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The Roles of Small Gtpases in Osteoclast Biology Megan M yst ar S em ul : C c u s r u r e M n Weivoda and Oursler, Orthopedic Muscul Syst t & R Orthopedic & Muscular System: c e i s 2014, 3:3 d e e a p ISSN: 2161-0533r o c h h t r DOI: 10.4172/2161-0533.1000161 O Current Research Review Article Open Access The Roles of Small GTPases in Osteoclast Biology Megan M. Weivoda* and Merry Jo Oursler Endocrine Research Unit, Mayo Clinic, USA *Corresponding author: Megan M. Weivoda, Endocrine Research Unit, Mayo Clinic, 200 First Street NW, Rochester, MN 55905, USA, Tel: 507-293-3242; E-mail: [email protected] Received date: May 24, 2014, Accepted date: Jul 16, 2014, Published date: Jul 22, 2014 Copyright: © 2014 Weivoda MM, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Abstract The adult skeleton undergoes bone remodeling that consists of bone formation by osteoblasts and bone resorption by osteoclasts. When the amount of bone resorbed is greater than the amount of new bone formed, low bone mass results, putting individuals at increased risk for osteoporosis and osteoporotic bone fracture. Nitrogenous bisphosphonates (NBPs) are the most common first line treatment for conditions of low bone mass. NBPs reduce osteoclast bone resorption by impairing the post-translational modification of small GTPases. Small GTPases play crucial roles in the differentiation, function, and survival of osteoclasts. Understanding the roles of individual small GTPases in osteoclast biology may lead to more targeted therapies for the treatment of low bone mass. In this review, we discuss recent investigations into the in vivo effects of individual GTPase deletion in osteoclasts and the molecular roles for small GTPases in osteoclast biology. Keywords: Osteoclast; Small GTPase; Rho; Rac; Cdc42; Ras; Small GTPases Podosome; Ruffled border Small GTPases are molecular switches controlling signal transduction [10] and are therefore key regulators of cellular events, Introduction including cell division, cytoskeletal organization, and vesicular The adult skeleton undergoes bone remodeling that consists of transport [11]. In basal conditions, GTPases exist in the GDP-bound, bone resorption by osteoclasts and subsequent bone formation by inactive state. Guanine-nucleotide Exchange Factors (GEFs) facilitate osteoblasts. Bone resorption and formation are coupled in order to the release of GDP, allowing the GTPase to bind GTP. GTP-binding maintain skeletal mass [1]. Uncoupling of these processes with aging causes a conformational change in the GTPase, resulting in activation and in certain genetic and environmental conditions causes the and interaction with downstream effector proteins. Inactivation of amount of bone resorption to exceed bone formation, leading to low GTPase signaling is dependent on the hydrolysis of the bound GTP to bone mass and increased risk for osteoporosis and osteoporotic GDP. Small GTPases have low intrinsic ability to hydrolyze GTP. The fractures [2]. Currently, nitrogenous bisphosphonates (NBPs) are the hydrolysis of GTP is therefore catalyzed by GTPase-Activating first line treatment for osteoporosis. NBPs reduce bone resorption by Proteins (GAPs) that bind to the active GTPase [12]. The Ras inhibiting an enzyme required for the post-translational modification Superfamily of small GTPases can be divided into five subfamilies on of small GTPases in osteoclasts [3]. NBP-treated patient osteoclasts the basis of sequence homology: Ras, Rho, Rab, Arf, and Ran. Each show features of prolonged apoptosis and resorption markers are subfamily has associated GEFs and GAPs. Additionally, some small significantly decreased [4,5]. NBPs also reduce the rate of bone GTPase families have Guanine Dissociation Inhibitors (GDIs) that formation [6,7] and there is evidence that these drugs blunt the regulate the cytosol versus membrane localization of the GTPases anabolic effects of parathyroid hormone on the skeleton [8,9]. The through interactions with prenyl moieties on the small GTPases [13]. presence of osteoclasts has been shown to be critical to normal bone Membrane targeting of Ras, Rho, and Rab GTPases is dependent on formation, and it is thought that impaired osteoclast viability is C-terminal protein prenylation [11]. Prenylation is the post- responsible for reduced bone formation with NBP therapy. translational covalent addition of farnesyl or geranylgeranyl lipid In this review we highlight recent investigations into the in vivo moieties to CaaX or CxC motifs on proteins [14], and is catalyzed by effects of individual GTPase deletion in osteoclasts. Additionally, we the prenyl transferases farnesyl transferase, geranylgeranyl transferase discuss the molecular roles of small GTPases in regulating osteoclast (GGTase)-1 or GGTase-2, otherwise known as Rab GGTase differentiation, cytoskeletal organization, and vesicular transport. The (RabGGTase) [11,14]. Farnesyl pyrophosphate (FPP) and effectiveness of NBP therapy supports that understanding how small geranylgeranyl pyrophospate (GGPP), the substrates for farnesylation GTPases are modified and their mechanisms of action in regulation of and geranylgeranylation, respectively, are products of the isoprenoid osteoclast function may promote the development of more targeted biosynthesis pathway. By inhibiting enzymes within this pathway, cells therapies to suppress bone resorption while preserving the anabolic can be depleted of these and other isoprenoid metabolites, leading to effects of osteoclasts on osteoblasts. impaired protein prenylation. The significance of small GTPases in osteoclast biology came to light when it was discovered that the effect of NBPs to inhibit bone resorption occurred through impaired protein prenylation [15,16]. NBPs inhibit FPP synthase (FPPS) leading to the depletion of FPP and Orthopedic Muscul Syst Volume 3 • Issue 3 • 1000161 ISSN:2161-0533 OMCR, an open access journal Citation: Weivoda MM, Oursler MJ (2014) The Roles of Small GTPases in Osteoclast Biology. Orthopedic Muscul Syst 3: 161. doi: 10.4172/2161-0533.1000161 Page 2 of 7 GGPP, as well as other downstream isoprenoid metabolites. The were large and irregular, as well as abnormally juxtaposed to the bone depletion of these groups impairs the prenylation of GTPases, [22]. It is not entirely clear what led to the discrepancy in results preventing their membrane localization. Disrupted prenylation of between the study by Croke et al., and those by Itokowa et al., and GTPases results in inappropriate signaling, suppressing osteoclast Magalhaes et al. One possibility is the age of the animals analyzed. The differentiation and function and stimulating apoptosis [17]. animals were 8-9 weeks, 12 months, and 7 weeks of age in the studies by Itokowaet al. [20], Magalhaes et al. [21], and Croke et al. [22], In vivo effects of osteoclast small GTPase deletion respectively. Importantly, all three studies found that deletion of Rac1 and/or Rac2 led to an increased bone phenotype despite normal or Several total and osteoclast-specific small GTPase knockout (KO) increased osteoclast numbers, suggesting that Rac signaling is crucial mouse models have been analyzed for bone phenotypes. The results to the osteoclast resorptive function. Also, in contrast to the blunted from these studies have validated the notion that small GTPases, as anabolic effect of PTH with NBP-mediated global disruption of well as their GEFs and GAPs, are crucial to proper osteoclast GTPase signaling [9], deletion of Rac2 augments PTH-induced bone differentiation and function. formation [23], suggesting that specific targeting of Rac does not Cdc42, a member of the Rho family of small GTPases, was deleted prevent the positive effects of osteoclasts to promote bone formation. from the osteoclast lineage using the Cathepsin K (Ctsk) promoter to Rap1 is a member of the Ras family of small GTPases. Recently, Zou drive Cre recombinase (Cre) expression. The mice exhibited an et al., generated osteoclast specific Rap1 deletion mice, using the Ctsk osteopetrotic phenotype, with an increased ratio of bone volume to promoter Cre. Similar to KO of Rac1 and Rac2, Rap1 osteoclast KO total volume (BV/TV), trabecular number (TbN) and trabecular mice are osteopetrotic, with high osteoclast numbers, suggesting thickness (TbTh). Trabecular spacing (TbSp), osteoclast perimeter, impaired osteoclast function [24]. and serum markers of resorption were reduced. The authors showed that the mice exhibited an increase in apoptotic osteoclasts, suggesting The only published Rab family KO model investigated for a bone that Cdc42 plays a role in osteoclast survival. Consistent with this phenotype is the Rab3D KO model. Rab3D KO mice are osteopetrotic, phenotype, mice with deletion of Cdc42GAP, a Cdc42 regulatory with increased BV/TV, TbN, and TbTh, and decreased TbSp. protein, exhibited a decreased bone phenotype, with increased serum Although the number of osteoclasts was unchanged, the percent markers of resorption, and increased osteoclast area [18]. eroded surface was significantly decreased, suggesting that the high bone mass phenotype was due to impaired bone resorption [25]. Rac1 and Rac2 are members of the Rho family of small GTPases. Rac1 is widely expressed, while Rac2 is expressed primarily by the The results of these in vivo studies demonstrate that targeting the hematopoietic lineage [19]. The effect of Rac2 deletion on the
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