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Full Length Article
11 2024
:36;
103462
doi:
10.1016/j.jksus.2024.103462

Pharmacological assessment of delphinidin in counteracting polystyrene microplastic induced renal dysfunction in rats

Department of Zoology, Wildlife and Fisheries, University of Agriculture, Faisalabad, Pakistan
Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, China

⁎Corresponding author. zaidsalar1@gmail.com (Muhammad Zaid Salar)

Disclaimer:
This article was originally published by Elsevier and was migrated to Scientific Scholar after the change of Publisher.

Abstract

Polystyrene microplastics (PSMP) are toxic environmental contaminants which can damage various body organs including kidneys. Delphinidin (DEL) is a potential anthocyanidin flavonoid with significant pharmacological benefits. This research was conducted to analyze the protective effect of DEL to avert PSMP prompted renal dysfunction. Rats (n = 24) were divided into 4 separate groups: Control, PSMP (0.01 mgkg−1), PSMP (0.01 mgkg−1) + DEL (25 mgkg−1) and only DEL (25 mgkg−1). Our results showed that PSMP exposure reduced the expressions of Nrf-2 and antioxidant genes while increasing the expression of Keap1. Besides, PSMP intoxication escalated the level of kidney injury markers (urea, KIM-1, creatinine and NGAL) while inducing substantial reduction in the levels of creatinine clearance. Moreover, PSMP significantly reduced the levels of GSH, GST, SOD, HO-1, CAT, GSR, GPx while escalating MDA and ROS. Conversely, inflammatory biomarkers including IL-1β, TNF-α, NF-kB, IL-6 and COX-2 activity were increased due to PSMP intoxication. Our results showed that PSMP administration increased the expressions of Bax and caspase-3 while decreasing the expression of Bcl-2. However, DEL treatment significantly restored the PSMP-induced renal impairments. Therefore, it is suggested that DEL could be used as a therapeutic compound to alleviate PSMP-induced kidney damage in rats, possibly due to its strong pharmacological properties.

Keywords

Protective effect
Delphinidin
Polystyrene microplastics
Renal toxicity
Inflammation
Oxidative stress
Apoptosis
1

1 Introduction

The increasing environmental pollution caused by plastics has garnered significant global attention (Vanapalli et al., 2019). Polystyrene microplastics (PSMP) are among the most harmful plastic contaminants commonly found in the environment. Mammals are exposed to PSMP through ingestion of contaminated food and water, skin contact, and inhalation (Hwang et al., 2020). Once ingested, these microplastics enter the bloodstream and circulate throughout the body, potentially leading to severe toxic effects. The liver, kidneys, and heart are reported to be particularly vulnerable to microplastic-induced damage, as they are responsible for filtering waste and toxins from the body (Wu et al., 2022; Zhang et al., 2022).

Previous studies have demonstrated that exposure to PSMP disrupts the cellular and biochemical profiles of the body tissues by triggering inflammatory responses and generating oxidative stress (OS) (Akbar and Ijaz, 2024). Furthermore, PSMP exposure has been reported to interfere with lipid and energy metabolism, contributing to OS in body tissues (Lu et al., 2018). Recent studies have documented that PSMP exposure impairs the normal physiological function of renal tissues by elevating the levels of kidney injury marker, altering antioxidant enzyme levels, and significantly dysregulating inflammatory and apoptotic biomarker activities in kidney tissues (Ahmad et al., 2023; Ijaz et al., 2024).

Plant-derived therapeutic compounds provide a safer and more effective form of treatment as compared to synthetic chemical drugs (Tiwari and Mishra, 2023). In recent years, numerous studies have highlighted the therapeutic benefits of natural compounds against contemporary disorders and organ toxicities (Tiwari and Mishra, 2023). Flavonoids have also gained global recognition due to their biological potential (Tiwari and Mishra, 2023). Delphinidin (DEL), a plant-based therapeutic compound initially isolated from Delphinium grandiflorum, has been found to possess potent antioxidative, anticancer, and anti-inflammatory properties (Hussain et al., 2022). Therefore, this study aims to evaluate the effectiveness of DEL in mitigating kidney damage induced by PSMP exposure in albino rats.

2

2 Materials and methods

2.1

2.1 Chemicals

PSMP and DEL were acquired from Sigma-Aldrich, Germany.

2.2

2.2 Animals

24 male albino rats (age, 8–12 weeks; weight, 250 ± 20 g) were selected for the experiment. The trial was executed in UAF. Rats were kept in standard environmental conditions (Temp. 22–25 °C, relative humidity, 45 ± 5 % &12-hour light–dark cycle). To ensure their nutritional needs, the rats were given with the ad libitum access to tap water and food chaw. Rats were treated in accordance with the approved protocol of the european union for animal care and experimentation (CEE council 86/609)

2.3

2.3 Experimental layout

24 rats were apportioned into following groups i.e., Control, PSMP (0.01 mgkg–1), PSMP (0.01 mgkg–1) + DEL (20 mgkg–1) and only DEL (20 mgkg–1) administrated group. The dosage of PSMP, 0.01 mgkg−1 was administered in accordance with the previous study of Akbar and Ijaz (2024), whereas the dose of DEL (25 mgkg−1) was selected in accordance with the study of Alvi et al. (2022). At the end of treatment period rat were decapitated. Heparinized tubes were used to collect blood samples. Blood was centrifuged at 3000 rpm for 15 min. Until further analysis, the resulting plasma was stored at −20 °C. Kidney tissues were dissected, homogenized using Na3PO4 buffer (12,000 rpm for 15 min) at 4 °C, centrifuged and the resulting supernatant was kept at −20 °C which was used for further analysis

2.4

2.4 Ribonucleic acid (RNA) extraction & real-time quantitative reverse transcription polymerase chain reaction (qRT-PCR)

To detect changes in gene expression of Nrf-2, Keap1, Bax, Bcl-2, and caspase-3, 95 mg of tissues from kidneys were used. TRIzol (Invitrogen) reagent (Life Technologies, New York, USA) was used to isolate total RNA, while RNA concentrations were evaluated by Nano-Drop 2000c spectrophotometer. Total RNA with A260/A280 ratio between 1.8 and 2.0 was used in reverse transcriptase PCR. Reverse transcription of RNA transformed it into complementary DNA (cDNA) by using total RNA by Fast Quant RT kit (Takara, China). The qRT-PCR was performed in 25 µL of reaction volume using the SYBR Green. β-actin was used as a standard. Relative expression levels were analyzed by 2-ΔΔCT (Livak and Schmittgen, 2001). The specific primer sequence used in this study are listed in Table 1 as previously reported by Ijaz et al. (2021).

Table 1 Primers sequences for the real-time quantitative reverse transcription polymerase (RT-qPCR).
Gene Primers 5′ − 3′ Accession number
Nrf-2 F: ACCTTGAACACAGATTTCGGTGR: TGTGTTCAGTGAAATGCCGGA NM_031789.1
Keap-1 F: ACCGAACCTTCAGTTACACACTR: ACCACTTTGTGGGCCATGAA NM_057152.1
CAT F: TGCAGATGTGAAGCGCTTCAAR: TGGGAGTTGTACTGGTCCAGAA NM_012520.2
SOD F: AGGAGAAACTGACAGCTGTGTCTR: AAGATAGTAAGCGTGCTCCCAC NM_017051.2
GPx F: TGCTCATTGAGAATGTCGCGTCR: ACCATTCACCTCGCACTTCTCA NM_030826.4
GSR F: ACCAAGTCCCACATCGAAGTCR: ATCACTGGTTATCCCCAGGCT NM_053906.2
HO-1 F: AGGCTTTAAGCTGGTGATGGCR: ACGCTTTACGTAGTGCTGTGT NM_012580.2
Bax F: GGC CTT TTT GCT ACA GGG TTR: AGC TCC ATG TTG TTG TCC AG NM_017059.2
Bcl-2 F: ACA ACA TCG CTC TGT GGA TR: TCA GAG ACA GCC AGG AGA A NM_016993.1
Caspase-3 F: ATC CAT GGA AGC AAG TCG ATR: CCT TTT GCT GTG ATC TTC CT NM_012922.2
β-actin F: TACAGCTTCACCACCACAGCR: GGAACCGCTCATTGCCGATA NM_031144

2.5

2.5 Determination of biochemical profile

The CAT activity was measured through the Aebi (1984) technique. The SOD activity was calculated by following the technique documented by Kakkar et al. (1984). For the quantification of GPx Rotruck et al. (1973) technique was employed. Carlberg and Mannervik (1975) along with Jollow et al. (1974) protocol was followed for the measurement of GSR along with GSH. Younis et al. (2018) protocol was followed for the measurement of GST. The ROS and MDA level was ascertained using the approaches of Hayashi et al. (2007) and Ohkawa et al. (1979), respectively.

2.6

2.6 Determination of renal injury biomarkers

The levels of renal injury biomarkers (urea, KIM-1, creatinine, NGAL and creatinine clearance) were determined by using standard ELISA kits in accordance with the instruction of County Antrim, UK.

2.7

2.7 Inflammatory markers analysis

The determination of inflammatory parameters (IL-1β, TNF-α, NF-kB, IL-6 and COX-2) was undertaken using standard kits (ELISA).

2.8

2.8 Statistic evaluation

The collected data were presented as Mean ± SEM. Using Minitab software one-way ANOVA was employed as the primary test for comparing means among different groups following Tukey's test that helps to identify which specific groups differ significantly from each other. P<0.05 were set as a level of significance.

3

3 Results

3.1

3.1 Results of PSMP and DEL on Nrf-2/keap1 pathway

Exposure to PSMP led to a significant increase in Keap1, while decreasing the expression of Nrf-2 and antioxidant genes (CAT, SOD, GPx, GSR and HO-1) as compared to the control group. Co-administration of PSMP and DEL together effectively regulated the expression Keap1, Nrf-2 and antioxidant gene (CAT, SOD, GPx, GSR and HO-1) as compared to PSMP only treated group. Nonetheless, the expressions of aforementioned biomarkers in the DEL-supplemented group and control group were approximately close to each other, as shown in Fig. 1.

Effect of PSMP and DEL on the expression of (a) Nrf-2, (b) Keap1, (c) CAT, (d) SOD, (e) GPx, (f) GSR and (g) HO-1. Data were shown as Mean ± SEM. Dissimilar letters on graph bars denoting substantial distinctions at P<0.05.
Fig. 1
Effect of PSMP and DEL on the expression of (a) Nrf-2, (b) Keap1, (c) CAT, (d) SOD, (e) GPx, (f) GSR and (g) HO-1. Data were shown as Mean ± SEM. Dissimilar letters on graph bars denoting substantial distinctions at P<0.05.
Effect of PSMP and DEL on the expression of (a) Nrf-2, (b) Keap1, (c) CAT, (d) SOD, (e) GPx, (f) GSR and (g) HO-1. Data were shown as Mean ± SEM. Dissimilar letters on graph bars denoting substantial distinctions at P<0.05.
Fig. 1
Effect of PSMP and DEL on the expression of (a) Nrf-2, (b) Keap1, (c) CAT, (d) SOD, (e) GPx, (f) GSR and (g) HO-1. Data were shown as Mean ± SEM. Dissimilar letters on graph bars denoting substantial distinctions at P<0.05.

3.2

3.2 Results of PSMP and DEL on biochemical parameters

Exposure to PSMP increased the levels of MDA and ROS, while reducing the levels of antioxidant enzymes as compared to the control group. However, co-administration of PSMP and DEL decreased the levels of MDA and ROS while escalating the levels of antioxidant enzymes as compared to the PSMP treated group. Nonetheless, only DEL-supplemented group showed values of abovementioned biochemical markers close to the control group, as shown in Table 2.

Table 2 Effect of PSMP and DEL on biochemical markers.
Parameters Groups
Control PSMP PSMP+DEL DEL
CAT (U/mg protein) 1.03 ± 0.12a 0.40 ± 0.11c 0.73 ± 0.13b 1.03 ± 0.13a
GSR (nM NADPH oxidized/min/mg tissue 1.02 ± 0.12a 0.19 ± 0.14c 0.70 ± 0.15b 1.03 ± 0.15a
SOD (U/mg protein) 1.02 ± 0.11a 0.19 ± 0.12c 0.73 ± 0.09b 1.02 ± 0.13a
GSH (U/mg protein) 21.27 ± 1.48a 7.73 ± 0.64c 16.62 ± 0.89b 22.21 ± 1.55a
GPx (U/mg protein) 1.03 ± 0.13a 0.34 ± 0.13c 0.73 ± 0.09b 1.04 ± 0.15a
HO-1 (pmoles bilirubin/ mg protein/h) 1.03 ± 0.12a 0.26 ± 0.16c 0.68 ± 0.14b 1.04 ± 0.13a
GST (U/mg protein) 38.49 ± 2.39a 15.03 ± 2.64c 28.06 ± 2.17b 39.52 ± 2.91a
MDA (nmol/g) 0.63 ± 0.25a 4.35 ± 0.39c 1.35 ± 0.29b 0.59 ± 0.26a
ROS (nmol/g) 1.35 ± 0.28a 7.34 ± 0.49c 2.76 ± 0.34b 1.29 ± 0.30a

Distinct letters next to specific values indicate significant differences., which highlights considerable variations between the groups.

3.3

3.3 Results of PSMP and DEL administration on renal parameters

PSMP intoxication significantly increased the levels of urea, KIM-1, creatinine and NGAL, while causing a considerable reduction in the level of creatinine clearance as compared to the control group. However, PSMP+DEL co-administration restored the levels of these biomarkers as compared to the control group. Nonetheless, the levels of these biomarkers in the DEL-dosed group and the control group were approximately close to each other, as shown in Table 3.

Table 3 Effect of PSMP and DEL on renal function markers.
Parameters Groups
Control PSMP PSMP+DEL DEL
NGAL (ng/day) 0.68 ± 0.19c 5.58 ± 0.55a 1.62 ± 0.41b 0.64 ± 0.17c
Urea (mg/dl) 16.77 ± 3.86c 41.46 ± 2.83a 28.21 ± 1.16b 16.59 ± 3.62c
Creatinine Clearance (ml/min) 1.97 ± 0.42a 0.27 ± 0.23c 1.31 ± 0.38b 2.32 ± 0.30a
KIM-1 (mg/dl) 0.32 ± 0.23c 3.26 ± 0.28a 1.36 ± 0.17b 0.27 ± 0.21c
Creatinine (mg/dl) 1.52 ± 0.33c 5.88 ± 0.49a 2.41 ± 0.20b 1.44 ± 0.28c

Distinct letters next to specific values indicate significant differences., which highlights considerable variations between the groups.

3.4

3.4 Results of PSMP and DEL administration on inflammatory parameters

Exposure to PSMP increased the levels of IL-1β, TNF-α, NF-kB, IL-6 and COX-2 activity as compared to the control group. However, co-administration of PSMP and DEL decreased the levels IL-1β, TNF-α, NF-kB, IL-6 and COX-2 activity as compared to PSMP treated group. Nonetheless, only DEL-supplemented group showed values of abovementioned biochemical markers close to the control group, as shown in Table 4.

Table 4 Effect of PSMP and DEL on renal inflammatory indices.
Parameters Groups
Control PSMP PSMP+DEL DEL
NF-kB (ng/g tissue) 16.77 ± 1.63a 72.58 ± 2.46c 28.49 ± 2.41b 16.54 ± 1.55a
TNFα (ng/g tissue) 13.68 ± 1.54a 66.12 ± 2.14c 23.32 ± 1.95b 13.65 ± 1.34a
IL-1ß (ng/g tissue) 8.07 ± 2.22a 47.22 ± 1.83c 15.33 ± 1.90b 7.83 ± 2.07a
IL-6 (ng/g tissue) 4.95 ± 2.15a 59.34 ± 2.80c 23.59 ± 1.92b 4.79 ± 2.22a
COX-2 (ng/g tissue) 17.31 ± 2.89a 87.83 ± 4.01c 35.95 ± 2.42b 16.55 ± 2.62a

Distinct letters next to specific values indicate significant differences., which highlights considerable variations between the groups.

3.5

3.5 Impact of PSMP and DEL administration on apoptotic biomarkers

PSMP intoxication significantly increased the expression of Bax and Caspase-3 while causing a considerable reduction in the expression of Bcl-2 as compared to the control group. However, PSMP+DEL co-administration restored the expressions of these biomarkers as compared to the control group. Nonetheless, the expressions of these biomarkers in the DEL-dosed group and the control group were approximately close to each other, as shown in Fig. 2.

Effect of PSMP and DEL on the expression of (a) Bax, (b) caspase-3 and (c) Bcl-2. Dissimilar letters on graph bars denoting substantial distinctions at P<0.05.
Fig. 2
Effect of PSMP and DEL on the expression of (a) Bax, (b) caspase-3 and (c) Bcl-2. Dissimilar letters on graph bars denoting substantial distinctions at P<0.05.

4

4 Discussion

The rising environmental accumulation of plastics, particularly PSMP, is increasingly recognized as a significant public health concern due to their role in amplifying the production of reactive oxygen species (ROS) (Geyer et al., 2017). The kidneys, which are crucial for the removal of metabolic waste, are particularly vulnerable to oxidative stress-induced damage. Acute kidney injury (AKI) is a critical condition strongly correlated with elevated oxidative stress (OS) in renal tissues. Therefore, this study was conducted to investigate the protective effects of DEL against PSMP induced renal dysfunction.

Current study explored that PSMP supplementation disturbed the expression of antioxidative genes (CAT, SOD, GPx, GSR and HO-1), Nrf-2 and Keap1. The modulation of these gene expressions through the Nrf-2 and keap1 enables the neutralization of OS (Yamamoto et al., 2018; Hou et al., 2022). Furthermore, Nrf-2 and Keap1 are recognized as modulators of immune responses in the body (Bellezza et al., 2018). Nevertheless, DEL dosage successfully recovered the aforementioned dysregulations.

A downregulation of creatinine clearance and an upregulation of urea, NGAL, creatinine, and KIM-1 can indicate impaired kidney function, reflecting renal stress. Besides, it is discovered that excessive levels of urea can cause tissue injury, inappropriate excretion, and renal failure (Yousef et al., 2006). The loss of glomerular function and tubular injury in the renal tissues can cause a significant rise in creatinine concentration (Mansour et al., 2010). Our results demonstrated that administration of PSMP considerably increased the level of urea, creatinine, KIM-1 and NGAL while substantially reducing creatinine clearance. However, co-administration with DEL escalated the levels of creatinine clearance while downregulating the levels of urea, creatine, KIM-1 and NGAL in renal tissues.

PSMP exposure reduced the activities of antioxidant enzymes while escalating the levels of ROS and MDA. A physiological imbalance between oxidants and antioxidants triggers the cellular phenomena referred to as OS. Various sorts of antioxidant enzymes play an important role in countering OS in the body. SOD is the first and foremost enzyme which is involved in the detoxification processes (Saxena et al., 2022). It is documented that ROS disrupts the cellular redox balance, therefore, it is considered as the major culprit underlying renal toxicity (González et al., 2022). However, the supplementation of DEL escalated the activities of aforementioned antioxidant enzymes as well as elevated the levels of ROS and MDA owing to its polyphenolic nature.

PSMP treatment increased the concentrations of renal inflammatory biomarkers (IL-1β, TNF-α, NF-kB, IL-6 and COX-2). NF-kB holds the potential to control numerous phases of inflammation. OS initiates NF-kB activation which prompt the movement of NF-kB into the nucleus and transcription of interleukins (Wang et al., 2018; Hou et al., 2022; Meng et al., 2022). Hou et al. (2022) and Meng et al. (2022) described that Cox-2 has potential to activate NF-kB that elicits inflammatory responses and causes tissue damage in the body. The results of our study were in line with the study of Ijaz et al. (2024), who reported that PSMP intoxication significantly upregulated the levels of inflammatory markers in the renal tissues of rats. However, DEL supplementation considerably reduced the aforesaid biomarkers concentration.

Exposure to PSMP dysregulated the concentration of apoptotic parameters. Caspase-3 and Bax serve as a stimulator of cellular apoptosis while Bcl-2 counteracts the progression of apoptosis in the cells. The overexpression of Bax modulates the permeability of the mitochondrial membrane, thus culminating in the activation of caspases (Robinson et al., 2011; Meng et al., 2022). Caspases, particularly caspase-3, are reported as fundamental mediators of the apoptotic response, initiating the cell death mechanism by activating other enzymes (Sing et al., 2019). Nonetheless, DEL supplementation reinstated the aforesaid biomarkers.

5

5 Conclusion

In conclusion, PSMP exposure induced kidney impairments in rats by increasing Keap-1, kidney injury markers, inflammatory and pro-apoptotic mediators as well as OS. Additionally, PSMP lessened the expressions of Nrf-2, and antioxidant genes as well as the levels of renal anti-apoptotic markers. Nevertheless, DEL supplementation restored all the impairments that were induced by PSMP intoxication.

6

6 Limitations

Limitation of this study is that clinical studies are required to evaluate potential pharmacotherapeutic effects of DEL to counteract PSMP prompted kidney toxicity in humans. Furthermore, investigating the detailed underlying molecular mechanism responsible for the protective effects of DEL are also required to be studied.

CRediT authorship contribution statement

Nimra Nazir: Writing – original draft, Methodology, Investigation, Conceptualization. Ali Akbar: Writing – review & editing, Methodology, Investigation. Muhammad Zaid Salar: Writing – original draft, Methodology, Investigation, Conceptualization. Mohammad Z. Ahmed: Writing – review & editing, Resources, Funding acquisition. Ayesha Ishtiaq: Validation, Software, Data curation.

Acknowledgement

The authors are thankful to the Researchers Supporting Project number (RSPD2024R728), King Saud University, Riyadh, Saudi Arabia.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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