Abstract

Background: Treatment of patients with Parkinson disease (PD) using autologous mesenchymal stem cells (MSCs) is a promising method to influence the pathogenesis of the disease. The aim of this study was to assess the immediate results of the introduction of MSCs on the effectiveness of motor and nonmotor symptoms in patients with PD.

Methods: MSCs were transplanted to 12 patients with PD through intravenous and tandem (intranasal + intravenous) injections. Effectiveness of the therapy was evaluated 1 and 3 months posttransplantation. Neurological examination of the intensity of motor symptoms was carried out in the morning after a 12 or 24 h break in taking antiparkinsonian drugs, then 1 h after they were taken. The intensity of motor symptoms was assessed with the help of Section III of the Unified PD Rating Scale of the International Society for Movement Disorders (UPDRS). The intensity of nonmotor symptoms was assessed with the help of the following scales: Hamilton Depression Rating Scale, the Pittsburgh Sleep Quality Index, the Epworth Sleepiness Scale, Nonmotor Symptoms Scale, and the 39-item Parkinson’s Disease Questionnaire.

Results: We found a statistically significant decrease in the severity of motor and nonmotor symptoms in the study group in the posttransplant period.

Conclusion: Positive results allow us to consider MSCs transplantation as a disease-modifying therapeutic strategy in PD. However, this method of PD treatment is not a fully understood process, which requires additional studies and a longer follow-up period to monitor the patients’ condition posttransplantation.

Keywords: Mesenchymal stem cells, Motor symptoms, Nonmotor symptoms

INTRODUCTION

Parkinson disease (PD) is a chronic, steadily progressive neurodegenerative disease. It leads to severe motor impairment, social disadaptation, and a decrease in the quality of patient’s life.

One of the most promising ways of treatment PD is based on the cellular technologies.[ 32 , 38 ] Cell therapy for PD was performed for the 1^st time in 1979.[ 23 ] Due to the progress in biotechnology, cell therapy is rapidly becoming a potential treatment option, changing the course of PD in patients.

Numerous experimental and clinical studies into PD therapy reference the application of cells of various origins: dopamine-secreting cells, fetal mesencephalon cells, embryonic stem cells, induced pluripotent stem cells, bone marrow stem cells (hematopoietic and mesenchymal cells), stem cells from other sources, and genetically modified cells.[ 28 ] Among them, the use of mesenchymal stem cells (MSCs) is one of the perspective directions of cellular therapy for many neurological disorders for the following reasons:

MSCs are easily obtained from various tissues[ 16 ]

Recently, interest in cell therapy using MSCs in scientific and clinical research has increased exponentially.[ 33 , 37 ] Clinical trials have demonstrated the possibility of safe transplantation of autologous MSCs in patients with cerebral stroke,[ 19 , 27 ] multiple sclerosis,[ 7 ] cerebral palsy,[ 14 ] and amyotrophic lateral sclerosis.[ 21 ] In PD, the possibility of introducing MSCs by intracerebral, intra-arterial, intrathecal, and intravenous route has been described.[ 4 , 34 , 35 ] The efficacy of cell therapy using MSCs transplantation was evaluated on animal models with parkinsonism.[ 3 , 25 ] These studies demonstrated a positive therapeutic effect of both intact and differentiated MSCs on the symptoms of laboratory animal models with parkinsonism, such as the reduction of the motor symptoms, normalization the level of dopamine and other neurotransmitters, an increase in the number of neurons in the damaged area, and a delay in the disease progression.[ 6 , 11 ] These encouraging results present a convincing argument to perform similar studies in PD patients.

Two methods of cell implantations that improve the neuroregenerative potential of MSCs with a minimal risk of surgical complications were considered for this study. Local or intranasal transplantation is affordable and minimally invasive.[ 31 ] Systemic or intravenous method is advantageous, as it allows to easily perform repeated administrations and stimulate systemic immunomodulatory effects, relevant in conditions of neuroinflammation in PD.[ 9 ]

MATERIALS AND METHODS

The timeline of the study

By the end of 2018, we have successfully completed the preclinical stage of our research.[ 1 ] In November 2018, the clinical phase of our study was initiated. On January 17, 2019, the first autologous MSCs transplantation to a patient with PD was performed in the neurosurgical department of our clinical hospital. At present, the number of patients in the posttransplant period has increased to 12. Our objective was to make an assessment of the immediate results of the MSCs introduction effectiveness on motor and nonmotor symptoms in patients with PD.

The clinical examination of PD patients

Clinical examination at the selection stage included the clarification of complaints, the history of the disease, neurological examination, and neuroimaging (CT and MRI 1.5 T). In addition, the age of onset of PD, its duration and type of flow, family history of PD, the presence of nonmotor manifestations, chronic inflammatory diseases, significant stressful situations, and work with herbicides in history were specified. Furthermore, the duration of antiparkinsonian drugs usage, the regimen of their administration, the side effects, and another therapy were clarified. The diagnosis of PD was established in all participants of the current study in accordance with the United Kingdom Parkinson’s Disease Society Brain Bank clinical diagnostic criteria.[ 15 ] The clinical stage of the disease was indicated in the diagnosis in accordance with Hoehn and Yahr scale in the modification of Lindvall et al. (1998). The selection criteria and contraindications listed below are based on the opinions of foreign experts and our own experience.

The selection criteria:

A reliable diagnosis of Parkinson’s disease, according to, in accordance with, the United Kingdom Parkinson’s Disease Society Brain Bank clinical diagnostic criteria (UK Brain Bank Criteria, 1992)

The contraindications:

Parkinsonism and parkinsonism-plus syndromes

Collection of the cellular material from patients with PD, who were subject to MSCs transplantation, was performed from the posterior upper crest of an iliac bone according to the standard method.

Preclinical work

Mononuclear cells from bone marrow punctate were isolated by the standard method of separation on the ficoll-verographin gradient (P = 1.077). The suspension was centrifuged for 10 min at 1500 rpm/min at room temperature. The pellet was resuspended in 10–15 ml of medium for culturing MSCs. The cell suspension was adjusted to the inoculum concentration with culture medium for MSCs and plated in culture vials. They were placed in a CO₂ incubator (37°C, 5% CO₂, 90% humidity). After 24–48 h of incubation, cells that had not been adhered to the surface of the vial were washed 3 times with a stream of sterile PBS, after which the vials were filled with specialized medium for culturing MSCs. Every 3–4 days, ½ of the volume of the cultivation medium was changed. At 70–80% confluency stage, the cells were removed from the surface of the culture vial using a trypsin/EDTA solution. Then, they were seeded into plastic sterile vials for adhesive cultures with gas permeable caps to obtain the first passage. When the first passage reached 75–90% confluency, the cells were reseeded to obtain subsequent passages until the amount of MSCs necessary for therapy was achieved.

Clinical study

The transplantation of autologous MSCs in patients with PD was performed using two methods, based on the literature data and our own experience with experimental animals in preparation for this study.[ 24 , 31 , 39 ]

Systemic (intravenous) administration method: the total dose of cells (0.5–2.0 million/kg of patient’s weight) is administered slowly intravenously in three stages with an interval of 7 days

The choice between systemic or tandem cell administrations was determined on the individual basis, considering the expected benefits and potential risks.

Effectiveness of the therapy was evaluated before the transplantation (day 0) and after the introduction of MSCs (month 1 and month 3) according to the effect on the motor and nonmotor symptoms. Nonmotor symptoms were assessed with help of the following scales: Hamilton Depression Rating Scale (HDRS), Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale (ESS), Nonmotor Symptoms Scale (NMS), and the 39-item Parkinson’s Disease Questionnaire (PDQ-39).

The severity of motor symptoms of PD was evaluated on the basis of Section III of the Unified Parkinson’s Disease Rating Scale (MDS-UPDRS) of the International Society for Movement Disorders (2008). The assessment of motor functions was performed in the morning after a 12–24 h break in taking antiparkinsonian drugs (off-period), then 1 h after they were taken (on-period).

Statistical data processing was performed using the Statistica 8.0 package. The data obtained are presented as the median with an interquartile interval (25–75^th percentile). Comparison of the results of the two groups and determination of the statistical significance of the differences were carried out using nonparametric Wilcoxon criteria and the Mann–Whitney U-test. Differences were recognized as statistically significant at P <0.05.

RESULTS

The study group consisted of 12 patients (m:f – 7:5) with a diagnosis of PD, randomized by sex and age, who underwent cell therapy of MSCs in various combinations: systemic or tandem administration. The average age of the patients was 52.0 (39.5; 59.0) years, the duration of the disease was 7.0 (5.0; 8.0) years, the severity of the disease according to the Hoehn and Yahr scale was 2.0 (2.0; 3.0) points. The details of these patients are mentioned in Table 1 .

Table 1:

The details of the patients from the study group.

The comparison group included 11 patients (m:f – 6:5) with a diagnosis of PD, randomized by sex and age, received drug treatment with levodopa drugs, dopamine receptor agonists, and amantadine. The control subjects did not receive any injection, including placebo. The average age of the patients was 52.0 (47.5; 62.5) years, the duration of the disease was 6.0 (4.0; 7.0) years, and the severity of the disease on the Hoehn and Yahr scale was 2.0 (2.0; 2.0) points.

There were no statistically significant differences in gender, age, and stage of the disease distribution between the two groups (P > 0.05 according to Mann–Whitney U-test).

We revealed statistically significant differences (P = 0.02) between the MDSUPDRS score (Section III) before treatment (Me = 36.5 [30.0; 57.5]) and the score in month 1 (Me = 33.5 [26.0; 52.5]) in the off-period in the study group. The difference amounted to 9%. The achieved result was maintained for 3 months after transplantation (Me = 32.0 [23.0; 40.0]). In the on-period, statistically significant differences between the score before therapy (Me = 20.0 [15.5; 34.0]) and month 1 (Me = 22.0 [14.5; 31.0]), (P = 0.18), and in month 1 and month 3 (Me =19.0 [15.0; 31.0], [P = 0.2]) were not detected.

In the comparison group, statistically significant differences between the score in day 0 (Me = 20.0 [15.5; 34.0]) and in month 1 (Me = 22.0 [14.5; 31.0]), (P = 0.18), and in month 1 and month 3 (Me = 19.0 [15.0; 31.0], [P = 0.2]) were not detected both in the off- and on-periods.

An improvement of mood, significant decrease in daytime sleepiness, and the patients’ sleep quality were identified in the study group. By month 1, 36% decrease in score according to the Hamilton depression scale was observed compared to day 0 (P = 0.02). The improvement of mood and a decreased depressive mood were also detected after 3 months (P = 0.01) and amounted to 44%. By the month 3, sleep quality assessed by the PSQI scale, improved by 46% compared to the initial data, and daytime sleepiness, assessed by the Epworth scale, decreased by 42% [ Table 2 ].

Table 2:

The intensity of nonmotor symptoms in the study group before the transplantation, 1 month, and 3 months after the introduction of MSCs (Me, Q25-Q75).

There was also a statistically significant increase (P = 0.003) in the overall quality of life by the PDQ-39 scale. The achieved result was maintained for 3 months after transplantation (P = 0.01).

There was no statistically significant difference when assessing the same symptoms in the dynamics in the comparison group (P ≥ 0.05) [ Table 3 ].

Table 3:

The intensity of nonmotor symptoms in the comparison group in the baseline day, 1 month, and 3 months later (Me, Q25-Q75).

Effectiveness of the therapy was also assessed by the NMS scale. A tendency toward a decreased total number of nonmotor manifestations of PD between day 0 (Me = 8.0 [6.0; 13.5]) and month 3 (Me = 7.0 [6.0; 10.5]) [ Table 1 ] has also been revealed. In contrast, the patients from the comparison group during the same observation period showed a tendency to the symptoms’ increase [ Table 3 ].

DISCUSSION

At present, it is established that MSCs, similar to leukocytes, express a variety of receptors and cell adhesion molecules involved in homing and migration to the lesion sites both with local and systemic routes of administration.[ 8 , 13 , 22 , 29 ]

Experimental models of rodents have shown that if introduced through the intranasal route, MSCs are able to migrate to the brain as early as the 1^st day after the administration and are present at the lesion site for 3 weeks or more.[ 26 , 31 , 39 ] In these studies, the implanted stem cells have shown a pronounced neurotrophic effect by producing growth factors, such as GDNF, BDNF, NGF, IGF-1, and VEGF. In addition, there is ample evidence that MSCs support the structural organization of both individual brain cells and the neuronal network as a whole, and contribute to the survival of neurons and oligodendrocytes in neurodestructive conditions.[ 18 ] Moreover, by exerting an immunoregulatory effect on both local and systemic levels,[ 5 ] MSCs decrease the inflammatory response from microglial cells, and, thus, restore the functional activity of neurons.[ 17 , 20 ]

At present, only preliminary data are available on the use of MSCs in human PD.[ 30 ] In an open-label study in 2010, Indian researchers administered 10⁶ autologous bone marrow-derived MSCs per kilogram body weight unilaterally into the sublateral ventricular zone through stereotactic surgery in seven patients with PD.[ 34 ] The procedure was well tolerated. Three out of seven patients were reported to have lasting improvement in the unified Parkinson’s disease rating scale and other rating scales compared to baseline. In agreement with our findings, this study also demonstrates that intranasal and tandem (intranasal + intravenous) methods of autologous MSCs administration are safe and have beneficial neuroprotective and neurorestorative effects.

At this stage of the study, given a short period of the postoperative follow-up, we cannot fully exclude the influence of the possible placebo effect, which most often occurs in the early stages of open research.[ 10 ] Patient evaluation using standardized scales and a long period of posttransplant observation will help to answer this question definitively.

Undoubtedly, the data obtained are only preliminary, and there is a need for more detailed and lengthy study. In future, an additional set of evaluation studies is planned, along with an increased number of the transplanted MSCs.

Due to the fact that the lifetime of MSCs in the body is limited to several weeks, it is important to study the long-term effects of their transplantation in PD, the effectiveness of repeated MSCs reintroduction, and the time intervals over which they must be carried out.

CONCLUSION

The treatment of patients with PD with the use of MSCs has produced encouraging results that suggest influence on many symptoms of the PD pathogenesis, as well as their capability to modify the course of the disease and provide control over the manifestations of the motor symptoms of the disease. Our data demonstrate a decrease in the severity of motor and nonmotor symptoms of the disease in the posttransplant period. These encouraging results allow us to consider the application of MSCs in PD as a therapy modifying the course of the disease. However, this method of PD treatment is not a fully understood process, which requires additional studies and a longer follow-up period in the posttransplant period.

Declaration of patient consent

Patient’s consent not required as patients identity is not disclosed or compromised.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

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