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activities and chemical structures, which have a wide range of applications in medicine, agriculture, and industry. Furthermore, the study of natural products from endophytic microorganisms has provided valuable insights into the ecological significance of these microbes in plant-microbe interactions, as well as their potential for sustainable and eco-friendly agriculture.
The investigation of natural products derived from endophytic microorganisms is a dynamic and rapidly evolving area of research that holds great promise for addressing
various societal challenges. The continued exploration and exploitation of this eld will
require interdisciplinary collaborations, innovative technologies, and sustainable practices
that consider both the scientic and societal aspects of natural product research and
development.
KEYWORDS
• endophytic microorganisms
• natural products
• endophytic microorganisms
• endophytic fungi
• coculture

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CHAPTER 12

Natural Products with Antidiabetic Properties

KANCHAN SINGH
 
ABSTRACT
Diabetes mellitus (DM) is a medical illness that causes high blood glucose levels, changes in lipid, carbohydrate, and protein metabolism, and, over time, issues affecting the eyes, kidneys, cardiovascular system, and neurological system. Numerous plant species from various geographical places have been investigated for their possible antidiabetic effects. It is predicted that by 2030, one-third of the global population will be diabetic. While there are several synthetic medications available on the market to treat DM, long-term use of these drugs may result in the development of serious negative effects. Medicinal plants are employed as a source of traditional medicine by around 60% of the world’s population. DM is treated with a broad variety of plants in the Indian medicinal system, as in other traditional medical systems around the world. Many herbal remedies help to reduce blood glucose levels. There is currently a rising interest in investigating these botanical extracts for potential compounds that could be beneficial in therapeutic situations or that could
elicit unique effects, such as the stimulation of β-cell proliferation. Due to the common
lack of knowledge regarding the extraction methods employed for the active constituents of these drugs, novel mechanisms, and compounds may potentially be unveiled.
*
*Corresponding author

12.1 INTRODUCTION

Diabetes mellitus (DM) is an endocrine disorder that is not caused by infectious agents. It is characterized by disruptions in carbohydrate metabolism and is often associated with hyperglycemia (Kumar et al., 2013). The development of several severe diseases, including microvascular complications (nephropathy, retinopathy, and neuropathy) and macrovas­cular complications (peripheral vascular disease and coronary heart disease), has been associated with this condition (Upendra Rao et al., 2010). According to recent statistics from the International Diabetes Federation and World Health Organization, the prevalence of DM has reached a significant number of 246 million individuals globally. Among those affected, 46% fall within the age range of 40–59 years, which are considered as their most
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economically productive years. It is projected that this number will rise to a minimum of 380 million by the year 2025 (Sarah et al., 2004). The endocrine function of the pancreas entails the secretion of insulin and glucagon, which are essential for regulating blood glucose levels. The secretion of insulin is mediated by islet beta cells and is triggered by an increase in blood glucose levels. These cells are exclusively responsible for producing insulin. Anabolic insulin is responsible for regulating the metabolic processes of glucose, lipid, and protein. The receptors of muscle, liver, and fat cells are bound with insulin. The reduction of blood glucose levels is achieved through the elevation of glucose absorption by peripheral insulin-sensitive cells. The aforementioned action leads to an enhancement in liver glycogenesis and a reduction in pancreatic alpha-cell glucagon secretion, thereby inhibiting hepatic glucose synthesis through glycogenolysis and gluconeogenesis (Wojcik
et al., 2018). Pancreatic α cells secrete glucagon, a catabolic hormone that counteracts
insulin when blood glucose levels decrease during physical activity or in the intervals between meals. Glucagon facilitates the process of hepatic and muscular glucose mobiliza­tion to sustain the levels of glucose in the bloodstream during periods of fasting (Klein et al., 1996). Combination therapies are frequently employed to reduce adverse effects and enhance effectiveness. Examples include the use of sulfonylureas in conjunction with bigu­anides, as well as thiazolidinedione in combination with glucosidase inhibitors. Synthetic drugs are associated with several adverse effects, including hypoglycemia at elevated dosages, diarrhea, lactic acidosis, and hepatic complications (Gupta et al., 2017). The utili­zation of antidiabetic compounds derived from natural sources presents a promising option for the management of diabetes, owing to their favorable attributes such as safety , ef ficacy, accessibility, and cost-effectiveness. Furthermore, the herbal mechanism of action has the potential to rectify metabolic irregularities and postpone the onset of diabetic complica­tions. Metformin, which is the primary treatment option for type 2 DM, was extracted from the French lilac plant known as Galega officinalis. This serves as supporting evidence for the aforementioned concept (Abdel Raoof and Mohamed, 2018).
This chapter is centered on the latest developments in medicinally signicant natural
compounds employed in the treatment of diabetes. The primary focus is on structure– activity investigations and the elucidation of mechanisms of action of natural products as antidiabetic agents. Over 800 plants and their bioactive compounds are known to exhibit antidiabetic properties (Li et al., 2012). This chapter will delve into contemporary advance-
ments in natural products that hold medicinal signicance in the treatment of diabetes
(Sivakumar and Deepa, 2023). The emphasis will be on the structure–activity relationship and the mechanisms of action of these products. Although antidiabetic medications have
been unable to provide a complete cure for diabetes, they have demonstrated efcacy in
mitigating diabetic complications. The antidiabetic natural products were categorized based on their respective mechanisms of action (Khan et al., 2019).

12.2 NATURAL PRODUCTS THAT REGULATE GLUCOSE ABSORPTION

This section focuses on the chemical and biological characteristics of natural compounds that
can control α-glucosidase activity. Postprandial hyperglycemia is caused by α-glucosidase,
 261
an enzyme that hydrolyzes linear and branched isomaltose oligosaccharides to release glucose.

12.2.1 SEROTONIN-DERIVED PRODUCTS

Serotonin is a monoamine neurotransmitter that is derived biochemically from tryptophan. It has been observed that animals, including humans, harbor this substance within their central nervous system, blood platelets, and gastrointestinal tract. It is also present in botanical and mycological organisms (González-Flores, 2011). It is essential for sensations of contentment (Young, 2007).
The investigations report the isolation of two distinct derivatives of serotonin, namely,
N-feruloyl serotonin and N-p-coumaroyl serotonin, from the seeds of safower (Carthamus tinctorius). The investigations demonstrated the antidiabetic effect of the tested substance
through a more signicant suppression of α-glucosidase activity in comparison to the positive control, acarbose. Safower is utilized in traditional medicine in Asian and
Korean regions to promote sweating, alleviate constipation, address physical injuries, and alleviate menstrual discomfort (T akahashi and Miyazawa, 2012). The antidiabetic potential
of safower extract was demonstrated through its ability to enhance insulin secretion in
alloxan-induced diabetic rats (Sabet et al., 2012).

12.2.2 BUTYL-ISOBUTYL-PHTHALATE FROM LAMINARIA JAPONICA

The active compound, butyl-isobutyl-phthalate, derived from Laminaria japonica, exhibited a hypoglycemic effect on mice with STZ (streptozotocin)-induced diabetes.
This effect was attributed to the inhibition of α-glucosidase activity, as demonstrated in a
laboratory investigation (Akar et al., 2011).

12.2.3 BIOACTIVE COMPOUNDS OF ALLIUM CEPA AND ALLIUM SATIVUM

Garlic, which belongs to the Liliaceae family, is scientifically referred to as A. sativum. A study has shown that garlic exhibits greater efficacy as an antidiabetic agent compared to glibenclamide, a widely recognized antidiabetic medication (Eidi et al., 2006). A recent research study indicated that the utilization of an alcoholic garlic extract resulted in a note­worthy decrease in various biomarkers including aspartate transaminase (AST), alanine transaminase (ALT), creatinine, urea, total cholesterol, serum triglycerides, and fasting blood glucose levels. Furthermore, it facilitated the standardization of the functioning of glucose-6-phosphatase and liver hexokinase (Goel et al., 2012).
Onion (Allium cepa) is a member of the family Liliaceae. Subcutaneous glucose toler­ance tests showed that onion bulb ether extract lowered blood glucose levels by lowering the peak glucose level (J.K. Grover et al., 2002). The primary active compound found
in garlic is allicin, which is accompanied by diallyl disulde. On the other hand, the primary active compound present in onions is allylpropyl disulde. The aforementioned
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compounds elicit the secretion of insulin from beta cells located in the pancreas (Yuan and
Bieber, 2003). Each of these bioactive constituents exists in the conguration of cysteine
derivatives, which undergo decomposition via the enzymatic action of allinase, resulting in
the formation of polysuldes and thiosulnates (Yuan and Bieber, 2003).

12.2.4 ELATOSIDES E AND F OF ARALIA ELATA

Elatosides E and F, identified as hypoglycemic agents, were extracted from the roots of Aralia elata (commonly known as Angelica) of the Araliaceae family. The study demon­strated a noteworthy decrease in blood glucose levels in rats through the implementation of an oral sucrose tolerance test (Puri et al., 2002). The inhibition of aldose reductase activity was discovered to be the underlying mechanism behind the antidiabetic properties of the root, which can be attributed to its biologically active compounds (Guo et al., 2004).

12.2.5 BIOACTIVE COMPOUNDS OF BAUHINIA CANDICANS AND BAUHINIA FORFICATE

The aforementioned botanical specimens are classified under the taxonomic family Caesal­piniaceae. The administration of Bauhinia forficata leaf extracts resulted in a decrease in total cholesterol, triglycerides, and serum glucose levels in rats with alloxan-induced diabetes. In addition, the flavonoid kaempferilrin was extracted from the leaves of B. forficata using butanol and found to exhibit significant antidiabetic properties in alloxan­induced diabetic rats by improving glucose metabolism (Sayago et al., 2013). The leaves of Bauhinia candicans were found to exhibit strong antidiabetic properties through the promotion of glucose metabolism, as evidenced by the powerful effects of both butanol and methanol extracts (Soares et al., 2000).

12.3 NATURAL PRODUCTS THAT ENHANCE INSULIN SENSITIVITY

12.3.1 ASTRAGALUS MEMBRANACEUS POLYSACCHARIDES

The roots of Astragalus membranaceus have exhibited various activities such as immuno­modulatory , antihypertensive, antioxidant, and antidiabetic effects (Zheng et al., 2020). The active polysaccharides present in A. membranaceus were observed to enhance glycemic control in diabetic rodents by augmenting insulin sensitivity (Zhao et al., 2012).

12.3.2 BIOACTIVE COMPOUNDS OF LITCHI CHINENSIS

The seeds of Litchi chinensis are utilized in traditional medicine to manage gastrointestinal ailments (Rajagopal and Sasikala, 2008). According to a research, it has been demonstrated that litchi seeds, containing the compound oligonol, possess a strong antidiabetic effect in