Polyhydroxyalkanoates (PHAs) are bacterial polyeste ars used in the production of biodegradable plastics. PHAs accumulate in bacterial cells under nutrient-limited conditions in response to excess carbon . The thiopurine drugs, including azathioprine, 6-mercaptopurine (6-MP) and 6-thioguanine (6-TG), are purinergic antimetabolite agents with profound antiproliferative effects. Azathioprine is converted into 6-MP, whose enzymatically driven metabolites 6-thioguanine nucleotides and 6-methylmercaptopurine interfere with RNA, DNA and protein synthesis as well as promote apoptosis of proliferating T cells. Numerous mechanisms are involved in the antiproliferative effects of 6-MP, which include its incorporation into nucleic acids chains. In addition, recent evidence indicates that 6-MP inhibits the phosphatidylinositol 3 kinase (PI3K) / mammalian target of rapamycin (mTOR) signaling pathway, suggesting that these drugs might interfere with metabolic checkpoints and impact metabolic reprogramming in normal T cells and cancer. The possible role in cell metabolic reprogramming, 6-MP regulates the activity of members of the orphan nuclear receptor NR4A family, which acts as key transcriptional regulators of glucose and lipid metabolism.