Increase,miRNA levels leads to Decrease,SIRT1(sirtuin 1) levels

Not specific.

No specific pattern of response response relationship was observed.

In study by Jiang et al,  it was shown that miR‐204‐5p targeting SIRT1 regulates hepatocellular carcinoma progression. The results were noted within 48 hours during the experiment (Jiang et al., 2016).

p53-miR-34a–SIRT1 Signaling Pathway

0404 is a DNA-damaging substance that has no cytotoxic effects on human hepatocytes that aren't malignant. In an in vivo HepG2 HCC model, 0404 caused apoptosis and inhibited proliferation. P53 WT HepG2 cells, on the other hand, were more susceptible to 0404 than p53 mutant Huh7 cell lines (Xia et al.,2017). P53 influences the expression of several miRs. As a result, a large number of miRs target the 3′UTR region of the p53 mRNA. As a result, p53 and miRs could establish a feedback loop (Zhang et al., 2015). The miR-34 family has been identified as the most common p53-induced miRs and is commonly suppressed in diverse malignancies (Xiao et al.,2014, Lou et al.,2015). In HCC cells, miR-34a increased p53 transcription and acetylation while also inducing apoptosis. 0404 enhanced p53 and miR-34a expression, elevated acetylated p53, and downregulated SIRT1 protein expression in HepG2 but not Huh7 cell lines, inhibiting HCC growth (Xiao et al.,2014).

In HCC, the lncRNA metastasis associated lung adenocarcinoma transcript 1 (MALAT1) is highly expressed, promoting development and invasion. MALAT1 stimulates the formation of HCC CSCs by activating the mechanistic target of rapamycin (mTOR) signalling pathway (Malakar et al.,2017;Yuan et al 2016). MiR-204, in contrast to MALAT1, promotes apoptosis by activating p53 and suppressing Bcl-2, an anti-apoptotic protein (Ryan et al.,2012 ). Cancer stemness and EMT were also suppressed by miR-204, which increased chemosensitivity (Ryan et al.,2012 ;Sacconi et al.,2012). MALAT1 expression, on the other hand, was negatively linked with miR-204 levels. MALAT1 binds to miR-204 and inhibits its expression by binding directly to it (Hou et al., 2017). SIRT1 appears to play a key role in the interaction between MALAT1 and miR-204. SIRT1 is recognised to play a role in HCC EMT, migration, and invasion. MiR-204 specifically targets SIRT1 and silences it (Hou et al.,2017).

However, because SIRT1 and MALAT1 bind to the same miR-204 region, MALAT1 may compete with SIRT1 for miR204 binding, reducing miR-204-induced SIRT1 suppression. Overall, MALAT1 inhibited miR-204 activity, resulting in an elevation in SIRT1, which encouraged HCC migration and invasion (Hou et al., 2017). MALAT1 inhibition reduced the aggressiveness of HCC, making it a possible therapeutic target (Hou et al., 2017).