Research Article |
Corresponding author: Ahmed Ageeb Kassid ( ahmed.ajeeb.pharm@almustafauniversity.edu.iq ) Academic editor: Georgi Momekov
© 2024 Ahmed Mohammed Mahmood, Ahmed Ageeb Kassid, Hashim H. Al-Zuaini, Ghasak Kais Abd-Alhussain.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Mahmood AM, Kassid AA, Al-Zuaini HH, Abd-Alhussain GK (2024) Canagliflozin exerts anti-inflammatory and antioxidant effects in the heart and skin tissues: Biochemical and histopathological assessment in a model of accelerated aging induced by D-galactose in mice. Pharmacia 71: 1-8. https://doi.org/10.3897/pharmacia.71.e124801
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Canagliflozin was assessed for its anti-inflammatory and antioxidant effects as an anti-aging drug in animal models. 50 Swiss albino male mice were divided into five groups; all groups received their intervention using gastric gavage; group 1 received normal saline for 14 weeks; group 2 received induction by D-galactose 200 mg/kg/day for seven weeks; and group 3 to 5 received the same induction for seven weeks, followed by another seven weeks of investigated drugs; group 3 received Vitamin C (100 mg/kg/day); group 4 received canagliflozin (3 mg/kg/day); and group 5 received canagliflozin (1 mg/kg/day). At the end of 14 weeks, all animals were euthanasiad, and heart and skin tissue were harvested for further analysis. Canagliflozin at both 1 and 3 mg/kg was successful in reducing the levels of inflammatory mediators (TNF-alpha and IL6), reducing levels of MDA, increasing the levels of SOD, and increasing the levels of collagen-1 and elastin in skin tissue. Additionally, 3 mg/kg Canagliflozin showed a better effect compared to 1 mg/kg regarding its effect on IL6, SOD, and elastin. Histopathologically, treatment with both doses of Canagliflozin attenuates abnormalities induced by D-galactose (bizarre, irregular, and hyperchromatic nuclei). Canagliflozin exhibits potent antioxidant and anti-inflammatory effects in living organisms, effectively prevents cardiac and skin damage generated by D-galactose, and possibly reduces aging.
canagliflozin, inflammation, oxidative stress, mice, aging, d-galactose
Aging refers to the progressive decline of the physiological functions essential for survival and reproductive capability over time. Natural aging differs from age-related disorders like cancer and heart disease (
The aging process is marked by widespread and long-term inflammation (
Many internal and external mechanisms generate reactive oxygen and nitrogen species (RONS), and antioxidant defenses counteract their detrimental impacts; the oxidative stress theory of aging states that age-related declines in function result from the buildup of damages caused by RONS (
An innovative and promising strategy involves repurposing clinically approved medications easily accessible as dietary supplements. Several type 2 diabetes medications have become more popular for their ability to postpone the aging process by regulating glucose metabolism and insulin action (
Despite these promising results in male mice, the exact molecular mechanism of CAG as an anti-aging drug is unclear. We undertook this study to shed light on some of the molecular mechanisms of aging, specifically the inflammatory and oxidative stress mechanisms in heart tissue and changes in elastin and collagen in skin tissue. The study aims to examine the effect of CAG as an anti-aging drug in animal models.
A group of male Swiss albino mice were selected for the study. The mice had a mean body weight range of 20–40 g and an age range of 3–7 months. They were randomly divided into five groups, each containing 10 mice housed in separate cages. In total, 50 mice were used in the study, as shown in Table
Induction a | Intervention | Time | |
---|---|---|---|
G1 ( |
-ve | Normal saline | 14 weeks |
G2 ( |
+ve | Normal saline | 14 weeks |
G3 ( |
+ve | Vitamin C (100 mg/kg/day) | 14 weeks |
G4 ( |
+ve | Canagliflozin (3 mg/kg/day) | 14 weeks |
G5 ( |
+ve | Canagliflozin (1 mg/kg/day) | 14 weeks |
The animal was allocated using block design (see Table
Induction of aging was done using D-galactose (Sigma Aldrich®, USA) at 200 mg/kg/day for seven weeks (
Following the completion of the treatment intervention, euthanasia was performed on every animal after 14 weeks. All of them completed a 10-hour fast. Afterwards, the subjects received intraperitoneal (IP) anesthesia with a dose of 80 mg/kg of ketamine and 10 mg/kg of xylazine. Following the administration of full anesthesia, the mice were euthanized employing carbon dioxide (
After applying phosphate-buffered saline (PBS) with a pH of 7.4, histological investigation was performed on heart tissue. Subsequently, the conventional processing methodology utilizes the paraffin-embedded technique (
The collected tissue was pulverized using an electric tissue homogenizer device (Staruar®, England). The homogenate was centrifuged using a Thermos Scientific® centrifuge from the USA at a temperature of four degrees Celsius and a speed of 2000 revolutions per minute for 20 minutes. The aqueous fraction was collected using a micropipette and stored at -20 °C until the analysis day.
In the ELISA procedure, 50 milligrams of tissue were placed in an Eppendorf tube from Eppendorf®, Germany, with 0.45 milliliters of cold PBS. Afterward, the tissue was carefully cut into extremely little pieces.
A double-sandwich ELISA method (Cortez Diagnostics®, USA) was used for biochemical testing. ELISA is used to measure the levels of tumor necrosis factor-alpha (TNF-ɑ), interleukin-6 (IL-6), glutathione peroxidase (SOD), malondialdehyde (MDA), collagen I (Col-I), and elastin (ELN) using specific ELISA kits (MyBioSource, USA).
The histopathologist analyzed cardiac tissue using the H&E stain and observed the structure of the heart’s myocytes using a light microscope (Olympus BX51 Microscope, Olympus Corporation®, Japan). Random inspections were conducted in five regions of a slide corner and the middle area, using a magnification power of X40.
The study was approved by the research ethical committee of the Al-Mustafa University College (ID: AP018, date: 11 November 2023).
All analyses were carried out by MedCalc version 14 (Ostend, Belgium). The continuous variables were compared using ANOVA analysis, and each pair was compared using the post hoc Tukey test. The level of significance was 0.05.
Mice induced by D-galactose (G2) showed significantly higher levels of inflammatory mediators (TNF-alpha and IL-6) than the normal control group (G1), indicating successful induction. In mice treated with CAG at 1 and 3 mg/kg per day and vitamin C (positive control), inflammatory mediators’ levels were statistically low compared to the induction group. Furthermore, the levels of IL-6 were significantly lower in mice treated with CAG at a dose of 3 mg/kg compared to those treated with 1 mg/kg, as illustrated by Fig.
Mice induced by D-galactose showed significantly higher levels of MDA than the normal control group, indicating successful induction. In mice treated with CAG at 1 and 3 mg/kg per day and vitamin C (positive control), the MDA levels were statistically low compared to the induction group, as illustrated by Fig.
In mice treated with CAG at both 1 and 3 mg/kg per day and vitamin C (positive control), the levels of SOD were significantly higher compared to the induction group. The levels of SOD were significantly higher in mice treated with CAG at a dose of 3 mg/kg compared to those treated with 1 mg/kg, as illustrated by Fig.
Mice induced by D-galactose showed significantly lower levels of collagen-1 and elastin than the normal control group, indicating successful induction. In mice treated with CAG at both 1 and 3 mg/kg per day and vitamin C (positive control), the levels of collagen-1 and elastin were statistically higher compared to the induction group. Furthermore, elastin levels were significantly higher in mice treated with CAG at a dose of 3 mg/kg than those treated with 1 mg/kg, as illustrated by Fig.
Fig.
Light microscope histopathological images of hematoxylin- and eosin-stained cardiac tissue. A. G1: no treatment; B. G2: induction group; C. G5: 1 mg/kg canagliflozin, and D. G4: 3 mg/kg canagliflozin. The black arrow indicates normal cardiac cells and normal nuclei, and the blue arrow indicates bizarre, irregular, and hyperchromatic nuclei. X40.
Our study showed for the first time that CAG protects against D-galactose-induced oxidative and inflammatory damage in mice’s heart and skin tissue, possibly indicating its anti-aging potential. CAG was successful in reducing the levels of oxidative stress and inflammatory markers and improving skin elastin and collagen levels.
At the biological level, the process of aging is attributed to the effects of the gradual accumulation of diverse forms of molecular and cellular damage over an extended period. Consequently, there is a progressive decline in both physical and mental capabilities, an escalating susceptibility to illnesses, and, finally, mortality (
In the present study, D-Gal induced an aging process in mice; it increased the inflammatory mediator’s levels in heart tissues, including TNFα and IL6, and also increased oxidative stress markers in the heart, including MDA, while decreasing antioxidant enzyme levels, including SOD; furthermore, it decreased COL-I and ELN levels in skin tissues and induced hypertrophy of cardiac cells. D-Gal-induced cardiac aging models have been shown in several investigations to result in increased ventricular hypertrophy and cardiac inflammatory cells (
In the present study, levels of TNFα and IL6 in heart tissue were significantly reduced in animals given CAG at both doses compared to the induction group; additionally, it appears that 3 mg/kg CAG showed a more beneficial reduction of IL6 level compared to 1 mg/kg. These outcomes prove that SGLT2 inhibitors may have broader antioxidant and anti-inflammatory effects across the body and specific effects on heart tissue. The main mechanism by which canagliflozin acts as an antidiabetic is by inhibiting glucose reabsorption through the blockage of SGLT2. This glucose transporter is predominantly found in the kidneys and intestines but not in other tissues like the heart (
Hasan et al. investigated the protective effect of CAG in heart tissue against oxidative stress induced by isoprenaline in Long-Evans rat hearts; CAG attenuates oxidative stress and apoptotic processes, which was achieved by lowering the effect of nitric oxide synthase, transforming growth factor beta, and caspase-3, which are all involved in promoting oxidative stress, inflammation, and cell death (
One of the most significant alterations with age is a dysregulation of the immune response that results in a chronic systemic state of inflammation. Cytokines and chemokines are two examples of dysregulated proinflammatory mediators that play a significant role in the onset of chronic inflammation and immunosenescence (
In the present study, the levels of MDA and SOD were improved with treatment with CAG at both doses; moreover, 3 mg/kg showed better results for SOD compared to 1 mg/kg. SGLT2 inhibitors function as indirect antioxidants by reducing oxidative damage caused by elevated glucose levels. Furthermore, studies have demonstrated that SGLT2 inhibitors effectively decrease the production of free radicals (
Our research indicates that canagliflozin is involved in numerous pathways for antioxidant and anti-inflammatory effects. Therefore, it is possible that other molecular processes, apart from the ones mentioned above, contribute to the cardioprotective effects of canagliflozin. Due to the consistent connection between diabetes and oxidative stress and inflammation in the cardiovascular system, we utilized a model of induced cardiac oxidative stress and aging to examine the antioxidant capabilities of canagliflozin. This approach allowed us to focus solely on the effects of canagliflozin without any interference from other diabetes-related mechanisms. Hence, further investigations using diabetic animal models are necessary to fully comprehend the therapeutic capabilities of this medication concerning oxidative stress and organ damage caused by D-galactose.
Our research revealed that canagliflozin exhibits potent antioxidant and anti-inflammatory effects in living organisms, effectively prevents cardiac and skin damage generated by D-galactose, and possibly reduces aging. These actions may entail various pathways beyond localized actions in the heart and have broad systemic effects.