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Neuroregenerative potential of intravenous G-CSF and autologous peripheral blood stem cells in children with cerebral palsy: a randomized, double-blind, cross-over study

  • 1,
  • 1, 2, 3Email author,
  • 1,
  • 1,
  • 1,
  • 1, 2,
  • 2,
  • 4,
  • 4,
  • 5,
  • 5,
  • 6,
  • 6 and
  • 3
Journal of Translational Medicine201715:16

https://doi.org/10.1186/s12967-017-1120-0

©  The Author(s) 2017

  • Received: 5 December 2016
  • Accepted: 6 January 2017
  • Published:

Abstract

Objective

We performed a randomized, double-blind, cross-over study to assess the neuroregenerative potential of intravenous granulocyte colony-stimulating factor (G-CSF) followed by infusion of mobilized peripheral blood mononuclear cells (mPBMCs) in children with cerebral palsy (CP).

Methods

Children with non-severe CP were enrolled in this study. G-CSF was administered for 5 days, then mPBMCs were collected by apheresis and cryopreserved. One month later (M1), recipients were randomized to receive either mPBMCs or a placebo infusion, and these treatment groups were switched at 7 months (M7) and observed for another 6 months (M13). We assessed the efficacy of treatment by evaluating neurodevelopmental tests, as well as by brain magnetic resonance imaging-diffusion tensor imaging (MRI-DTI) and 18F-fluorodeoxyglucose (FDG) brain positron emission tomography-computed tomography (PET-CT) scanning to evaluate the anatomical and functional changes in the brain.

Results

Fifty-seven patients aged 4.3 ± 1.9 (range 2–10) years and weighing 16.6 ± 4.9 (range 11.6–56.0) kg were enrolled in this study. The administration of G-CSF as well as the collection and reinfusion of mPBMCs were safe and tolerable. The yield of mPBMCs was comparable to that reported in studies of pediatric donors without CP and patients with nonhematologic diseases. 42.6% of the patients responded to the treatment with higher neurodevelopmental scores than would normally be expected. In addition, larger changes in neurodevelopment test scores were observed in the 1 month after G-CSF administration (M0–M1) than during the 6 months after reinfusion with mPBMCs or placebo (M1–M7 or M7–M13). Patients who received G-CSF followed by mPBMC infusion at 7 months (T7 group) demonstrated significantly more neurodevelopmental improvement than patients who received G-CSF followed by mPBMC infusion at 1 month (T1 group). In contrast to the results of neurodevelopment tests, the results of MRI-DTI at the end of this study showed greater improvement in the T1 group. Although we observed metabolic changes to the cerebellum, thalamus and cerebral cortex in the 18F-FDG brain PET-CT scans, there were no significant differences in such changes between the mPBMC and placebo group or between the T1 and T7 group.

Conclusions

Neurodevelopmental improvement was seen in response to intravenous G-CSF followed by mPBMC reinfusion, particularly to the G-CSF alone even without mPBMC reinfusion. Further studies using a larger number of mPBMCs for the infusion which could be collected by repeated cycles of apheresis or using repeated cycles of G-CSF alone, are needed to clarify the effect of mPBMC reinfusion or G-CSF alone (Trial registration: ClinicalTrials.gov, NCT02983708. Registered 5 December, 2016, retrospectively registered).

Keywords

  • Cerebral palsy
  • Granulocyte colony-stimulating factor
  • Mobilized peripheral blood mononuclear cells
  • Neuroregeneration

Background

Children with cerebral palsy (CP) have disabilities both from motor impairment and from related disorders in other functions, including sensation, cognition, communication, vision, and behavior. Although various strategies have been used to improve neurologic impairment in patients with CP, most strategies used to date are complementary therapies, and there is currently no medical treatment that can repair the damaged nervous tissues [1]. Recent studies revealed that persistent neuroinflammation and associated apoptosis in brains affected by CP could be therapeutic targets [2]. Apoptosis is an attractive target because anti-apoptotic agents could be used to reverse apoptosis during a therapeutic time window after hypoxia-induced injury [3]. Other potential therapeutic targets include hematopoietic growth factors, such as erythropoietin (EPO) and granulocyte colony-stimulating factor (G-CSF), which influence the proliferation of neural stem and progenitor cells. EPO and G-CSF have specific receptors in the brain and both factors are produced in the brain [4, 5]. Therefore, EPO and G-CSF have been investigated for their ability to stop neurodegenerative conditions [6, 7].

Recently, cell therapy has emerged as a potential treatment for patients with CP. Bone marrow (BM)- or cord blood (CB)-derived mesenchymal stem cells (MSCs) have generally been used for cell therapy. In addition, intravenous CB mononuclear cells (CB MNCs) or intrathecal BM MNCs have been also assessed for safety and efficacy in children with CP [8–12]. Studies show that in children with CP recovery from neurologic impairment is promising, but not complete, following stem cell therapy with CB MNCs. However, there are limitations to the use of CB MNCs and BM MNCs for repeated therapy, as there is only one opportunity to collect CB MNCs, and the procedure for extracting BM MNCs is very invasive in children with CP.

We hypothesized that mobilized peripheral blood mononuclear cells (mPBMCs) would be a better source of cell therapy for children with CP, if these cells had a similar neuroregenerative potential to BM/CB MNCs. Multipotent precursor cells exist in peripheral blood, and a fraction of elutriated blood cells from normal individuals contains MNCs that have the potential to be MSCs [13]. There are several advantages to using mPBMCs for cell therapy in children with CP: the G-CSF that is used to mobilize peripheral blood mononuclear cells (PBMCs) has neuroregenerative potential; the collection and fractionation of stem cells can be repeated; and, the therapy is suitable for most children with CP. So far, there have been no clinical trials of cell therapy with autologous mPBMCs for children with CP. The current study describes a randomized, double-blind, cross-over study of intravenous G-CSF followed by infusion with autologous mPBMCs in children with CP to determine the safety and feasibility of the procedure, as well as the potential efficacy for improving neurological impairment.

Methods

Study design

Patients were included in the study if they were between 2 and 10 years of age and had a non-severe type of CP After baseline studies at enrollment (M0), intravenous G-CSF of 10 μg/kg was administered for 5 days. On the fifth day mPBMCs were collected with a single-day course of apheresis and then cryopreserved (Fig. 1). The detailed apheresis procedure is described in our previous study [14]. One month after cryopreservation of the mPBMCs (M1), patients were randomized to receive either mPBMCs or placebo. Six months after randomization (M7), cross-over infusion of mPBMCs or placebo was performed and the patients were observed for another 6 months. During the study, comprehensive physiotherapy and occupational therapy for individual patients were not modified. We assessed the neurodevelopmental status of patients at M0, M1, M7, and M13 after enrollment using various evaluation tools for neurodevelopmental tests. Brain magnetic resonance imaging-diffusion tensor image (MRI-DTI) and brain positron emission tomography-computed tomography (PET-CT) were used to evaluate the anatomical and functional changes in the brain at enrollment (M0), M7, and M13. This study was approved by the Institutional Review Board of Hanyang University Hospital (201103002).
Fig. 1
Fig. 1

Design of the clinical study. MRI-DTI magnetic resonance imaging-diffusion tensor imaging; PET positron emission tomography; G-CSF granulocyte colony-stimulating factor; mPBMC mobilized peripheral blood mononuclear cell. M0, M1, M7 and M13 refer to months after enrollment. T1 and T7 refer to a group who received mPBMC at 1 and 7 months of study, respectively

Evaluation of neurodevelopment

We assessed the parents’ feeling for the changes of motor or cognitive functions during study periods of their children, which even could not provide the clear and objective information on the neurodevelopmental evaluation. Comprehensive neurodevelopmental examinations were performed using the Denver development screening test II (DDST-II) to assess gross developmental screening, the pediatric evaluation of disability inventory (PEDI) to assess detailed developmental, the gross motor function classification system (GMFCS) to assess gross motor function staging, the gross motor function measure-88 (GMFM) to assess detailed motor function, the manual ability classification system (MACS) to assess fine motor staging, and the quality of upper extremity skill test (QUEST) to assess fine motor function. The results for each examination tool were evaluated by well-trained physical and occupational therapists, and therapeutic responses were comprehensively assessed by rehabilitation specialists.

Neuroimaging studies

Brain MRI

All patients underwent MRI examination using a 3.0T system (Achieva, Philips, Best, Netherlands). Conventional images including axial T1-weighted, T2-weighted, and fluid-attenuated inversion recovery (FLAIR) were obtained for the anatomical evaluation. DTI data were obtained for the functional evaluation using a single shot echo planar sequence with the following parameters; 15 diffusion gradient directions, maximum b value = 800 s/mm2, TR/TE = 9000/55 ms, slice thickness = 2 mm. The DTI datasets were transferred to a workstation for processing. Fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values for 18 regions of interest (ROIs) were obtained from the DTI data. All ROIs were set and analyzed by a pediatric neurologist.

Brain PET-CT scanning

Brain PET images were acquired using a dedicated PET-CT system (Biograph 6, Siemens Medical System, Knoxville, TN) at M0, M7, and M13 to monitor metabolic improvements of the brain. The patients fasted at least 6 h prior to PET-CT scanning. After intravenous injection of 18F-FDG (3.7 MBq/kg, 33–207 MBq), patients waited for 60 min in a dark room with a dim light before imaging, while 18F-FDG was distributed in brain. PET scans were obtained for 10 min, and images were reconstructed with a 168 × 168 matrix (pixel size = 1.95 × 1.95 mm with a slice thickness of 3.0 mm), and the ordered subset expectation maximum iterative reconstruction algorithm, an 5 mm Gaussian filter, and a 30 cm field of view. Two board-certified nuclear medicine physicians reviewed all three set of individual subject by visual assessment in consensus to check for the differences between the mPBMC group and placebo group, as well as T1 group and T7 group.

Data analyses

We analyzed the following: safety and yield of G-CSF-mobilized PBMC collection; outcomes at M13; the booster effect of mPBMC infusion (by comparing the mPBMC group and the placebo group); and, outcomes according to mPBMC infusion time (T1 group: mPBMC infusion at 1 month after G-CSF infusion; T7 group: mPBMC infusion at 7 months after G-CSF infusion). The statistical software SAS for Windows (version 9.4, Cary, NC, USA) was used for data analysis. Logistic regression was used to analyze parental assessments, and the Mann–Whitney U test was used to analyze the neurodevelopment tests. The Wilcoxon rank sum test was used to analyze data from the brain MRI-DTI and PET-CT scans. P values ≤0.05 were considered to be statistically significant.

Results

Demographic data

Fifty-seven patients were enrolled in the current study and their mean age and body weight were 4.3 ± 1.9 years (range 2–10 years) and 16.6 ± 4.9 kg (range 11.6–56.0 kg), respectively. Types of CP were as follows: 31 diplegia, 15 hemiplegia, 11 others (triplegia, ataxic, athetoid). Possible causes of CP were periventricular leukomalacia (n = 37), hypoxic ischemic encephalopathy (n = 2), intracranial hemorrhage (n = 2), and unknown (n = 16). Forty-seven patients for whom complete study data were available were included in this analysis.

Safety of G-CSF administration and yield of PBMCs

G-CSF-mobilized PBMC collection was safe in children with CP. We observed only two cases of fever and one episode of irritability during the G-CSF infusion. Transient hemoglobinuria (n = 3) and abdominal pain (n = 1) were reported during the mPBMC infusion, and these were resolved with supportive treatments. The total nucleated cell (TNC) count of mPBMCs was 5.97 ± 1.99 × 108/kg, and the TNC count of CD34+ cells was 3.07 ± 2.1 × 106/kg. Pre-freezing and post-thawing cell data were not significantly different between the two groups (T1 and T7), except for the post-thawing TNC counts, where the TNC count was significantly higher in the T7 group (Table 1).
Table 1

Cell counts of cryopreserved and infused mPBMCs

  

T1 (N = 28)

T7 (N = 29)

p

Pre-freezing

TNC (×108/kg)

5.84 ± 2.18

6.09 ± 1.89

0.574

CD34 (×106/kg)

3.16 ± 2.72

2.99 ± 1.40

0.678

Post-thawing

TNC (×108/kg)

4.63 ± 2.88

6.20 ± 1.94

0.018

CD34 (×106/kg)

1.92 ± 1.99

1.75 ± 1.07

0.837

mPBMC mobilized peripheral blood mononuclear cell; TNC total nucleated cell; T1 and T7 refer to a group who received mPBMC at 1 and 7 months of study, respectively

Parental assessments

Even before randomization for mPBMC infusion at M1 (i.e. during the one month after G-CSF administration), functional changes were noted by parents of 27 patients from the total group of 47 patients. After randomization, at M13, functional changes were noted by parents of 41 patients in the mPBMC group and by parents of 45 patients in the placebo group, although this difference was not statistically significant. There were also no significant differences in the functional changes recorded by parents at M13 between the T1 and T7 groups (Table 2).
Table 2

Number of patients for functional improvement by parental assessment according to randomization (before vs after) and time of mPBMC infusion (T1 vs T7)

 

Before randomization

After randomization

T1

T7

p*

Placebo

mPBMC

p +

Cognitive function

19

31

23

0.09

8

11

0.59

Motor function

3

0

2

0.15

0

0

–

Cognitive + motor function

5

14

16

0.65

13

14

0.83

No interval change

20

2

6

0.13

1

0

0.28

mPBMC mobilized peripheral blood mononuclear cell; T1 and T7 refer to a group who received mPBMC at 1 and 7 months of study, respectively

+ p indicates statistical significances of items between placebo and mPBMC groups

*p indicates statistical significances of items between before T1 and T7 groups

Neurodevelopmental tests

Although we observed no significant changes in the GMFCS and MACS domains, 20 of 47 patients (42.6%) showed overall improvement at M13 in the domains of GMFM, PEDI and QUEST. We defined overall improvement as a score change in GMFM >4 points and/or score changes in PEDI >7 points in at least three items. The clinical characteristics of patients according to their overall therapeutic response are shown in Table 3. There were no risk factors associated with therapeutic responses; however, the number of responders was significantly higher in the T7 group than in the T1 group (p = 0.028). When comparing T1 and T7 groups (Table 4), the only significant score improvements were in the overall GMFM and GMFM-crawling domains, and these improvements were observed between enrollment and completion of study (M0–M13). Furthermore, when we compared the change in score after randomization (M1–M13), the GMFM, GMFM-crawling and GMFM-sitting domains showed significant improvement in the T7 group compared to the T1 group. Although there were no significant differences in neurodevelopment score improvement between mPBMC and placebo groups after randomization, more significant score changes in the GMFM, PEDI, and QUEST domains were observed before randomization (Table 5).
Table 3

Clinical characteristics according to overall therapeutic response, as measured by neurodevelopment tests

 

Total (number or mean ± SD)

Responder (N = 20)a

Non-responder (N = 27)

p

Sex

   

0.915

 Male

25

11

14

 

 Female

22

9

13

 

Age (years)

4.1 ± 1.9

3.2 ± 1.5

4.7 ± 1.9

0.968

Body weight (kg)

16.6 ± 7.70

13. 8 ± 2.57

18.5 ± 9.35

0.142

Infused TNC (×108/kg)

5.2 ± 2.54

5.7 ± 1.52

4.8 ± 3.04

0.847

CP type

   

0.215

 Diplegia

25

10

15

 

 Non-diplegia

22

10

12

 

Infusion time

   

0.028

 T1

22

5

17

 

 T7

25

15

10

 

CP cerebral palsy; T1 and T7 refer to a group who received mobilized peripheral blood mononuclear cell at 1 and 7 months of study, respectively

aResponder refers to a patient showing overall improvement at M13 as measured by neurodevelopment tests

Table 4

Change in neurodevelopment test score according to time of mPBMC infusion

 

M0–M13

M1–M13

T1

T7

p

T1

T7

p

GMFM

4.28

8.30

0.002

2.90

6.37

0.001

 Lying

1.34

1.33

0.398

0.89

0.71

0.780

 Sitting

2.65

9.08

0.103

1.74

7.35

0.044

 Crawling

5.19

12.86

0.010

2.92

10.41

0.002

 Standing

4.78

7.18

0.093

3.50

5.13

0.079

 Walking

7.45

10.02

0.391

5.43

8.45

0.198

PEDI_selfcare

8.64

8.13

0.370

5.58

6.54

0.204

 Mobility

8.86

10.00

0.856

6.35

6.53

0.621

 Social function

13.78

9.33

0.327

9.54

6.28

0.296

 Selfcare (caregiver)

7.88

10.92

0.228

5.54

8.44

0.455

 Mobility (caregiver)

4.90

7.28

0.221

3.29

6.22

0.052

 Social function (caregiver)

11.45

14.65

0.236

8.87

12.13

0.208

QUEST

21.28

25.66

0.394

13.79

18.44

0.183

mPBMC mobilized peripheral blood mononuclear cell; GMFM gross motor function measure; PEDI pediatric evaluation of disability inventory; QUEST quality of upper extremity skills test. M0, M1, and M13 refer to months after enrollment. T1 and T7 refer to a group who received mPBMC at 1 and 7 months of study, respectively

Table 5

Changes in neurodevelopment test scores according to randomization

 

Before randomization (M0–M1)

After randomization (M1–M7 or M7–M13)

p*

Placebo

mPBMC

p +

GMFM

1.6738

0.4000

0.3725

0.479

0.001

PEDI_C

2.2787

0.5180

0.4928

0.764

0.006

PEDI_M

3.0212

0.6187

0.5419

0.998

0.005

PEDI_F

3.6106

0.6665

0.6536

0.930

0.042

PEDI_CC

2.4127

0.6115

0.5549

0.736

0.057

PEDI_MC

1.3191

0.5366

0.2558

0.092

0.030

PEDI_FC

2.5148

1.1481

0.6079

0.040

0.022

QUEST

9.0497

1.0815

1.3392

0.949

0.047

mPBMC mobilized peripheral blood marrow cell; GMFM gross motor function measure; PEDI_C pediatric evaluation of disability inventory self-care; PEDI_M pediatric evaluation of disability inventory mobility; PEDI_F pediatric evaluation of disability inventory social function; PEDI_CC pediatric evaluation of disability inventory mobility self-care with caregiver assistance; PEDI_MC pediatric evaluation of disability inventory mobility with caregiver assistance; PEDI_FC pediatric evaluation of disability inventory mobility social function with caregiver assistance; QUEST quality of upper extremity skills test

M0, M1, M7 and M13 refer to months after enrollment

+ p indicates statistical significances of items between placebo and mPBMC groups

* p indicates statistical significances of items between before randomization and after randomization

Brain MRI-DTI scanning

In the MRI-DTI scans, there was a trend of increasing FA values and decreasing ADC values over time (M0–M13). However, these trends were not statistically significant, and there were also no significant differences between mPBMC and placebo groups (M1–M7 and M7–M13) in FA or ADC values in any ROIs. To evaluate the effect of mPBMC infusion on the changes in MRI-DTI scans, we analyzed the data according to the time of mPBMC infusion. The FA and ADC values were significantly greater in the T1 group than in the T7 group for the left corona radiata (CRL), left posterior limb of internal capsule (PLL), and the ADC values were significantly decreased in genu ROIs between M0 and M13 (Table 6), and in PLL ROI between M0 and M7 (Table 6). However, there were no significant differences in any ROI between M7 and M13.
Table 6

Changes in FA and ADC values

ROI

FA

ADC

T1

T7

p

T1

T7

p

a Changes in FA and ADC values between M0 and M13

CRR

0.028

0.035

0.849

0.017

−0.018

0.723

CRL

0.056

0.029

0.032

−0.016

−0.015

0.935

PLR

0.057

0.020

0.144

−0.023

−0.013

0.643

PLL

0.039

0.018

0.010

−0.057

0.039

0.010

MBR

−0.010

0.028

0.397

0.001

0.121

0.723

MBL

0.024

0.001

0.349

−0.079

0.004

0.238

PonsR

−0.010

0.011

0.071

−0.047

−0.051

0.849

PonsL

0.027

0.035

0.892

−0.049

0.016

0.041

PTRR

0.023

0.010

0.643

0.008

0.022

0.683

PTRL

0.016

−0.013

0.367

−0.003

−0.009

0.935

FR

0.023

0.006

0.807

−0.003

0.008

0.978

FL

−0.003

0.000

0.605

−0.023

0.028

0.238

TR

0.046

0.004

0.367

−0.154

−0.045

0.683

TL

0.043

0.030

0.683

−0.002

0.003

0.849

OR

0.024

0.023

0.935

0.033

0.009

0.531

OL

0.023

0.039

0.461

0.025

−0.035

0.605

Genu

0.055

0.027

0.238

−0.35

−0.001

0.026

Spl

0.019

0.044

0.285

0.004

−0.112

0.091

b Changes in FA and ADC values between M0 and M7

CRR

−0.011

0.041

0.070

−0.055

−0.034

0.845

CRL

0.017

0.009

0.499

−0.059

−0.033

1.000

PLR

0.003

−0.005

0.963

−0.058

−0.019

0.767

PLL

0.028

0.016

0.521

−0.084

0.009

0.020

MBR

−0.008

−0.003

0.521

−0.023

0.180

0.181

MBL

0.017

−0.007

0.481

−0.028

−0.053

0.913

PonsR

0.006

−0.007

0.964

−0.074

−0.017

0.105

PonsL

0.028

0.011

0.775

−0.063

−0.003

0.284

PTRR

−0.011

0.019

0.424

−0.033

0.019

0.839

PTRL

−0.003

−0.011

0.696

−0.045

−0.071

0.462

FR

0.013

−0.015

0.189

−0.063

−0.002

0.313

FL

−0.003

−0.035

0.298

−0.060

0.011

0.599

TR

0.006

0.007

0.845

−0.125

−0.031

0.940

TL

0.007

0.017

0.408

−0.047

−0.011

0.775

OR

−0.010

0.002

0.397

−0.044

−0.012

0.415

OL

−0.005

0.005

0.754

−0.095

−0.048

0.397

Genu

0.032

0.002

0.271

−0.107

0.025

0.070

Spl

−0.026

0.001

0.093

0.033

−0.040

0.490

M0, M7, and M13 refer to months after enrollment

FA fractional anisotropy; ADC apparent diffusion coefficient; ROI region of interest; CRR corona radiata, right; CRL corona radiata, left; PLR internal capsule, posterior limb, right; PLL internal capsule, posterior limb, left; MBR midbrain, right; MBL midbrain, left; PonsR pons, right; PonsL pons, left; PTRR posterior thalamic radiation, right; PTRL posterior thalamic radiation, left; FR frontal, right; FL frontal, left; TR temporal right; TL temporal left; OR occipital right; OL occipital left; Spl splenium

Brain PET-CT scanning

Although we observed metabolic changes to the cerebellum, thalamus and cerebral cortex in the brain PET-CT, there were no significant differences in the incidence of metabolic changes between the mPBMC and placebo groups, or between the T1 and T7 groups.

Discussion

We have performed a clinical trial using G-CSF and mobilized PBMCs in patients with CP, based upon the following backgrounds. The use of G-CSF in children with CP is ethical and beneficial because it is already proven to be safe in normal volunteer donors [15, 16], and G-CSF has the potential to induce neuroregeneration in patients with neurodegenerative diseases [5, 7]. Also, the mobilization and apheresis of mPBMCs in children are safe and effective [15], and mPBMCs contain MSCs which can be isolated and then secrete various cytokines potentially able to repair the damaged tissues [13, 17]. Additionally, we have previously reported upon the safety of administering G-CSF and collecting mPBMCs in children with CP [14], and we have also reported on the intracellular expression of neurotrophic factors and inflammatory cytokines, which could exert a neuroregenerative effect, in mPBMCs from children with CP [17].

In the current study, we demonstrated that G-CSF administration and collection/reinfusion of mPBMCs were safe and tolerable in children with CP. A single-day apheresis in children with CP yielded TNC counts of 5.97 ± 1.99 × 108/kg, and CD34+ cell counts of 3.07 ± 2.1 × 106/kg. These numbers are sufficient for hematopoietic reconstitution, although the target dose of MNCs or MSCs for cell therapy is yet to be determined. The yield of mPBMCs from children with CP was comparable to the yield from normal pediatric donors and patients with nonhematologic disease, reported in other studies [18, 19]. We cryopreserved all collected mPBMCs for at least 1 month and then reinfused them (after randomization) at 1 month or 7 months. With this protocol, we tried to reveal the neuroregenerative effect of G-CSF alone, without circulating mPBMCs, as well as any possible augmented effect following reinfusion with mPBMCs.

We observed that 42.6% of patients showed overall responses in the neurodevelopment tests than would normally be expected. In addition, the largest neurodevelopment score improvements were obtained during 1 month after G-CSF administration followed by mPBMC collection (M0–M1), suggesting that G-CSF alone, irrespective of circulating mPBMCs, can counter neurological impairment in children with CP. We also tried to assess the booster effects of mPBMCs on neurodevelopmental functions. Compared to the placebo group, the group that had a mPBMC infusion at 7 months experienced a greater improvement in neurodevelopmental functions than the group receiving a mPBMC infusion at 1 month. However, it should be pointed out that the higher infused cell doses in the T7 group were associated with neurodevelopmental improvement, because there is, as yet, no evidence that cell dose has an effect on neurologic improvements. In addition, Hara [20] and Hayashiji [21] reported that G-CSF positively affects the recovery of muscle mass, therefore delayed effect of G-CSF on muscle regeneration may be contributed to synergistic improvement of neurodevelopmental functions in T7 group. Contrary to the results from neurodevelopment tests, MRI-DTI showed greater increase of FA values in the CRL, PLL, and Genu ROIs in the T1 group than in the T7 group, indicating that the neuroregenerative effect of G-CSF coupled with mPBMC infusion is higher at 1 month than at 7 months.

Given these differences between the results of neurodevelopment tests and the changes observed in MRI-DTI scans, the neuroregenerative effect of mPBMC reinfusion may be minimal and/or the additive effect of G-CSF on the central nervous system as well as muscles could be considered. Furthermore, the collection and reinfusion of mPBMCs after G-CSF administration may not be essential because G-CSF could synergize with endogenous circulating mPBMCs. Although we could not demonstrate the effect of G-CSF on muscle and an additional effect of mPBMCs on the changes of FA/ADC values in the MRI-DTI scans, several investigators have found a correlation between ROI-based FA and clinical motor outcome in children with CP [22–24]. Therefore, future studies using MRI-DTI would be needed to reveal the association of infusion timing or cell doses of mPBMCs and clinical outcomes in children with CP.

Conclusion

We observed a neuroregenerative potential of intravenous G-CSF followed by mPBMC reinfusion. The neurodevelopmental improvement observed may have been caused by G-CSF alone without a contribution from the reinfused mPBMCs. Further studies using higher concentrations of mPBMCs which could be collected by repeated cycles of apheresis or using repeated cycles of G-CSF alone are needed to clarify any benefit of mPBMC reinfusion or G-CSF alone.

Abbreviations

G-CSF: 

granulocyte colony-stimulating factor

mPBMC: 

mobilized peripheral blood mononuclear cells

CP: 

cerebral palsy

M0: 

month at enrollment

M1: 

1 month after enrollment

M7: 

7 months after enrollment

M13: 

13 months after enrollment

MRI-DTI: 

magnetic resonance imaging-diffusion tensor imaging

FDG: 

18F-fluorodeoxyglucose

PET-CT: 

positron emission tomography-computed tomography

T1: 

group for mPBMC infusion at 1 month

T7: 

group for mPBMC infusion at 7 months

EPO: 

erythropoietin

BM: 

bone marrow

CB: 

cord blood

MSCs: 

mesenchymal stem cells

MNCs: 

mononuclear cells

DDST II: 

Denver development screening test II

PEDI: 

pediatric evaluation of disability inventory

GMFCS: 

gross motor function classification system

MACS: 

manual ability classification system

QUEST: 

quality of upper extremity skill test

FLAIR: 

fluid-attenuated inversion recovery

FA: 

fractional anisotropy

ADC: 

apparent diffusion coefficient

ROIs: 

regions of interest

TNC: 

total nucleated cell

CRL: 

left corona radiata

PLL: 

left posterior limb of internal capsule

Declarations

Authors’ contributions

WJR analyzed the clinical data and wrote the manuscript. YHL designed the study and reviewed the manuscript. HK, JHM, HJJ, HRK, HJE, JYL, YJL, KP, MJK and SHK performed clinical studies and analyzed their clinical data. All authors read and approved the final manuscript.

Acknowledgements

This study was supported by grants from the Korea Healthcare Technology R&D Project of the Ministry for Health & Welfare Affairs of the Republic of Korea (A101712).

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

Please contact author for data requests.

Ethics approval and consent to participate

This study was approved by the Institutional Review Board of Hanyang University Hospital (201103002).

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

(1)
Department of Pediatrics, Hanyang University Medical Center, 222-1, Wangsimni-ro, Seongdong-gu, Seoul, 04763, South Korea
(2)
Blood and Marrow Transplantation Center, Hanyang University Medical Center, Seoul, South Korea
(3)
Cell Therapy Center, Hanyang University Medical Center, Seoul, South Korea
(4)
Department of Radiology, Hanyang University Medical Center, Seoul, South Korea
(5)
Department of Nuclear Medicine, Hanyang University Medical Center, Seoul, South Korea
(6)
Department of Rehabilitation Medicine, Hanyang University Medical Center, Seoul, South Korea

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