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Palm oil extracts protected against cadmium chloride poisoning via inhibition of oxidative stress in rats

Abstract

Background

The probable mechanism of an earlier reported capacity of palm oil extracts to confer protection against high dose cadmium poisoning in rats was reported in this study. Similar experimental design earlier reported by us was retained. Rats therefore were sacrificed at intervals of twelve; twenty four and forty eight hours post CdCl2 insult.

Results

Oxidative stress and antioxidant status (malondialdehyde, superoxide dismutase, catalase and glutathione) were assessed in tissues (liver, kidney, heart, brain, muscle) and serum. Oxidative stress indicators showed a significantly (p < 0.05) increased lipid peroxidation and alterations in antioxidant defence systems occasioned by drop in catalase and superoxide dismutase enzymes (serum, liver, heart, brain and kidneys) of the rats. Also observed were significant (p < 0.05) reduction in the non-enzymatic antioxidant reduced glutathione over time. Pre-administration of rats with the crude palm oil and its extracts modulated cadmium mediated depletion of the antioxidant capacities of rats acutely exposed to cadmium and rising lipid peroxidation profile.

Conclusions

Regulation of stress and antioxidant response was the underlying mechanism by which the extracts conferred protection against high dose cadmium insult thus suggesting its potential as a viable therapeutic target against its deleterious effects.

Graphical Abstract

Highlights

  1. 1.

    28 days administration of Palm oil and its fractions contributed in boosting antioxidant defence system by increasing activities of superoxide dismutase (SOD), Catalase (CAT) and levels of reduced glutathione (GSH) in serum rat tissues.

  2. 2.

    Administration of cadmium chloride led to increased peroxidation of lipid marked by high levels of malondialdehyde (MDA) within 48 h.

  3. 3.

    The boosted antioxidant capacity responded in sequestration of increasing oxidative radicals within the system to restore stability.

  4. 4.

    Oxidative radicals contributes to inhibition and depletion of antioxidants (CAT, SOD and GSH).

Background

Cadmium poses risk at the slightest level of exposure to animals and plants. This is because the body does not have much capacity to degrade it to less harmful chemical forms. It is poorly excreted and is easily bio-accumulated (Dong et al. 2019). When exposed to the body, several organs and tissues are under attack. Cadmium endangers immune and metabolic stability. In acute cadmium poisoning, its symptoms usually manifests within 24 h affecting cardiovascular functions. This leads to shortness of breath, general weakness and fever. In some other severe cases, it may manifest in form of pneumonia, respiratory malfunctioning and death (Massanyi et al. 2020). The management of heavy metal poisoning like lead and cadmium basically relies on use of chelating agents which in most cases are expensive with significant side effects (Twumasi et al. 2014). The use of natural products for treatments of various forms of poisoning proves to exert negligible side effects and is not financially debilitating (Oyem et al. 2021; Orororo et al. 2018a, b, c, d, e; Okpoghono et al. 2018; Atagana and Asagba 2015).

Palm oil emanates from the fleshy mesocarp of the African oil palm tree (Elaeis guineensis Jacquin) (Mahlia et al. 2019). It belongs to the Palmae family and has the ability of growing up to a height of 20–30 m as well as having an economic life span between 20 and 30 years. The extraction of palm oil is done either mechanically or through traditional methods of milling of the fleshy mesocarp of the oil palm fruit (Edem and Akpanabiatu 2006; Lara Alvarenga et al. 2019). The oil is rich in carotenoids which gives its characteristically orange red colour and also has phospholipids, vitamin E and other essentials as constituents (Obahiagbon 2012).

Aside being a major constituent of food and the major source of carotenoids, the key dietetic and vigor promoting constituent of palm oil is fatty acids (Lara Alvarenga et al. 2019; Gutbrod et al. 2021). These constituents of palm oil are the basis for beneficial property of this man’s food source which has been increasingly used as antidote for accidental consumption of noxious substances. In the light of this a record of its ethnopharmacological importance abounds in literature. For example, its antimicrobial efficacy was reported and well documented by Ekwenye and Ijeomah (2005), it is applied in traditional medicine as a treatment for several diseases and skin infections in South Eastern Nigeria and other parts of the world (Abbasi et al. 2010). Palm oil (Elaeis guineensis Jacquin) is reported to have antidotal, aphrodisiac and a diuretic efficacy while folklore medicine sees it as a remedy for headaches, pains, rheumatism, thrombosis and cardiac diseases (Ekwenye and Ijeomah 2005; Sasidharan et al. 2012; Ismail et al. 2018).

As a remedy for chemical and other variety of poisons, Nguefack et al. (2017) reports that it is used by local inhabitants of Yaounde, Cameroun as a quick antidote before clinical presentation. While together with other herbs, its administration is said to act as antidotes for several poisonous agents including chemicals in South East and South Western Nigeria (Owoyele and Owolabi 2014). Its efficacy has been reported for the treatment of Cyanide poisoning due to consumption of poorly processed cassava (Manihotesculanta Crantz) (Ononogbu 1990; Uvere 1999). Crude palm oil and its fractions have been experimentally tried as a natural remedy against lead poisoning (Twumasi et al. 2014). While it has been comparatively explored as a natural attenuator of lead and cadmium accumulation in the liver of Wistar rats (Nwaokocha et al. 2012), it has also been explored for management of diet mediated crude oil poisoning (Achuba and Ogwumu 2014; Achuba 2018).

This report is a continuation of our ongoing study, which reported the beneficial effects of palm oil fraction pre-treatment. The current paper therefore postulates that a systematic control of oxidative stress status is a dependent biochemical and metabolic adjustment by which palm oil fraction pre-treatment conferred protection against the deleterious effects and enzymatic destabilizing responses arising from high dose exposure to cadmium over a 48 h period.

Methods

Drugs and chemicals used

Cadmium salt (CdCl2) used in this study was purchased from Sigma Aldrich Co. Poole England. Other analytical grade chemicals were also purchased from Sigma Aldrich Co and British Drug House Chemicals, Poole, England.

Palm fruit collection, extraction and fractionation of palm oil

Palm fruit collection and identification, extraction, fractionation and procedures for preliminary antioxidant constituent analysis was carried out as previously reported by Ichipi-Ifukor et al (2019a).

Ethical approval

Approval for the current study was given by the Faculty of Science Ethics committee and it has an approved study number ETH/15/16/PG223056. The ethics for the study also conformed to the guidelines for animal research stated by the Animal Research Ethics (2009) and the World Medical Association (2016) on use of animal for research.

Animal mobilization and experimental design

The study utilized 72 male rats that were purchased from the Emma Maria Research Laboratory and Consultancy Abraka, Nigeria. They had an average weight range of 180-200 g, were also between 8 and 10 weeks old. Following a two weeks period of acclimation to the study environment, they were shared into six groups (1–6) made up of 12 animals per group. All animals were allowed to access water and commercial rat chow at will, a cycle of 12 h light and 12 h darkness throughout the study period. Pre-treatment with 5 ml/Kg body weight of the palm oil fractions: groups 3–6 (Crude fraction: CF, Gel fraction: GF, Bleached fraction: BF and Unsaponifiable fraction UF), followed a timeframe of 28 days after putting into consideration the lethal dose of an undiluted palm oil 5 g/kg body weight as reported by Johnson and Slag (2009). This was eventually followed by a single high dose (20 mg/kg bodyweight) administration of cadmium chloride (CdCl2) based on an earlier established lethal dose of cadmium chloride at 88 mg/kg body weight and its toxicity potential put at 15.3 mg/kg body weight within 24 h (Agency for Toxic Substances and Disease Registry (ATSDR) 2008) for groups 2–6. All administration was done by gavage using a 5 ml syringe and four rats from each group were sacrificed at intervals of twelve hours, twenty four hours and forty eight hours after cadmium chloride administration.

Collection and preparation of samples

Rats were sacrificed via cervical decapitation at different time intervals of twelve hours, twenty four hours, and forty eight hours respectively after administration of cadmium chloride. The blood and tissue samples were collected after cervical dislocation of the rats were carried out. Blood samples collection was done after cutting the rats open through cardiac puncture. Organs such as liver, kidney and heart were harvested, weighed and kept in well labelled containers. Whole brain was collected by carefully cutting open the skull while the muscle tissue was collected from the lower right leg around the femoral region. Preparation of the serum and tissue homogenates for analysis was maintained under a cold chain as earlier reported (Ichipi-Ifukor et al. 2019b).

Analysis of oxidative stress indices

Oxidative stress and antioxidant indices were analysed by standard procedures. Lipid peroxidation noted by Malondialdehyde (MDA) concentrations was carried out by the method of Gutteridge and Wilkins (1982); the reduced glutathione (GSH) was estimated in serum and tissue homogenates using the method of Ellman (1959) while the activity of superoxide dismutase (SOD) in the serum and tissue homogenates was estimated spectrophotometrically using an earlier published method of Misra and Fredorich (1972). Catalase (CAT) activity assay was carried out by the method of Cohen et al. (1972).

Method of statistical analysis

Data was analysed using the computer software the statistical package for social sciences version 21 (SPSS 21). The simple analysis of variance (ANOVA) was used, while multiple comparisons of the means across groups were done using Tukey HSD analysis at a significant level of p < 0.05.

Result

Palm oil fractions abates rise in malondialehyde (MDA)

The result presented in Table 1 shows the levels of Malondialdehyde (MDA) in tissue and serum after 12 h, 24 h and 48 h of acute cadmium post-administration periods in rats pre-treated with palm oil and palm oil extracts. There were elevated levels of MDA in only cadmium administered rats in all tissues 12 h, 24 h and 48 h post cadmium administration periods except in the brain (12 h and 24 h) (p < 0.05). At the end of the 48 h treatment periods, pre-treatment with palm oil and its extracts mediated the reduction in MDA levels in all tissues except for CF and UF relative to control group 2. Put together the findings of this study suggests that GF and UF conferred more protection against rise in stress indices.

Table 1 Effect of palm oil fractions on levels of malondialdehyde (MDA) in tissue and serum of rats administered cadmium (μmol ml−1)

Palm oil fractions mitigates depletion of reduced glutathione

The result presented in Table 2 shows the levels of reduced glutathione in tissue and serum after 12 h, 24 h and 48 h of acute cadmium administration in rats pre-treated with palm oil and palm oil fractions. At the end of 12 h period, GSH reduced in (liver, kidney and heart) of all groups administered cadmium chloride (2–6) while (Brain, muscle and serum) remained significantly unchanged.

Table 2 Effect of palm oil fractions on levels of reduced glutathione (GSH) in tissues and serum of rats administered cadmium (µmol/mg protein)

Reduction in GSH levels in cadmium only groups continued in all other tissues and serum except muscle 24 h and 48 h post administration periods relative to control. Pre-treatment with palm oil fractions increased GSH levels near control levels (except for CF in liver, brain after 24 h) and liver, heart, and all groups in the brain after 48 h cadmium intoxication which had no significance compared to cadmium only groups. Changes in GSH depletion relative to control indicate a negative change potential in all tissues except for UF kidney and CF brain 12 h post cadmium treatment. The liver in all treatment periods had the highest level of GSH. On the whole, the GF and CF offered more protection against the depletion of GSH in rats.

Palm oil fractions inhibits reduction of catalse enzyme activities

The result presented in Table 3 shows the activity of catalase in tissues and serum after 12 h, 24 h and 48 h of acute cadmium administration in rats pre-treated with CF and its fractions.

Table 3 Effect of palm oil fractions on activities of tissue and serum catalase (CAT) of rats administered cadmium (μmol min−1 g−1tissue)

The activity of catalase in the organs (liver, kidney and heart) of cadmium treated (group B) showed a significant (p < 0.05) reduction after 12 h, 24 h and 48 h periods of exposure compared to control (group 1). Conversely, activity of the enzyme was significantly (p < 0.05) increased in the (liver, kidney, heart and serum) of all pre-treated groups relative to group 2 but reduced compared to group 1 after 12 h. Similar trends were observed in all tissues and serums after 24 h period except for muscle tissue which was not significant (p > 0.05) compared to cadmium only group.

At the end of 48 h treatment period, similar trends of significant (p < 0.05) increase in all tissues except for brain in palm oil and its fraction pre-treated groups were observed relative to cadmium only groups while reductions occurred relative to control. It also showed a gradual up regulation of the enzyme activities as conferred by palm oil fractions pre-treatment with CF conferring a greater level of protection.

Palm oil fractions inhibits superoxide dismutase enzyme activities in ratsAfter CdCl2 exposure

The results presented in Table 4 shows the activity of Superoxide Dismutase (SOD) in tissues and serum after 12 h, 24 h and 48 h of acute cadmium administration in rats pre-treated with palm oil and palm oil extracts. Irrespective of the duration of exposure, the SOD activity was significantly decreased in the serum and tissues (brain and muscle excluded) of Cd exposed rats (group 2) as compared to control (group 1). No significant (p > 0.05) effect on SOD activity was observed in the brain in all periods of exposure to Cd. Similarly, no significant change was observed in Muscle SOD activity after 12 h exposure to Cd. Irrespective of duration, pre-treatment of Cd exposed rats with palm oil and palm oil extracts (groups 3–6) significantly increased (brain excluded) the serum and tissue SOD activity relative to rats exposed to Cd alone (group 2).

Table 4 Effect of palm oil fractions on activities of tissue and serum superoxide dismutase (SOD) of rats administered CdCl2 (Units g−1 tissue) or (Units ml−1) in serum

In all groups pre-treated with CF, GF, BF and UF, there were observed significant increase in SOD activities relative to cadmium only group in (Liver, Kidney, Heart, Muscle and Serum) after 24 h and 48 h periods but significantly reduced relative to control for CF (Muscle and liver excluded), GF (Muscle and heart excluded), BF (liver and Muscle excluded) and UF (liver and kidney excluded) after twenty four hours of treatment. Findings further reveals that CF and GF were more effective in reversing the effect of CdCl2 on SOD activity.

Discussion

Here we show a persistent rise in oxidation of lipids noted by high degree of (MDA) in the organs (Liver, Kidney and Heart) and serum (Table 1) of rats exposed to cadmium chloride only. This is consistent with available information in literature which noted that onset of rise in peroxidation of lipids within tissues occurs in response to overwhelming rise in reactive oxygen and nitrogen species (ROS and RNS). This alarming increase is often influenced by uncontrolled depletion of antioxidants serving as scavengers for ROS and RNS (Ramalingam and Kim 2012; Oyem et al. 2021).

Although the onset of increase in MDA was higher in the liver and was time dependent, there was significant rise in all tissues and serum except for the brain and muscle tissues. It is notable to say that modulation of rise in MDA levels occurred first in the kidney of rats administered the GF when compared to rats receiving only cadmium as significant reductions were first observed at the 12 hour post administration period followed by a non-significant increase in all other tissues and serum. Likewise, reductions in MDA concentrations in the liver of CdCl2 administered rats pre-treated with gel fraction 12h post CdCl2 administration. At the end of the 24 and 48 hours mark, significant reductions in liver lipid peroxidation comparative to the cadmium only (Group 2) were also reported in rats pre-treated with crude fraction, gel fraction, bleached fraction and unsaponifiable fractions. Thus the modulation of liver lipid peroxidation was significant at the end of 24 and 48 hours relative to group 2 (CdCl2 only) unlike the kidney were a non-significant increase was very evident due to its reduction to near normality relative to the control by the crude fraction, gel fraction, bleached fraction and unsaponifiable fraction. This trend is in line with our earlier published data (Ichipi-Ifukor et al. 2019b) on the reduction of activities of oxidative enzymes (aldehyde oxidase and sulphite oxidase) at the end of twenty four and forty eight hours to near normality by pre-treatment with CF, GF, BF and UF in the livers and kidneys. This observation therefore further substantiates an earlier claim that oxidative enzymes rise, often occur as second messenger responders to generation of sulfoxides, N-oxides and aldehydes arising from oxidation of lipids within the tissue architecture (Kweki et al. 2018; Asagba 2005; Isamah and Asagba 2004).

We have previously showed that crude fractions and gel fractions of palm oil possesses high levels of tocopherols and carotenoids (Ichipi-Ifukor et al. 2019a), which may be justification for the high potency in prevention of lipid peroxidation. These phytonutrients have also been severally implicated in the fortification of tissues due to rich availability of phospholipids which interacts with vitamin E and other antioxidant cascades for the sustenance of oxidative homeostasis (Obahaigbon 2012; Oguntibeju et al. 2012). This also is in line with the submissions of Twumasi et al. (2014) and Osei (2013) who noted the ability of these extracts to reverse to normal levels of haematological parameters, serum aspartate amino transferase (AST) and Alanine amino transferase (ALT) relative to control after the extracts have been used to treat rats poisoned with lead.

Likewise, the observations made in this study is in consonance with the submissions of Nwokocha et al. (2012) whose result revealed the benefit of palm oil diet supplementation to alter the induced oxidative erosion caused by lead and cadmium. They further submitted as in this study that the hepato-protective effect might be correlated with its antioxidant, free radical scavenger effects, hepatic drug-metabolizing enzymes induction and probably chelating properties. Earlier we also reported the ability of palm oil fractions pre-treatment to alter haematotoxicity owing to their ability to induce several levels of immune responses that mediates the protection of the tissue membranes from oxidative damage (Asagba et al. 2019). The insignificant efficacy of cadmium mediated rise in brain lipid disarmament may be justified by the reduced ability of the metal to cross the blood brain barrier thus preventing cadmium from causing very serious deleterious effects in the brain (Ichipi-Ifukor et al. 2013; Asagba and Obi 2005).

Bernhoft (2013) submits that cadmium affects the cardiovascular system in several ways especially relative to available epidemiological evidences that links Cd with sudden cardiac death, peripheral arterial disease and myocardial infarction (Everette and Fristein 2008;Menke et al. 2009; Messner et al. 2008). These studies are also suggestive that the possible mechanisms for cadmium mediated membrane instability include disruption of calcium ion channels, direct vasoconstriction, hampering of nitric oxide (NO) and other vasodilators, and perhaps reduced cellular oxygen uptake. This also may explain the observed early reduction reported for antioxidants (Tables 2, 3, 4) because of a possible hypoxic state within the tissue membrane occurring from the high dose of cadmium chloride (Woo et al. 2013; Shen et al. 2020). Hypoxic state ordinarily has been established to contribute greatly to increased generation of oxidative radicals capable of antagonising the scavenging capacities of several antioxidants (Adebambo et al. 2018). Giving an explanation to the possible involvement of the hypoxic status mediated by cadmium in our earlier report (Asagba et al. 2019), is an implicative involvement of acute cadmium administration to initiate increased disruption of erythrocytes owing to drop in blood haemoglobin and reduced red blood cells which are primary transporters of oxygen within the blood and body systems. This inference is also supported by the purported ability of cadmium to significantly affect hypoxia mediated expression of haemoglobin and erythropoietin (Dangre et al. 2010). Furthermore, we noted the gradual increase and build-up of white blood cells following cadmium intoxication may be indicative of an early induction of inflammatory responses to external immune modulators (Asagba et al. 2019).

It is imperative to note that steady elevation in stress indices evidently represented by increased MDA levels in the heart has been linked to the induction of myocardial infarction (Di Fillipo et al. 2006). Results from this study (Tables 1, 2, 3, 4) gives an insight into the possible induction of myocardial infarction in only cadmium treated rats owing to an elevated lipid disarmament and reduced levels of the antioxidant markers (GSH, CAT and SOD) by cadmium 24 h and 48 h post administration periods respectively in the heart and serum. This trend were also observed in rats treated with crude palm oil and palm oil fractions (CF, GF and UF), which were also slowed down implying the possible action of these extracts in controlling the Cd-induced heart disorders or myocardial infarction. This claim is justifiably supported by Bester et al. (2010) who demonstrated a reduction in the level of oxidative-modified proteins as well as an attenuation of the increase in free oxygen radicals in the heart. Likewise, the study of Narang et al. (2004) used an isolated heart model of rats to demonstrate the effect of palm olein in the diet on ischemia reperfusion injury (IRI), thus the study was able to demonstrate that 5% olein-supplementation of diet, was able to increase the level of antioxidants in the myocardium but the levels of thiobabituric acid and reactive substances (TBARS) did not change and remained significant comparatively with control rats which had oxidative injury with no corresponding rise in tissue defensive enablers.

Also supporting the claim for the efficacy of palm oil and palm oil fractions to modulate the induction of myocardial infarction are evidences from literature (Esterhuyse et al. 2005a, b, 2006; Kruger et al. 2007; van Rooyen et al. 2008) supporting beneficial roles of palm oil supplemented diets against heart disease, tissue injury and myocardial infarction. In granting credence to our earlier claims, increased depletion of hepatic and renal GSH, CAT and SOD comparative to control group (Tables 2, 3, 4) in all post cadmium administration periods is in tandem with reported rise in MDA values (Table 1) relative to control. This is supported by earlier study of Asagba and Eriyamremu (2007) on a positively correlated rise in MDA values and concurrent drop in SOD, catalase, ATPase activities following oral cadmium consumption.

Conclusions

The initiation of stress markers in acute cadmium poisoning remains a significant mechanism for monitoring its negative impacts. However, the control of lipid peroxidation and allied stress indices within the membrane architecture in the different tissues is a justifiable mechanism for the conferment of the protective roles of palm oil fractions against acute cadmium induced toxicity. These observations therefore may be a scientific based justification for the increased advocacy for incorporation of red palm oil into several of our diets as it has the tendency to boost and elicit the body’s antioxidant defence system.

Availability of data and materials

All data used for this study are available and have been included in the manuscript.

Abbreviations

CF:

Crude Palm Oil Fraction

UF:

Unsaponifiable Palm Oil Fraction

GF:

Silica Gel Fraction

BF:

Bleached Palm Oil Fraction

TBARS:

Thiobarbitoric Acid Reactive Substance

MDA:

Malondialdehyde

PUFA:

Polyunsaturated Fatty Acid

GSH:

Reduced Glutathione

SOD:

Superoxide Dismutase

CAT:

Catalase

ANOVA:

Analysis of Variance

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Conception and Supervision: SOA and CN; Data Gathering: PCI, CN and JCM, Data Analysis: PCI, JCO and JCM, Initial Draft and Literature Review: PCI, JCO and CN, Final Draft/Review: PCI, CN, JCM, JCO and SOA. All authors read and approved the final manuscript.

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Correspondence to Patrick Chukwuyenum Ichipi-Ifukor.

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Approval for the current study was given by the Faculty of Science Ethics committee and it has an approved study number ETH/15/16/PG223056. The ethics for the study also conformed to the guidelines for animal research stated by the Animal Research Ethics (2009) and the World Medical Association (2016) on use of animal for research.

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Ichipi-Ifukor, P.C., Asagba, S.O., Nwose, C. et al. Palm oil extracts protected against cadmium chloride poisoning via inhibition of oxidative stress in rats. Bull Natl Res Cent 46, 5 (2022). https://doi.org/10.1186/s42269-021-00688-7

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Keywords

  • Cadmium chloride
  • Pre-treatment
  • Oxidative stress
  • Antioxidants
  • Palm oil