Protective effect of grape seed and skin extract on high dosage garlic-induced renal oxidative stress

  • Sonia Hamlaoui Laboratoire de Neurophysiologie Fonctionnelle et Pathologies, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Campus Universitaire El Manar II-2092 Tunis, Tunisie
  • Oumayma Samti Laboratoire de Neurophysiologie Fonctionnelle et Pathologies, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Campus Universitaire El Manar II-2092 Tunis, Tunisie
  • Meherzia Mokni Laboratoire de Neurophysiologie Fonctionnelle et Pathologies, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Campus Universitaire El Manar II-2092 Tunis, Tunisie
  • Nadia Limam Laboratoire de Neurophysiologie Fonctionnelle et Pathologies, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Campus Universitaire El Manar II-2092 Tunis, Tunisie
  • Alice Carrier Laboratoire de Neurophysiologie Fonctionnelle et Pathologies, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Campus Universitaire El Manar II-2092 Tunis, Tunisie;
  • Ferid Limam Laboratoire des Substances Bioactives, Centre de Biotechnologie, Technopole Borj-Cedria, BP-901, 2050 Hammam-Lif, Tunis, Tunisie.
  • Ezzedine Aouani Laboratoire des Substances Bioactives, Centre de Biotechnologie, Technopole Borj-Cedria, BP-901, 2050 Hammam-Lif, Tunis, Tunisie.
  • Lamjed Marzouki Laboratoire de Neurophysiologie Fonctionnelle et Pathologies, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Campus Universitaire El Manar II-2092 Tunis, Tunisie
Keywords: Garlic, Grape seed, Kidney, Lipid peroxidation, Oxidative stress
DOI: 10.3329/bjp.v7i2.10482


In this study, the protective role of grape seed and skin extract (GSSE) against high garlic dose-induced renal toxicity has been evaluated. Rats were intraperitoneally injected with garlic (5 g/kg bw) or GSSE (500 mg/kg bw) or a combination of garlic and GSSE at the same doses daily for one month. Renal oxidative stress markers and antioxidant status were evaluated. We also measured plasma creatinine and urea. Data showed that high garlic dose induced renal toxicity by increasing creatinine and urea and a pro-oxidative status characterized by increased malondialdehyde, carbonyl protein, calcium and H2O2, but decreased free iron. Unexpectedly garlic increased catalase but decreased peroxidase and superoxide dismutase activities. GSSE co-treatment counteracted almost all garlic-induced deleterious effects. In conclusion, high garlic dose induced a pro-oxidative state characterized by the Fenton reaction between H2O2 and free iron, inducing Ca2+ depletion, while GSSE exerted antioxidant properties and Ca2+ repletion.


Garlic (Allium sativum L.) has been widely used in traditional medicine and its health effects are mainly attribu-table to organosulfur compounds (Berginc et al., 2010) and to flavonoids and phenolics (Shirzad et al., 2011). However, some controversies persist concerning garlic dose and mode of administration. In a prior study, we showed that a high garlic dose administered intraperitoneally (ip) induced a pro-oxidant effect and ultimately blood toxicity (Hamlaoui-Gasmi et al., 2011a).

Grape seed and skin extract (GSSE) is a nutritional supplement exhibiting beneficial health effects (Suwannaphet et al., 2010) and containing polyphenolics classified as flavonoid and non-flavonoid compounds (Khanal et al., 2009). Flavonoids, which are highly concentrated in seeds, are mainly composed of monomeric catechins, proanthocyanidins, and flavonols such as quercetin (Renaud and De Lorgeril, 1992). Non-flavonoids, highly abundant in skin, contain stilbenes such as resveratrol, which is at the basis of the French Paradox (Renaud and De Lorgeril, 1992). GSSE has wide ranging benefits as cardioprotective (Decordé et al., 2009) and neuroprotective effects (Wang et al.,  2009). More specifically, resveratrol is multi-organ protective owing to its antioxidant (Kelen and Tepe, 2007) and anti-inflammatory properties (Kowalczyk et al., 2010). Proanthocyanidins exert antineoplasic effects by inducing cytotoxicity towards some cancer cells (Chatelain et al., 2011). Quercetin and rutin are neuroprotective (Jimenez-Aliaga et al., 2011), and catechin, epicatechin, and gallic acid exhibited cholesterol-lowering activity (Ngamukote et al., 2011).

 In the present paper, we characterized the effect of a high garlic dose when administered IP on renal oxidative stress as well as the protection offered by GSSE treatment. A high garlic dose induces a pro-oxidative state, and GSSE exerts potent antioxidative properties mainly by counteracting the Fenton reaction of H2O2 with free iron, leading to calcium disturbances.

Materials and Methods


Thiobarbituric acid (TBA); 2,6,-ditert-butyl-4- hydroxytoluene (BHT); trichloroacetic acid (TCA); hydrogen peroxide (H2O2); 2-methoxyphenol (gaiacol); bovine catalase and 4-(1-hydroxy-2-methylamino-ethyl)-benzene-1,2-diol (epinephrine), 2,4,dinitrophenyl hydrazine (DNPH) were obtained from Sigma-Aldrich (Ger-many).

Preparation of garlic and grape seed and skin extracts

One kilogram of garlic (Allium sativum) was purchased from a local market, peeled, and ground for 30  min with an electric mincer (FP3121 Moulinex) until an aqueous suspension was obtained. It was diluted in double-distilled water at 4 g/mL on the basis of the weight of the starting material and centrifuged (Beckman J20, 15 min at 10 000 x g and 4°C). The supernatant was aliquoted into 1 mL fractions and stored at -80°C until use.

GSSE was processed from a grape  cultivar (Carignan) of Vitis vinifera from northern Tunisia. Waste winemaking was collected from Tardi Cooperative Winery (Ain Ghelal). Seeds and skin were dried and ground separately with an electric mincer (FP3121 Moulinex) until a fine powder was obtained. Total phenolic content was determined by the folin- Ciocalteau colorimetric method (Singleton and Rossi, 1965), flavonoids and condensed tannins according to Dewanto et al. (2002) and Sun et al. (1998) respectively (Table I). Powder mixture containing grape seed (50%) and skin (50%) was dissolved in 1 mL of 10% ethanol in the dark, vigorously vortexed for 10 min, centrifuged at 10,000 xg for 15 min at 4°C for debris elimination and the supernatant containing soluble polyphenols was used.

Table I: Phenolics levels in carignan GSSE

Phenolics Seed Skin
Total phenolics (mg/g extract) 67 51
Total flavonoïds (mg/g extract) 16 14
Non flavonoïds (mg/g extract) 51 37
Condensed tannins (mg/g extract) 1.2 3.4
Total anthocyanins (µg/g extract) 0.99 0.96

Animals and treatment

Forty male Wistar rats (200-240 g) from Pasteur Institute of Tunis were used for these experiments in accordance with the local ethic committee of Tunis University, and care of animals which was in conformity with NIH recommendations (NIH, 1985). They were provided with food and water ad libitum and maintained in animal housing at a controlled temperature (22 ± 2°C) with a 12 hours light-dark cycle. Rats were divided into 4 groups of 10 animals each. Group I received ethanol 10% (control), Group II aqueous extract of garlic (5 g/kg bw), Group III GSSE (500 mg/kg bw), and Group IV garlic plus GSSE. Animals were daily administered IP with one of
these treatments for 30 days. Twenty-four hours after the last injection, animals were sacrificed, their kidneys rapidly excised, weighed and homogenized in phosphate-buffered saline (pH 7.4) with an ultrathurax T25 homogenisator at a 2 mL/g ratio. After centrifugation at 10,000 x g for 10 min at 4°C, supernatant was used for the determination of lipoperoxidation, carbonylation, antioxidant enzyme activities and intracellular mediators as free iron, ionizable calcium and H2O2. Blood was also collected, and the plasma was processed for creatinine and urea determination.

Creatinine and urea measurement

Whole blood was obtained by cardiac puncture and collected into heparinized tubes. Plasma was processed after centrifugation at 1,000 x g for 10 min at 4°C and creatinine and urea were determined using an auto blood analyser (Coulter).

Lipoperoxidation determination

Lipid peroxidation was assessed by MDA measurement according to the double heating method (Draper and Hadley, 1990). Briefly, aliquots (200 µL) from kidney homogenates were mixed with 250 µL BHT-TCA solution containing 1% BHT (m/v) dissolved in 20% TCA (m/v) and centrifuged at 1000 g for 5 min at 4°C. The supernatant (400 µL) was blended with 0.5 N HCl (80 µL), and 120 mM TBA in 26 mM Tris (320 µL) and then heated at 80°C for 10 min. After cooling, absor-bance of the resulting pink chromophore was determined at 532 nm using a SmartSpec 3000 Bio-Rad UV-visible spectrophotometer (Germany). MDA levels were determined by using an extinction coefficient for the MDA-TBA complex of 1.56 105 M-1cm-1 (Draper and Hadley, 1990).

Protein carbonylation

Oxidative damage to proteins was evaluated by quantifying protein carbonylation in kidney homogenates according to Levine et al (1990). After proteins were precipitated with 20% TCA and centrifuged at 11,000 x g for 3 min at 4°C (Beckman J20), the pellet was dissolved in 10 mM DNPH-containing buffer. After 3 washes with ethanol-ethylacetate (1:1), the pellet was dissolved in 20 mM potassium phosphate (pH 2.3) containing 6 M guanidine HCl, and absorbance measured at 366 nm using the molar extinction coefficient of 22,000 M-1cm-1. Results were expressed as nmol carbonyl residues/mg protein.

Protein determination

Total soluble proteins were determined according to the biuret method (Ohnishi and Barr, 1978). Briefly, at acidic pH, soluble proteins constituted with copper a colorful complex measurable at 546 nm using a SmartSpec 3000 BioRad UV-visible spectrophotometer.

Antioxidant enzyme activity assays

All spectrophotometric analyses of kidney antioxidant enzyme activities were performed with a SmartSpec 3000 Bio-Rad UV-visible spectrophotometer.

Catalase: CAT activity was assayed by measuring the initial rate of H2O2 disappearance at 240 nm (Aebi 1984). The reaction mixture contained 33 mM (1000 µL) H2O2 in 50 mM (1995 µL) phosphate buffer (pH 7.0) and 5 µL of kidney extract. CAT activity was calculated using an extinction coefficient of 40 mM-1cm-1 for H2O2 (Aebi 1984).

Peroxidase: POD activity was measured at 25°C using guaiacol as the hydrogen donor. The reaction mixture contained 9 mM (25 µL) guaiacol, 19 mM (100 µL)  H2O2 in 50 mM (870 µL) phosphate buffer (pH 7) and 5 μL of kidney extract in a final volume of 1 mL. The reaction was initiated by the addition of H2O2 and monitored by measuring the increase in absorbance at 470 nm every 30 sec for 3 min. POD activity was expressed as nmol of guaiacol oxidized per min and calculated using a molecular extinction coefficient of 26.2 mM-1 (Chance and Maehly, 1955).

Superoxide dismutase: SOD activity was determined by using a modified epinephrine assay (Misra and Fridovich 1972). At alkaline pH, superoxide anion (O2-) causes the autooxidation of epinephrine to adrenochrome. One unit of SOD is defined as the amount of extract that inhibits the rate of adrenochrome formation by 50%. Renal extract was added to a 2 mL reaction mixture containing 10 μL bovine catalase (0.4 U/μL), 20 μL epinephrine (5 mg/mL), and 62.5 mM sodium carbonate-sodium bicarbonate buffer (pH 10.2). Changes in absorbance were recorded at 480 nm. Characterization of SOD isoforms was performed using KCN (3 mM), which inhibites Cu/Zn-SOD or H2O2 (5 mM), affecting both Cu/Zn-SOD and Fe-SOD. Mn-SOD was insensitive to both inhibitors.

Free iron determination

Free iron was determined according to Leardi et al. (1998) using a commercially available kit from Biomaghreb (Ariana, Tunisia). Briefly, at acidic pH 4.8 all Fe3+ released from transferrin was reduced by ascorbic acid into Fe2+, which constituted with ferrozine a purple colorful complex measurable at 560 nm. Briefly, 50 µL of renal extract was added to 250 µL of reaction mixture containing ascorbic acid (5 g/L) and ferrozine (40 mM), and incubation was performed at 37°C for 10 min.

H2O2 determination

H2O2 level was determined enzymatically according to Kakinuma et al. (1979) using a commercially available kit from Biomaghreb. Briefly in the presence of POD, H2O2 reacts with 4-aminoantipyrine and phenol to give a red-colored quinoeimine that absorbs at 505 nm. Results are expressed as mmol H2O2/mg protein.

Calcium measurement

Ionizable calcium was determined according to Stern and Lewis. (1957) using a commercially available kit from Biomaghreb. At basic pH, calcium constitutes with cresolphtalein a purple colorful complex measurable at 570 nm. Briefly, 50 µL of kidney extract was added to 650 µL of reaction mixture containing 2-amino-2-methyl 1-propanol buffer (500 mmol/L), cresolphtalein (0.62 mmol/L), and hydroxy-8 quinoleine (69 mmol/L). Incubation was carried out at room temperature for 5 min assuming the complex was stable for 1 hour.

Statistical analysis

Data were analyzed by unpaired Student’s t-tests or 1-way analysis of variance (ANOVA) and expressed as means ± standard error of the means (SEM). All statistical tests were 2-tailed, and p<0.05 was considered significant.


We determined plasma creatinine and urea used as indexes of kidney injury (Figure 1). Garlic significantly increased plasma creatinine by 60% (Figure 1A) and urea by 20% (Figure 1B). Co-treatment with GSSE counteracted all garlic-induced disturbances to near control level. Thus GSSE decreased plasma creatinine by 36% and urea by 14%.

Figure 1: Effect of garlic and GSSE on plasma creatinine and urea. 10% ethanol (C), garlic (G), grape seed and skin extract (GSSE) or garlic plus GSSE (GSSE/G) were administered to rats for 1 month and plasma cratinine (A), and urea (B) were determined. Results are expressed by mean ± SEM (n= 10). ap<0.01 vs C. bp<0.01 vs G

Figure 2 showed that high garlic dose increased kidney MDA (Figure 2A) by 35% and carbonylated proteins (Figure 2B) by 52%. GSSE per se decreased renal MDA by 77% but had no effect on carbonylated proteins. GSSE also counteracted garlic-induced kidney lipoperoxidation by 57 % and carbonylated proteins by 32%.

Figure 2: Effect of garlic and GSSE on renal lipoperoxidation and carbonylation. 10% ethanol (C), garlic (G), grape seed and skin extract (GSSE) or garlic plus GSSE (GSSE/G) were administered to rats for 1 month and renal lipoperoxidation (A) and carbonylation (B) were determined. Results are expressed by mean ± SEM (n= 10). ap<0.01 vs C. bp<0.01 vs G

We reported in Figure 3 the effects of garlic and GSSE on kidney antioxidant enzyme activities. Garlic unexpectedly increased CAT by 55% (Figure 3A) but decreased POD (61%) (Figure 3B) and SOD (21%) (Figure 3C). In this latter case, garlic mainly decreased the Mn isoform (-70%). GSSE per se clearly increased CAT (+ 73%) and SOD (+ 26%) activities but decreased POD (- 45%). Co-treatment with GSSE increased CAT, POD and SOD. In this latter case, GSSE co-treatment increased the Mn isoform.

Figure 3: Effect of garlic and GSSE on kidney antioxidant enzyme activities. Rats were daily administered with 10% ethanol (C), garlic (G), grape seed and skin extract (GSSE) or garlic plus GSSE (GSSE/G) for 1 month and kidney catalase (A), peroxidase (B) and superoxide dismutase (C) activities were determined. Results are expressed by mean ± SEM (n= 10). ap<0.01 vs C. bp<0.01 vs G

We further sought to determine the putative involvement of renal mediators in garlic and GSSE mode of action (Figure 4). Garlic decreased renal free iron by 55% (Figure 4A), and increased H2O2 by 20% (Figure 4B) and calcium by 65% (Figure 4C). Co-treatment with GSSE abrogated the garlic-induced disturbances of all three mediators to near control level.

Figure 4: Effect of GSSE on garlic-induced intracellular mediators. Rats were daily administered with 10% ethanol (C), garlic (G), grape seed and skin extract (GSSE) or garlic plus GSSE (GSSE/G) for 1 month and renal free iron (A), H2O2 (B) and calcium (C) levels were determined. Results are expressed as means ± SEM (n=10). ap<0.01 vs C. bp<0.01 vs G


The present study revealed that high garlic dose administered ip to rats for 1 month induced renal injury. This effect is evidenced by increased lipoperoxidation and carbonylation and depletion of antioxidant enzyme activities such as POD and SOD. Kidney toxicity was also reflected by elevated plasma creatinine and urea, high level in renal H2O2 and calcium and a concomitant decrease in free iron. Paradoxically a positive effect of garlic on CAT activity might represent a “pro-oxidative state” in light of the unexpected pro-oxidant effect of CAT (Heck et al., 2003). In addition post-translational modifications of antioxidant enzymes and the subsequent gain in activity could also be involved (Borchi et al., 2010; Csar et al., 2001). Organo-sulfurs, flavonoids and phenolics are the major bioactive compounds of aqueous garlic extract (Shirzad et al., 2011). The effect of garlic extract on the kidney could likely result from synergism or antagonism between the various bioactive components of the mixture.

It is well established that elevated intracellular MDA and carbonyl proteins affected the fluidity of the membrane lipid bilayer (Bryszewska et al., 1995). This increase is correlated to pathological or stress conditions including aging (Rizvi and Maurya, 2007). Because of the high polyunsaturated fatty acid content of their membrane, renal cells are highly susceptible to oxidative damage. A possible mechanism by which garlic exerts renal toxicity is its ability to increase calcium and H2O2 which in turn decreases free iron. However, calcium has been previously shown to increase iron transport across the hepatocyte plasma membrane by a mechanism dependant on membrane fluidity (Nilsen, 1991). As in our present case, calcium and H2O2 acted as negative regulators of renal free iron and although the role of calcium channels in free iron uptake by the kidney remains unclear, one can speculate about differential calcium regulation by H2O2 or other ROS via either L-type or T-type calcium channels (Tabet et al., 2004).

Iron is known to play a central role in many pathologies as neurodegenerative (Castellani et al., 2007) and hepatocellular injury (Uchiyama et al., 2008). We observed an increase in plasma free iron (Hamlaoui-Gasmi et al., 2011b) that could result  from  its  extrusion from the kidney. Noteworthy that such an increase  in  plasma  free   iron   has   been   attributed  to DADS which induced the degradation  of  the  ferritin light chain (Antosiewiecz et al., 2006). SAC, which behaved as a metal chelator, interacted with iron to prevent its redox cycling and by this way alleviated lipid peroxidation (Dairam et al., 2008). Furthermore both iron deficiency and iron excess can lead to cellular dysfunction, maintaining iron homeostasis is crucial (Andrews, 1999). Free iron is a well established catalyst of autoxidation. Iron-mediated oxidations of cysteine residues represent a common mechanism through which H2O2 exerts its second messenger role in signal transduction pathways (Barbouti et al., 2007).

Furthermore, H2O2 is able to release intracellular calcium by a sulfhydryl sensitive way (Castro et al., 2004). One can thus speculate about H2O2 induced oxidation of sulfhydryl residues in proteins as calcium channels or antioxidant enzymes as CAT, this oxidation leading to some loss of function of the proteins as observed in the present study (Yamakura and Kawasaki, 2009).

To our knowledge our report is the first one to show that GSSE is renal-protective against garlic-induced oxidative stress and kidney dysfunction. GSSE was used at a dosage (500 mg/kg bw) that was safe and near the optimal concentration precognized by Hebbar et al. (2005). GSSE was also tested at wide ranging doses reaching 4 g/kg bw with no sign of toxicity even at the histological level (not shown). GSSE has been previously shown to protect multiple target organs from doxorubicin (Hamlaoui et al., 2012a; Mokni et al., 2012) or garlic-induced toxicity owing to its antioxidant properties (Hamlaoui-Gasmi et al., 2012b).

Importantly, the most relevant effect of GSSE is its powerful ability in precluding garlic-induced increase in calcium and H2O2 which altered renal free iron. Grape seed and skin proanthocyanidins have been previously shown to protect multiple target organs from drug and chemical-induced toxicity, owing to their antioxidant and antiapoptotic properties (Bagchi et al., 2002). GSSE could act on calcium channels that have been implicated in the co-transport of calcium and iron in the myocardium and liver (Oudit et al., 2003). GSSE could also affect iron shuttling proteins as hepcidin and lipocalin 2, implicated in the regulation of calcium entry via L-type calcium current (Xu et al., 2011) or as protective factor against H2O2 toxicity and apoptosis (Roudkenar et al., 2008). Further experiments using calcium channel blockers as verapamil or nifedipine should address the role of GSSE as a modulator of calcium channel activity or protein expression in iron and calcium co-transport (Otto-Duessel et al., 2011).

We do not yet know which active compounds present in the GSSE extract are responsible for the observed kidney protection. In fact GSSE composition is complex (Khanal et al., 2009) and a synergism could occur bet-ween skin-containing polyphenols and seeds containing fatty acids. In this respect, it was recently demonstrated that fatty acids from magnolias seeds were able to inhibit doxorubicin-induced increase in intracellular calcium, ROS generation and apoptosis in rat cardiomyocytes (Park et al., 2008).

Importantly, GSSE counteracted garlic-induced effects on H2O2, calcium and free iron. These effects could be mediated by ROS scavenging activity of GSSE as demonstrated for resveratrol (Leonard et al., 2003) or as shown for human erythrocytes (Pandey and Rizvi, 2009) and could result from the synergism between various grape-containing polyphenols (Liu, 2004). Consumption of GSSE is protective against cardiovascular diseases in humans (Das and Maulik, 2006) and the combination of resveratrol with quercetin synergistically inhibited the oxidative injury of human erythrocytes in vitro (Mikstacka et al., 2010). Resveratrol up-regulated antioxidant enzyme activities in rat brain (Mokni et al., 2007a), heart (Mokni et al., 2007b) and kidney (Chander et al., 2005). Resveratrol also efficiently protected against endotoxemia-induced acute phase response in rats (Sebai et al., 2009), protected the liver and the heart from oxidative stress induced by LPS (Sebai et al., 2010; Sebai et al., 2011), or acetaminophen (Sener et al., 2006), cadmium (Eybl et al., 2006), alcohol (Bujanda et al., 2006), CCl4 (Rivera et al., 2008), naphthalene (Sehirli et al., 2008), pyrogallol (Upadhyay et al., 2008) and ischemia/reperfusion injury (Hassan-Khabbar et al., 2008). In addition resveratrol has been shown to alleviate alcoholic fatty liver in mice (Ajmo et al., 2008) and more recently to exert protective effects on calcium-induced oxidative stress in rat heart mitochondria (Gutiérrez-Pérez et al., 2011). Quercetin, another polyphenol abundant in GSSE attenuated renal dysfunction and oxidative stress in rats (Muragundla and Kanwaljit, 2004). This polyphenol also reduces cisplatin toxicity in cultured tubular epithelial cells by scavenging free oxygen radicals (Kuhlmann et al., 1998). Quercetin, due to its antioxidant properties, prevented cyclosporine-induced ROS in kidney and consequently cyclosporine nephrotoxicity (Satyanarayana et al., 2001). Catechin reduces the renal ischemia/reperfusion injury by boosting the antioxidant capacity and free radical scavenging activity. Moreover, catechin attenuates the increase in free iron after ischemia/reperfusion and consequently decreases the hydroxyl radical formation through Haber-Weiss and Fenton reactions (Devinder et al., 2005).

One possible mechanism by which GSSE exerts its beneficial effect on kidney is its ability to chelate free iron and scavenge H2O2 as recently demonstrated by Charradi et al. (2011). Further studies should  analyze the implication of specific proteins involved in free iron metabolism as hepcidin (Isoda et al., 2009). Moreover, H2O2 is able to induce dual roles in both survival and cell death pathways, largely depending on its concentration and also on the cell type. However, our results also raised several discrepancies. In particular garlic appeared in the same time as pro-oxidant, increasing MDA, carbonyl proteins, calcium and H2O2 and also antioxidant by increasing CAT activity. GSSE increased CAT and SOD activities mainly the Mn isoform but unexpectedly decreased POD. Our data are reminiscent of those described by Borchi et al. (2010) who showed in a human heart failure model, increased CAT and GPx activities due solely to increased tyrosine phosphorylation. In our case, high garlic dose could provoke phosphorylation of CAT activity but not GSSE which even counteracted garlic effect on post-translational modification of CAT. Garlic-induced oxidative stress was also associated with impaired renal function leading to a marked increase in plasma creatinine and urea. In addition we can’t exclude an effect of garlic as well as of GSSE on transition metals as Mn accumulation into renal cells. As garlic induced in the same time calcium accumulation and an increase in Mn-SOD activity it would be interesting to correlate the observed increase in Mn-SOD with a hypothetical accumulation of Mn into renal cells.


High garlic dose is pro-oxidative and induced kidney toxicity as assessed by free iron depletion and GSSE is renal-protective partly by its antioxidant action.


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