PMID- 34209599 OWN - NLM STAT- MEDLINE DCOM- 20210727 LR - 20211204 IS - 2072-6643 (Electronic) IS - 2072-6643 (Linking) VI - 13 IP - 7 DP - 2021 Jun 29 TI - Amino Acid-Induced Impairment of Insulin Signaling and Involvement of G-Protein Coupling Receptor. LID - 10.3390/nu13072229 [doi] LID - 2229 AB - Amino acids are needed for general bodily function and well-being. Despite their importance, augmentation in their serum concentration is closely related to metabolic disorder, insulin resistance (IR), or worse, diabetes mellitus. Essential amino acids such as the branched-chain amino acids (BCAAs) have been heavily studied as a plausible biomarker or even a cause of IR. Although there is a long list of benefits, in subjects with abnormal amino acids profiles, some amino acids are correlated with a higher risk of IR. Metabolic dysfunction, upregulation of the mammalian target of the rapamycin (mTOR) pathway, the gut microbiome, 3-hydroxyisobutyrate, inflammation, and the collusion of G-protein coupled receptors (GPCRs) are among the indicators and causes of metabolic disorders generating from amino acids that contribute to IR and the onset of type 2 diabetes mellitus (T2DM). This review summarizes the current understanding of the true involvement of amino acids with IR. Additionally, the involvement of GPCRs in IR will be further discussed in this review. FAU - Zakaria, Nur Fatini AU - Zakaria NF AUID- ORCID: 0000-0002-0755-6058 AD - Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia. FAU - Hamid, Muhajir AU - Hamid M AD - Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia. FAU - Khayat, Mohd Ezuan AU - Khayat ME AUID- ORCID: 0000-0002-4876-6385 AD - Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia. LA - eng GR - 5540181/Fundamental Research Grant Scheme Malaysia/ PT - Journal Article PT - Review DEP - 20210629 PL - Switzerland TA - Nutrients JT - Nutrients JID - 101521595 RN - 0 (Amino Acids) RN - 0 (Receptors, G-Protein-Coupled) RN - EC 2.7.1.1 (MTOR protein, human) RN - EC 2.7.11.1 (TOR Serine-Threonine Kinases) SB - IM MH - Amino Acids/*metabolism MH - Diabetes Mellitus, Type 2/blood MH - Gastrointestinal Microbiome MH - Humans MH - Insulin Resistance/*physiology MH - Metabolic Diseases/blood MH - Receptors, G-Protein-Coupled/*metabolism MH - Signal Transduction/*physiology MH - TOR Serine-Threonine Kinases/*metabolism MH - Up-Regulation PMC - PMC8308393 OTO - NOTNLM OT - G-protein coupled receptor (GPCRs) OT - branched-chain amino acid (BCAAs) OT - gut microbiome OT - inflammation OT - insulin resistance (IR) OT - mammalian target of rapamycin (mTOR) OT - metabolic dysfunction OT - type 2 diabetes mellitus (T2DM) COIS- The authors declare no conflict of interest. EDAT- 2021/07/03 06:00 MHDA- 2021/07/28 06:00 PMCR- 2021/06/29 CRDT- 2021/07/02 01:39 PHST- 2021/05/20 00:00 [received] PHST- 2021/06/18 00:00 [revised] PHST- 2021/06/24 00:00 [accepted] PHST- 2021/07/02 01:39 [entrez] PHST- 2021/07/03 06:00 [pubmed] PHST- 2021/07/28 06:00 [medline] PHST- 2021/06/29 00:00 [pmc-release] AID - nu13072229 [pii] AID - nutrients-13-02229 [pii] AID - 10.3390/nu13072229 [doi] PST - epublish SO - Nutrients. 2021 Jun 29;13(7):2229. doi: 10.3390/nu13072229.