RESUMO
Retinal pigment epithelium (RPE) was isolated from human donors with no known eye disease and normal-appearing fundi and was grown in culture. Population doubling times were measured for fifth passage RPE cells; the mean was 2.25 +/- 0.75 days and showed a correlation with the age of the donor. Metabolic studies were performed by perfusing the cells with 1-[13C]-D-glucose and monitoring the perfusate with magnetic resonance spectroscopy. Glucose uptake was 10.5 +/- 3.3 nmoles/min/mg protein. Lactate production from glucose was 20.0 +/- 5.00 nmoles/min/mg protein. The percentage of glucose through the hexose monophosphate shunt was 21 +/- 2%. Oxygen (O) consumption was measured at 20.1 +/- 4.1 nmoles O/min/mg endogenous and 14.5 +/- 4.8 nmoles O/min/mg with 10 mM glucose. These cells exhibit high rates of lactate production concomitantly with high oxygen consumptions and high flux through the hexose monophosphate shunt.
Assuntos
Glucose/metabolismo , Consumo de Oxigênio , Via de Pentose Fosfato/fisiologia , Epitélio Pigmentado Ocular/metabolismo , Divisão Celular/fisiologia , Células Cultivadas , Metabolismo Energético , Glicólise , Humanos , Lactatos/biossíntese , Ácido Láctico , Espectroscopia de Ressonância Magnética , Perfusão , Epitélio Pigmentado Ocular/crescimento & desenvolvimentoRESUMO
Ab initio molecular orbital calculations with the 3-21G basis set show the most stable dilithiopropene structure to be the di-pi lithium-bridged structure VI of 1,3-dilithiopropene. This structure is most simply regarded as an ion triplet of two lithium cations and a propenylidene dianion.