Abstract
The discovery of microRNAs (miRNAs) as novel regulators of gene expression has led to a marked change in how gene regulation is viewed, with important implications for development and disease. MiRNAs are endogenous, small, noncoding RNAs that largely repress their target mRNAs post-transcriptionally. The regulation of gene expression by miRNAs represents an evolutionarily conserved mechanism that is broadly applicable to most biological processes. Recent studies have begun to define the role of miRNAs in different cell lineages during kidney development, and to implicate specific miRNAs in developmental and pathophysiological processes in the kidney. This review will focus on novel insights into the role(s) of miRNAs in kidney development, and discuss the implications for pediatric renal disease.
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Introduction
The initial discovery that a small regulatory RNA could specifically silence the function of a gene in the nematode, Caenorhabditis elegans [1], has subsequently led to revolutionary changes in how we view gene regulation, advances in the ‘toolbox’ of scientists for gene silencing, and perhaps more importantly, potential novel therapeutic approaches for disease. microRNAs (miRNAs) comprise a class of endogenous, non-coding RNA molecules that generally cause their mRNA targets to undergo post-transcriptional repression. Over the past two decades, it has become clear that miRNA-mediated regulation of gene expression represents an evolutionarily conserved mechanism that is broadly applicable to most biological processes. There are over 21,000 miRNAs reported in 168 species to date, from plants to animals (miRBase version 18 [2]), and it has been estimated that up to ½ of all transcripts are regulated by miRNAs [3]. There are several recent, comprehensive reviews of miRNAs in the kidney [4–10]. This review will focus on novel insights into the role(s) of miRNAs in kidney development, and discuss the implications for pediatric renal disease.
miRNA biogenesis and function
Much like other genes, miRNA genes are transcribed by RNA polymerase II into primary miRNA transcripts (Fig. 1) [11]. This primary transcript is processed by the Microprocessor complex in the nucleus to produce stem-loop precursor miRNAs, which are then exported into the cytoplasm via Exportin-5. These precursor miRNAs are subsequently cleaved by Dicer to form mature miRNAs. The mature miRNA recognizes and binds to its respective target mRNAs, recruiting the RNA-induced silencing complex (RISC) (Fig. 1) [11]. Following the recruitment of RISC, miRNAs decrease expression of their mRNA targets through translational repression, deadenylation and/or enhanced mRNA decay [12]. Thus, miRNAs generally function as negative regulators of gene expression.
How do miRNAs recognize their targets? With a few exceptions, the key feature of miRNA target recognition is mRNA sequence complementarity to the 8-nucleotide (nt) ‘seed’ miRNA sequence, and most miRNA target sites occur in the 3’-untranslated region [13]. A number of bioinformatic algorithms have been developed based on this observation, in addition to incorporating other sequence features that are thought to confer increased specificity to miRNA target prediction [14]. Based on the experimental datasets from which these algorithms were derived, it has been suggested that mammalian miRNAs have on average several hundred mRNA targets per conserved miRNA family [15].
The production of miRNAs is regulated at multiple levels. For example, transcription of miRNA genes is largely transcription factor-dependent, and recent studies have systematically identified candidate miRNA promoters using chromatin immunoprecipitation (ChIP)-sequencing for chromatin marks specific to transcriptional initiation sites [16]. These experiments are revealing insights into how miRNAs and transcription factors are linked in global gene regulatory networks [17]. Some miRNAs are transcribed in clusters from a single primary miRNA transcript, in which the individual miRNAs are processed from a common precursor transcript, allowing for coordinated expression and the potential for cooperative function. A large number of miRNAs are also subject to post-transcriptional regulation, at the level of processing of primary miRNA transcripts and precursor miRNAs, as well as RNA editing [18–21]. Finally, although most miRNAs repress their respective target mRNAs, some miRNAs have been shown to activate targets depending on the cellular context [22].
There are distinct features associated with miRNA-mediated gene regulation [17]. miRNA knockdown studies show that the degree of miRNA repression is relatively modest for individual proteins, and that a miRNA can modulate the expression of hundreds to thousands of proteins [23, 24]. Although the effect of individual miRNA-mRNA target interactions may be modest, since many miRNAs target multiple members of a signaling pathway, the combinatorial effect is likely to be more robust [25]. Another distinguishing feature is the potential speed of miRNA repression, since miRNAs act following transcription [26]. Furthermore, miRNAs can distribute to different subcellular compartments, based on their association with the site of protein translation [27, 28]. Broadly speaking, miRNAs are thought to “fine-tune” existing transcriptional programs, and it may thus be more informative to describe miRNA activity in the context of modulating signaling pathways at multiple levels, as part of larger regulatory networks [25].
miRNAs in early kidney development
The concept that miRNAs are crucial regulators of developmental processes has its roots in the original description of the first miRNA, lin-4, in controlling developmental timing in C. elegans [1]. Since then, it has become clear that miRNAs are necessary for the development of multiple tissues, and are critical in the regulation of immunity, oncogenesis and cardiac disease. Interestingly, miRNAs are implicated as key regulators of embryonic stem cells, and specific miRNA families have recently been shown to have the ability to reprogram somatic cells into induced pluripotent cells [29, 30]. Given their importance in numerous developmental processes, it is not surprising that miRNAs play an important role during kidney development.
To briefly review, kidney development begins when a small group of mesodermal cells are induced to form nephron progenitors by the ureteric bud (reviewed in [31]). In response to signals from the ureteric bud and surrounding stromal cells, nephron progenitors are capable of undergoing both self-renewal and differentiation into the multiple cell types of the mature nephron. The ureteric bud branches in response to reciprocal signals from nephron progenitors, and goes on to form the collecting system of the kidneys. This process continues in an iterative fashion during kidney development, such that new nephrons are continually being induced in the nephrogenic zone just below the renal capsule. Thus, there is a corticomedullary gradient of differentiating nephrons, with the most immature cells present in the renal cortex.
Given the growing interest in miRNAs, large-scale efforts to profile and document gene expression during embryonic kidney development have expanded to include small RNA expression [32–34]. Using several different technological platforms (miRNA microarrays, small RNA cloning or deep RNA-sequencing), these studies have now made available a number of datasets that describe miRNA expression in the developing kidney. Recently, the observation that modified locked nucleic acid nucleotides can be used to detect miRNAs by in situ hybridization has led to further information regarding the cellular localization of specific miRNAs [33, 35, 36]. Together these studies provide an emerging, though still incomplete, picture of the spatial and temporal expression patterns of miRNAs during kidney development.
miRNAs in kidney progenitor cells
The first functional studies addressing roles for miRNAs in specific cell lineages in the kidney have used a conditional approach to knock down Dicer, which is required for the production of mature miRNAs (Fig. 1) [11]. Conditional Dicer models have been reported for nephron progenitors, ureteric epithelium, podocytes, proximal tubules and juxtaglomerular cells [35, 37–42]. The loss of miRNAs in nephron progenitors and their cellular descendants results in a premature depletion of progenitors notable by embryonic day 15 in the mouse, and a marked decrease in nephron number [35, 39]. This appears to be mediated by increased apoptosis in the progenitor population, and up-regulation of the pro-apoptotic protein Bim in the absence of miRNAs [35]. Although disruption of Dicer activity did not grossly affect nephron patterning, there is evidence to suggest that apoptosis is also elevated in proximal segments of the developing nephron [35, 39]. These findings raise the intriguing question of whether miRNAs serve to regulate congenital nephron endowment by modulating the balance between apoptosis and survival in nephron progenitors.
miRNAs in the ureteric bud lineage
Loss of miRNAs in the ureteric lineage results in hypoplastic, cystic kidneys with varying degrees of hydronephrosis, depending on the efficiency of conditional deletion of Dicer [39, 43]. The hypoplasia is thought to be secondary to early termination of branching morphogenesis, and is associated with decreased expression of Wnt11 and c-ret, two critical regulators of normal ureteric bud branching [39]. The appearance of cysts in the ureteric epithelium is evident by embryonic day 15, and is accompanied by ciliary changes, increased proliferation, and elevated apoptosis [39].
miRNA function in the mature nephron
Podocyte-specific loss of Dicer activity results in marked proteinuria by two weeks of age, followed by rapid progression to renal failure in mice [37, 38, 41]. The severe proteinuria is coupled with histological and ultrastructural abnormalities including crescent formation, glomerulosclerosis, foot process effacement, tubular simplification, and atrophy [37, 38, 41]. While the initial specification of podocytes occurs normally in these mice, the maintenance of podocyte structure requires miRNAs. The mutant podocytes demonstrate decreased expression of several cytoskeletal proteins, including synaptopodin, ezrin and podocalyxin, as well as the slit-diaphragm associated proteins, nephrin and podocin [37, 38, 41]. Unlike in nephron progenitors or the ureteric epithelium, there are minimal changes in apoptosis or proliferation in the mutant podocytes. In initial attempts to identify miRNAs that are responsible for the disruption of podocyte structure, bioinformatic analysis of upregulated mRNA transcripts in mutant glomeruli suggested the miR-30 family members as possible candidates [41]. Interestingly, the inducible deletion of another miRNA processing enzyme Drosha in podocytes in 2 to 3-month-old mice also results in a similar phenotype, demonstrating an ongoing need for miRNA function in the structure and function of mature podocytes [44].
Mice with a Dicer deletion in renin-secreting cells in the juxtaglomerular apparatus demonstrate loss of juxtaglomerular cells, decreased circulating renin, reduced blood pressure, striped interstitial fibrosis and vascular abnormalities [40]. Within the areas of fibrotic bands, there are vascular alterations ranging from near replacement of arterioles by interstitial cells to distorted arterioles with fibroplasia. In the absence of increased cell death, the decrease in juxtaglomerular cells is thought to result from alterations in the determination of the renin lineage. Recent work implicates two specific miRNAs, miR-330, and miR-125b-5p, in modulating the renin lineage [45].
Unlike the other conditional Dicer models in the kidney, there is no developmental or functional renal defect seen in mice with disruption of Dicer in the proximal tubule [42]. In fact, these mice possess a resistance to ischemia-reperfusion injury, with decreased histological evidence of tubular injury, smaller increases in serum creatinine, and decreased apoptosis. This report further described miRNAs that were up- or down-regulated in response to renal ischemia-perfusion injury, as a means to begin evaluating the mechanisms by which miRNAs might be mediating this response to injury.
miRNAs and kidney disease
Over the past decade, there has been a rapid expansion in the number of studies addressing potential role(s) for miRNAs in kidney disease. This work can broadly be divided into two main areas: the analysis of differential miRNA expression in renal disease, and the study of specific miRNAs that regulate pathologic processes (see recent reviews for a systematic description [4, 5, 8, 10]). These studies implicate transforming growth factor-β regulation of miRNA expression in diabetic nephropathy [46–49], p53 induction of miR-34a in ischemic acute kidney injury [50], miR-15a regulation of the cell cycle regulator Cdc25A in polycystic kidney disease [51], and the oncomir miR-17 ~ 92 cluster in renal cell carcinoma and Wilms’ tumor [52–54]. Differential miRNA profiles have been described in rodent disease models as well as from patient samples (urine, blood, and renal biopsies) for diseases including acute kidney injury [42, 55, 56], polycystic kidney disease [57, 58], acute rejection [59–61], lupus nephritis [62] and IgA nephropathy [63].
A recent illustrative example is that of miR-21 and renal fibrosis. miR-21 is up-regulated in response to transforming growth factor-β signaling, and has been functionally implicated in the fibrosis seen in mouse models of cardiac hypertrophy and idiopathic pulmonary fibrosis [64, 65]. Several recent studies have gone on to demonstrate decreased renal fibrosis following unilateral ureteral obstruction after miR-21 knockdown in wild-type mice or miR-21 knockout mice [66–68].
Novel therapeutic applications that take advantage of miRNA-mediated pathophysiological processes are becoming more feasible. One possibility is the use of miRNAs as novel biomarkers, particularly given their marked stability. One recent study suggests that their average half-life may be as long as ~5 days [69]. Furthermore, miRNAs are transported in the plasma [70] and can be isolated from urine [71, 72], increasing their potential utility.
There are several experimental approaches currently in development to modulate miRNA activity in vivo. Modified oligonucleotides, such as antagomirs or locked nucleic acid oligonucleotides, have successfully been used to target endogenous miRNAs in mammals, and can target miRNAs in the kidney [10, 66, 73]. Other approaches include the use of “miRNA sponges” to sequester endogenous miRNAs, or the introduction of oligonucleotide “target maskers” that protect miRNA targets against miRNA-mediated repression [10, 74].
Challenges in miRNA research
What are the challenges moving forward in understanding the roles of miRNAs in kidney development? While the Dicer models have provided crucial insights into functional requirements for miRNAs in the kidney, the challenge now is the identification of specific miRNAs that are responsible, at least in part, for the observed phenotypes. One example is the description of the role of the miR-30 family in regulating pronephric development in Xenopus [75]. Knockdown of miR-30a-5p was sufficient to phenocopy almost all of the pronephric defects that are caused by global loss of miRNAs using Dicer or Dgcr8 morpholino knockdown, suggesting that the miR-30 family is essential in normal pronephric development. Moreover, this study went on to demonstrate that a transcription factor known to be essential for kidney development in the mouse and frog, Xlim1/Lhx1, is a target of miR-30.
From a scientific standpoint, defining biologically relevant miRNA-mRNA target interactions continues to be a difficult task. The bioinformatic target prediction algorithms are hampered by a high false positive prediction rate, and can fail to predict the most biologically important miRNA targets [76]. Nevertheless, they remain an important tool, and continue to be the basis behind which most miRNA-mRNA target interactions have been verified experimentally. A more recent approach involves high-throughput RNA sequencing of RISC-bound RNA fragments, which allows for the identification of RISC-associated miRNAs and their target mRNAs [77–79]. These newer experimental approaches to miRNA target identification offer the possibility of more robust target predictions, and the ability to better refine bioinformatic algorithms that describe miRNA-mRNA target interactions.
Despite the rapid growth of information regarding miRNAs, there remains much to be learned about miRNA-mediated regulation of normal and abnormal kidney function. As we move towards defining the activity of specific miRNAs and their target(s) of interest, this offers the possibility of innovative approaches to the diagnosis and therapy of renal diseases. Many challenges remain, from the development of safe and effective drug delivery methods for small RNAs, to understanding the role of miRNAs within larger gene regulatory networks to minimizing off-target effects. However, it is encouraging to see how much progress has been made since these small RNA molecules were first described two decades ago.
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Acknowledgments
Dr. Ho’s laboratory is supported by the National Institutes for Diabetes, Digestive and Kidney Diseases (NIDDK) grant 1K99DK087922, the Pennsylvania Department of Health, Children’s Hospital of Pittsburgh of UPMC Research Advisory Committee and a Norman S. Coplon Extramural Grant. Dr. Kreidberg’s laboratory is supported by NIDDK grants R01DK087794 and R01DK091295, and the Harvard Stem Cell Institute.
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Ho, J., Kreidberg, J.A. MicroRNAs in renal development. Pediatr Nephrol 28, 219–225 (2013). https://doi.org/10.1007/s00467-012-2204-y
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DOI: https://doi.org/10.1007/s00467-012-2204-y