Many of the pharmaceuticals currently available to physicians have a long history of use as herbal remedies, including opium, aspirin, digitalis, and quinine. The World Health Organization (WHO) estimates that 80 percent of the world's population presently uses herbal medicine for some aspect of primary health care (Rossi et al., 2008). Herbal medicine is a major component in all traditional medicine systems and a common element in Ayurvedic, homeopathic, naturopathic, traditional Chinese medicine, and Native American medicine. According to WHO, 74% of 119 modern plant-derived pharmaceutical medicines are used in ways that are similar to their traditional uses.
Table of Contents
1. Introduction
2. Aminoglycosides
3. Gentamicin
3.1 Structure and Uses
3.2 Mode of Action as an Antibacterial
3.3 Adverse Effects of Gentamicin
3.4 Understanding Gentamicin - Induced Nephrotoxicity
3.5 Binding and Uptake of Gentamicin to Proximal Tubular Cells
3.6 Strategies to mitigate gentamicin - induced toxicity
4. Medicinal plants
5. Herbal medicine
6. Scenario in India
7. Anti-nephrotoxic plants
8. Scope of the Present Investigation
9. Morinda citrifolia
10. Evaluation of LD50
10.1 Introduction
10.2 Materials and Methods
10.3 Results and Discussion
10.4 Summary and Conclusion
11. Invitro Antioxidant Studies of Morinda citrifolia
11.1 Introduction
11.2 Materials and Methods
11.3 Results and Discussion
11.4 Summary and Conclusion
12. Lipid Peroxidative Studies
12.1 Introduction
12.2 Materials and Methods
12.3 Methods
12.4 Summary and Conclusion
Research Objective and Core Topics
The primary research objective of this investigation is to evaluate the therapeutic potential and nephroprotective efficacy of Morinda citrifolia against gentamicin-induced kidney toxicity, focusing on its antioxidant properties and metabolic regulation in rats.
- Acute toxicity evaluation (LD50) of Morinda citrifolia extracts.
- In-vitro antioxidant activity analysis using various biochemical assays.
- Investigation of lipid peroxidation markers in the kidney.
- Assessment of tissue antioxidant enzymes and glutathione cycle dynamics.
- Evaluation of plasma lipid profiles and lipoprotein changes under treatment.
Auszug aus dem Buch
Binding and Uptake of Gentamicin to Proximal Tubular Cells
The interaction between the aminoglycoside - gentamicin and the brush border membrane of the renal proximal convoluted tubules have been described in rats (Hirode et al., 2008) and in rabbits (Hancock et al., 2005). Gentamicin is polybasic due to their side chains containing amino groups and thus is polycationic at physiological pH. Hence the acidic anionic phospholipids of the plasma membrane are prime targets for the charge interaction with the gentamicin (Baronas et al., 2007). Several lines of evidence indicate, particularly phosphoinositides like phosphoinositol (PT), phosphatidylinositol - 4, 5-biphosphate (PI-P2), to be an integral component of the gentamicin binding sites. Of the phosphoinositides, PI-P2 has been shown to have the highest binding affinity for gentamicin followed by PIP and PI (Ogwan et al., 1993). The binding of the drug to the receptor is followed by pinocytosis of the drug-receptor complex with subsequent translocation of the complex to secondary lysosomes. Within the lysosomes, gentamicin might interfere with the catabolism of the receptor by directly inhibiting phospholipase A and C or by modifying substrate – enzyme affinity or by raising the intralysosomal pH above the effective range of the enzyme.
Summary of Chapters
Introduction: Provides a background on the medical utility of Morinda citrifolia and the challenge of gentamicin-induced nephrotoxicity.
Aminoglycosides: Discusses the pharmacological classification, structure, and clinical importance of aminoglycoside antibiotics.
Gentamicin: Details the chemical structure, mechanism of action, and the clinical problem of nephrotoxicity associated with gentamicin.
Medicinal plants: Reviews the role of plants in traditional healthcare and their historical medicinal significance.
Herbal medicine: Explores the universal use of plants for disease treatment and their integration into modern pharmacological research.
Scenario in India: Summarizes the biodiversity and status of medicinal plant usage in India.
Anti-nephrotoxic plants: Examines how different cultural groups utilize plant properties to balance and maintain health, specifically focusing on protection against organ damage.
Scope of the Present Investigation: Outlines the research focus on mitigating gentamicin nephrotoxicity using specific extracts.
Morinda citrifolia: Describes the taxonomic classification, habitat, and traditional uses of this specific plant.
Evaluation of LD50: Documents the acute toxicity testing performed on rats to determine safety margins.
Invitro Antioxidant Studies of Morinda citrifolia: Describes the methodology and results of testing the antioxidant potency of plant extracts.
Lipid Peroxidative Studies: Investigates the mechanism of gentamicin-induced renal damage through lipid peroxidation and the protective antioxidant defense enzymes.
Keywords
Morinda citrifolia, Gentamicin, Nephrotoxicity, Oxidative stress, Lipid peroxidation, Antioxidant, Glutathione, Proximal tubule, Renal function, Pharmacopoeia, Phytochemicals, Lipid profile, Lipoproteins, Enzymatic activity, Traditional medicine.
Frequently Asked Questions
What is the core focus of this research study?
The study investigates the potential of Morinda citrifolia to act as a nephroprotective agent against toxicity induced by the antibiotic gentamicin in rats.
What are the primary themes discussed in the work?
The key themes include the mechanism of gentamicin-induced kidney injury, the role of lipid peroxidation in renal toxicity, and the efficacy of antioxidant-rich botanical extracts in neutralizing oxidative damage.
What is the primary objective of this investigation?
The goal is to determine the therapeutic efficacy of Morinda citrifolia extracts by assessing their impact on cellular metabolism and antioxidant defense mechanisms in a nephrotoxic model.
Which scientific methods are utilized in the study?
The research employs a mix of in-vivo acute toxicity tests, in-vitro antioxidant assays (such as DPPH, FRAP, and hydroxyl radical scavenging), and biochemical quantification of lipid markers and enzymes in kidney tissues.
What does the main body of the research address?
The main body focuses on the experimental procedures, the metabolic processes involved in gentamicin uptake in renal cells, and the resulting biochemical data on antioxidant status and lipid profiles.
Which keywords best characterize this research?
Key terms include nephrotoxicity, Morinda citrifolia, oxidative stress, gentamicin, antioxidant defense, and lipid peroxidation.
How does gentamicin cause damage in the kidney?
Gentamicin accumulates in the proximal tubular cells, binding to anionic phospholipids, which initiates a two-step process leading to functional alterations, oxidative stress, and eventual tubular cell necrosis.
What role does Morinda citrifolia play in this context?
The plant extracts are shown to have membrane-stabilizing abilities and significant free radical quenching properties, which help restore the antioxidant balance in the kidneys of treated rats.
What was the outcome of the acute toxicity testing?
The acute toxicity study demonstrated that Morinda citrifolia extracts are safe at dose levels of up to 2000 mg/kg body weight, showing no significant toxic symptoms or mortality in the animal subjects.
What findings were observed regarding lipid profiles?
Gentamicin administration led to elevated total cholesterol and triglycerides, while the administration of Morinda citrifolia helped revert these lipid profiles toward near-normal levels.
- Quote paper
- Anitha Thiyagarajan (Author), 2009, Indian mulberry (Morinda citrifolia, Rubiaceae), Munich, GRIN Verlag, https://www.hausarbeiten.de/document/201756
