An in vitro hepatic zonation model with a continuous oxygen gradient in a microdevice

Asako Sato, Kanae Kadokura, Hideyuki Uchida, Kosuke Tsukada

研究成果: Article査読

27 被引用数 (Scopus)

抄録

In a hepatic lobule, different sets of metabolic enzymes are expressed in the periportal (PP) and pericentral (PC) regions, forming a functional zonation, and the oxygen gradient is considered a determinant of zone formation. It is desirable to reproduce lobular microenvironment in vitro, but incubation of primary hepatocytes in conventional culture dishes has been limited at fixed oxygen concentrations due to technical difficulties. We designed a cell culture microdevice with an oxygen gradient to reproduce the hepatic microenvironment in vitro. The oxygen gradient during cell culture was monitored using a laser-assisted phosphorescence quenching method, and the cellular oxygen consumption rate could be estimated from changes in the gradient. Culture medium was continuously exchanged through microchannels installed in the device to maintain the oxygen gradient for a long term without transient hyper-oxygenation. The oxygen consumption rates of hepatocytes at 70.0 mmHg and 31.4 mmHg of partial oxygen pressure, which correspond to PP and PC regions in the microdevice, were 3.67 × 10-10 and 3.15 × 10-10 mol/s/106 cells, respectively. Antimycin A changed the oxygen gradient profile, indicating that cellular respiration can be estimated during cell culture. RT-PCR analysis of hepatocytes cultured under the oxygen gradient showed that mRNA expression of PEPCK and GK significantly increased in culture areas corresponding to PP and PC regions, respectively. These results indicate that the developed microdevice can reproduce the hepatic lobular microenvironment. The oxygen gradient in the microdevice can be closely controlled by changing the sizes of gas channels and the ambient oxygen concentration around the device; therefore, it could be expected to mimic the oxygen gradient of various organs, and it may be applicable to other pathological models.

本文言語English
ページ(範囲)767-771
ページ数5
ジャーナルBiochemical and Biophysical Research Communications
453
4
DOI
出版ステータスPublished - 2014 10月 31

ASJC Scopus subject areas

  • 生物理学
  • 生化学
  • 分子生物学
  • 細胞生物学

フィンガープリント

「An in vitro hepatic zonation model with a continuous oxygen gradient in a microdevice」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル