MicroRNA-502-3p and Human Diseases: Focus on Alzheimer's: Comparison
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The microRNA-500’s family has five different genotypes: microRNA-362, microRNA-500a, microRNA-500b, microRNA-501, and microRNA-502 (Genesnames.org). All the forms of miR-500 family members are expressed in humans and different animal species. The miR-502-3p sequence is 22 nucleotides long and is found in Homo sapiens (Has-miR-502-3p) as annotated by 7 gene databases such as MalaCards, miRBase, GeneCards, TarBase, ENA, RefSeq, and LncBase. The miR-502 were also found to be conserved in seven different animal species such as Cow (Bos taurus) Bta-miR-502a; Dog (Canis lupus familiaris) Cfa-miR-502; Horse (Equus caballus) Eca-miR-502-3p; Gorilla (Gorilla gorilla) Ggo-miR-502a; Rhesus monkey (Macaca mulatta) Mml-miR-502-3p); Rabbit (Oryctolagus cuniculus) Ocu-miR-502-3p; and Bornean orangutan (Pongo pygmaeus) Ppy-miR-502-3p (https://rnacentral.org/rna) (accessed on 26 February 2023). The miR-502-3p is encoded by the MIR502 gene (ENSG00000272080) which is composed of an 86 base-pairs genomic sequence, a plus stranded RNA orientation starting from 50,014,598, and ending at 50,014,683. The MiR502 gene is located at the Chromosome X genomic location: 50,014,598-50,014,683 forward strands.

  • Alzheimer’s disease
  • microRNAs
  • MiR-502-3p

1. MiR-500 Family

The microRNA-500’s family has five different genotypes: microRNA-362, microRNA-500a, microRNA-500b, microRNA-501, and microRNA-502 (Genesnames.org). All the forms of miR-500 family members are expressed in humans and different animal species. The miR-502-3p sequence is 22 nucleotides long and is found in Homo sapiens (Has-miR-502-3p) as annotated by 7 gene databases such as MalaCards, miRBase, GeneCards, TarBase, ENA, RefSeq, and LncBase. The miR-502 were also found to be conserved in seven different animal species such as Cow (Bos taurus) Bta-miR-502a; Dog (Canis lupus familiaris) Cfa-miR-502; Horse (Equus caballus) Eca-miR-502-3p; Gorilla (Gorilla gorilla) Ggo-miR-502a; Rhesus monkey (Macaca mulatta) Mml-miR-502-3p); Rabbit (Oryctolagus cuniculus) Ocu-miR-502-3p; and Bornean orangutan (Pongo pygmaeus) Ppy-miR-502-3p (https://rnacentral.org/rna) (accessed on 26 February 2023). The miR-502-3p is encoded by the MIR502 gene (ENSG00000272080) which is composed of an 86 base-pairs genomic sequence, a plus stranded RNA orientation starting from 50,014,598, and ending at 50,014,683. The MiR502 gene is located at the Chromosome X genomic location: 50,014,598-50,014,683 forward strands. The MIR502 gene has one transcript (splice variant), fifty-eight orthologues, and three paralogue components (www.useast.ensembl.org) (accessed on 26 February 2023). This MIR-502-3p transcript also has one exon which is associated with thirty-nine variant alleles, and maps to fifty-seven oligo probes. The hsa-miR-502-3p sequence is a product of hsa-miR-502, miR-502-3p, MIR502, miR-502, and hsa-miR-502-3p genes. Figure 1 shows the secondary structure of MIR-500 with percentage (%) of G-C contents. The hsa-miR-502-3p was reported to interact with several protein-coding genes, including 156DAG, 182-FIP, 2700066J21Rik, 2H9, 80K-L, 82-FIP, A2MR, A3a, AAMP, and ABCA12 (https://rnacentral.org/rna/URS0000601CC4/9606/) (accessed on 26 February 2023). In humans, miR-502 is more heavily expressed in the following tissues: subcutaneous adipose, aorta, the cerebellar hemisphere of the brain, spinal cord, cultured fibroblast cells, muscularis esophagus, left ventricle of the heart, liver, and lung (https://www.gtexportal.org/home/gene/MIR502/) (accessed on 6 February 2023). MiR-501-3p and miR-502-3p are very close members with a single base sequence difference, however their seed sequence is similar. 
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Figure 1. Secondary structure of miR-500 family showing presence of G-C Nucleotide. The 97 percent (%) of G-C nucleotide observed no mutations (Red). The 90 percent (%) of G-C nucleotide conveying mutations (Green) and the 75 percent (%) G-C nucleotide with compatible mutations (Source: useast.ensembl.org) (accessed on 25 February 2023).

2. MiR-502-3p and Human Diseases

The first instance of miR-502-3p associated with disease came in 2014 when it was found to be upregulated in Merkel Cell Carcinoma [1]. Since then, further research has found miR-502-3p to be implicated in other human diseases such as osteoporosis, diabetes, muscular dystrophy, tuberculosis, multiple cancers, and neurodegenerative disorders (Table 1). Figure 2 depicts the role of miR-502-3p in most common human diseases.
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Figure 2. Involvement of miR-502-3p in most common human diseases. MiR-502-3p is involved in cancers, type 2 diabetes, tuberculosis, osteoporosis, muscular dystrophy, dementia, and Alzheimer’s disease.
Table 1. Details of miRNA-502-3p in various human diseases, their status, target genes, signaling pathways, and study purpose.
MiRNA-502-3p and Human Diseases
Disease miR-502-3p Target Gene Signaling Pathway Purpose Reference
Osteoporosis Downregulated     Biomarker Zhang et al., 2021
Diabetes Type 2 Upregulated     Therapeutic Montastier et al., 2019
Tuberculosis Upregulated ROCK1 TLR4/NF-κB Detrimental Liu et al., 2021
Lamin A/C-associated Muscular Dystrophy Upregulated       Sylvius et al., 2011
MiRNA-502-3p and Human Cancers
Disease miR-502-3p Target Gene Signaling Pathway Purpose Reference
Chronic Lymphocytic Leukemia Upregulated   IL-4 pathway Therapeutic Ruiz-Lafuente et al., 2015
Invasive Pituitary Adenoma Downregulated KMT5A LINC00473/miR-502-3p/KMT5A Axis   Li et al., 2021
Colorectal Cancer Upregulated OLFM4   Detrimental Sugai et al., 2022
Gallbladder Cancer Downregulated SET LncRNA-HGBC/miR-502-3p/SET/AKT Axis   Hu et al., 2019
Interstitial Lung Abnormality Upregulated   p53 Signaling Pathway Biomarker Ortiz-Quintero et al., 2020
Lung Adenocarcinoma Upregulated MUC4   Detrimental Subat et al., 2018
Pulmonary Ground-Glass Nodules Upregulated     Prognostic Zhang et al., 2019
Pancreatic Cancer Downregulated Various     Tan et al., 2018
Stomach Cancer Downregulated OLFM4 circ-RPL15/miR-502-3p/OLFM4/STAT3   Kim et al., 2021
Merkel Cell Carcinoma Upregulated       Ning et al., 2014
Conjunctival Malignant Melanoma Upregulated       Larsen et al., 2016
Triple Negative Breast Cancer Upregulated       Zhang et al., 2019
Follicular Lymphoma Upregulated       Wang et al., 2012
Hepatocellular Carcinoma       Detrimental Liu et al., 2022
Renal Cell Carcinoma Downregulated     Diagnostic Wach et al., 2013
Esophageal Adenocarcinoma Downregulated       Fassan et al., 2020
MiRNA-502-3p and Neurodegenerative Disorders
Disease miR-502-3p Target Gene Signaling Pathway Proposed Benefit Reference
Frontotemporal Dementia Downregulated     Biomarker Grasso et al., 2019
Vascular Dementia Upregulated     Biomarker Prabhakar et al., 2017
Alzheimer’s Disease Downregulated     Biomarker Satoh et al., 2015
Alzheimer’s Disease Upregulated (Synapse) GABRA1 GABAergic synapse Therapeutic Kumar et al., 2022
MiRNA-501-3p and Neurodegenerative Disorders
Disease miR-501-3p Target Gene Signaling Pathway Proposed Benefit Reference
Schizophrenia Downregulated Grm5   Therapeutic Liang et al., 2022
Cognition Negatively Correlated     Predictive Gullett et al., 2020
Memory Upregulated     Therapeutic Goldberg et al., 2021
Vascular Dementia Upregulated ZO-1 TNFα/miR-501-3p/ZO-1 axis Therapeutic Toyama et al., 2018
Alzheimer’s Disease Downregulated (serum), Upregulated (brain)       Hara et al., 2017
AMPAR Degradation Upregulated Gria1     Hu et al., 2015
Alzheimer’s Disease Upregulated (Synapse) GABRA1   Therapeutic Kumar et al., 2022

2.1. Osteoporotic Fractures

Osteoporosis is a condition of decreased bone mass, which leads to diminished bone strength and predisposes patients to osteoporotic fractures [2]. In osteoporotic fractures, increased proinflammatory cytokines, such as TNF-α, play a role in bone loss [3]. Zhang et al. (2021) studied the correlation between TNF-α, omentin-1, and miR-502-3p in patients with osteoporosis [4]. Omentin-1 is a recently discovered adipocytokine that displays anti-inflammatory effects [4]. In their study, they found that omentin-1 and miR-502-3p were both underexpressed in osteoporosis patients with osteoporotic fractures compared to osteoporosis patients without osteoporotic fractures. Furthermore, TNF-α was independently, negatively correlated with both omentin-1 and miR-502-3p. Omentin-1 and miR-502-3p were also found to be positively correlated with each other. Overall, the study confirmed the predictive value of omentin-1 and miR-502-3p in the diagnosis and prognosis of osteoporotic fractures [4]. The correlation between miR-502-3p, omentin-1, and other osteoporotic fractures must still be analyzed in future studies.

2.2. Diabetes

Diabetes mellitus (DM) is a disease that affects 37.3 million people in the US, which is 11.3% of the US population [5]. DM is an issue related to insulin, which ultimately interferes with the body’s ability to uptake glucose and leads to hyperglycemia [6]. It is commonly categorized into two types: Type 1 DM (T1DM) and Type 2 DM (T2DM) [7]. T2DM is primarily caused by defective insulin secretion by pancreatic β-cells and the inability of insulin-sensitive tissues to respond to insulin [8].
Montastier et al. (2019) explored the role of miR-502-3p in insulin resistance, which is one of the primary causes of T2DM [9]. Niacin is an anti-dyslipidemic drug that is known to cause insulin resistance. In the study, obese men were treated with either niacin, acipimox (a niacin-like drug that does not induce insulin resistance), or transfected with miR-502-3p. The biopsy of subjects’ adipose tissues showed that miR-502-3p was upregulated in the subjects who received Niacin treatment. There was no significant change in the expression of miR-502-3p in the acipimox treatment group. The study found that the overexpression of miR-502-3p caused impaired insulin-stimulated glucose uptake. This suggests that niacin-induced insulin resistance is mediated by miR-502-3p, leading one to believe that anti-miR-502-3p could be helpful in treating obesity-related insulin resistance [9].

2.3. Tuberculosis

Tuberculosis (TB) is an infectious disease caused by the bacteria Mycobacterium tuberculosis (M. tuberculosis) that most often affects the lungs. It is highly prevalent in the socioeconomically poor populations of the world [10]. Liu et al. (2020) found that miR-502-3p plays a role in TB by facilitating the survival of M. tuberculosis in macrophages. Infections are combated with the help of proinflammatory cytokines such as IL-6, TNF-α, and IL-1β. These cytokines were significantly reduced in M. tuberculosis-infected macrophages when transfected with a miR-502-3p mimic. Rho-associated coiled-coil-forming protein kinase 1 (ROCK1) acts to activate monocyte proinflammatory response via the TLR4/NF-κB pathway and is a direct target of miR-502-3p via a receptor in the 3′-UTR of ROCK1. MiR-502-3p decreases the protein expression of ROCK1, which downregulates the TLR4/NFκB pathway and leads to decreased proinflammatory cytokine response and promotes M. tuberculosis survival [11].

2.4. Other Human Diseases

MiR-502-3p has also been found to be associated with several other diseases; however, these studies did not focus on miR-502-3p. One example is that miR-502-3p was found to be upregulated in lamin A/C-associated muscular dystrophy, but further studies must be completed to determine the specific role it plays in disease pathology [12]. A study was also conducted to analyze the expression of miR-502-3p in polycystic ovarian syndrome (PCOS). They reported that there was no significant upregulation of miR-502-3p in PCOS patients, but the authors acknowledged that this could be because all subjects were still in the early stage of PCOS and that miR-502-3p may play a role in the progression of the disease [13]. Future studies must be completed involving patients in different stages of PCOS progression.

3. MiR-502-3p and Human Cancers

MiR-502-3p has been found to be associated with many human cancers. These include triple negative breast cancer, follicular lymphoma, chronic lymphocytic leukemia, invasive pituitary adenoma, colorectal cancer, esophageal cancer, gallbladder cancer, hepatic cancer, lung cancer, pancreatic cancer, renal cancer, skin cancer, and stomach cancer. Here, findings of the molecular mechanisms of miR-502-3p will be discussed as it relates to the listed cancers (Table 1). Figure 3 shows the role of miR-502-3p in most common human cancers.
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Figure 3. Roles of miR-502-3p in various human cancers.

3.1. Chronic Lymphocytic Leukemia

Chronic lymphocytic leukemia (CLL) is the most common leukemia in developed countries and mostly presents in the elderly, with the median age of diagnosis being 72 years old [14]. Ruiz-Lafuente et al. (2015) studied miRNAs associated as part of the interleukin-4 (IL-4) pathway in CLL. IL-4 promotes B cell differentiation and protects CLL B cells from apoptosis [15]. This study observed the upregulation of miR-21 and the miRNAs hosted within the CLCN5 gene, including miR-502-3p, when IL-4 was stimulated. It is possible that the miRNAs upregulated by IL-4 stimulation play a role in the anti-apoptotic effects of the IL-4 pathway in CLL, but further studies are required. If proven, miR-502-3p, along with the other miRNAs upregulated by IL-4, could be a promising target for CLL therapy [16].

3.2. Invasive Pituitary Adenoma

Pituitary adenomas are benign neoplasms that make up 10–15% of all intracranial masses [17]. About 30% of pituitary adenomas exhibit invasive behaviors and are classified as invasive pituitary adenomas (IPA) [18]. The role of miR-502-3p in IPAs was explored by Li et al. (2021). Long noncoding RNAs (lncRNAs) are transcripts with over 200 nucleotides but lack open reading frames [19]. Li et al. (2021) found that LINC00473 was the most upregulated lncRNA in IPA and that it downregulates miR-502-3p. Overexpression of LINC00473 promotes cell proliferation while overexpression of miR-502-3p inhibits cell proliferation in pituitary adenomas. Furthermore, the study determined that KMT5A is the target gene of miR-502-3p. KMT5A is a methyltransferase that increases the expression of cyclin D1 and CDK, promoting cell proliferation in IPA [18]. Upregulation of miR-502-3p was shown to inhibit the expression of KMT5A, which suggests that miR-502-3p is protective in IPA.

3.3. Colorectal Cancer

Colorectal cancer accounts for the second most cancer deaths in the United States when considering both men and women [20]. Colorectal intramucosal cancer (IMC) is defined as carcinoma confined to the mucosal layer of the colon [21]. A genome-wide analysis of microRNA and mRNA expression in colorectal cancer uncovered an association between IMC and miR-502-3p [22]. The study found that miR-502-3p was inversely correlated with olfactomedin4 (OLFM4). OLFM4 is a glycoprotein expressed in intestinal crypts that functions to preserve intestinal Lrg5-positive stem cells. miR-502-3p was found to regulate OLFM4. Overexpression of miR-502-3p causes a reduced expression of OLFM4, which could be associated with IMC pathology.

3.4. Gallbladder Cancer

Gallbladder cancer (GBC) is an extremely aggressive malignancy with a 5-year survival rate of less than 20% [23]. Hu et al. (2019) found a lncRNA highly expressed in GBC (lncRNA-HGBC) that is upregulated in GBC and asserts its effects through an axis involving miR-502-3p. LncRNA-HGBC binds to HuR, which stabilizes the lncRNA. Then, LncRNA-HGBC directly binds to and inhibits miR-502-3p. This sequestration of miR-502-3p causes an upregulation of SET, a proto-oncogene. SET causes the downstream activation of AKT, which contributes to the proliferation of GBC cells. This study revealed that the lncRNA-HGBC/miR-502-3p/SET/AKT axis is important in GBC progression and proposes that lncRNA-HGBC could be a potential therapeutic target in the future [24].

3.5. Lung Cancer

Interstitial lung abnormalities (ILA) are interstitial patterns incidentally detected on CT scans in patients without previously known lung diseases [25]. ILA can progress to multiple lung diseases, including interstitial pulmonary fibrosis and lung cancer [26]. Patients with ILA were found to have an increased risk for lung cancer and lung cancer mortality [27]. Ortiz-Quintero et al. (2020) found that miR-502-3p is upregulated in ILA and can be used as a biomarker to predict the presence of ILA in asymptomatic patients with a sensitivity of 51% and a specificity of 81%. KEGG pathway analysis found that the p53 signaling pathway is affected by miR-502-3p [26].
Lung cancer is the most commonly diagnosed cancer and accounts for the most cancer-related deaths, globally [28]. Lung cancer is classified as either small-cell lung cancer or non-small cell lung cancer (NSCLC). Lung adenocarcinoma is the most prevalent type of NSCLC [29]. In EGFR-mutated lung adenocarcinoma, miR-502-3p was found to be upregulated. Pathway analysis showed that miR-502-3p, miR-500a-3p, and miR-652-3p (two other upregulated miRNAs in EGFR-mutated lung adenocarcinoma), interact with and downregulate MUC4. Downregulated MUC4 has previously been shown to promote tumor progression in EGFR-mutated lung adenocarcinoma [30]. Additionally, miR-502-3p was found to be overexpressed in lung adenocarcinoma when compared to lung squamous cell carcinoma, another type of non-small cell lung cancer [31]. However, the differences in miRNA-502-3p expression between the two types of cancers and how it affects their respective pathophysiologies have yet to be explored.
The prognosis of lung cancer has also been related to miRNA expression. Zhang et al. (2019) explored the diagnostic value of extracellular vesicles (EVs)-derived miRNAs for patients with pulmonary ground-glass nodules (GGNs). These nodules can be benign or malignant, but they are difficult to differentiate through biopsy. This study introduced a new method to potentially diagnose malignancies using plasma miRNAs derived from EVs. While designing the diagnostic support vector-machine model, they also found that miR-502-3p, along with miR-500a-3p and miR-501-3p, were associated with the progression of tumor cells. Patients with upregulated expression of these three miRNAs showed enhanced overall survival. Furthermore, when comparing miRNA expression before and after surgery, they found that miR-502-3p, miR-500a-3p, and miR-501-3p were all upregulated post-surgery. While the molecular connection between tumor progression and these three miRNAs must be further explored, it is clear that these miRNAs could possibly aid physicians in creating individualized treatment plans concerning lung cancer [32].

3.6. Pancreatic Cancer

Pancreatic cancer has one of the lowest five-year survival rates (11%) because it is often diagnosed at an advanced stage [33][34]. Tan et al. (2018) found that miR-502-3p was downregulated in pancreatic cancer. They predicted that miR-502-3p targeted the following mRNAs: KCTD9, RNF144A, DOK6, PTPRF, PDE3B, RORA, MYCN, DAPK1, ADAMTS3, CBLL1, and RBMS1. Further KEGG analysis shows that miR-502-3p and the other downregulated miRNAs in pancreatic cancer may be associated with tight junctions and apoptosis, possibly preventing tumor invasion and metastasis. While more studies must still be completed, these findings suggest that miR-502-3p plays some role in pancreatic cancer [35].

3.7. Stomach Cancer

In the US, it was estimated that there would be over 26,000 new cases of gastric cancer (GC) and over 11,000 deaths due to GC [36]. Recent works have uncovered the role of microRNA in GC. Li et al. (2020) found that miR-502-3p was part of a regulatory axis that is associated with gastric cancer: circ-RPL15/miR-502-3p/OLFM4/STAT3. Circular RNAs (circRNAs) are noncoding RNAs that are involved in the pathogenesis of many cancers. Circ-RPL15, a circRNA, promotes GC progression by functioning as a competitive endogenous RNA and sponging miR-502-3p. MiR-502-3p normally downregulates OLFM4 and p-STAT3 (phosphorylated-STAT3). OLFM4 is a protein with anti-apoptotic effects that also promotes tumor progression by enhancing STAT3 activation. These findings suggest that miR-502-3p has anti-tumor effects in GC [37]. This is further supported when Kim et al. (2021) found that downregulated miR-502-3p was associated with lymph node metastasis in intramucosal gastric cancer [38].

3.8. Other Cancers

Across the literature relating to miR-502-3p, abnormalities in its expression were also found to be associated with various cancers; however, these studies did not focus on miR-502-3p, so they were not discussed in this entry. MiR-502-3p was found to be upregulated in Merkel cell carcinoma [1], conjunctival malignant melanoma [39], triple negative breast cancer [40], and follicular lymphoma [41]. The mechanisms by which miR-502-3p upregulation impacts these malignancies must be further explored. Liu et al. (2022) also found that miR-502-3p, along with six other miRNAs, may be critical in the live tumor progression of hepatocellular carcinoma [42]. Additionally, differences in miR-502-3p expression were found to be essential in distinguishing between normal tissue and renal cell carcinoma tissues [43]. Finally, miR-502-3p was found to be downregulated in Barrett’s carcinogenesis, an esophageal adenocarcinoma [44].

4. MiR-502-3p and Neurodegenerative Disease

There is a very limited amount of research that exists concerning miR-502-3p and neurodegenerative disorders. Current literature links miR-502-3p to different types of dementia, including AD, frontotemporal dementia (FTD), and vascular dementia (VD). Until researchers' laboratory began to explore the role of miR-502-3p in AD, it was known to be a potential biomarker across different forms of dementia. When combined with analyzing the expression of miR-633a and miR-206, miR-502-3p can be used as a biomarker to diagnose FTD with a 100% sensitivity and 87.5% specificity. Global miRNA profiling showed downregulation of all three of these miRNAs in FTD [45]. MiR-502-3p can also be used as a potential biomarker in VD caused by cerebral small vessel disease with a 75% sensitivity and 89% specificity. It was found to be upregulated by 4.68-fold in small vessel VD [46]. Finally, Satoh et al. (2015) identified miR-502-3p as a potential biomarker in AD after finding that it is downregulated in the plasma of AD patients. The study further discussed how all 14 potentially downregulated miRNAs, including miR-502-3p, in AD are related to neuronal synaptic functions [47]. The specific role of miR-502-3p in the pathology of the previously mentioned dementias must be further explored.

5. MiR-501-3p and Neurodegenerative Disease

While the literature on miR-502-3p and neurodegenerative disorders remains limited, miR-501-3p, another miRNA that was recently characterized in AD, seems to have a more explored role in neurological functions. The study found the significant upregulation of both miR-502-3p and miR-501-3p in the AD synapse [48]. Since miR-501-3p and miR-502-3p belong to the same family and the seed sequence of both miRNAs is similar in humans, it is important to explore the role of miR-501-3p in neurological disorders including AD.

5.1. Schizophrenia

Schizophrenia is a complex psychiatric disorder that presents with positive (hallucinations, delusions) symptoms, negative symptoms (lack of interest, lack of concentration), and cognitive dysfunction and affects 32% of people worldwide [49][50]. Liang et al. (2022) investigated the role of miR-501-3p in schizophrenia. They found that miR-501-3p was downregulated in schizophrenia. Using miR-501-3p knockout male mice, the study showed that the loss of miR-501-3p resulted in the loss of total dendritic spine density, suggesting that the miRNA is necessary for regulating synaptic structure or function. Additionally, the loss of miR-501-3p also resulted in sociability, memory, and sensorimotor gating disruptions in male mice. The rescue of miR-501-3p reversed the above findings.
Further results showed that miR-501-3p directly binds to the 3′UTR of Grm5, a gene that encodes glutamate metabotropic receptor 5 (mGluR5). mGluR5 is involved in neural network activity regulation and N-methyl-d-aspartate receptors (NMDAR) function and plasticity. The study shows that miR-501-3p downregulates Grm5 expression and thus decreases mGluR5. To evaluate the effects of mGluR5 in miR-501-3p knockout mice, they inhibited mGluR5 using MTEP and found that this improved impaired social preference, social novelty recognition, and novel object recognition. Finally, they found that mGluR5 works with NMDAR to produce increases in excitatory synaptic transmission in miR-501-3p knockout mice, which shows their necessity in the observed social and memory impairments. Overall, this study’s findings suggest that miR-501-3p could play a role in the pathogenesis of schizophrenia by modulating mGluR5 [51].

5.2. Cognition and Memory

Cognitive deterioration is one of the most significant symptoms of AD. Visualizing AD as a continuum, patients will go from normal cognition to mild cognitive impairment, and eventually, their cognition will continue to decline as they progress through the later stages of AD [52]. Recent studies have linked miR-501-3p to cognition.
Gullett et al. (2020) studied miRNAs as predictive factors in the cognition of healthy older adults. MiR-501-3p was found to be one of the top-ranked predictors for fluid, crystallized, and overall cognition performance. The Montreal Cognitive Assessment (MoCA) was one of the tests used to assess cognition in the participants. The study found that miR-501-3p was negatively correlated with the MoCA score, which contrasted with an earlier study [53] that found a positive correlation between miR-501-3p and MMSE performance, which is another test that measures cognitive function. Despite the contrasting findings, these results from two different studies suggest that miR-501-3p plays a role in cognition [54].
Goldberg et al. (2021) delved deeper into the connection between miR-501-3p and cognition. Using an exercise model of memory-enhanced rats, the study showed an upregulation of miR-501-3p in rats after exercise. Since exercise has already been previously shown to improve memory function in humans, these findings suggest that miR-501-3p is upregulated in improved memory states. Furthermore, inhibition of miR-501-3p resulted in the upregulation of genes involved in neuronal cell death, autophagy, hypoxia, and ER stress and the downregulation of genes involved in structural and functional synaptic plasticity. The role of miR-501-3p was further characterized by the decreased dendritic spine density, number of mature synapses, and neuronal network activity observed after inhibition of the miRNA. Overall, these results indicate the importance of miR-501-3p in regulating synaptic integrity and synapse number. Hara et al. (2017) found downregulation of miR-501-3p in AD. Perhaps these findings hint that exercise could be used as a preventative measure or in the amelioration of AD [55].
Toyoma et al. (2018) proposed a specific mechanism for the role of miR-501-3p in cognitive impairment. VD is dementia caused by impaired cerebral perfusion. The study used a VD model in mice by performing bilateral common carotid-artery occlusion stenosis (BCAS) surgery. TNFα was elevated after BCAS surgery, which led to decreased claudin-5, ZO-1, and Occludin expression. These three proteins are key tight junction proteins that play a role in maintaining the blood–brain barrier (BBB). BBB disruption is one of the mechanisms thought to contribute to cognitive impairment in VD. Analysis of miRNA expression levels 48 h post BCAS surgery showed an upregulation of miR-501-3p in white matter endothelial cells. When mice that underwent BCAS surgery were treated with anti-miR-501-3p, the BCAS-induced decrease in ZO-1 was reversed. TNFα levels were unchanged in anti-miR-501-3p-treated BCAS mice when compared to BCAS mice that were not treated with anti-miR-501-3p, suggesting that miR-501-3p plays a role in the downregulation of ZO-1 due to TNFα. Additionally, anti-miR-501-3p treatment significantly ameliorated spatial working memory deficits and prevented white matter lesions. Overall, this study’s findings suggest that the TNFα-miR-501-3p-ZO-1 axis plays a role in hypoperfusion-induced working memory and white matter deficits due to BBB disruption and that therapy involved in targeting miR-501-3p could be beneficial in VD patients [56].

5.3. Alzheimer’s Disease

In 2017, Hara et al. introduced miR-501-3p as a novel serum biomarker for AD. The study found that miR-501-3p expression was downregulated in the serum but elevated in the brains, specifically the temporal cortex, of AD patients. Analysis at different stages of AD progression showed that miR-501-3p levels increased in the brain and decreased in the serum as the disease worsened. Overexpression of miR-501-3p was found to affect 208 significant genes, 128 of which were downregulated. Using TargetScan 7.1, they found that miR-501-3p was directly bound to 71/123 of the downregulated annotated genes (only 123 of the 128 downregulated genes were annotated in TargetScan 7.1). Genes that were downregulated were related to DNA replication and the mitotic cell cycle. The paper also concludes inappropriate re-entry into the cell cycle leads to apoptotic cell death, which precedes the development of senile plaques and NFTs [53].
Hu et al. (2015) explains one of the mechanisms of miR-501-3p in synaptic function. α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (AMPARs) are ionotropic glutamate receptors that determine the strengths of synapses. Previous studies have linked decreases in AMPARs and synaptic loss with AD [57]. Normally, NMDARs, which are metabotropic glutamate receptors, regulate AMPARs. This process is essential in determining the strength of synaptic connectivity during learning and memory. The study found that miR-501-3p is necessary for the NMDAR-mediated changes in AMPAR expression. MiR-501-3p is upregulated by NMDAR stimulation through the NMDAR subunit GluN2A. The miRNA then directly binds to the 3′UTR of Gria1, a gene that codes for the GluA1 subunit of AMPAR, and decreases GluA1 expression. The downregulation of GluA1 expression by miR-501-3p occurs locally in the dendrites and is vital for long-lasting spine remodeling [58]. As previously discussed, miR-501-3p was found to be upregulated in the brains of AD patients, and its expression increased as AD progressed. The findings from Hu et al. could provide a possible mechanism by which miR-501-3p participates in the pathogenesis of AD. Figure 4 describes the molecular mechanism of miR-501-3p in synapse dysfunction in AD.
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Figure 4. MiR-502-3p- and miR-501-3p-mediated molecular mechanisms of synaptic dysfunction in AD. (1) MiRNA-501-3p binds to the 3′UTR of Grm5 and inhibits its expression. In schizophrenia, miRNA-501-3p is downregulated, causing increased expression of Grm5 and mGluR5, the receptor for which it codes. This leads to increased excitatory synaptic transmission, which eventually results in the loss of total dendritic spine density and abnormalities in sociability and memory. (2) NDMAR-mediated changes in AMPAR expression occur via a miRNA-501-3p pathway. MiRNA-501-3p binds to the 3′UTR of Gria1 and inhibits its expression. This causes decreased production of the GluA1 subunit of AMPARs. This process is responsible for long-lasting spine remodeling. (3) Both miRNA-501-3p and miRNA-502-3p negatively modulate GABRA1 expression, leading to a decrease in GABA-A receptors. This may be a potential mechanism for the synaptic degradation of GABAergic synapses that lead to AD.

6. MiR-502-3p and Alzheimer’s Disease

Previous studies have analyzed the differential expressions of miRNAs in the serum and brain of AD patients [47][53]. Synaptosomes contain the molecular machinery necessary to undergo synaptic function, so the miRNAs present in synaptosomes could be essential for synapses to function correctly. Researchers' most recent study focused on synaptosomal miRNAs and their potential roles in the synaptic dysfunction that occurs in AD [48].
Using postmortem brains, researchers prepared synaptosomes of both AD cases and unaffected controls (UC). Analysis of miRNAs in AD synaptosomes vs. UC synaptosomes revealed several miRNAs that were significantly upregulated in AD synaptosomes compared to UC synaptosomes, including miR-502-3p. Additionally, researchers compared synaptosomal miRNA expression among AD samples in different Braak stages. It was found that miR-501-3p, miR-502-3p, miR-877-5p, and miR-103a-3p were significantly different as AD progressed, suggesting that these miRNAs may be involved in AD progression [48].
One of the findings from an in silico Ingenuity® Pathway Analysis (IPA) of the deregulated synaptosomal miRNAs in AD vs. UC samples showed that the miR-500 family, including miR-501-3p, was significantly linked to several biological processes and disorders. Further analysis showed that miR-501-3p was significantly involved in GABAergic synapse function. The GABRA1 gene is a potential common target of miR-501-3p and miR-502-3p. Gene ontology enrichment analysis of miR-502-3p showed that the miRNA is significantly involved in external stimuli and nervous system development, and its most significant cellular component was the GABAergic synapse [48].
Previous studies have reported dysfunctional GABAergic synapses in AD. The study supports this as researchers found reduced GABRA1 levels in AD synaptosomes. Both IPA and Gene Ontology Enrichment show strong links between miR-501-3p and miR-502-3p with the GABAergic synapse pathways. It is possible that these two miRNAs could regulate the GABAergic pathway by negative modulation of GABRA1 expression, leading to synaptic dysfunction seen in AD. This is further supported by the findings of increasing miR-501-3p and miR-502-3p expression with progressing Braak stages [48]. Figure 4 demonstrates the molecular mechanism of miR-502-3p in synapse dysfunction in AD.

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