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ORIGINAL ARTICLE
Year : 2016  |  Volume : 6  |  Issue : 3  |  Page : 119-126

Bone marrow hematopoietic stem cells behavior with or without growth factors in trauma hemorrhagic shock


1 Department of Emergency Medicine, Jai Prakash Narayan Apex Trauma Centre, All Institute of Medical Sciences, New Delhi, India
2 Department of Stem Cell Facility, All Institute of Medical Sciences, New Delhi, India
3 Department of Biostatistics, All Institute of Medical Sciences, New Delhi, India
4 Department of Biochemistry, All Institute of Medical Sciences, New Delhi, India
5 Department of Haematology, All Institute of Medical Sciences, New Delhi, India
6 Department of Emergency Medicine, University of Florida, Florida, USA

Date of Web Publication16-Sep-2016

Correspondence Address:
Sanjeev Bhoi
Department of Emergency Medicine, Jai Prakash Narayan Apex Trauma Centre, All India Institute of Medical Sciences, New Delhi - 110 022
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2229-5151.190654

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   Abstract 

Background: Hemorrhagic shock (HS) is the major leading cause of death after trauma. Up to 50% of early deaths are due to massive hemorrhage. Excessive release of pro-inflammatory cytokine and hypercatecholamine induces hematopoietic progenitor cells (HPCs) apoptosis, leading to multiorgan failure and death. However, still, result remains elusive for hematopoietic stem cells (HSCs) behavior in trauma HS (T/HS).
Objectives: Therefore, our aim was to evaluate thein vitro HSCs behavior with or without recombinant human erythropoietin (rhEPO), recombinant human granulocyte macrophage-colony-stimulating factor (rhGM-CSF), recombinant human interleukin-3 (rhIL-3) alone, and combination with rhEPO + rhGM-CSF + rhIL-3 (EG3) in T/HS patients.
Methodology: Bone marrow (BM) aspirates (n = 14) were collected from T/HS patients, those survived on day 3. BM cells were cultured for HPCs: Colony-forming unit-erythroid (CFU-E), burst-forming unit-erythroid (BFU-E), and colony-forming unit-granulocyte, monocyte/macrophage colonies growth. HPCs were counted with or without rhEPO, rhGM-CSF, rhIL-3 alone, and combination with EG3 in T/HS patients.
Results: BM HSCs growth significantly suppressed in T/HS when compared with control group (P < 0.05). In addition, CFU-E and BFU-E colony growth were increased with additional growth factor (AGF) (rhEPO, rhGM-CSF, and rhIL-3) as compared to baseline (without AGF) (P < 0.05).
Conclusion: Suppressed HPCs may be reactivated by addition of erythropoietin, GM-CSF, IL-3 alone and with combination in T/HS.

Keywords: Erythropoietin, granulocyte monocyte/macrophage-colony-stimulating factor, hematopoietic progenitor cells, interleukin-3 trauma-hemorrhagic shock


How to cite this article:
Kumar M, Bhoi S, Mohanty S, Kamal VK, Rao D N, Mishra P, Galwankar S. Bone marrow hematopoietic stem cells behavior with or without growth factors in trauma hemorrhagic shock. Int J Crit Illn Inj Sci 2016;6:119-26

How to cite this URL:
Kumar M, Bhoi S, Mohanty S, Kamal VK, Rao D N, Mishra P, Galwankar S. Bone marrow hematopoietic stem cells behavior with or without growth factors in trauma hemorrhagic shock. Int J Crit Illn Inj Sci [serial online] 2016 [cited 2019 Sep 16];6:119-26. Available from: http://www.ijciis.org/text.asp?2016/6/3/119/190654


   Introduction Top


Hemorrhagic shock (HS) is the leading cause of death in trauma. Mortality due to HS is approximately 50%.[1] Fluid, blood component, and control of hemorrhage have been the cornerstone of management. Previous studies have shown that resuscitation with fluids and blood products induces reperfusion ischemia due to the production of reactive oxygen species and activation of immune cells.[2] The elevated inflammatory cytokines contribute to the tissue damage. It also causes hematopoietic progenitor cells (HPCs: Colony-forming unit-erythroid [CFU-E], burst-forming unit-erythroid [BFU-E], colony-forming unit-granulocyte, monocyte/macrophage [CFU-GM]) apoptosis. It leads to multiorgan failure (MOF), following severe injuries and HS in human and animal models.[3],[4]

HPCs apoptosis is a multifactorial process. Elevated levels of pro-inflammatory cytokine milieu and circulating catecholamine change the behavior of bone marrow (BM) microenvironment in severe trauma patients.[5] Impaired HPCs are clinically associated with persistent anemia and are susceptible to infection, sepsis, and MOF.[3],[4]

EPO receptors are found on early BFU-E and late erythroid progenitor cells (EPCs) CFU-E. It helps proliferation and differentiation of EPC and nonhematopoietic tissue including central nervous system, endothelium, cardiac myocytes, and kidney.[1] Erythropoietin (EPO) has anti-apoptosis, neuroprotective, anti-inflammatory, and angiogenesis properties. Animal study demonstrated protection of renal function, liver and neuromuscular injury in pretreatment group (intravenous EPO 3 days before induction of HS) when compared pretreatment with placebo (intravenous phosphate buffer saline [PBS] 3 days before induction of HS). EPO accelerated healing process after tibiofibular fractures in humans.[1] Livingston et al. studied behavior of peripheral and BM HPCs growth at various time intervals. Suppressed HPCs growths were observed without reactivation.[4]

The effect of additional growth factors (AGFs), such as EPO, GM-CSF, and interleukin-3 (IL-3) alone and conjugation with EG3 (recombinant human erythropoietin [rhEPO] + recombinant human GM-CSF [rhGM-CSF] + recombinant human IL-3 [rhIL-3]) on HPCs growth, has been poorly understood in patients with trauma HS (T/HS).[1] We hypothesized that in vitro BM function may be reactivated with AGF. Therefore, our aim was to study in vitro colony growth of BM HPCs with or without AGFs in patients with T/HS presenting emergency department (ED) of a level 1 trauma center.


   Methodology Top


Study subjects

Trauma patients of either sex, age group >18 and <60 years, and systolic blood ≤90 mmHg presenting within 8 h of injury to the ED of trauma center were recruited in the study. Patients with more than 8 h of injury, death within 3 days of admission, and who had received fluid or blood before presentation to ED were excluded from the study. Patients with preexisting hematologic diseases, anemia, active HIV infection, and renal and liver failures were excluded. Informed consent was obtained from each donor according to the guidelines of the Institutional Ethical Committee (approved Reference number IEC/NP-278/2010) of All India Institute of Medical Sciences, New Delhi - 110 029, India.

Sample collection

Two milliliters BM samples were obtained from patients. Details of the patients are shown in [Figure 1]. BM aspirates were obtained from the iliac crest/sternum and placed into preservative-free heparin. Samples were obtained from the survivors on day 3, admitted in Intensive Care Unit (ICU) or ward. The timing of sampling was on day 3. Senior residents performed BM aspiration. Informed consent was obtained from patients or patients' relatives, those who fulfilled the inclusion criteria before the procedure. Samples were collected after filling the patient information sheet and patient information consent form (PICF) [Annexure 1] and [Annexure 2] [Additional file 1].
Figure 1: Recruitment of trauma-hemorrhagic shock patients. BM: Bone marrow, ISS: Injury severity score, SI: Shock index, APACHE II: Acute Physiology of Chronic Health Evaluation II, CFU-E: colony-forming unit-erythroid, CFU-GM: Colony-forming unit-granulocyte, monocyte/macrophage, BFU-E: Burst-forming unit-serythroid

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Patient management and treatment

All patients were treated with as per the Advance Trauma Life Support guideline. Shock index (SI), Acute Physiology of Chronic Health Evaluation II (APACHE II), and injury severity score (ISS) were calculated.

Definition

Shock index

The SI is defined as heart rate divided by systolic blood pressure, with a normal range of 0.5–0.7 in healthy adults. It is helpful to grade the severity of hemodynamic derangement after admission.[6],[7] SI was recorded once on arrival in the ED.

Acute Physiology of Chronic Health Evaluation II

APACHE II method is used for predicting hospital mortality among critically ill patients. It was noted within 24 h of admission in an ICU. Integer score from 0 to 71 was computed based on several measurements. Higher scores correspond to severe illness and higher risk of death.[8]

Injury severity score

The ISS is an anatomical scoring system that provides an overall score for patients with multiple injuries. Each injury was assigned an Abbreviated Injury Scale (AIS) score and allocated to one of six body regions (head, face, chest, abdomen, extremities including pelvis, and external injury). The highest AIS score in each body region was used. The three most severely injured body regions have their score squared and added together to produce the ISS score.[9]

Control group

We needed a normal marrow as a control. It would be unethical to ask normal individuals to donate marrow. Hence, it was decided to use patients whose marrow function is normal as a control, but coming for BM examination due to any reason. Patients with ITP have normal marrow function. However, increased peripheral destruction of platelets usually occurs in the spleen. The BM is done to demonstrate normal function as diagnostic criteria for ITP. BM sample was placed into preservative-free heparin. Samples were stored at 4°C before performing HPCs culture. Details of the control group are shown in [Figure 2].
Figure 2: Recruitment of control group. BM: Bone marrow, CFU-E: colony-forming unit-erythroid, CFU-GM: Colony-forming unit-granulocyte, monocyte/macrophage, BFU-E: Burst-forming unit-erythroid

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Hematopoietic progenitor cell cultures with or without additional growth factors

BM mononuclear cells (BMMNCs) were isolated from collected BM sample using Ficoll-Paque PLUS (M/s GE Healthcare Bio-Sciences AB, Uppsala, Sweden) density gradient centrifugation. BMMNCs were diluted with PBS in ratio of 1:4 and layered on Ficoll-Paque PLUS (2:1) and centrifuged at 1800 rpm × 30 min with room temp. Resultant buffy layer was collected from the interface and washed thrice with PBS to avoid the contamination of undesirable cells. The BMMNCs were pellet down at 1800 rpm × 10 min. Finally, the cells were resuspended in 1 ml IMDM + 2% FBS and MethoCult (M/s Stem Cell Technologies, Canada) and mixed thoroughly and cells were counted by hemocytometer. BMMNCs (2 × 105) were plated in duplicate in Methylcellulose media (M/s Stem Cell Technologies, Canada) with or without AGFs (rhEPO: 2.0 4.0 and 6.0 U/ml, rhIL-3: 3 U/ml, rhGM-CSF: 6 U/ml) (all from M/s. Peprotech, USA) alone and conjugation with EG3 (EPO [1 U/ml] + GM-CSF [3 U/ml] + IL-3 [1.5 U/ml]). Cultures were incubated at 37°C in 5% CO2. CFU-E colonies were counted at day 7; CFU-GM and BFU-E colonies were counted at day 14.

Morphological characteristics of colony-forming unit-erythroid, burst-forming unit-erythroid and colony-forming unit-granulocyte, monocyte/macrophage colonies

CFU-E, BFU-E, and CFU-GM were identified in a colony formation assay by the specific morphology of the cells.

CFU-E produces 8–200 erythroblasts in 1–2 clusters. Colonies are weakly or nonhemoglobinized [Figure 3]a. BFU-E produces three or more clusters. Colonies are usually large, dense, and hemoglobinized [Figure 3]c. CFU-GM produces a colony containing at least 40 granulocytes (CFU-G), macrophages (CFU-M), or cells of both lineages (CFU-GM) [Figure 3]b.[10],[11]
Figure 3: (a) Colony-forming unit-erythroid colony (day 7), (×10) (b) colony-forming unit-granulocyte, monocyte/macrophage colony (day 14), (×10) (c) burst-forming unit-erythroid colony (day 14) (×10)

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Statistical analysis

Data analysis

Categorical and continuous data were expressed in frequency (%) and mean ± SD/median (minimum, maximum). The associations between two categorical variables were seen using Chi-square/Fisher's exact test. For nonnormally distributed data, Mann–Whitney U-test was done to test the differences between two independent groups. Friedman test followed by post hoc analysis was used to detect differences in treatments for more than two groups. P <0.05 was considered statistically significant. All the statistical analyses were done using statistical software Stata 12.1, StataCorp LP, 4905 Lakeway Drive College Station. Taxas 77845, USA.


   Results Top


Study subjects

We recruited seventy patients with T/HS, of which 58 patients were excluded. Patients with coagulation defect (32),[12] death before day 3 (24), and contaminated samples (2) were excluded. BM samples were collected from 14 patients. Age group was between 18 and 60 years. Twelve males and two females in study group and 13 males and 13 females in control group were recruited for the study. SI, APACHE II, and ISS scores were recorded. The patient profile is depicted in [Table 1]. Details of the patients and control group are shown in [Figure 1] and [Figure 2].
Table 1: Patient characteristics

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Hematopoietic progenitor cell growth

BM CFU-E, BFU-E, and CFU-GM colony growth decreased in T/HS when compared with control group (CFU-E: 27 vs. 71, P < 0.05, BFU-E: 11 vs. 88, P < 0.01, CFU-GM: 5 vs. 34, P < 0.05) [Table 2].
Table 2: Bone marrow hematopoietic progenitor's cells (control vs. trauma-hemorrhagic shock)

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Hematopoietic progenitor growth with or without additional growth factor

CFU-E and BFU-E colony increased when added with AGF at different doses (rhEPO: 2.0, 4.0, 6.0 U/ml, rhIL-3: 3 U/ml, rhGM-CSF 6.0 U/ml) when compared with baseline control (without AGF), P < 0.05. CFU-E and BFU-E colony growth increased with 2.0 U/ml rhEPO (CFU-E: 64 vs. 27, P = 0.03, BFU-E: 17 vs. 11, P < 0.01) and with 3 U/ml rhIL-3 (CFU-E: 47 vs. 27, P < 0.01, BFU-E: 20 vs. 11, P < 0.01) [Table 3].
Table 3: Response of hematopoietic progenitor cells with additional growth factors

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In addition, we explored the additive effect of EG3 (EPO + GM-CSF + IL-3) on HPCs colony growth. We found CFU-E (121 vs. 27, P < 0.05) colonies increased when compared with baseline control (CFU-E: 121 vs. 27, P < 0.01) [Table 3].


   Discussion Top


The present study indicates altered HPCs growth within BM compartment. It showed suppression of HPCs growth (CFU-E: 27 vs. 71, BFU-E: 11 vs. 88, CFU-GM: 5 vs. 34) when compared with control group. Livingston et al. observed suppressed BM progenitor cell growth in severely injured patients when compared to normal volunteer (28 ± 31 vs. 247 ± 24).[4] [Table 4] compares the present study and Livingston et al. study for HPCs growth. Dysfunction of HPCs is a multifactorial process. HS induces elevated levels of inflammatory cytokines and circulating catecholamine which leads to HPCs apoptosis. BM dysfunction may lead to persistent anemia and risk of susceptibility to infection and sepsis.[4],[5],[13]
Table 4: Bone marrow hematopoietic progenitor cells behavior in trauma-hemorrhagic shock (present study) versus trauma without hemorrhagic shock (Livingston et al.)

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Hematopoietic stem cells (HSCs) are derived from mesoderm. Previous studies demonstrated that HSCs have regeneration capacities and committed to multipotent, oligopotent, and unipotent progenitors. HSCs self-renewal is thought to occur in the stem cell niche.[14] HPCs microenvironment is controlled by a complex interplay between intrinsic signals surrounded by BM microenvironment.[12],[15] Dysregulation of this balance can lead to BM dysfunction, which leads to hematopoietic and myeloproliferative disorder.[3] The present study reported impaired BM erythropoiesis in T/HS patients.

BM failure observed after trauma may be due to the lack of pro-regulatory cytokines within the BM microenvironment.[16] Moore et al. found decreased production of myeloid colony-stimulating factors by monocytes from severely injured patients.[16] Inhibitory cytokines for hematopoiesis such as transforming growth factor-beta 1[17] have been reported to be elevated following severe trauma,[18] and it is possible that the BM failure observed is due to an overexpression of negative hematopoietic regulators.[17],[18]

Erythropoietin induces erythropoiesis by promoting proliferation and differentiation of EPCs through the CFU-E. IL-3 and GM-CSF promote proliferation and differentiation of EPC.[19] There is a paucity of literature regarding the reactivation of BM dysfunction with AGFs (AGF, e.g. EPO, GM-CSF, and IL-3) alone and combination with EG3 following T/HS patients. However, we thought suppressed HPCs in T/HS may be reactivated by AGF alone and conjugation with EG3. In this study, we used three growth factors, rhEPO, rhGM-CSF, rhIL-3 alone and combination of EG3 for stimulation and differentiation of HSCs in the BM.

Previous studies demonstrated the potential role of growth factor (rhEPO, rhIL-3, rhGM-CSF) in proliferation and differentiation of HSCs in BM.[20] In addition, IL-3 alone and in conjunction with IL-6, EPO, and GM-CSF stimulate proliferation of all cells in the myeloid lineage (granulocytes, monocytes, and dendritic cells) in murine model.[20],[21] Wang et al. demonstrated that IL-3 and steel cell factor (SCF) have synergistic effect with EPO on the proliferation, differentiation, and apoptosis of EPCs in mice model. Furthermore, IL-3, EPO, and SCF were reported to act as anti-apoptotic, thereby inhibiting Bcl-2 family, such as Bcl-2 and Bcl-xl.[22]

The number of HPCs CFU-GM is increased by 18-fold and CFU-Mix increased by 5.3-fold with perfusion cultures with combination of SCF + IL-3 + IL-6 (S36).[23] McNiece et al. reported that GM-CSF, G-CSF, and IL-3 stimulated distinct populations of GM-colony-forming cells.[24] To the best of our knowledge, there are no data available with AGF and conjugation with EG3 on patients with T/HS. However, few studies have reported in vitro BM HPCs increased with various growth factors (IL-3, GM-CSF, EPO, SCF, and G-CSF) in nontrauma patients.[25],[26],[27],[28] The present study analyzed in vitro BM HPCs response to stimulation with AGF (EPO: 2 U/ml, IL-3: 3 U/ml) in T/HS patients. Previous in vitro studies reported synergistic interaction of hematopoietic growth factors.

In vivo animal studies demonstrated synergistic interactions with administration of various combinations such as GM-CSF, IL-3 with CSF-1, and GM-CSF with IL-3.[29],[30] The present study suggests that the combination of EG3 is synergistic for in vitro CFU-E colony growth in T/HS patients.

Our study has some limitations that should be acknowledged. There was no sequential sampling for HSCs growth during the course of illness injury. Several factors such as gender, sex steroids, and genetic polymorphisms may have influenced inflammatory cytokine levels, which could not be controlled due to the design of the study.[31],[32],[33],[34],[35] In this small sample of 12 patients, it is very difficult to determine which factors are the leading causes for BM failure. However, our results demonstrated that BM dysfunction may be reversible with AGF (rhEPO 2 U/ml, rhIL-3: 3 U/ml) alone and conjugation with EG3 in T/HS patients. The use of growth factors may help shorten the recovery of suppressed HPCs and reduced blood transfusion. Further studies with large sample sized clinical trial with growth factors in T/HS in animal model may provide further insight.


   Conclusion Top


Suppressed HPCs may be reactivated by addition of erythropoietin, GM-colony-stimulating factor, IL-3 alone and with combination in T/HS.

Financial support and sponsorship

This study was financially supported by Indian Council of Medical Research (ICMR).

Conflicts of interest

There are no conflicts of interest.

 
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    Figures

  [Figure 1], [Figure 2], [Figure 3]
 
 
    Tables

  [Table 1], [Table 2], [Table 3], [Table 4]


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