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Beni-Suef University Journal of Basic and Applied Sciences
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Combination of decaffeinated green coffee and decaffeinated green tea ameliorates cardiomyopathy through cardiotrophin-1-dependent expression regulation in a metabolic syndrome rat model: a proposed mechanism

Beni-Suef University Journal of Basic and Applied Sciences volume 12, Article number: 53 (2023) Cite this article

Abstract

Background

Cardiovascular diseases (CVD) are the primary medical manifestation of metabolic syndrome (MetS). Hypoxia is also involved in the pathogenesis of CVD. Since dietary intervention significantly improved the physiological condition in MetS, the development of functional food to complement conventional medical therapy is essential. Among several standard consumable products, decaffeinated green tea (DGT) and decaffeinated green coffee (DGC) have excellent activity in managing MetS-induced CVD. However, the mechanism underlying their protective activity is poorly understood. This study aimed to understand the cardio-protective activity of DGT, DGC, and a combination of the two (DGT + DGC) in managing MetS-induced CVD in vivo and in silico.

Results

The MetS condition led to the upregulation of Cardiotrophin-1 (CT-1), Signal Transducer and Activator of Transcription 3 (STAT3), GATA binding protein 4 (GATA4), and B-type Natriuretic Peptide (BNP) beyond the levels of the normal (N) group, while administration of DGT, DGC, and DGT + DGC significantly decreased the expression of those genes compared with the levels of the N group (p < 0.05). The computational analysis showed that the protective role of DGT, DGC, and DGT + DGC might be achieved through AKT1 inhibition by several bioactive components present in DGT and DGC. The analysis also defined the improvement in cardio-protective activity by combining DGT and DGC.

Conclusions

The administration of DGT, DGC, or DGT + DGC repaired cardiac dysfunction parameters through indirect regulation of the CT-1 signaling axis by inhibiting AKT1 activity.

1 Background

Changes in lifestyle, nutrition, and social environments in modern society positively correlate with the global escalation of the prevalence obesity, insulin resistance (IR), diabetes, dyslipidemia, and hypertension [1]. The occurrence of those abnormalities is generally known as metabolic syndrome (MetS) [1]. Additionally, development of cardiovascular disease (CVD) in individuals with MetS indicates a poor prognoses compared to the individual without it [2]. The combination among several aforementioned features of MetS increases the risk and severity of a broad spectrum of CVD [3].

Dysregulation of metabolic activity associated with glucose and lipid metabolism is the primary causative agent in the development of MetS. A recent study revealed the overexpression of cardiotrophin-1 (CT-1) to be linked to MetS-induced CVD [4, 5]. CT-1 belongs to the interleukin-6 (IL-6) cytokine family that has a crucial role in glucose and lipid metabolism, obesity, IR pathogenesis, and, importantly, cardiomyopathy pathogenesis [4, 6, 7]. CT-1 induces signal transduction via the membrane glycoprotein 130 (gp130) receptor system [8]. Activation of gp130 induces the expression of the signal transducer and activator of transcription 3 (STAT3) [9]. Then, STAT3 expression upregulates the transcription factor GATA4 [10] and leads to the transcription of the B-type natriuretic peptide (BNP) gene [11]. Interestingly, the dysregulated level of BNP in the serum was an independent predictor for CVD mortality and might serve as a target for medium to long-term preventive therapies [12]. Thus, the inter-dependent pathway of those genes provides an opportunity to regulate MetS-induced CVD pathophysiology.

Lifestyle modification, particularly dietary intervention, plays a significant role in physiological improvement under MetS conditions beyond conventional medical therapy [13]. Among several available natural products, Decaffeinated Green Tea (DGT) and Decaffeinated Green Coffee (DGC) have the potential bioactivity in maintaining physiological homeostasis. DGT and DGC have been shown to individually improve the physiological balance in MetS conditions and display cardio-protective effects [14,15,16]. In addition, a combination of DGT + DGC was also reported to have physiological benefits by ameliorating MetS through regulating lipid and glucose metabolism, IR, and inflammation [17,18,19,20]. Although the cardio-protective effect of the DGT + DGC administration has been elucidated [19, 21], the biomechanism underlying it remains unknown. Therefore, this study will explore the protective effect of DGT, DGC, and DGT + DGC against cardiomyopathy in vivo and in silico.

2 Methods

2.1 Extraction of DGC and DGT

The DGC and DGT were extracted according to the protocol described by Rohman et al. [17]. The coffee bean was obtained from the Dampit coffee plantation in Malang, Indonesia (800 MAMSL). Coffea canephora var. robusta was light roasted on an automatic coffee roaster (N500i) at 180–200 °C until the first crack. Afterwards, the coffee bean was grinded using a coffee grinder and macerated with ethanol 95% to produce the crude extract. A filter cloth was used to separate the liquid phase from the solid phase of the crude extract. Finally, remaining solvent in the liquid phase was rotary evaporated at 40 °C (RV10 autoV, IKA). Column chromatography was performed using silica gel C18 17% (SiliaBond® C18, SiliCycle Inc) as a static phase to obtain the DGC. Then, the filtered product was evaporated.

The green tea was obtained from Sukawana green tea plantation, Bandung, Indonesia (1550 MAMSL). A total of 500 g of green tea leaf were dried in a cabinet dryer at 50 °C for eight hours to produce green tea with an 8–10% water content, which was then quantified using gravimetric analysis. The dried green tea leaves then grinded and boiled for 30 min at 80 °C. A filter cloth was applied to separate the liquid and solid phase of macerated green tea leaves. The liquid phase was then concentrated using a rotary evaporator at 40 °C. The column chromatography was used to obtain the bioactive compounds (SiliaBond® C18, SiliCycle Inc.), and the obtained yield was then evaporated to obtain the DGT.

2.2 Animal model

The animal model for MetS was developed according to a previously described method [18, 22]. Twenty-five male Sprague–Dawley rats aged 2–3 months old with an average weight of 250–300 g were randomly assigned into the following five groups: Normal (N), MetS, DGC administration, DGT administration, and DGT + DGC administration (n = 5 per group). MetS rats were fed a high-fat and high-sucrose (HFHS) diet for eight weeks with the injection of STZ (30 mg/Kg BW) intraperitoneally in the second week during the HFHS feeding, while the N rats were fed a regular diet. The DGC group was orally administered a single GC extract at a dose of 200 mg/Kg BW, the DGT group with a single DGT extract at a dose of 300 mg/Kg BW, and the DGC + DGT group with DGC + DGT extract at a dose of 200 and 300 mg/Kg BW, respectively. All treatments were given orally using a feeding tube every afternoon (03.00–05.00 PM) for nine weeks. At the end of the treatment, the rats were euthanized with diethyl ether, and the hearts were harvested and preserved in an RNA buffer solution to keep RNA integrity.

2.3 RNA isolation, cDNA transcription, and cDNA amplification

According to the manufacturer's instructions, RNA was isolated from cardiac tissue using the TRIzol® reagent (Intron Biotechnology, South Korea). RNA was reverse transcribed into cDNA using a ReverTra Ace-α Kit (Ref FSK-101, Toyobo, Japan). The relative expression of CT-1, STAT3, BNP, and GATA4 was analyzed through touchdown PCR amplification using a LightCycler 96 system (Takara, Japan). β-actin (Actb) was selected as the standard expression measurement for each gene. The primer sequences for each analyzed gene are described in Table 1. The amplification program was set as follows: 94 °C for 10 s, 57 °C for 30 s, 55 °C for 60 s, and 52 °C for 10 min. The PCR program was run for 36 cycles. Agarose gel electrophoresis was performed to analyze the amplified cDNA. The density of the visualized bands was then quantified using ImageJ software to determine the relative expression of the target genes.

Table 1 The primer sequence for each target gene in this study
Full size table

2.4 Data analysis

The expression of each target gene was calculated relative to β-actin’s expression. The data were then statistically analyzed using one-way ANOVA and Duncan’s post hoc test. The data were determined as significantly different if p < 0.05.

2.5 Compound and protein structure retrieval

The compounds’ three-dimensional (3D) structures were downloaded from the PubChem database. Cafestol, chlorogenic acid, citric acid, kahweol, quinic acid, and trigonelline were selected as the bioactive compounds from DGC [23], and epicatechin (EC), epicatechin gallate (ECG), epigallocatechin (EGC), and epigallocatechin gallate (EGCG) were determined as the main bioactive compounds of DGT [24]. Meanwhile, the 3D structure of proteins was retrieved from the RCSB protein data bank (PDB) with the following PDB identity (ID): AKT1 (3O96) and HIF-1ɑ (4H6J). Before the docking process, the protein structures were prepared by deleting the water molecules, unwanted protein chains, and pre-attached ligands.

2.6 Molecular docking

AutoDock Vina [25] was employed for the docking process in the PyRx 0.8 user interface [26]. The compounds’ structures were inserted, their energy minimized, and converted to AutoDock Vina’s ligand through the OpenBabel plugin [27]. The proteins, as well as the macromolecules, were set as rigid entities, while the ligands were set as flexible molecules. As per previous studies, the docking was specified at the inhibitor-binding site of HIF-1ɑ and AKT1 [28, 29]. The binding pose from the compound with a binding affinity lower than − 7.0 kcal/mol was selected for residues-ligand interaction using the Biovia Discovery Studio 2019 and molecular dynamics analysis [30, 31].

2.7 Molecular dynamics

Molecular dynamics was analyzed using the YASARA 20.12.24 program [32] under the AMBER14 forcefield [33]. The environment setting for the simulations was as follows: 310 K for temperature, 1 bar for pressure, 0.997 for water density, 0.9% for NaCl concentration, pH 7.4, and cubic simulation box. The structural flexibility and integrity were analyzed using the root-mean-square deviation (RMSD) of the atomic positions and the root-mean-square fluctuations (RMSF) of the residue positions. The free-binding energy was also calculated using molecular mechanics Poisson–Boltzmann surface area equations [34] in YASARA binding energy macros.

3 Results

3.1 Effect of DGC , DGT, and DGC + DGT Administration on CT-1 , STAT3 , BNP, and GATA4

The MetS group consistently displayed a higher expression of all experimental parameters, i.e., CT-1, STAT3, BNP, and GATA4, compared with the N group. The administration of DGT or DGC alone significantly decreased the expression of CT-1, and the combination of the two extracts rescued the expression to the levels of the N group (Fig. 1A). The same event was observed for STAT3 expression, where the administration of DGT, DGC, and DGT + DGC rescued the condition by suppressing the expression as well as the normal condition (Fig. 1B). The protective effect of the treatment was also shown by the alleviation of BNP expression compared with that in the MetS group (p < 0.05). Interestingly, the administration of DGT alone was statistically similar to that in the N group (Fig. 1C). Furthermore, downregulation of GATA4 was also observed in all treated groups, with the DGC + DGT group performing better to overwhelm the expression of GATA4 as the N group than DGT or DGC alone (Fig. 1D). In summary, the administration of DGT, DGC, or DGT + DGC markedly decreased the expression of the selected parameters below the MetS group.

Fig. 1
figure 1

The expression of CT-1 (A), STAT3 (B), BNP (C), and GATA4 (D) in each treatment group. Different notation describes a significant difference according to Duncan post-hoc test

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3.2 Interaction of compounds in DGT and DGC with HIF-1ɑ and AKT1

The compounds from DGT and DGC have a greater affinity for AKT1 than for HIF-1ɑ. Cafestol achieved the lowest binding energy to HIF-1ɑ, whereas ECG posed a minor energy requirement to bind to AKT1. Furthermore, not all analyzed compounds showed a low binding energy with AKT1. Only cafestol, chlorogenic acid, kahweol, EC, ECG, EGC, and EGCG showed small binding energy (lower than − 7.0 kcal/mol) to AKT1. In addition, cafestol, ECG, and EGCG displayed similar binding energies with the Inhibitor-8, a known inhibitor of AKT1 (Table 2). Therefore, the compounds with binding energy smaller than − 7.0 kcal/mol were used for residue binding analysis.

Table 2 The binding energy of compounds from GT and GC from the molecular docking analysis
Full size table

Compounds with low binding energy exhibited a more significant number of hydrogen and hydrophobic bonds. From the residues-binding point of view, cafestol had the most similar bounded residues with the Inhibitor-8. However, cafestol had fewer hydrogen bonds than chlorogenic acid, EC, ECG, and EGCG. As displayed by the binding energy value, Inhibitor-8 had a more complex binding interaction with several hydrogen bonds, hydrophobic bonds, and van der Waals interaction. EC and EGCG was the compound with the more number of hydrogen bonds (Fig. 2). Those compounds were then directed for molecular dynamics simulation to assess the structural and interaction stability in the physiological milieu.

Fig. 2
figure 2

The residues and interaction chemistry that involved in the protein–ligand binding of selected compounds from GT and GC with AKT1

Full size image

The value of the RMSD atom backbone described that kahweol affected the structural integrity of AKT1, depicted by the high fluctuation of the RMSD value. Other compounds did not affect the structural integrity of AKT1’s structure, although several compounds showed some escalation at the end of the simulation, such as chlorogenic acid and EGC (Fig. 3A). The compounds’ structure was also stable during the simulation, even though chlorogenic acid displayed the highest RMSD value (Fig. 3B). Furthermore, the RMSD of ligand movement also visualized a stable interaction between the compounds and the AKT1 structure. Kahweol and EC showed similar stability to Inhibitor-8 (Fig. 3C). This observation was also supported by the number of hydrogen bonds in the complexes, which had a similar event without any significant difference (Fig. 3D). However, the RMSF value described the instability of some residues of AKT1, including VAL45, GLN113, ARG200, GLU298, and VAL429. Those instabilities mostly occurred by chlorogenic acid binding to the AKT1 (Fig. 3E). Nevertheless, those instabilities may not affect the interaction of the compounds with the AKT1 according to the free-binding energy calculation. No apparent difference was observed among the simulated complexes, and each complex showed stable binding without any differences in their binding energy (Fig. 3F).

Fig. 3
figure 3

The structural dynamics of protein, ligand, and the interaction among them. The RMSD of atom backbone (A), the RMSD of ligand structure (B), the RMSD of ligand movement (C), the average number of hydrogen bond (D), the RMSF of each residue of AKT1 (E), and the free-binding energy of each complex (F)

Full size image

4 Discussion

CVD has become a common medical manifestation of MetS. Several biomarkers have been discovered to detect cardiac dysfunction, and BNP has become an accurate predictor [35]. Increased level of BNP provides a robust prediction of cardiac dysfunction [36, 37]. This study confirmed that event where the MetS group had higher BNP levels than the N group. Fortunately, the administration of DGC, DGT, and a combination of the two could restore the expression of BNP near the N condition (Fig. 1C). Thus, the DGT + DGC could contribute to cardio-protective effect under MetS conditions.

Since the transcription factor GATA4 regulates BNP expression [11], this study also measured its expression. In line with the BNP result, MetS increased the expression of GATA4, and the administration of DGT, DGC, particularly DGT + DGC, downregulated GATA4’s expression (Fig. 1D). Therefore, the GATA4 expression regulator was also measured to comprehend the upstream target of the current treatment. Previously, GATA4 expression was upregulated by STAT3 expression. [10] Thus, STAT3 was also evaluated to confirm the regulatory mechanism of the treatment. During the GATA4 regulation, STAT3 is also repressed upon treatment as an N condition (Fig. 1B). CT-1 expression was also evaluated to better understand the modulatory mechanism of the treatment of the MetS condition, mainly related to CVD. As previously described, CT-1 activates the STAT3 upon binding to gp130. Thus, the upregulation of CT-1 expression may influence STAT3’s expression.

Interestingly, the results showed the same manner of lower expression of CT-1 in the N group than in MetS. The DGC and DGT treatment diminished CT-1 expression, with DGT + DGC administration performing better in reducing CT-1 expression in the N group (Fig. 1A). According to the data, the expression of BNP in MetS was CT-1-dependent. However, the downregulation of CT-1 post-treatment still needs further explanation to clearly define the cardio-protective effect DGT, DGC, and DGT + DGC.

A previous study demonstrated that the increasing level of CT-1 induced by hypoxic stress suggests the involvement of HIF-1ɑ in CVD events [38]. This condition was confirmed by a previous study that reported that HIF-1ɑ dependently regulated CT-1 expression at the transcriptional level [39]. Unfortunately, the computational analysis failed to define the cardio-protective activity through the HIF-1ɑ axis. All compounds from DGT and DGC failed to bind with HIF-1ɑ to perform their inhibitory activity (Table 2). Thus, another upstream target may be involved in the modulatory activity of the above-mentioned parameters.

The regulation of hypoxia can be achieved through indirect regulation of HIF-1ɑ. The resistance to hypoxia is also achieved through AKT1 signaling [40]. AKT1 dictates the expression of HIF-1ɑ, and inhibition of AKT1 resulted in the alleviation of HIF-1ɑ expression [41]. Hence, AKT1 may encompass the regulatory mechanism of DGT, DGC, and DGT + DGC treatment. Fortuitously, most of the compounds from GT and GC could interact with AKT1 at its inhibitory site. Cafestol, chlorogenic acid, kahweol, EC, ECG, EGC, and EGCG bound to AKT1 near the Inhibitor-8, a known inhibitor for AKT1 (Table 2, Fig. 2). Molecular dynamics simulations also complement the evidence by showing stable binding of those compounds to perform an inhibitory activity (Fig. 3). Kahweol also affected the structural integrity of AKT1 with great binding affinity, as shown in the RMSD of ligand movement and free-binding energy calculations. Other compounds above also perform excellent binding to the allosteric inhibition site of AKT1 as Inhibitor-8. The inhibition of AKT1 by those compounds may alter the AKT1 ability to induce HIF-1ɑ expression. The low level of HIF-1ɑ directly suppresses the CT-1, STAT3, GATA4, and BNP expression, consecutively. As a result, a low level of BNP will repair cardiac function. Therefore, the DGT, DGC, and DGT + DGC may exhibit their cardio-protective activity through indirect CT-1 expression regulation by inhibiting AKT1 activity. Nevertheless, the measurement of HIF-1ɑ expression was not measured in this study. The measurement of HIF-1ɑ along with the AKT1 expression will further clarify the association of AKT1 inhibition to regulate CT-1 through AKT1 and HIF-1ɑ axis. In addition, the use of quantitative Real-Time Polymerase Chain Reaction (qRT-PCR) also needed to confirm the current results.

5 Conclusions

MetS upregulated CT-1, STAT3, GATA4, and BNP, while treatment with DGT, DGC, and DGT + DGC decreased the expression of these genes. The protective role of DGT, DGC, and DGT + DGC may occur through AKT1 inhibition by several bioactive components, mainly cafestol, chlorogenic acid, kahweol, EC, ECG, EGC, and EGCG. The DGT + DGC provided better bioactivity by regulating the expression as the N level.

Availability of data and material

Not applicable.

Abbreviations

CVD:

Cardiovascular diseases

MetS:

Metabolic syndrome

IR:

Insulin resistance

DGT:

Decaffeinated green tea

DGC:

Decaffeinated green coffee

DGT + DGC:

Decaffeinated green tea and decaffeinated green coffee combination

CT-1:

Cardiotrophin-1

STAT3:

Signal transducer and activator of transcription 3

GATA4:

GATA binding protein 4

BNP:

B-type natriuretic peptide

HIF-1ɑ:

Hypoxia-inducible factor 1-alpha

AKT1:

RAC-alpha serine/threonine-protein kinase

IL-6:

Interleukin-6

gp130:

Membrane glycoprotein 130

HFHS:

High-fat and high-sucrose

STZ:

Streptozotocin

3D:

Three-dimension

EC:

Epicatechin

ECG:

Epicatechin gallate

EGC:

Epigallocatechin

EGCG:

Epigallocatechin gallate

PDB:

Protein data bank

RMSD:

Root-mean-square deviation

RMSF:

Root-mean-square fluctuations

qRT-PCR:

Quantitative real-time polymerase chain reaction

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Acknowledgments

The authors thank the laboratory assistant of the Laboratory of Animal Physiology, Structure, and Development, Department of Biology, Brawijaya University, for their technical assistance during the experiments. The authors also thank to Dwi Adi Nugroho for the advice during the study, Adrian Pearl Gunawan, Evalina Izzatur Rochmah, Adinda Nabila Azzah, Andi Nurul Isri Indriany Idhil, Fuad Abdullah for reviewing of the Journal article.

Funding

This project was financially supported by the Ministry of Education, Culture, Research, and Technology, Republic of Indonesia (Grant No. 1071.37/UN10.C10/TU/2022).

Author information

Authors and Affiliations

  1. Department of Cardiology and Vascular Medicine, Faculty of Medicine, Brawijaya University, Malang, East Java, 65145, Indonesia

    Mohammad Saifur Rohman

  2. Cardiovascular Research Center, Brawijaya University, Malang, East Java, 65145, Indonesia

    Mohammad Saifur Rohman, Mifetika Lukitasari, Mukhamad Nur Kholis, Nila Aisyah Wahyuni, Beryl Reinaldo Chandra & Nashi Widodo

  3. School of Nursing, Faculty of Health Sciences, Brawijaya University, Malang, East Java, 65145, Indonesia

    Mifetika Lukitasari

  4. Master Program of Biomedical Sciences, Faculty of Medicine, Brawijaya University, Malang, East Java, 65145, Indonesia

    Mukhamad Nur Kholis, Nila Aisyah Wahyuni & Beryl Reinaldo Chandra

  5. Faculty of Animal Sciences, Brawijaya University, Malang, East Java, 65145, Indonesia

    Feri Eko Hermanto

  6. Bioinformatics Research Center, Indonesian Institute of Bioinformatics (INBIO Indonesia), Malang, East Java, 65145, Indonesia

    Feri Eko Hermanto

  7. School of Population Health, Faculty of Medicine, University of New South Wales, Samuels Building, F25, Samuel Terry Ave, Kensington, NSW, 2033, Sydney, Australia

    Mifetika Lukitasari

  8. Department of Biology, Faculty of Mathematics and Natural Sciences, Brawijaya University, East Java, 65145, Malang, Indonesia

    Nashi Widodo

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  1. Mohammad Saifur Rohman
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  4. Nila Aisyah Wahyuni
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Contributions

MSR and ML conceived and designed the study. MNK, NAW, BRC, and FEH performed the experiments. BRC, FEH, and NW wrote, reviewed, and edited the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Mifetika Lukitasari.

Ethics declarations

Ethics approval and consent to participate

This study was approved ethically by the Ethical Committee of the Faculty of Medicine, Brawijaya University, Malang, East Java, Indonesia (Reference no. 148 /EC /KEPK–S2 /06 /2021).

Consent for publication

Not applicable.

Competing interests

None.

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Rohman, M.S., Lukitasari, M., Kholis, M.N. et al. Combination of decaffeinated green coffee and decaffeinated green tea ameliorates cardiomyopathy through cardiotrophin-1-dependent expression regulation in a metabolic syndrome rat model: a proposed mechanism. Beni-Suef Univ J Basic Appl Sci 12, 53 (2023). https://doi.org/10.1186/s43088-023-00381-w

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