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Oliveira KAD, Araújo HN, Lima TID, Oliveira AG, Favero-Santos BC, Guimarães DSP, Freitas PAD, Neves RDJD, Vasconcelos RP, Almeida MGGD, Ramos MV, Silveira LR, Oliveira ACD. Phytomodulatory proteins isolated from Calotropis procera latex promote glycemic control by improving hepatic mitochondrial function in HepG2 cells. Saudi Pharm J 2021; 29:1061-1069. [PMID: 34588851 PMCID: PMC8463474 DOI: 10.1016/j.jsps.2021.07.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 07/04/2021] [Indexed: 12/03/2022] Open
Abstract
The medicinal uses of Calotropis procera are diverse, yet some of them are based on effects that still lack scientific support. Control of diabetes is one of them. Recently, latex proteins from C. procera latex (LP) have been shown to promote in vivo glycemic control by the inhibition of hepatic glucose production via AMP-activated protein kinase (AMPK). Glycemic control has been attributed to an isolated fraction of LP (CpPII), which is composed of cysteine peptidases (95%) and osmotin (5%) isoforms. Those proteins are extensively characterized in terms of chemistry, biochemistry and structural aspects. Furthermore, we evaluated some aspects of the mitochondrial function and cellular mechanisms involved in CpPII activity. The effect of CpPII on glycemic control was evaluated in fasting mice by glycemic curve and glucose and pyruvate tolerance tests. HepG2 cells was treated with CpPII, and cell viability, oxygen consumption, PPAR activity, production of lactate and reactive oxygen species, mitochondrial density and protein and gene expression were analyzed. CpPII reduced fasting glycemia, improved glucose tolerance and inhibited hepatic glucose production in control animals. Additionally, CpPII increased the consumption of ATP-linked oxygen and mitochondrial uncoupling, reduced lactate concentration, increased protein expression of mitochondrial complexes I, III and V, and activity of peroxisome-proliferator-responsive elements (PPRE), reduced the presence of reactive oxygen species (ROS) and increased mitochondrial density in HepG2 cells by activation of AMPK/PPAR. Our findings strongly support the medicinal use of the plant and suggest that CpPII is a potential therapy for prevention and/or treatment of type-2 diabetes. A common epitope sequence shared among the proteases and osmotin is possibly the responsible for the beneficial effects of CpPII.
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Key Words
- AMPK, AMP-activated kinase protein
- AUC, Area under the curve
- Bioactive proteins
- CTL, Control
- Calotropis procera
- CpPII, Major peptidase fraction treated with iodoacetamide
- DHE, Dihydroethidium
- DMEM, Dulbecco’s minimal essential medium
- DMSO, Dimethyl sulfoxide
- FCCP, Oligomycin carbonyl cyanide 4 (trifluoromethoxy) phenylhydrazine
- Folk medicine
- Glycemia
- HGP, Hepatic glucose production
- LP, Soluble latex proteins from Calotropis procera
- Latex
- MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- OCR, Oxygen consumption rate
- OXPHOS, Oxidative phosphorylation
- PPAR, Peroxisome proliferator-activated receptor
- PPRE, PPAR response element
- ROS, Reactive oxygen species
- TBS-T, Tris buffered saline solution containing 0.1% Tween 20
- UCP2, Mitochondrial uncoupling protein 2
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | - Ariclecio Cunha de Oliveira
- Superior Institute of Biomedical Sciences, State University of Ceara, Fortaleza, Brazil
- Corresponding author.at: Superior Institute of Biomedical Sciences, State University of Ceara, Fortaleza, Ceara, Brazil.
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Qin L, Guimarães DSP, Melesse M, Hall MC. Substrate recognition by the Cdh1 destruction box receptor is a general requirement for APC/CCdh1-mediated proteolysis. J Biol Chem 2017; 292:5125-5127. [DOI: 10.1074/jbc.a116.731190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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