK293 , HumanosRESUMO
Tea catechins have strong bitterness and influence the taste of tea. Among the 25 human bitter-taste receptors (TAS2Rs), we found that hTAS2R14 responded to catechins, in addition to hTAS2R39, a known catechin receptor. Although hTAS2R14 responded to (-)-epicatechin gallate and (-)-epigallocatechin gallate, it did not respond to (-)-epicatechin and (-)-epigallocatechin.
