Cucurbitacin B Suppresses Hyperglycemia Associated with a High Sugar Diet and Promotes Sleep in Drosophila melanogaster
Jiun Sang 1,3, Subash Dhakal 1,3, and Youngseok Lee 1,2,*
1Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 02707, Korea, 2Interdisciplinary Program for Bio-Health Convergence, Kookmin University, Seoul 02707, Korea, 3These authors contributed equally to this work.
Received December 9, 2020; Revised January 13, 2021; Accepted January 19, 2021.; Published online February 5, 2021.
© Korean Society for Molecular and Cellular Biology. All rights reserved.

ABSTRACT
Secondary metabolites enable plants to protect themselves from herbivorous insects. Among these, cucurbitacin B (cuc-B) is a bitter-tasting compound with promising pharmacological potential. Dietary exposure to cuc-B lowered the hemolymph glucose levels of Drosophila melanogaster fed with a high carbohydrate diet, which is homologous to high blood glucose in humans, and its effect was comparable to that of metformin, a well-known glucose-lowering drug. Furthermore, cuc-B reduced tissue sugar levels and glycogen levels, as well as triacylglycerol levels. Our results thus highlight the potential applicability of this compound to treat chronic metabolic diseases such as diabetes and obesity. Additionally, we analyzed sleep quality and taste-associative memory enhancement after cuc-B and metformin treatment. Both supplements increased nighttime bout length and metformin increased memory consolidation. Therefore, discarded shell of Cucurbitaceae could be processed into health supplements.
Keywords: cucurbitacin B, hypoglycemia, memory, metformin, sleep
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