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Transport Mechanisms for the Nutritional Supplement β-Hydroxy-β-Methylbutyrate (HMB) in Mammalian Cells.

Abstract：

PURPOSE:β-Hydroxy-β-methylbutyrate (HMB), a nutritional supplement, elicits anabolic activity in muscle. Here we investigated the mechanism of HMB uptake in muscle cells. METHODS:Murine muscle cells (C2C12) and human mammary epithelial cells (MCF7) were used for uptake. As HMB is a monocarboxylate, focus was on monocarboxylate transporters, monitoring interaction of HMB with H+-coupled lactate uptake, and influence of H+ directly on HMB uptake. Involvement of MCT1-4 was studied using selective inhibitors and gene silencing. Involvement of human Na+/monocarboxylate transporter SMCT1 was also assessed using Xenopus oocytes. RESULTS:H+-coupled lactate uptake was inhibited by HMB in both mammalian cells. HMB uptake was H+-coupled and inhibited by lactate. C2C12 cells expressed MCT1 and MCT4; MCF7 cells expressed MCT1-4; undifferentiated C2C12 cells expressed SMCT1. SMCT1 mediated Na+-coupled HMB transport. Inhibitors of MCT1/4, siRNA-mediated gene silencing, and expression pattern showed that MCT1-4 were responsible only for a small portion of HMB uptake in these cells. CONCLUSION:HMB uptake in C2C12 and MCF7 cells is primarily H+-coupled and inhibited by lactate, but MCT1-4 are only partly responsible for HMB uptake. SMCT1 also transports HMB, but in a Na+-coupled manner. Other, yet unidentified, transporters mediate the major portion of HMB uptake in C2C12 and MCF7 cells.

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Ogura J,Sato T,Higuchi K,Bhutia YD,Babu E,Masuda M,Miyauchi S,Rueda R,Pereira SL,Ganapathy V

doi

10.1007/s11095-019-2626-3

subject

Has Abstract

pub_date

2019-04-17 00:00:00

pages

84

issue

6

eissn

0724-8741

issn

1573-904X

pii

10.1007/s11095-019-2626-3

journal_volume

36

pub_type

杂志文章

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