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*Corresponding Author: Jan Sudir Purba, Department of Neurology, Dr. Ciptomangunkusumo General Hospital, Faculty of Medicine, Universitas Indonesia, Jalan Diponegoro No 71, Jakarta, 10430, Indonesia.
Citation: Diatri Nari Lastri , Tiara Aninditha, Yetty Ramli, Jan Sudir Purba. (2022). Potential Implication of Treatments for Alzheimer’s Disease: Current and Future. Journal of Surgical Case Reports and Images 5(6); DOI: 10.31579/2690-1897/118
Copyright: © 2022, Jan Sudir Purba, This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received: 31 May 2022 | Accepted: 27 November 2022 | Published: 05 December 2022
Keywords: alzheimer’s disease; amyloid beta protein; visual disturbances; inflammatory process and herbal medicine; Stem cell therapy
Alzheimer disease (AD) is a long-term and progressive neurodegenerative disorder, characterized by both structural abnormalities and inflammation in the brain. Patients suffering from AD lose autonomy in their daily normal activities that steadily worsens memory and communicating skills, often accompanied by visual disturbances, eventually leads to a disabled person of performing simple daily tasks. Pathologic characteristics of AD are β-amyloid (Aβ) plaques, neurofibrillary tangles. Current therapies till now only target the relief of symptoms using various drugs and psychotherapy and do not cure the disease. Unfortunately, few chemical drugs designed for clinical applications have reached the expected preventive or therapeutic effect so far, and combined with their significant side-effects. Traditional Herbal Medicine has accumulated many experiences in the treatment of dementia during thousands of years and modern pharmacological studies have confirmed the therapeutic effects of many active components derived from herbal medicines. Recently, stem cell therapy holds a great promise and provides a great research opportunity and has been shown to be a potential approach to various diseases, including neurodegenerative disorders. Here we review several stem cell transplantation studies with reference to both preclinical and clinical approaches. In this review, we focus on the need for developing herbal medicines and stem cell therapies for AD.
Alzheimer's disease (AD) is a progressive neurodegenerative disease associated with various disruptions such as language, executive, attention, and visuospatial function with progressive decline in cognitive function [1] . This disease was first discovered in 1901 by Alois Alzheimer, a German psychiatrist, in a woman 51 years old. This patient's condition is referred by Alzheimer's as "amnestic writing disorder" with the patient's psychosocial abnormalities including aphasia and memory disorders [2] . Impaired cognitive function is actually part of the aging process. To distinguish it from AD must go through a series of anamnese against the patient along with information from family members. In this patient a physical examination, cognitive examination using Mini-Mental State Examination (MMSE) and other supporting examinations. Petersen et al. (1999) 3 found in his study a transition stage between dementia in the elderly and dementia with AD. This transitional stage is called mild cognitive impairment (MCI). Patients with MCI found a decline in cognitive function that is not found in other people of the same age. Daily activities at MCI are still normal even though memory complaints have started to appear. In the normal aging process complaints of dementia can get worse at around 1-2% within 1 year [3,4] while about 10-15% in patients with amnestic type MCI can progress to the next stage namely AD prodromal stage. The prodromal stage is the very early form of AD when memory is deteriorating but a person remains functionally independent, a person must have an MCI also have a positive biomarker test. The biomarker tests can be a protein that is measured in cerebro spinal fluid (CSF) or a new type of scan with positron emission tomography (PET scan) that can detect the amyloid protein (Aβ) that accumulates in the brain in people with AD. In patients with AD with prodromal stage within a period of 3 years can increase to 20% [5] and can continue to reach about 50% in the next 5 years [3] . Neuropsychiatric disorders that appear on the MCI range from 43-59% [6] , where the same symptoms can also appear in sufferers of early stages of AD . Another prominent symptom that is often found is visual disturbance. This disorder arises due to lo [4,7,8]. cal pathology in the parieto-occipital region so that it is often referred to as a visual variant of Alzheimer's disease (VVAD) [9] . Deficits in visual function greatly affect daily functioning and quality of life and can explain the increased risk of falls and fractures. AD can affect visual pathways and visual cortex and result in various visual changes and problems. However, how early the visual dysfunctions occur in AD is still a matter of discussion.
Epidemiology
Epidemiological studies in a number of countries in Asia in 1998 found that around 24.3 million people were suffering from dementia where women had a higher risk of AD than men [10]. This number of sufferers continues to increase so that in 2015 "Alzheimer's Disease International" estimates the number of AD sufferers worldwide to reach 46.8 million, with a global cost of around US $ 818 billion [11]. In line with the increasing in life expectancy in various countries in the world this number is expected to increase fourfold in 2050 reaching up to 115 million AD patients [12,13,14].
Etiology
The etiology of Alzheimer's disease has not been known with certainty. However, through a number of studies both epidemiologically and biologically suspected to be caused by various causes including the aging process, the influence of toxic substances such as aluminum, heavy metals, hyper - and / or hypo thyroid, diabetes, auto immune and inflammatory processes in the form of Aβ protein accumulation [15,16] . In addition free radicals, capitis trauma and prolonged stress and severe depression are also thought to be stimuli for the occurrence of this disease [17]. Genetic disorders related to abnormalities on chromosomes [14,19,21]. are often associated as causes of AD [18,19] . The E4 variant of the apolipoprotein (ApoE) gene on chromosome 19 was identified as a susceptibility gene to late-onset Alzheimer's disease, which tends to decrease age at the onset of disease [20]. However, in general direct pathogenesis of AD has not yet been discovered by researchers. Concerning the onset at a certain age, it was found that the onset patients with older age had a better prognosis compared to their onset at a young age [21].
Neuropathology
Cognitive decline in AD results from loss of neurons and neuronal processes, which results from various factors. The pathway for the synthesis and degradation of toxic proteins in AD has been carefully studied to determine the most effective disease management [22].
Imaging
Magnetic resonance imaging (MRI) examination of the brain of Alzheimer's patients shows atrophy in the form of widening of the sulcus and the ventricles and thinning of the gyrus resulting in a decrease in brain weight. The size of brain atrophy correlates with neuropathological development [23,24] and the level of cognitive impairment [24,25]. This reduction in brain weight can reach more than 35%.
Histopathology Biomarker and Neuroinflammation
Histopathological examination found extracellular accumulation of Aβ protein, neurofibrillary tangles (NTF) in the hippocampus [26,27,28] which could damage neurons such as cholinergic neurons in the Nucleus Basalis of Meynert (NBM) as a producer of acetylchholin neurtransmitters resulting in memory disorders [29]. The human brain exists and functions with a degree of immunologic isolation.The blood brain barrier (BBB) chiefly serves this purpose by limiting access of blood-derived products to the CNS. In healthy individuals, the BBB limits the entry into the CNS of A
It is already known that the aggregation of Aβ into fibrillary amyloid plaques is a key pathological event in the development of the AD. Amyloid-beta plays an important role by inducing microglia activation. Once activated, microglial cells promote the release of reactive species and cytokines that are known to enhance immune responses in AD brain [56]. It is known that the entry and exit of substances from peripheral circulation to the brain tissue depends on the BBB. One problem for AD-targeted drugs is whether they can cross the BBB [30,57].
As is known that herbal medicine is the oldest and still the most widely used system of medicine in the world today and phytochemicals are the chemical molecules contained in plants not usually processed for pharmacological purposes. Phytochemicals and other herbal medicines are found to be useful in preventing or treating many neurodegenerative conditions, especially Alzheimer’s disease [58]. Phytochemicals influence the function of various receptors for both excitatory and inhibitory neurotransmitters in the brain and thus can maintain or alter the chemical balance of the brain [59]. Several studies have shown that the herbal medicine contain many potential alkaloids, and they can counteract oxidative stress on the nervous system and act as anti-inflammatory drugs on aging brain [60]. It is also mentioned that some of the monomers extracted from Chinese herbal medicines can cross the BBB and exert therapeutic effects directly in the brain. Others cannot, and may act as prodrugs that can be cut into smaller molecules by enzymes, and can subsequently cross the BBB [61]. Other studies have also found that some monomers extracted from Radix Salviae miltiorrhize (Danshen) can cross the BBB. Tanshinone IIA can be detected in blood in the brain within 5 minutes after intraperitoneal injection in rats, which indicates that it can cross the BBB directly in rats [62]. Danshensu, another monomer extracted from Danshen, can also cross the BBB of the Sprague Dawley Rats and reach a relatively high level in 15 min in the brain intravenously [63]. Ginsenoside Rg1, one compound of Radix Ginseng, can barely transport through the BBB [64], and compound K and 20 (S)-protopanaxatriol (PPT) metabolites of ginsenosides, exert biological activities in brain [65].
As is known that Aβ deposits are a pathological feature of AD, and therefore Aβ depletion can be a useful therapy to develop. One type of cysteine protease from the papain superfamily, which is able to degrade peptides and proteins, is cathepsin B. Cathepsin B can enter the endolysosomal system through endocytosis or phagocytosis. Hook et al. [66] and Mueller-Stein et al [67]. reported that extracellular cathepsin B is associated with amyloid plaque, collocating with Aβ in the brain chromaffin cell secretory vesicles and can reduce Aβ production by limiting proteolysis activity, so that it can be classified as a therapeutic candidate for AD [67]. Another type of herbal drugs is Glutathione which acts as an antioxidant against neurons that react with reactive oxygen species (ROS) and forms glutathione disulphide [68]. Vitamin E as another endogenous antioxidant with high levels can protect the lipid peroxidation process, has been shown to reduce the risk of AD [69]. Vitamin C is a water-soluble antioxidant that is needed to reactivate vitamin E. Although vitamins C and E have been used in clinical applications to prevent AD but do not show a clear therapeutic effect [68]. Amyloid β plays an important role in AD by inducing microglia to enhance immune responses in AD brain. Therefore, drugs that can function as negative regulators of microglia activation are considered as potential therapeutic candidates for AD. Curcumin, the major yellow pigment in turmeric (Curcuma longa), is proposed for its anti-inflammatory properties [71]. Several studies have indicated the suppressive effects of curcumin on lipopolysaccharide (LPS)-induced microglia activation and Mitogen Activated Protein Kinase (MAPK) activities. Curcumin has demonstrated beneficial effects on brain health through several mechanisms such as antioxidant, amyloid β-binding, anti-inflammatory, tau inhibition, metal chelation, neurogenesis activity, and synaptogenesis promotion [70,71].
As mentioned above, phytochemicals from herbal medicines have become a major source and main stream for future drug development and for human health care. These herbal medicines are able to target other salient systems such as cerebral blood flow, free radical scavenging, anti-inflammation, inhibition of amyloid-β neurotoxicity, glucoregulation and interaction with other neurotransmitters (such as γ-aminobutyric acid) and signaling pathways e.g. via kinase enzymes[72].
In this review, the authors cannot mention various types of herbs that have the potential for AD therapy. The author wants and pleads for herbal researchers in the future to increase their activities in developing research that is more specific to therapeutic goals in this case for Alzheimer Disease.
Stem cell therapy
Stem cells are undifferentiated cells that are capable of self-renewal and differentiation. Most human tissues are composed of a majority of differentiated cells with a limited life span. These cells die and the tissue shrinks, unless replenished by new cells. A crucial source of these new cells is tissue stem cells, which compose only a small minority of a tissue’s cells. These cells are termed adult stem cells and are multipotent (capable of differentiation into several cell types, but not all three germ layers). Nevertheless, they are required for the maintenance of adult tissues. Alzheimer's disease is a disease that involves damage to neurons in several locations in the brain. The location of neuronal damage in these different areas makes each case unique and very difficult to treat. Stem cells have a therapeutic effect through the process of regeneration and cell substitution from the tissue itself. Stem cell therapy strategies have two mechanisms. One of them is to induce endogenous stem cell activation and the other is to support the regeneration of injured cells or tissues through stem cell transplantation [73].
An important step in developing any stem cell therapy is to choose the appropriate cell source. The most commonly utilized cells in recent AD studies are embryonic stem cells (ESCs), mesenchymal stem cells (MSCs), brain-derived neural stem cells (NSCs), and induced pluripotent stem cells (iPSCs), each has unique properties that could be used in stem cell therapy strategies in various ways [74].
ESCs are derived from the inner cell mass of the developing blastocyst and are classified as pluripotent because they possess the ability to generate cell types from the ectodermal, mesodermal, and endodermal germ layers. MSCs are involved in the development of mesenchymal tissue types and can be harvested from umbilical cord blood (UCB-MSCs) or Wharton’s jelly, and also remain present in several adult stem cell niches including bone marrow and adipose tissue. A subspecies of stem cells are embryonic stem (ES) cells, which can be obtained from early stage embryos (blastocyst). ES cells are pluripotent, which means they can differentiate into all three primary germ layers [75,76]. ES cells are critical to organism development. A defect in ES cell differentiation may have a pleiotropic effect on the organism. ES cells recently gained tremendous attention due to the reprogramming of adult somatic cells into induced pluripotent (iPS) cells [75]. iPS cells posses ES cell properties and were developed with the long-term objective to gain a new therapeutic tool.
Treatment of AD with stem cell technology depends on the neurogenesis capacities of stem cells. The strategy is to utilize stem cells to physically replace the neurons that are lost of cell in the degenerative stages of AD. In recent findings, the importance of glial cells and intercellular binding proteins in shaping the external environments of neurons have been suggested. The decline of microglia, astrocytes and oligodendrocytes that support the neuronal networks in the CNS through immune, nutritional and homeostatic mechanisms are correlated with the neuro inflammatory biochemistry of AD [77,78]. Through transplantation or in situ regeneration of lost neurons and key proteins that support them, there is hope to rebuild the integrity of the CNS and to alleviate the decline in cognitive functions in AD patients. ESC obtained from cell mass in a blastocyst, is pluripotent capable of developing three embryonic layers into ectoderm, mesoderm, and endoderm [79]. ESC is an excellent candidate for cell replacement therapy approach, where pluripotency is directed to develop properly into the growth of nerve tissue [80,81]. From the results of this recent research found the importance of glial cell bonding with protein as a binding between cells in forming the external environment of neurons [82]. Stem cell therapy through regeneration of in situ from damaged neurons is the formation of major proteins, raising hopes for rebuilding the integrity of the central nervous system in AD sufferers.
Alzheimer’s disease (AD) is one of the most serious health issues for the elderly leading to neuronal dysfunctions with cognitive impairment. Pathologically, AD is characterized by two hallmark protein aggregates, amyloid-β (Aβ) plaques and neurofibrillary tangles, that are accompanied by neuroinflammation, including microgliosis, elevated cytokine production, and activation of complement pathways. It is clear that cerebral or peripheral inflammation can be an early AD and can affect visual pathways, visual cortex, result in various visual changes and problems. However, literature on the presence of Aβ and phosphorylated tau (pTau) in AD retinas is inconclusive visual dysfunction has long been recognized as a manifestation of Alzheimer's disease (AD), particularly in the form of visuospatial impairment during all stages of disease. However, investigations have revealed findings within the anterior (i.e., pregeniculate) afferent visual pathways that rely on retinal imaging and electrophysiologic methodologies for detection. It is still not possible to conclude if anti-inflammatory treatment alone is no longer treating AD. Phytochemicals from medicinal plants have been used in different systems of medicine. Most of herbals medicine have been chemically evaluated and their efficacy has also been proven in clinical trials. However, the underlying mechanisms of actions are still on the way.
Stem cell-based therapies may become an effective therapeutic alternative (to conventional therapies) due to their regenerative potential. Although the mechanism of action of stem cell therapies remains incompletely elucidated, a number of preclinical studies have provided promising results. However, human clinical trials are still in their infancy. For the successful clinical translation of this technology, further relevant animal studies and clinical trials (with standardized protocols) are needed. However, there are many questions left unanswered regarding the safety, efficacy, ethical issues, and regulatory framework of stem cell-based therapies but there is a growing hope for patient-specific individualized stem cell based therapy.
The authors declare that there is no conflict of interests regarding the publication of this paper.
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