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Red honeybush tea (RHT) is a tea product developed from Cyclopia spp. which is endemic to South Africa. Aside refreshment, RHT has over the years been used traditionally in the treatment of various diseases including type 2 diabetes. This study investigated the in vivo antioxidant and anti-diabetic activity of RHT concentrated hot water extract in type 2 diabetes (T2D) model of rats. T2D was induced starting with feeding 10% fructose solution ad libitum for 2 weeks followed by a single intraperitoneal injection of streptozotocin (40 mg/kg body weight (BW)). Five weeks of treatment of RHT led to significant (P < 0.05) elevation in serum insulin, pancreatic β-cell function, HDL-c levels with concomitant decrease in AST, ALT, ALP, urea, CK-MB, fructosamine, total cholesterol, triglycerides, LDL-c, and insulin resistance in diabetic rats. RHT also significantly (P < 0.05) decreased MDA levels and enhanced level of GSH, activity of SOD, catalase, GR in most of organs (pancreas, liver, kidneys, and heart). Significantly (P < 0.05) improved morphological changes in the islets and β-cells were observed in rats treated with RHT. The data of this study suggest that RHT demonstrates an outstanding antioxidant and anti-diabetic effects in STZ-induced T2D model of rats.
Red honeybush tea (RHT) is a tea product developed from Cyclopia spp. which is endemic to South Africa. Aside refreshment, RHT has over the years been used traditionally in the treatment of various diseases including type 2 diabetes. This study investigated the in vivo antioxidant and anti-diabetic activity of RHT concentrated hot water extract in type 2 diabetes (T2D) model of rats. T2D was induced starting with feeding 10% fructose solution ad libitum for 2 weeks followed by a single intraperitoneal injection of streptozotocin (40 mg/kg body weight (BW)). Five weeks of treatment of RHT led to significant (P < 0.05) elevation in serum insulin, pancreatic β-cell function, HDL-c levels with concomitant decrease in AST, ALT, ALP, urea, CK-MB, fructosamine, total cholesterol, triglycerides, LDL-c, and insulin resistance in diabetic rats. RHT also significantly (P < 0.05) decreased MDA levels and enhanced level of GSH, activity of SOD, catalase, GR in most of organs (pancreas, liver, kidneys, and heart). Significantly (P < 0.05) improved morphological changes in the islets and β-cells were observed in rats treated with RHT. The data of this study suggest that RHT demonstrates an outstanding antioxidant and anti-diabetic effects in STZ-induced T2D model of rats.
S. Chatterjee, K. Khunti, M.J. Davies, Type 2 diabetes, The Lancet 389 (2017) 2239-2251. https://doi.org/10.1016/S0140-6736(17)30058-2.
F. Folli, D. Corradi, P. Fanti, et al., The role of oxidative stress in the pathogenesis of type 2 diabetes mellitus micro-and macrovascular complications: avenues for a mechanistic-based therapeutic approach. Curr. Diabetes Rev. 7 (2011) 313-324. https://doi.org/10.2174/157339911797415585.
O. Aouacheri, S. Saka, M. Krim, et al., The investigation of the oxidative stress-related parameters in type 2 diabetes mellitus, Can. J. Diabetes. 39 (2015) 44-49. https://doi.org/10.1016/j.jcjd.2014.03.002.
C. Bommer, V. Sagalova, E. Heesemann, et al., Global economic burden of diabetes in adults: projections from 2015 to 2030, Diabetes care 41 (2018) 963-970. https://doi.org/10.2337/dc17-1962.
A. Chaudhury, C. Duvoor, V.S. Reddy Dendi, et al., Clinical review of antidiabetic drugs: implications for type 2 diabetes mellitus management, Front. Endocrinol. 8 (2017) 1-12. https://doi.org/10.3389/fendo.2017.00006.
Ekor M., The growing use of herbal medicines: issues relating to adverse reactions and challenges in monitoring safety, Front. Pharmacol. 4 (2014) 1-10. https://doi.org/10.3389/fphar.2013.00177.
S. Windvogel, Rooibos (Aspalathus linearis) and honeybush (Cyclopia spp.): from bush teas to potential therapy for cardiovascular disease, Intech Open. 2019. https://doi.org/10.5772/intechopen.86410.
A. Kokotkiewicz, M. Luczkiewicz, Honeybush (Cyclopia sp.)–a rich source of compounds with high antimutagenic properties, Fitoterapia 80 (2009) 3-11. https://doi.org/10.1016/j.fitote.2008.11.001.
O.R. Ajuwon, A.O. Ayeleso, G.A. Adefolaju, The potential of south african herbal tisanes, rooibos and honeybush in the management of type 2 diabetes mellitus, Molecules 23 (2018) 3207-3232. https://doi.org/10.3390/molecules23123207.
B.E. van Wyk, B. Gorelik, The history and ethnobotany of cape herbal teas, S. Afr. J. Bot. 110 (2017) 18-38. https://doi.org/10.1016/j.sajb.2016.11.011.
E. Joubert, M. Joubert, C. Bester, et al., Honeybush (Cyclopia spp.): from local cottage industry to global markets—the catalytic and supporting role of research, S. Afr. J. Bot. 77(2011) 887-907. https://doi.org/10.1016/j.sajb.2011.05.014.
B.E. Van Wyk, The potential of south african plants in the development of new medicinal products, S. Afr. J. Bot. 77 (2011) 812-829. https://doi.org/10.1016/j.sajb.2011.08.011.
D.L. McKay, J.B. Blumberg, A review of the bioactivity of south african herbal teas: rooibos (Aspalathus linearis) and honeybush (Cyclopia intermedia), Phytother. Res. 21 (2007) 1-16. https://doi.org/10.1002/ptr.1992.
J.L. Marnewick, Rooibos and honeybush: recent advances in chemistry, biological activity and pharmacognosy, ACS Publications (2009) 277-280. https://doi.org/10.1021/bk-2009-1021.ch016.
X. Xing, D. Li, D. Chen, et al., Mangiferin treatment inhibits hepatic expression of acyl-coenzyme a: diacylglycerol acyltransferase-2 in fructose-fed spontaneously hypertensive rats: a link to amelioration of fatty liver, Toxicol. Appl. Pharmacol. 280 (2014) 207-215. https://doi.org/10.1016/j.taap.2014.08.001.
C.A. Smith, Common names of South African plants, Botanical Research Institute. Pretoria (South Africa), 1966.
T. Beelders, D.J. Brand, D. de Beer, et al., Benzophenone C- and O-glucosides from cyclopia genistoides (honeybush) inhibit mammalian α-glucosidase, J. Nat. Prod. 77 (2014) 2694-2699. https://doi.org/10.1021/np5007247.
N. Miller, C.J. Malherbe, E. Joubert, In vitro α-glucosidase inhibition by honeybush (Cyclopia genistoides) food ingredient extract—potential for dose reduction of acarbose through synergism, Food Funct. 11 (2020) 6476-6486. https://doi.org/10.1039/D0FO01306D.
M. Hubbe, E. Joubert, In vitro superoxide anion radical scavenging ability of honeybush tea (Cyclopia), Royal Society of Chemistry, Stellenbosch (South Africa) 255 (2000) 242-244.
S. Murakami, Y. Miura, M. Hattori, et al., Cyclopia extracts enhance th1-, th2-, and th17-type t cell responses and induce Foxp3+ cells in murine cell culture, Planta. Medica. 84 (2018) 311-319. https://doi.org/10.1055/s-0043-121270.
S. Lo, J. Russell, A. Taylor, Determination of glycogen in small tissue samples, J. Appl. Physiol. 28 (1970) 234-236. https://doi.org/10.1152/jappl.1970.28.2.234.
G.L. Ellman, Tissue sulfhydryl groups, Arch. Biochem. Biophys. 82 (1959) 70-77. https://doi.org/10.1016/0003-9861(59)90090-6.
P. Kakkar, B. Das, P. Viswanathan, A modified spectrophotometric assay of superoxide dismutase, NISCAIR-CSIR. 21 (1984) 130-132. https://hdl.handle.net/123456789/19932.
B. Chance, A. Maehly, Assay of catalases and peroxidases, Methods Enzymol. 2 (1955) 764-775. https://doi.org/10.1016/S0076-6879(55)02300-8.
P. Chowdhury, M. Soulsby, Lipid peroxidation in rat brain is increased by simulated weightlessness and decreased by a soy-protein diet, Ann. Clin. Lab. Sci. 32 (2002) 188-192.
I.K. Smith, T.L. Vierheller, C.A. Thorne, Assay of glutathione reductase in crude tissue homogenates using 5,5′-dithiobis(2-nitrobenzoic acid), Anal. Biochem. 175 (1988) 408-413. https://doi.org/10.1016/0003-2697(88)90564-7.
V.A. Fonseca, Defining and characterizing the progression of type 2 diabetes, Diabetes Care 32 (2009) S151-S156. https://doi.org/10.2337/dc09-S301.
R.D. Wilson, M.S. Islam, Fructose-fed streptozotocin-injected rat: an alternative model for type 2 diabetes, Pharmacol. Rep. 64 (2012) 129-139. https://doi.org/10.1016/S1734-1140(12)70739-9.
O.L. Erukainure, V.F. Salau, V. Bharuth, et al., Hyperglycemia alters lipid metabolism and ultrastructural morphology of cerebellum in brains of diabetic rats: Therapeutic potential of raffia palm (Raphia hookeri G. Mann & H. Wendl) wine., Neurochem. Int. 140 (2020) 104849. https://doi.org/10.1016/j.neuint.2020.104849.
C.I. Chukwuma, R. Mopuri, S. Nagiah, et al., Erythritol reduces small intestinal glucose absorption, increases muscle glucose uptake, improves glucose metabolic enzymes activities and increases expression of glut-4 and irs-1 in type 2 diabetic rats, Eur. J. Nutr. 57 (2018) 2431-2444. https://doi.org/10.1007/s00394-017-1516-x.
B.L. Furman, Streptozotocin‐induced diabetic models in mice and rats, Curr. Protoc. Pharmacol. 70 (2015) 5.47.41-45.47.20. https://doi.org/10.1002/0471141755.ph0547s70.
M.A. Ibrahim, J.D. Habila, N.A. Koorbanally, et al., Butanol fraction of Parkia biglobosa (Jacq.) G. Don leaves enhance pancreatic β-cell functions, stimulates insulin secretion and ameliorates other type 2 diabetes-associated complications in rats, J. Ethnopharmacol. 183 (2016) 103-111. https://doi.org/10.1016/j.jep.2016.02.018.
M.S. Islam, Effects of the aqueous extract of white tea (Camellia sinensis) in a streptozotocin-induced diabetes model of rats, Phytomedicine 19 (2011) 25-31. https://doi.org/10.1016/j.phymed.2011.06.025.
U. Okon, D. Owo, N. Udokang, et al., Oral administration of aqueous leaf extract of ocimum gratissimum ameliorates polyphagia, polydipsia and weight loss in streptozotocin-induced diabetic rats, Am. J. Med. Sci. 2 (2012) 45-49. https://doi.org/10.5923/j.ajmms.20120203.04.
P.V. Röder, B. Wu, Y. Liu, et al., Pancreatic regulation of glucose homeostasis, Exp. Mol. Med. 48 (2016) e219. https://doi.org/10.1038/emm.2016.6.
J.J. Meier, R.C. Bonadonna, Role of reduced β-cell mass versus impaired β-cell function in the pathogenesis of type 2 diabetes, Diabetes Care 36 (2013) S113-S119. https://doi.org/10.2337/dcS13-2008.
N. Chellan, E. Joubert, H. Strijdom, et al., Aqueous extract of unfermented honeybush (Cyclopia maculata) attenuates stz-induced diabetes and β-cell cytotoxicity, Planta. Medica. 80 (2014) 622-629. https://doi.org/10.1055/s-0034-1368457.
H.L. Wang, C.Y. Li, B. Zhang, et al., Mangiferin facilitates islet regeneration and β-cell proliferation through upregulation of cell cycle and β-cell regeneration regulators, Int. J. Mol. Sci. 15 (2014) 9016-9035. https://doi.org/10.3390/ijms15059016.
M. Lauricella, S. Emanuele, G. Calvaruso, et al., Multifaceted health benefits of Mangifera indica L. (mango): the inestimable value of orchards recently planted in Sicilian rural areas, Nutrients 9 (2017) 525. https://doi.org/10.3390/nu9050521.
M. Gondi, U.P. Rao, Ethanol extract of mango (Mangifera indica L.) peel inhibits α-amylase and α-glucosidase activities, and ameliorates diabetes related biochemical parameters in streptozotocin (STZ)-induced diabetic rats, J. Food Sci. Technol. 52 (2015) 7883-7893. https://doi.org/10.3390/antiox7060073.
W. Augustyn, S. Combrinck, B. Botha, Comparison of mangiferin in mango leaf and honeybush infusion, Planta. Med. 77 (2011) PF81. https://doi.org/10.1055/s-0031-1282469.
R.M. Cohen, D.B. Sacks, Comparing multiple measures of glycemia: how to transition from biomarker to diagnostic test?, in: Comparing Multiple Measures of Glycemia: How to Transition from Biomarker to Diagnostic Test?, Clin. Chem. 58 (2012) 1615-1617. https://doi.org/10.1373/clinchem.2012.196139.
H. Malmström, G. Walldius, V. Grill, et al., Fructosamine is a useful indicator of hyperglycaemia and glucose control in clinical and epidemiological studies-cross-sectional and longitudinal experience from the amoris cohort, PLoS One 9 (2014) e111463. https://doi.org/10.1371/journal.pone.0111463.
A. Mohammed, N.A. Koorbanally, M.S. Islam, Anti-diabetic effect of Xylopia aethiopica (Dunal) A. Rich. (Annonaceae) fruit acetone fraction in a type 2 diabetes model of rats, J. Ethnopharmacol. 180 (2016) 131-139. https://doi.org/10.1016/j.jep.2016.01.009.
O.L. Erukainure, O. Sanni, O.M. Ijomone, et al., The antidiabetic properties of the hot water extract of kola nut (Cola nitida (Vent.) Schott & Endl.) in type 2 diabetic rats, J. Ethnopharmacol. 242 (2019) 112033. https://doi.org/10.1016/j.jep.2019.112033.
V. Fonseca, Clinical significance of targeting postprandial and fasting hyperglycemia in managing type 2 diabetes mellitus, Curr. Med. Res. Opin. 19 (2003) 635-631. https://doi.org/10.1185/030079903125002351.
N. Alqahtani, W.A.G. Khan, M.H. Alhumaidi, et al., Use of glycated hemoglobin in the diagnosis of diabetes mellitus and pre-diabetes and role of fasting plasma glucose, oral glucose tolerance test, Int. J. Pre. Med. 4 (2013) 1025-1029.
E. Bartoli, G. Fra, G.C. Schianca, The oral glucose tolerance test (OGTT) revisited, Eur. J. Intern. Med. 22 (2011) 8-12. https://doi.org/10.1016/j.ejim.2010.07.008.
M.A. Ibrahim, M.S. Islam, Anti-diabetic effects of the acetone fraction of senna singueana stem bark in a type 2 diabetes rat model, J. Ethnopharmacol 153 (2014) 392-399. https://doi.org/10.1016/j.jep.2014.02.042.
M. Magnone, P. Ameri, A. Salis, et al., Microgram amounts of abscisic acid in fruit extracts improve glucose tolerance and reduce insulinemia in rats and in humans, The FASEB Journal 29 (2015) 4783-4793. https://doi.org/10.1096/fj.15-277731.
K. Sakaguchi, K. Takeda, M. Maeda, et al., Glucose area under the curve during oral glucose tolerance test as an index of glucose intolerance, Diabetolo. Int. 7 (2016) 53-58. https://doi.org/10.1007/s13340-015-0212-4.
A.E. Schulze, D. de Beer, S.E. Mazibuko, et al., Assessing similarity analysis of chromatographic fingerprints of cyclopia subternata extracts as potential screening tool for in vitro glucose utilisation, Anal. Bioanal. Chem. 408 (2016) 639-649. https://doi.org/10.1007/s00216-015-9147-7.
P.D. Home, G. Pacini, Hepatic dysfunction and insulin insensitivity in type 2 diabetes mellitus: a critical target for insulin‐sensitizing agents, Diabetes Obes. Metab. 10 (2008) 699-718. https://doi.org/10.1111/j.1463-1326.2007.00761.x.
M. König, S. Bulik, H.G. Holzhütter, Quantifying the contribution of the liver to glucose homeostasis: a detailed kinetic model of human hepatic glucose metabolism, PLoS Comput. Biol. 8 (2012) e1002577. https://doi.org/10.1371/journal.pcbi.1002577.
U.J. Jung, M.K. Lee, K.S. Jeong, et al., The hypoglycemic effects of hesperidin and naringin are partly mediated by hepatic glucose-regulating enzymes in C57BL/KsJ-db/db mice, J. Nutr. 134 (2004) 2499-2503. https://doi.org/10.1093/jn/134.10.2499.
O.L. Erukainure, O.A. Oyebode, O.M. Ijomone, et al., Raffia palm (Raphia hookeri G. Mann & H. Wendl) wine modulates glucose homeostasis by enhancing insulin secretion and inhibiting redox imbalance in a rat model of diabetes induced by high fructose diet and streptozotocin, J. Ethnopharmacol. 237 (2019) 159-170. https://doi.org/10.1016/j.jep.2019.03.039.
K. Moodley, K. Joseph, Y. Naidoo, et al., Antioxidant, antidiabetic and hypolipidemic effects of Tulbaghia violacea Harv. (wild garlic) rhizome methanolic extract in a diabetic rat model, BMC Complement. Med. Ther. 15 (2015) 408. https://doi.org/10.1186/s12906-015-0932-9.
G. Kelley, K. Kelley, Effects of aerobic exercise on lipids and lipoproteins in adults with type 2 diabetes: a meta-analysis of randomized-controlled trials, Public Health. 121 (2007) 643-655. https://doi.org/10.1016/j.puhe.2007.02.014.
R. VinodMahato, P. Gyawali, P.P. Raut, et al., Association between glycaemic control and serum lipid profile in type 2 diabetic patients: glycated haemoglobin as a dual biomarker, Biomed. Res. 22 (2011) 375-382.
A.E. Schulze, T. Beelders, I.S. Koch, et al., Honeybush herbal teas (Cyclopia spp.) contribute to high levels of dietary exposure to xanthones, benzophenones, dihydrochalcones and other bioactive phenolics, J. Food Compost. Anal. 44 (2015) 139-148. https://doi.org/10.1016/j.jfca.2015.08.002.
X. Wang, J. Hasegawa, Y. Kitamura, et al., Effects of hesperidin on the progression of hypercholesterolemia and fatty liver induced by high-cholesterol diet in rats, J. Pharmacol. Sci. 117 (2011) 129-138. https://doi.org/10.1254/jphs.11097fp.
U.J. Jung, M.K. Lee, Y.B. Park, et al., Effect of citrus flavonoids on lipid metabolism and glucose-regulating enzyme mrna levels in type-2 diabetic mice, Int. J. Biochem. Cell Biol. 38 (2006) 1134-1145. https://doi.org/10.1016/j.biocel.2005.12.002.
R. Hamzah, A. Lawal, F. Madaki, et al., Methanolic extract of Celosia argentea var. crista leaves modulates glucose homeostasis and abates oxidative hepatic injury in diabetic rats, Comp. Clin. Path. 27 (2018) 1065-1071. https://doi.org/10.1007/s00580-018-2702-9.
O.A. Oyebode, O.L. Erukainure, O. Sanni, et al., Crassocephalum rubens (Juss. Ex Jacq.) S. Moore improves pancreatic histology, insulin secretion, liver and kidney functions and ameliorates oxidative stress in fructose-streptozotocin induced type 2 diabetic rats, Drug Chem. Toxicol. 45 (2020) 1-10. https://doi.org/10.1080/01480545.2020.1716783.
J. Das, J. Ghosh, A. Roy, et al., Mangiferin exerts hepatoprotective activity against d-galactosamine induced acute toxicity and oxidative/nitrosative stress via Nrf2–NFκB pathways, Toxicol. Appl. Pharmacol. 260 (2012) 35-47. https://doi.org/10.1016/j.taap.2012.01.015.
E.S. Ryu, M.J. Kim, H.S. Shin, et al., Uric acid-induced phenotypic transition of renal tubular cells as a novel mechanism of chronic kidney disease, Am. J. Physiol. Renal. Physiol. 304 (2013) F471-F480. https://doi.org/10.1152/ajprenal.00560.2012.
R.J. Johnson, T. Nakagawa, D. Jalal, et al, Uric acid and chronic kidney disease: which is chasing which?, Nephrol. Dial. Transplant. 28 (2013) 2221-2228. https://doi.org/10.1093/ndt/gft029.
S. Saha, S. Mahalanobish, S. Dutta, et al., Mangiferin ameliorates collateral neuropathy in t BHP induced apoptotic nephropathy by inflammation mediated kidney to brain crosstalk, Food Funct. 10 (2019) 5981-5999. https://doi.org/10.1039/C9FO00329K.
A.A. Nogueira, C.M. Strunz, J.Y. Takada, et al., Biochemical markers of muscle damage and high serum concentration of creatine kinase in patients on statin therapy, Biomark. Med. 13 (2019) 619-626. https://doi.org/10.2217/bmm-2018-0379.
T. Wallimann, M. Tokarska-Schlattner, U. Schlattner, The creatine kinase system and pleiotropic effects of creatine, Amino Acids. 40 (2011) 1271-1296. https://doi.org/10.1007/s00726-011-0877-3.
S. Prabhu, M. Jainu, K. Sabitha, et al., Role of mangiferin on biochemical alterations and antioxidant status in isoproterenol-induced myocardial infarction in rats, J. Ethnopharmacol. 107 (2006) 126-133. https://doi.org/10.1016/j.jep.2006.02.014.
W. Arozal, F.D. Suyatna, V. Juniantito, et al., The effects of mangiferin (Mangifera indica L) in doxorubicin-induced cardiotoxicity in rats, Drug Res. 65 (2015) 574-580. https://doi.org/10.1055/s-0034-1394457.
A.J. Núñez Selles, M. Daglia, L. Rastrelli, The potential role of mangiferin in cancer treatment through its immunomodulatory, anti‐angiogenic, apoptopic, and gene regulatory effects, BioFactors 42 (2016) 475-491. https://doi.org/10.1002/biof.1299.
P.S. Sellamuthu, P. Arulselvan, S. Kamalraj, et al., Protective nature of mangiferin on oxidative stress and antioxidant status in tissues of streptozotocin-induced diabetic rats, ISRN Pharmacol. 2013 (2013) 1-10. https://doi.org/10.1155/2013/750109.
X. Li, X. Hu, J. Wang, et al., Inhibition of autophagy via activation of pi3k/akt/mtor pathway contributes to the protection of hesperidin against myocardial ischemia/reperfusion injury, Int. J. Mol. Med. 42 (2018) 1917-1924. https://doi.org/10.3892/ijmm.2018.3794.
Y. Yin, Y. Xu, H. Ma, et al., Hesperetin ameliorates cardiac inflammation and cardiac fibrosis in streptozotocin-induced diabetic rats by inhibiting NF-κB signaling pathway, Biomed. Res. 28 (2017) 223-229.
N. Suryawanshi, A. Bhutey, A. Nagdeote, et al., Study of lipid peroxide and lipid profile in diabetes mellitus, Indian J. Clin. Biochem. 21 (2006) 126-130. https://doi.org/10.1007/bf02913080.
E. Birben, U.M. Sahiner, C. Sackesen, et al., Oxidative stress and antioxidant defense, World Allergy Organ. J. 5 (2012) 9-19. https://doi.org/10.1097/WOX.0b013e3182439613.
O.L. Erukainure, O.M. Ijomone, O.A. Oyebode, et al., Hyperglycemia-induced oxidative brain injury: therapeutic effects of Cola nitida infusion against redox imbalance, cerebellar neuronal insults, and upregulated Nrf2 expression in type 2 diabetic rats, Food Chem. Toxicol. 127 (2019) 206-217. https://doi.org/10.1016/j.fct.2019.03.044.
N. Mchunu, C.I. Chukwuma, M.A. Ibrahim, et al., Commercially available non‐nutritive sweeteners modulate the antioxidant status of type 2 diabetic rats, J. Food Biochem. 43 (2019) e12775. https://doi.org/10.1111/jfbc.12775.
O. Sanni, O.L. Erukainure, O. Oyebode, et al., Anti-hyperglycemic and ameliorative effect of concentrated hot water-infusion of phragmanthera incana leaves on type 2 diabetes and indices of complications in diabetic rats, J. Diabetes Metab. Disord. 18 (2019) 495-503. https://doi.org/10.1007/s40200-019-00456-5.
H. Waggiallah, M. Alzohairy, The effect of oxidative stress on human red cells glutathione peroxidase, glutathione reductase level, and prevalence of anemia among diabetics, N. Am. J. Med. Sci. 3 (2011) 344. https://doi.org/10.4297/najms.2011.3344.
K. Gawlik, J.W. Naskalski, D. Fedak, et al., Markers of antioxidant defense in patients with type 2 diabetes, Oxid. Med. Cell. Longev. 2016 (2016) 1-6. https://doi.org/10.1155/2016/2352361.
F.M. Kandemir, M. Ozkaraca, S. Küçükler, et al., Preventive effects of hesperidin on diabetic nephropathy induced by streptozotocin via modulating TGF-β1 and oxidative DNA damage, Toxin. Rev. 37 (2018) 287-293. https://doi.org/10.1080/15569543.2017.1364268.
P.B. Pal, K. Sinha, P.C. Sil, Mangiferin attenuates diabetic nephropathy by inhibiting oxidative stress mediated signaling cascade, TNFα related and mitochondrial dependent apoptotic pathways in streptozotocin-induced diabetic rats, PloS One 9 (2014) e107220. https://doi.org/10.1371/journal.pone.0107220.
O. Ighodaro, O. Akinloye, First line defence antioxidants-superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx): their fundamental role in the entire antioxidant defence grid, Alexandria J. Med. 54 (2018) 287-293. https://doi.org/10.1016/j.ajme.2017.09.001.
A. Petrova, L.M. Davids, F. Rautenbach, et al., Photoprotection by honeybush extracts, hesperidin and mangiferin against UVB-induced skin damage in SKH-1 mice, J. Photochem. Photobiol B: Biol. 103 (2011) 126-139. https://doi.org/10.1016/j.jphotobiol.2011.02.020.
A.R. Im, S.H. Yeon, J.S. Lee, et al., Protective effect of fermented cyclopia intermedia against UVB-induced damage in hacat human keratinocytes, BMC Complement. Med. Ther. 16 (2016) 1-10. https://doi.org/10.1186/s12906-016-1218-6.
S.K. Ku, J.S. Bae, Vicenin-2 and scolymoside inhibit high-glucose-induced vascular inflammation in vitro and in vivo, Can. J. Physiol. Pharmacol. 94 (2016) 287-295. https://doi.org/10.1139/cjpp-2015-0215.
X. Xiao, O.L. Erukainure, B. Beseni, et al., Sequential extracts of red honeybush (Cyclopia genistoides) tea: chemical characterization, antioxidant potentials, and anti‐hyperglycemic activities, J. Food Biochem. 44 (2020) e13478.
M.M. Elmazar, H.S. El-Abhar, M.F. Schaalan, et al., Phytol/Phytanic acid and insulin resistance: potential role of phytanic acid proven by docking simulation and modulation of biochemical alterations, PLoS One 8 (2013) e45638. https://doi.org/10.1371/journal.pone.0045638
J.P. Costa, T. Islam, P.S. Santos, et al., Evaluation of antioxidant activity of phytol using non- and pre-clinical models, Curr. Pharm. Biotech. 17 (2016) 1278-1284.
M.G. Traber, J. Atkinson, Vitamin E, antioxidant and nothing more, Free Rad. Biol. Med. 43 (2007) 4-15. https://doi.org/10.1016/j.freeradbiomed.2007.03.024
This study was supported by a competitive research grant from the Research Office, University of KwaZulu-Natal (UKZN), Durban; an incentive grant for rated researchers and a grant support for women and young researchers from the National Research Foundation (NRF), Pretoria, South Africa.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).