Secretome of Mesenchymal Stem Cells and Its Potential Protective Effects on Brain Pathologies
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Molecular Neurobiology (2019) 56:6902–6927 https://doi.org/10.1007/s12035-019-1570-x Secretome of Mesenchymal Stem Cells and Its Potential Protective Effects on Brain Pathologies Eliana Baez-Jurado1 & Oscar Hidalgo-Lanussa1 & Biviana Barrera-Bailón1 & Amirhossein Sahebkar2,3,4 & Ghulam Md Ashraf5 & Valentina Echeverria6,7 & George E. Barreto1 Received: 25 October 2018 /Accepted: 18 March 2019 /Published online: 2 April 2019 # Springer Science+Business Media, LLC, part of Springer Nature 2019 Abstract Previous studies have indicated that mesenchymal stem cells (MSCs) have a fundamental role in the repair and regeneration of damaged tissues. There is strong evidence showing that much of the beneficial effects of these cells are due to the secretion of bioactive molecules—besides microRNAs, hormones, and neurotrophins—with anti-inflammatory, immunoregulatory, angio- genic, and trophic effects. These factors have been reported by many studies to possess protective effects on the nervous tissue. Although the beneficial effects of the secretory factors of MSCs have been suggested for various neurological diseases, their actions on astrocytic cells are not well understood. Hence, it is important to recognize the specific effects of MSCs derived from adipose tissue, in addition to the differences presented by the secretome, depending on the source and methods of analysis. In this paper, the different sources of MSCs and their main characteristics are described, as well as the most significant advances in regeneration and protection provided by the secretome of MSCs. Also, we discuss the possible neuroprotective mechanisms of action of the MSC-derived biomolecules, with special emphasis on the effect of MSCs derived from adipose tissue and their impact on glial cells and brain pathologies. Keywords Mesenchymal stem cells . Paracrine factors . Pathologies . Therapeutics . Secretome . Brain Abbreviations CNS Central nervous system ASCs Adult stem cells CM-A-MSC Conditioned medium of mesenchymal AFSCs Amniotic fluid stem cells cells derived from adipose tissue BM-MSC Conditioned medium of mesenchymal stem cells derived from bone marrow CM-MSCs Conditioned medium of mesenchymal stem cells * George E. Barreto [email protected]; [email protected] DPSCs Dental plug stem cells ESCs Embryonic stem cells 1 Departamento de Nutrición y Bioquímica, Facultad de Ciencias, EpSCs Epithelial stem cells Pontificia Universidad Javeriana, Bogotá, DC, Colombia FSC Fetal stem cells 2 Neurogenic Inflammation Research Center, Mashhad University of HSC Hematopoietic stem cells Medical Sciences, Mashhad, Iran HSC Hepatic stem cells 3 Biotechnology Research Center, Pharmaceutical Technology HI Hypoxic-ischemic Institute, Mashhad University of Medical Sciences, Mashhad, Iran IPSC Induced pluripotent stem cells 4 School of Pharmacy, Mashhad University of Medical Sciences, A-MSC Mesenchymal cells derived from Mashhad, Iran adipose tissue 5 King Fahd Medical Research Center, King Abdulaziz University, MSCs Mesenchymal stem cells Jeddah, Saudi Arabia BM-MSC Mesenchymal stem cells derived 6 Facultad de Ciencias de la Salud, Universidad San Sebastian, Lientur from bone marrow 1457, 4080871 Concepción, Chile hUCB-MSC Mesenchymal stem cells of the human 7 Research & Development Service, Bay Pines VAHealthcare System, umbilical cord Bay Pines, FL 33744, USA Mol Neurobiol (2019) 56:6902–6927 6903 L-MSC Mesenchymal stromal cells derived in tissue repair and wound closure [16, 17]. Furthermore, it from the limbus has been found that VEGF, FGF, CCL2 (MCP1), the hepato- NSC Neural stem cells cyte growth factor (HGF), and IGF-1 have protective func- PSC Pluripotent stem cells tions in different tissues. Specifically, the PDGF-BB, bFGF, ROS Oxygen species endothelial growth factor (EGF) [17, 18], brain-derived neu- RNS Reactive nitrogen species rotrophic factor (BDNF), nerve growth factor (NGF) [19–21], SCI Spinal cord injury IGF-1 [21], and glial-derived nerve growth factor (GDNF) TBI Traumatic brain injury [19] have been reported to exert protective effect specifically UCB Umbilical cord blood on the brain tissue [22, 23]. In this review, we present a general UCPVC Umbilical cord stem cells and integrated overview of current knowledge about MSCs, UCPVC Umbilical cord stem cells the mechanism of action of their bioactive molecules and/or WJSC Wharton gelatin stem cells factors, and the recent progress in the investigation of their potential regenerative and protective action on glial cells such as astrocytes, as well as on different pathologies of the Introduction CNS. Recent studies have demonstrated the ability of mesenchymal stem cells (MSCs) to differentiate into a variety of functional Diversity of MSC Sources: Greater tissues, which are often affected by different diseases and Opportunity in Cell Therapy injuries [1–3]. For this reason, MSCs have been considered as one of the most promising agents in regenerative therapy MSCs can be found in a variety of tissues in the body, and they for tissue replacement and repair. Efforts have been focused are the source of a natural response to traumatic onset and cell on studying and applying regenerative therapy with MSC for tissue regeneration. It is important to separate the embryonic some diseases and respiratory pathologies, hematopoietic dis- stem cells (ESCs) from fetal stem cells (FSCs) and adult stem eases, and diabetes [4, 5] as well as other pathologies that cells (ASCs), since they differ in the degree of cellular fate drastically affect the central nervous system (CNS), such as [24]. traumatic injury, stroke, and spinal cord injury, among others ESCs are pluripotent, while FSCs and ASCs are [6, 7]. multipotent. The pluripotent state implies that it can give rise This growing interest is based on the acquisition of knowl- to more than one type of differentiated cell line and edge to understand the signals that govern the therapeutic and multipotent cells have a restrictive potency due to the acquired regenerative function of stem cells, especially in tissues with- cell's ability to form a type of tissue depending on the germ out regenerative capacity [8]. The brain tissue is one of the layer from which they originated [25, 26]. ESCs come from tissues that have this characteristic because it cannot regener- lineages of blast cells and gastric (blastocyst, trophectoderm, ate its nerve cells; in this case, many studies have utilized and internal cell mass) [27–30]. On the other hand, it was MSCs to protect and improve neuronal function [9], but ig- initially thought that all the cell lineages of the ASCs came noring other cells with important functions such as astrocytes. from the mesoderm embryonic tissue [27], but later on, it was Additionally, the mechanism by which MSCs exert their effect observed that ASC cells differentiated into functional cells is still not clear. It is even believed that the protective and that originated from the ectoderm and the endoderm [31]. beneficial effects of MSCs are due to the presence of biomol- This suggests that ASCs originally formed from the three ecules and soluble factors that these cells produce and release embryonic germ layers (mesoderm, ectoderm, and endo- into their extracellular environment [10–12]. derm). ASCs have been found in almost all tissues, regardless Previous studies of the secretome of MSCs have revealed a the tissue has a great regenerative capacity or not, denoting the diversity of biomolecules with broad and essential functions important role as progenitors [8]. that may have important therapeutic implications in the clinic. In adult individuals, the stem cells are located in niches in These biomolecules are anti-apoptotic factors, growth factors the perivascular zone of all organs which are microenviron- such as vascular endothelial growth factor (VEGF), β fibro- ments that provide protection for different stimuli, like differ- blast growth factor (FGF), platelet-derived growth factor entiation and apoptosis, in addition to allowing them to main- (PDGF) and insulin-like growth factor (IGF-1), sphingosine- tain a balance between self-renewal and differentiation 1-phosphate (S1P) [13], anti-inflammatory factors such as tu- [32–35]. Even if all niches share the same expression of key mor necrosis factor β1 (TGF-β1), interleukin (IL-10) [14], molecules in different tissues, each niche has a molecular and antimicrobial chemokines (the chemokine (C-X-C motif) identity associated with the tissue to which it is related. They ligand (CXCL)10, CXCL8, CXCL1, CXCL6, chemokine (C- even share characteristics of pericytes in terms of phenotype, C motif) ligand (CCL)20, and CCL5) [15], all being involved marker expression, and differentiation capacity [32, 36]. This 6904 Mol Neurobiol (2019) 56:6902–6927 identity is mainly reflected in the presence of membrane re- have a greater commitment and their power varieties depend ceptors that are specific to each tissue for extracellular matrix on the location within the embryo. proteins and associated growth factors of the surrounding tis- Besides the controversy due to the ethics involved in work- sues [32, 33, 37]. The common molecules between niches can ing with human embryos [51, 52], the in vitro issue of low play diverse roles according to the embryonic origin and the embryo generation rate [53], and differentiation to obtain a specific functions of the specific tissues [33]. heterogeneous population [53], ESCs are currently being eval- According to Bieback et al. [38], MSCs comprise a diverse uated for several