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284 Herbal Pharmacopeia
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Herbal Medicine and
13
Neurological Diseases
Sunil Kumar Kadiri and Prashant Tiwari
Department of Pharmacology, College of Pharmaceutical Sciences,
Dayananda Sagar University, Bengaluru, India
Samaresh Pal Roy
Department of Pharmacology, Sardar Patel College of Pharmacy,
Vidyanagar, Gujarat, India
Suchismita Bhowmik
Department of Community Health Nursing, Manikaka Topawala Institute
of Nursing, Charotar University of Science and Technology, Changa,
Gujarat, India
13.1 INTRODUCTION TO HERBAL MEDICINE AND NEUROLOGICAL DISEASES
Herbal medicine has been traditionally utilized for centuries across diverse cultures to address a
wide assortment of health conditions [1]. The employment of plants and plant- derived substances
has coevolved alongside conventional medicine, offering choice or complementary alternatives for
managing diseases, like those impacting the neurological system. Neurological afictions encompass an expansive spectrum of disorders inuencing the brain, spinal cord, and peripheral nerves
[2–4]. These circumstances can vary from neurodegenerative maladies such as Alzheimer’s and
Parkinson’s to neurological issues – for example epilepsy, migraines, and multiple sclerosis [5].
Standard treatments regularly involve pharmaceuticals targeting symptoms or slowing the progression of these diseases. Nevertheless, these treatments may come with side effects, leading numerous
patients and healthcare providers to explore herbal remedies as supplementary or substitute therapies
[6–8]. Herbs such as Ginkgo biloba, St. John’s Wort, and Valerian root have been researched for their
potential neuroprotective impacts and their ability to improve cognitive function, mood, and sleep.
Ginkgo biloba, for instance, is believed to enhance cognitive function by boosting blood circulation
in the brain, while St. John’s Wort is commonly utilized for its antidepressant impacts. The therapeutic possibility of herbal medicine in neurological diseases lies in the intricate interplay of various active substances found in plants. These compounds may offer antioxidant, anti- inammatory,
and neuroprotective consequences, which are crucial in managing the oxidative stress and swelling
that are frequently related to neurological conditions [9]. Despite the promising impacts of herbal
medicine, it is essential to approach its employment with caution. The efcacy of many herbal remedies is still under investigation, and their interactions with conventional medications are not fully
comprehended [10]. Additionally, the standardization of herbal products and the variability in their
active components pose substantial challenges to their consistent use in clinical settings.
As interest in herbal medicine continues to grow, further research is necessary to establish the
safety, efcacy, and mechanisms of action of these natural treatments in the context of neurological
diseases. Healthcare providers should be informed about the potential benets and risks of herbal
therapies to guide patients in making well- informed decisions about their treatment options [11].
287
288 Herbal Pharmacopeia
13.1.1 Overview Of Herbal Medicine
Herbal medicine, also known as phytotherapy, involves harnessing nature’s healing gifts from plants
and their extracts for therapeutic purposes. It has been practiced for millennia across diverse cultures
and remains integral to systems like Ayurveda, traditional Chinese medicine (TCM), and Native
American healing practices [12].
13.1.1.1 Key Aspects of Herbal Medicine
Plant sources provide remedies as fresh, dried, or extracted leaves, roots, owers, bark, seeds, and
fruits [13]. Active compounds confer benets through alkaloids, avonoids, terpenes, and glycosides working anti- inammatory, antimicrobial, antioxidant, and immune- modulating effects.
Herbal medicine often adopts a holistic stance to health, focusing on equilibrium of body, mind, and
spirit. It considers an individual’s overall wellness, rather than solely treating symptoms [14–18].
Commonly used herbs include: immune- bolstering Echinacea reducing cold duration; St.
John’s Wort, which has anti- depressant and mood- stabilizing actions; energy- enhancing,
cognitive- function- boosting ginseng; and anti- inammatory, antioxidant turmeric (Figure
13.1). Similarly, peppermint frequently eases digestion and headaches.
Safety and efcacy matter: while many herbs are safe with proper use, some may interact
dangerously with medications or cause side effects. Seek qualied guidance, especially
with regard to health issues or other medications. Modern integration increasingly merges
herbal medicine into mainstream care as complementary therapies alongside conventional
treatments. This stimulated scientic research into various remedies’ effectiveness and
risks. Regulation varies between designating herbal medicines as dietary supplements or
classifying some as drugs requiring stricter testing and approval [19]. Herbal medicine continues valuably blending antiquity’s wisdom with modern science for health and wellness.
13.1.2 ScOpe Of neurOlOgical diSeaSeS
Neurological diseases encompass a broad spectrum of disorders that affect the brain, spinal cord,
and peripheral nervous system. These conditions can range from common ailments like migraines
and epilepsy to more complex and debilitating diseases such as Alzheimer’s, Parkinson’s, multiple
FIGURE 13.1 Some prominent herbs with Medicinal properties.
Herbal Medicine and Neurological Diseases 289
sclerosis, and the motor neuron disease known as amyotrophic lateral sclerosis [20]. The scope of
neurological diseases is vast due to the immense complexity of the human nervous system, which
intricately controls and coordinates each and every one of the body’s innumerable functions [21].
These diseases hold the potential to impact motor skills, sensory awareness, cognition, behavior, and
autonomic functions. Genetic predispositions, environmental exposures, infectious agents, physical
traumas, or even etiologies that remain unknown – any of these triggers may underlie the origins
of specic neurological disorders [22]. Treating and managing neurological diseases frequently
demands an interdisciplinary clinical strategy, incorporating pharmaceutical interventions, physical
and occupational therapies, psychological support services, and, in some cases, surgical options.
Continual advances in scientic research serve to expand our fundamental understanding of these
conditions, leading to enhanced diagnostic techniques, rened treatment protocols, and, in a few
instances, even prospective preventative measures.
13.1.3 ratiOnale fOr explOring Herbal reMedieS
Exploring herbal remedies is a tradition rooted in humanity’s innate drive to heal itself through
natural means whenever possible. This pursuit of gentler options includes several compelling rationales [23]. The long cultural pedigree of many plants’ medical usages, as generations shared which
species soothed what suffering. That enduring ethnobotanical paper trail hints some herbs warrant
careful studies into whether tradition translates to treatment. Herbs are widely perceived as wielding
fewer potential side effects than manufactured pharmaceuticals, a quality valued by those navigating
delicate conditions or desiring delicate approaches [24–29]. Gentleness also means gentler remedies
may complement conventions where those fall short. Herbalism often sees the person, rather than
just the pathology, prioritizing overall wellness – a perspective increasingly popular as prevention,
not just reaction, gains favor. Treating the whole being aligns with this holistic health model.
Bacteria’s accelerating resistance and the downsides of long- term medication lead to an urgent
need for alternatives. Nature’s plants, whose compounds work in complex concert, may offer novel
ways to manage persistent infections and persistent patients [30].
Modern technology enables scientists to extract and analyze the active elements of herbs, providing valuable insights that can be applied to other elds such as medicine research and supplement
formulation. This scientic validation has the potential to greatly enhance accessibility.
Herbal medicines are often more economically efcient and environmentally sensitive, which is
particularly important when infrastructure is unreliable. Botanical medicine can be a crucial solution
for populations that have limited access to healthcare services [31–33].
Although herbalism shows promise, it is crucial to prioritize rigorous study in order to establish
the safety, effectiveness, and consistent benets of medicines.
13.2 NEUROPROTECTIVE EFFECTS OF HERBAL COMPOUNDS
Neuroprotective properties of herbal compounds pertain to the capacity of specic molecules produced from plants to shield brain cells (neurons) against harm, deterioration, or demise [34]. The
impact of these consequences is highly important in the context of neurological disorders such
as Alzheimer’s, Parkinson’s, stroke, and multiple sclerosis. In these conditions, oxidative stress,
inammation, and excitotoxicity play a crucial role in causing damage to neurons.
13.2.1 MecHaniSMS Of neurOprOtectiOn
13.2.1.1 Antioxidant Activity
Compounds abundant in antioxidants, such as curcumin from turmeric and the avonoids found in
an assortment of fruits and vegetables, have demonstrated an ability to shelter neurons by scavenging
damaging free radicals, which balances oxidative stress, a principal factor in neurodegeneration. Many
plant extracts contain antioxidants that counteract free radicals and decrease oxidative stress [35–39].
290 Herbal Pharmacopeia
FIGURE 13.2 Potential mechanism of action of medicinal herbs.
13.2.1.2 Anti- inammatory Properties
Persistent irritation within the mind is a hallmark of many neurological issues. Certain herbal
extracts, including resveratrol present in grapes and ginsenosides discovered in ginseng, exhibit
anti- inammatory results through inhibiting the manufacturing of pro- inammatory cytokines and
modulating immune responses, thereby decreasing neuronal injury [40]. Herbal compounds have
also been proven to curb inammation in the mind, a hallmark of neurological issues (Figure 13.2).
13.2.1.3 Inhibition of Excitotoxicity
Excitotoxicity occurs when neurons are excessively stimulated by neurotransmitters such as glutamate, leading to cellular damage and death. Certain herbs include chemicals that can help control
neurotransmitter levels, thereby reducing excitotoxic damage. For instance, Ginkgo biloba has components that help regulate neurotransmitter levels [41].
13.2.1.4 Enhancement of Neurogenesis and Synaptic Plasticity
Herbal extracts with positive effects promote the formation of new neurons, a process called neurogenesis, and enhance synaptic plasticity, which is crucial for learning, memory, and overall brain
function. An example is the presence of bacosides in Bacopa monnieri, which have been examined
for their capacity to improve cognitive functions by promoting neurogenesis and synaptic communication [42–49].
13.2.1.5 Mitochondrial Protection
Neurodegenerative disorders have a particular impact on mitochondria, which are the cellular
powerhouses responsible for generating energy. Research indicates that herbal substances such as
Herbal Medicine and Neurological Diseases 291
berberine found in goldenseal and quercetin found in various fruits and vegetables have the capacity
to enhance mitochondrial activity and protect against energy deciencies in neurons.
13.2.2 rOle Of Oxidative StreSS in neurOlOgical diSeaSeS
Oxidative stress is a pivotal factor in the initiation and advancement of several neurological disorders. It arises from a disparity between the generation of reactive oxygen species (ROS) and the
body’s capacity to counteract them with antioxidants [50]. This imbalance results in the buildup of
reactive oxygen species (ROS), which can harm cellular structures, including DNA, proteins, and
lipids. Neurons, in particular, are prone to oxidative damage because of their high oxygen consumption and inadequate antioxidant defenses.
13.2.2.1 Essential Components of Oxidative Stress in Neurological Disorders
13.2.2.1.1 Impaired Functioning of Mitochondria
Neurons are highly dependent on mitochondria for their energy needs. Oxidative stress- induced
damage to mitochondria results in decreased energy production and further amplies the creation
of reactive oxygen species (ROS), establishing a detrimental loop of damage that contributes to
dementia. Oxidative stress has the potential to induce genetic mutations in DNA and alter proteins,
thereby interfering with their regular functioning. This damage might result in cellular impairment
and demise, hence exacerbating the advancement of neurological disorders [51–54]. Lipid peroxidation occurs when ROS target and damage lipids found in cell membranes, especially in the brain
where there is a high concentration of polyunsaturated fatty acids. Lipid peroxidation is the process
that causes damage to the cell membrane, resulting in the loss of cell integrity and ultimately leading
to the death of neurons.
13.2.2.1.2 Neurological Disorders Linked to Oxidative Stress
Alzheimer’s disease: Oxidative stress has a role in the development of beta- amyloid plaques and tau
tangles, which are characteristic features of Alzheimer’s disease and are linked to the loss of neurons
and deterioration in cognitive function.
Parkinson's disease: Oxidative stress contributes to the deterioration of dopaminergic neurons
in the substantia nigra in Parkinson’s disease, primarily as a result of the oxidative breakdown of dopamine [55].
Amyotrophic lateral sclerosis (ALS): The breakdown of motor neurons is associated with oxi-
dative stress, in which mutations in antioxidant enzymes such as superoxide dismutase 1
(SOD1) have a notable impact.
Multiple sclerosis (MS): Oxidative stress worsens inammation and demyelination in MS,
causing additional harm to neurons and advancing the disease.
Stroke: The occurrence of a stroke leads to a signicant increase in ROS due to the damage
caused by the interruption and restoration of blood ow. This surge in ROS results in substantial damage to the neurons, which worsens the severity of the injury [56].
Therapeutic implications: The comprehension of oxidative stress in neurological disorders
has generated curiosity in antioxidant treatments designed to diminish oxidative harm and
decelerate the advancement of the condition. Nevertheless, the intricate nature of oxidative stress pathways in the brain poses difculties, necessitating further research to devise
efcacious treatments.
13.2.3 anti- inflaMMatOry prOpertieS Of Herbal cOMpOundS
The varied anti- inammatory capacities of herbal substances have long been acknowledged for their
notable part in managing and forestalling diverse inammatory issues, including those impacting
292 Herbal Pharmacopeia
the sensory system [57]. These chemicals can impede irritation through different instruments, giving
a common elective or expansion to conventional anti- inammatory medications.
13.2.3.1 Anti- Inammatory Activity Systems
Suppression of pro- inammatory cytokines: Certain herbs like curcumin derived from turmeric
and resveratrol found in grapes have appeared capable of diminishing the combination of proinammatory cytokines like TNF- α, IL- 1β, and IL- 6. By suppressing these signaling particles, they
help in diminishing cellular irritation [58].
The NF- κB pathway plays a key job in controlling the inammatory reaction. A few herbal sub-
stances, like gingerol found in ginger and epigallocatechin gallate (EGCG) from green tea, have the
capacity to block the initiation of NF- κB, bringing about a decrease in the articulation of qualities
related with swelling.
Antioxidant effects: Oxidative pressure and aggravation are rmly intertwined, as responsive
oxygen types (ROS) frequently start inammatory pathways. Herbal substances containing intense antioxidants, like quercetin present in different natural products and vegetables and avonoids, help in diminishing oxidative pressure, subsequently diminishing
irritation.
Suppression of COX and LOX enzymes: The inammatory process is impacted by the creation
of pro- inammatory mediators, for example, prostaglandins and leukotrienes, which are
created by enzymes called cyclooxygenase (COX) and lipoxygenase (LOX) [59]. Blends
like boswellic corrosive, obtained from frankincense, and salicin, extracted from willow
bark, have the capacity to impede these enzymes, along these lines diminishing irritation.
Immune system modulation: Certain herbs have an inherent ability to govern the immune reac-
tion by upholding equilibrium between pro- and anti- inammatory signals. For example,
ginsenosides derived from ginseng and complex sugars obtained from fungi such as reishi
have the potential to better immunological regulation, thereby facilitating a more balanced
inammatory feedback.
13.2.3.2 Uses and Advantages
Chronic Inammatory Illnesses: Herbal anti- inammatory agents are commonly applied to
manage persistent inammatory conditions – for example, rheumatoid arthritis, inammatory bowel disease, and asthma [60–64]. They have the possibility to diminish the necessity
for the extended application of standard anti- inammatory medications, which can result
in notable adverse effects.
Neurological Disorders: Inammation plays a crucial part in neurodegenerative diseases
such as Alzheimer’s, Parkinson’s, and multiple sclerosis. Herbal ingredients with antiinammatory qualities own the ability to retard the progression of illnesses and provide relief
from symptoms. Herbal compounds are often employed to treat inammatory skin disorders, such as eczema, psoriasis, and dermatitis, due to their relaxing and anti- inammatory
properties.
Cardiovascular Health: Enduring inammation notably contributes to the evolution of car-
diovascular sicknesses. Herbal ingredients possess the ability to mitigate inammation in
blood vessels, hence decreasing the prospect of atherosclerosis and related ailments.
The therapeutic potential of herbal components is substantiated by both ancestral usage and modern
scientic investigation, owing to their anti- inammatory traits. Although they have possible healing
benets, it is crucial to approach their application with an appreciation of suitable dosage, potential
interactions with other medications, and the necessity for extra analysis to substantiate effectiveness
and safety in specic circumstances.
Herbal Medicine and Neurological Diseases 293
13.2.4 regulatiOn Of neurOnal apOptOSiS by Herbal reMedieS
Promising research has also been carried out on the ability of certain herbal remedies to regulate
neuronal apoptosis (programmed cell death) in respect of neurodegenerative diseases where excessive or dysregulated apoptosis plays a part in the attrition of neurons [65]. Indeed, some herbal compounds have been found to positively modulate apoptotic pathways, leading to neuronal survival,
and may be useful for promoting brain health (Figure 13.3).
For example, herbal compounds such as curcumin (from turmeric) and ginsenosides (ginseng)
are found to inhibit pro- apoptotic proteins such as Bax, caspases, cytochrome c which, upon inhibition, reduce the markers of the apoptosis pathway, and hence prohibiting triggering an event to
prevent the death of neurons.
Activation of Anti- apoptotic Pathways: Some herbal remedies increase the levels of anti-
apoptotic proteins such as Bcl- 2 (together with decreasing, for example, Bak), which stabilize mitochondria and inhibit apoptosis signals. Compounds like resveratrol (found in
grapes) and epigallocatechin gallate, or EGCG for short (from green tea), have been shown
to turn on these protective pathways.
Reducing Oxidative Stress: In the brain, one of the main stimulants for neuronal apoptosis is
oxidative stress. The strong antioxidant properties of some herbal compounds like quercetin, avonoids neutralize the ROS and thus reduced oxidative damage preventing apoptosis.
Modulation of Signaling Pathways: Herbal compounds can modulate important signaling
pathways responsible for apoptosis, e.g., MAPK/ERK pathway, PI3/Akt and JNK. For
example, various phytochemicals (baicalin from Sc), and honokiol (from Mo) were shown
to act on this pathway protecting neurons by activation of survival genes and preventing the
induction of death cell osteosis [66–68].
FIGURE 13.3 Mechanisms involved in the regulation of neuronal apoptosis by herbal medicines.