[Long non-coding RNA growth arrest specific transcript 5 (lncGAS5) promotes autophagy of hepatocytes induced by homocysteine].

Objective To study the role of long non-coding RNA growth arrest specific transcript 5 (lncGAS5) in the autophagy of hepatocytes induced by homocysteine (Hcy). Methods HL7702 human hepatocyte cells were cultured in vitro and divided into control group and Hcy group. Western blotting was used to detect the expression levels of microtubule-associated protein 1 light chain 3B (LC3B) and P62. The cells were transfected with mRFP-GFP-LC3 adenovirus to observe the autophagy flow with laser scanning confocal microscope. Real-time quantitative PCR was performed to detect the expression level of lncGAS5. lncGAS5 small interfering RNA (si-lncGAS5) and negative control small interfering RNA (si-NC) were transfected into the cells. After the transfected cells were treated with Hcy, the changes of LC3B, P62 and autophagy flow were analyzed with the above methods. Results Compared with the control group, the LC3BII/LC3BI ratio increased and the expression of P62 protein decreased in the Hcy group. When the lever of Hcy lifted, the number of autophagosomes and autolysosomes and the expression of lncGAS5 increased in the cells. After knock-down of lncGAS5, the ratio of LC3BII/LC3BI decreased and the expression of P62 increased. Moreover, the number of autophagosomes and autolysosomes were reduced in the cells. Conclusion lncGAS5 can promote the autophagy of hepatocytes induced by Hcy.