Smoking-Induced Oxidative Stress in Bone: The Effects on Bone Turnover

Júlia Benini Kohler1, Jader Joel Machado Junqueira1, Taysa Cristiane Moreira da Silva3, Marco Antonio Gonçalves Pontes Filho3,4, Iolanda De Fátima L C Tibério1, Fernanda Degobbi T Q S Lopes1, Alexandre Póvoa Barbosa1,2*

1Department of Medicine, Laboratory of Experimental Therapeutics (LIM-20), School of Medicine, University of Sao Paulo, Sao Paulo, Brazil

2Department of Orthopaedics, Hospital do Coração - SP Brazil

3Department of Rheumatology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil

4Departments of Orthopaedics and Rheumatology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil


Despite of clinical evidence of increased incidence of bone diseases amongst smokers as well as worsening recovery in orthopedic surgeries, it is still unclear which pathological mechanisms are induced by smoking and how these events impair bone turnover.

Animal models and in vitro studies have been used to better elucidate these questions and smoking-induced oxidative stress have been pointed as playing crucial role in the worsening of bone cells activities leading bone damage.

Oxidative stress is a physiological mechanism characterized by an imbalance between oxidants and antioxidants components. This imbalance leads cell damage and consequent release of inflammatory mediators, resulting in structural changes that impair the functionality of compromised organ.

In this review, we summarize findings from clinical, animal models and in vitro studies that have elucidated the importance of the oxidative stress induced by smoking in different bone cells activities, leading bone mineral and organic matrix structural changes.

Highlights

We present the newest findings in understanding the impact of smoking in bone matrix composition. Review the clinical and experimental evidence for smoking-induced oxidative stress potential roles in bone turnover. Descript future directions for research and clinical management.


Introduction

Smoking effects on bone: Epidemiological evidence

Cigarette smoking is recognized as an important risk factor for several diseases, such as chronic obstructive pulmonary disease, cancer, heart attack and vascular diseases1-4.

Smoking is associated with increased incidence of fractures5, osteoporosis, mainly in women6, and delayed consolidation under bone injury conditions7.

In clinical studies, smoking has been associated with decreases in bone volume and mineral density (BMD) by the enhancement of bone resorption. Moreover, these effects depend on the duration of smoking and body weight6,8,9.

As the volume of exposure to cigarettes increase (expressed by cigarettes per day or pack-years) higher will be the decline in BMD at multiple skeletal sites and bone mass10.

The impacts of smoking on bone may differ between men and women. Since there are few studies describing these differences, there was no consensus about the physiological mechanisms that leads these different responses6.

The deleterious effect of smoking has been mostly demonstrated in women with low levels of estrogen, and in these women it was observed a reduction in the response of hormonal replacement therapy11,12. The United States Department of Health and Human Services showed that smoking causes a decrease in BMD in menopausal women13, and this effect is progressive over the years in smokers compared with nonsmokers14.

Although it is well established the importance of second-hand smoking in the progression of many diseases and health conditions, including cancer15, cardiovascular diseases16 and respiratory diseases17; little is known about the influence of passive smoking on bone metabolism. Only a few studies have investigated how passive smoking could induce negative effects on bone mass and fracture risk18-21. In contrast, extensive data from epidemiological and experimental studies indicate that gene–environmental interaction during pregnancy and early life leads permanent changes in physiological homeostasis, increasing many diseases predisposition by epigenetic mechanisms22. Exposure to tobacco smoke, at the early events during pregnancy and childhood, could promote deleterious effects on the development process and may result in permanent damage23-27.

Despite the evidence supporting the deleterious effects of smoking on bone health in both genders, it is still unclear how smoking impairs bone turnover and reduces bone mass28,29.

Tobacco smoke contains gaseous and particular compounds that induce free radical release which may lead to chronic airway inflammation and tissue destruction30-32. Evidence from studies in dental surgeries have strongly attributed the deleterious effects of smoking as a result of an increase in oxidative stress mechanism33,34.

In trauma surgeries, it has been showed that the reactive organic radicals contained in cigarette smoke induce delayed healing of fractures as well as high risk of nonunion after fracture through cell toxicity and inflammatory process induction35,36,37.

Oxidative stress is a physiological mechanism characterized by an imbalance between oxidants and antioxidants components. This imbalance leads cell damage and consequent release of inflammatory mediators, resulting in structural changes that impair the functionality of compromised organ33.

In this review we summarize some results from clinical, animal models and in vitro studies (Figure 2). that have highlighted the importance of the oxidative stress induced by smoking in the worsening of bone turnover, focusing in bone mineral and organic matrix structural changes.

Increased Reactive Oxygen Species production: Oxidative Stress

Oxidative stress is a physiological mechanism characterized by an imbalance between oxidants and antioxidants components. This imbalance leads to cell damage and consequent release of inflammatory mediators, resulting in structural changes that impair the functionality of compromised organ (Figure 1)38.

JOOS-21-1138-fig1

Figure 1: Oxidative stress is a physiological mechanism that depends on the exogenous and endogenous factors which could lead to an increase of free radicals. These metabolites induce damages of cell membranes and lipoproteins, compromising cells activity. In bone, the increase of ROS leads to an increase in osteocytes and osteoblasts apoptosis as well as a decrease in osteoblasts differentiation. Moreover, the increase in RANK/RANKL activation induces osteoclastogenesis and a sequent bone resorption. These events culminate in changes in organic and mineral matrix, compromising the bone integrity. (ROS: Reactive Oxygen Species; RANK: Receptor Activator of Nuclear Factor κ B; RANKL: Receptor Activator of Nuclear Factor kB ligand; MSCs Mesenchymal stromal cells)

JOOS-21-1138-fig2

Figure 2: The effects of the CS-induced oxidative stress showed in experimental and clinical studies in bone mineral (A) and organic (B) matrix. (ROS: Reactive Oxygen Species; RANKL: Receptor Activator of Nuclear Factor kB ligand)

Enzymatic reactions such as those involved in respiratory chain, cytochrome P450 system, phagocytosis, and prostaglandin synthesis are recognized by oxidants generation39-41. Reactive oxygen species (ROS) are oxygen-containing molecules and free radicals components recognized by their oxidant activity. Among them, Hydroxyl (OH –), superoxide radicals (O2 –), hydrogen peroxide (H2O2), singlet oxygen, and lipid peroxides are the most described. They are composed by one or more unpaired electrons, which makes them highly reactive since they find out another electron to fill their orbital and stabilize their electron balance. These metabolites show little half-life and are difficult to measure in biological samples from humans, but it is possible to measure their deleterious effects in proteins, lipids, and DNA38.

O2- is mainly produced during cellular respiration by mitochondria, also by action of lipoxygenases (LOX) and cyclooxygenases (COX) during the arachidonic acid metabolism and by endothelial and inflammatory cells6. Once formed, O2- will be involved in several reactions that could generate hydroxyl (OH –), hydrogen peroxide (H2O2) and peroxynitrite (ONOO−). Hydroxyl radical (OH•) is the most reactive among all the free radical species and is delivered by Fenton reaction: O2 •− with H2O2, with Fe2+ or Cu+ as a reaction catalyst42-44. Nitric oxide radical (NO)is synthesized from arginine-to-citrulline oxidation by nitric oxide synthase (NOS)42-44.

In addition to endogenous sources, ROS could be generated from exogenous sources. Exposure to environmental pollutants, heavy metals, chemical solvents, cigarette smoke and others that must be degraded or metabolized could induce the production of free radicals45. The maintenance of the exposure to these sources leads the development and progression of different diseases such cancer, chronic obstructive pulmonary diseases, osteoporosis38.

When there was an imbalance between ROS formation and the capability of cells to remove them, the oxidative stress mechanism will occur, affecting cellular structures, such as membranes, proteins, lipids and desoxyribonucleic acid (DNA)46. An excess of hydroxyl radical and peroxynitrite culminates in lipid peroxidation which damages cell membranes and lipoproteins. In proteins, oxidative stress changes their chemical structures which worsens their enzymatic activity. In DNA, the damages induced by oxidative stress leads mutagenesis and also compromises the epigenetic formations38.

To avoid the effects of oxidative stress, cells establish a defensive system based mainly on the production enzymas with antioxidant actions, such as superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx)47.

However, during extensive exposure to exogenous factors such as cigarette smoke, the cells antioxidant capacity is insufficient to avoid the oxidative stress occurrence. Evidence have been attesting that smoking is associated with increase in ROS production since smokers have lower antioxidant enzyme levels and it impacts in bone resorption and bone mass loss29.

The smoking-induced oxidative stress effects in bone turn over

Oxidative stress effects in bone mineral matrix

Inorganic and organic components are present in bone matrix. Although the inorganic constituent of bone matrix is mainly composed by crystalline hydroxyapatite-[Ca3(PO4)2]3 Ca(OH)2, the organic component contains around 20 proteins, and the type I collagen is the most prevalent48. During the bone resorption, the dissolution of crystalline hydroxyapatite occurs earlier than the injury of the organic components49.

Since bone formation requires the recruitment, proliferation and osteogenic differentiation of mesenchymal progenitors cells, the balance between cell activation, cellular activity and cell life span can produce an effect in bone tissue formation and bone density.

The osteocytes, cells in close contact with blood capillaries are considered the major regulators of bone remodeling. The increase in oxidative stress leads to these cells apoptosis which are related to altered bone formation and lower mineral density50,51. Also, osteocyte apoptosis is associated with the increased expression of osteoclastogenic factors and elevation in bone turnover, resulting in bone mass loss52. Moreover, the presence of ROS damages stem cells self-renewal activation and differentiation towards tissure-specific lineages like osteoblasts and osteocytes53. Bone turnover is mainly performed by the osteoclasts and osteoblasts. The activation and proliferation of these cells are regulated by different factors, such as the RANK–RANKL–OPG system, growth factors, cytokines and hormones54. Osteoclasts are large multinuclear cells and are the only cells capable of resorbing the mineralized bone matrix55. The osteoclasts are derived from hematopoietic stem cells (HSCs), which differentiate into bone-resorbing osteoclasts through a series of steps leading to matrix disruption56. The maturation of HSCs into osteoclasts is driven forward by several crucial steps and is highly dependent on the presence of Receptor Activator for Nuclear Factor κ B (RANK), the cytokine macrophage stimulating factor (MCS-F) as well as the regulator osteoprotegerin (OPG)57.

Osteoblasts are cells derived from mesenchymal progenitors in the bone marrow. They are accumulated in larger groups producing the extracellular matrix components, which is initially unmineralized58.

The bone turnover is a complex process and the effectiveness of signaling pathway OPG/RANK/RANKL prevents the bone loss59. RANKL is expressed by osteoblasts, osteocytes and other mesenchymal lineage cells60. RANKL by binding to its receptor RANK expressed by osteoclasts induces this cell type differentiation and activation. OPG is a circulating receptor that binds to RANKL, inhibiting the osteoclastogenesis, and are present in bone and vascular endothelial cells61,62.

The deficiency of RANKL was described associated with severe osteoporosis in mice and decreased osteoclasts activity in in vitro studies63,64. In smokers, the imbalance of OPG/RANK/RANKL signaling pathways was described associated with decreased bone mineral density (BMD) and higher susceptibility to bone fractures65,66 and some studies have attributed these effects to an increase in reactive oxygen species.

The RANK activation by RANKL induces an increase in reactive oxygen species (ROS) release67,68, and the excessive activity of osteoclasts has been described in bone diseases such as osteoporosis67,69,70.

In a periodontitis mice model, Kubota et al.71 demonstrated that the systemic administration of cigarette smoke condensate or nicotine accelerated the alveolar bone destruction through an increased expression of RANKL by osteoclasts.

In this context, Kim et al.70 showed in experimental and in vitro studies that an antioxidant protein capable of destroying ROS72-79, negatively regulated RANKL stimulated signals and reduced the osteoclastogenesis in bone, under normal and injury conditions.

Corroborating with these data, some findings have attested the antioxidant effects by using a resveratrol and resveratrol-like compounds, resulting in downregulation in osteoclastogenesis and osteoclast activity in periodontal diseases, revealing this therapeutic approach as promissor in improving the bone healing processes even under smoking conditions80,81.

Also, increased levels of oxidants, such as isoprostane (iso-PGF2α) in urine and plasma samples have been demonstrated in association with reduced bone mineral density82,83. These results highlighted possible markers to monitor the increased oxidative stress occurrence associated with reduced bone mineral density as well the possibility of treatments with antioxidants to control the osteoporosis progression.

Oxidative stress effects in bone organic matrix

The organic components of bone tissue include collagen fiber types I and V, proteoglycans, growth factors and cytokines. Type I collagen represents approximately 90% of the total collagen forming the protein scaffold upon which mineral is deposited84. The pattern of collagen fibers distribution in mature bone is characterized by dense parallel layers that alternate between parallel and orthogonal distribution85-87.

Type I collagen are not only the most abundant component in organic matrix, but also contributes to tissue organization due its mechanical properties and fibril distribution, that it is essential for mineralization process86,87. In this context, the damage of type I collagen synthesis has dramatic effects on the skeleton88.

Sasaki et al. demonstrate that long-term CS exposure in mice impairs the normal growth of lumbar vertebral bodies and deteriorates vertebral bone quality, and these results were attributed mainly to disorientation of newly total collagen fibers that were replaced during remodeling process after the CS-induced injury in bone tissue89.

Other important collagen subtype in bone turnover is the collagen type V. Although, it counts for < 3% of total collagen, this is a regulatory fibril-forming collagen since regulates the fibrillogenesis of the collagen types I and III. In a previous study, we showed in mice, that cigarette smoke exposure alters bone matrix composition and impairs bone mineralization resulting in bone fragility. It occurs due to increased production and deposition of collagen V with a concomitant decrease of collagen type I84.

The organic components of bone matrix are mainly produced by the osteoblasts and these cells activity could be compromised by excessive oxidative stress. Thus, oxidative stress has been recognized as important factor to impair bone formation in postmenopausal and senile osteoporosis90,91.

Zhang et al.92 showed in transgenic mice that deficiency in FoxO1, a protein that modulate the expression of genes involved in cell differentiation, DNA damage repair, and oxidative stress, induced a decrease in osteoblasts differentiation and an increase in caspase-3 activity, resulting in these cells apoptosis. Authors demonstrated that FoxO1 provides a favorable intracellular environment for osteoblast functions by defensing against the adverse effects of oxidative stress.

To better elucidate the CS-induced effects in osteoblasts, the most used approach is to test the different levels of nicotine in in vitro studies. The increase in oxidative stress induced by nicotine has been demonstrated in osteoblasts, worsening this cell function6. Moreover, these effects seem to be dose-dependent, at high concentrations of nicotine, osteoblast-like cells demonstrate decreased proliferation and impaired collagen synthesis93, whereas at low levels these cells are stimulated34.

It is important to note that different ways of nicotine administration could interfere in its systemic absorption, altering bone turnover impact. The inhalation of nicotine induces higher levels of this substance compared with subcutaneously administration. Thus, clinical studies have been showed that the interruption of smoking habit before the elective surgeries diminishes the time required for bone healing as well the complications after surgery94. Lower levels of nicotine and cotinine, that is a compound of nicotine, are detected in serum and urine of patients after smoking cessation95. Probably, part of these benefits could be attributed to the decreased systemic levels of nicotine and a consequent oxidative stress reduction after a smoking cessation.

Clinical aspects of smoking and bone health

Osteoporosis is characterized by low BMD and weakening of bone tissue, which leads to gradual bone fragility and can causes fractures. Among all the treatable causes of osteoporosis, smoking has been established as an important contributing risk factor. It affects the balance of the naturally occurring processes of bone resorption and bone formation, resulting in low BMD as the amount resorbed is not totally replaced29.

Few studies are available regarding the pathophysiological mechanisms by which smoking would lead to bone loss and the assessment of the clinical association of them. Smoking is thought to cause low bone density through numerous pathways.

Among the currently available studies, there is the fact that, in general, smokers have lower weight and body mass index (BMI), which is postulated to provide an osteogenic stimulus and it is linked to higher BMD6,29. They also found lower serum levels of vitamin D in smokers, which is required for good bone health. Furthermore, there is an impaired intestinal calcium absorption associated with changes in the metabolism of calciotropic hormones. Smoking has been linked to changes in hormone household, leading to a decrease in parathyroid hormone (i.e., responsible for the reducing calcium absorption) and low estrogen levels, as well as to a state of hypercortisolism and high levels of adrenal androgens6,8,29,96. Those changes have been linked to an increased risk of osteoporosis. It is imperative to reassure that woman who smoke have alterations in the metabolism of sex hormones leading to a lower level of estradiol and menopause at an earlier age when compared to non-smokers96. When men are evaluated, the studies are conflicting, but some have shown inhibition of aromatase (similar to that found in women) and, consequently, reduced production of estradiol from testosterone. In addition, there is a negative impact on the angiogenesis required for bone metabolism29.

Smokers are more likely to suffer from peripheral vascular disease, reducing the bone blood supply. As smokers are weaker with less lean mass, they have poorer balance and impaired neuromuscular performance, which may also increase the risk of falls29.

Few studies are available regarding the effect of smoking cessation on bone health. One study found an intermediate risk of fracture in ex-smokers. And another one discovered that the effect of smoking on bone density was reversible, and the bone density of ex-smokers improved in less than 10 years (i.e., may be partially reversible), and there is a dose-response relationship for the amount in pack-years smoked and fracture risk. Remarkably, other studies reported that the effects of smoking cessation in postmenopausal women produced improvement in gonadal hormones, level of bone formation, and resorption markers and improvement in the bone density after cessation/reduction29, 97, 98.

Another two studies reported that subjects exposed to secondhand smoke had significantly lower phalangeal BMD and higher risk for femoral neck osteoporosis than unexposed subjects29, 97, 98.

OS is generated as a result of insufficient activity of the endogenous antioxidant defense system against reactive oxygen species (ROS)99. The results have been further shown by cross-sectional and case-control studies, in which OS was characterized by a high level of F2-isoprostanes in urine and a low level of antioxidant enzymes in blood, along with a reduced bone mineral density and an increased risk of osteoporosis100,101. Studies suggested that homocysteine (Hcy) played an important role in bone metabolism and had been involved in osteoporotic facture incidence102-104. The results of a meta-analysis showed increased Hcy and nitric oxide (NO) in the postmenopausal osteoporosis (PO) subjects, while it showed decreased levels of folate and total antioxidant power (TAP), along with lower activity of superoxide dismutase (SOD) and glutathione peroxidase (GPx) in these subjects. The imbalance of ROS and antioxidant system may contribute to functional and structural remodeling that favors the occurrence of PO99.

Final considerations and new directions

Despite of clinical evidence of increased incidence of bone diseases amongst smokers as well as worsening recovery in orthopedic surgeries, it is still unclear which pathological mechanisms are induced by CS and how these events impair bone turnover.

To describe these pathological mechanisms, animal models and in vitro studies have been performed to describe different bone cells activities and signaling pathways regulating cells interactions. Part of these findings pointed out the CS-induced oxidative stress importance in the impairment of bone turnover resulting in damage of mineral and organic bone matrix which corroborate with clinical studies that have extensively showed lower BMD and increased bone fragility in smokers.

Although it is difficult to perform measurement of ROS due to its short half-life, there are some clinical studies that showed increased levels of F2 isoprostanes as well as 8-isoprostanes in urine samples form smokers compared with non-smokers105 and in patients with osteoporosis, revealing the oxidative stress occurrence. However, until now, the majority of experimental and clinical studies have evaluated levels of vitamins, or antioxidant enzymes, which are informative; but they only reflect one side of the redox homeostasis, leaving the question of whether decreased levels are actually indicative of increased oxidative stress occurrence99. In this context, the administration of antioxidant compounds showed a reduction in ROS production in experimental studies and beneficial results in smokers with periodontal diseases, revealing this therapeutic approach as promisor to ameliorate bone healing even under smoking conditions.

Clinical management are still mainly based in radiographic images. X-Rays and CT-Scans reveal only the final result of bone structural changes. It is not possible to investigate the different cell types and not even the components of bone matrix separately. Moreover, the majority of these exams detect structural changes only after the establishment of bone diseases that are worsening by smoking.

The association between radiographic images and specific biomarkers in serum could be useful to facilitate the clinical management. These measurements could be performed in tissue as well in serum or urine samples to evaluate the impact of smoking cessation in the diminishment of oxidative stress markers and how it impacts bone turnover, revealing the best moment for elective orthopedic surgeries. Also, it will be useful to evaluate the efficacy of different treatments, such as antioxidants, in different bone diseases that are worsening by smoking.

Conflict of Interest

The authors declare no conflicts of interest.

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Article Info

Article Notes

  • Published on: July 09, 2021

Keywords

  • Smoking

  • Bone loss
  • Bone turnover
  • Bone matrix
  • Oxidative stress
  • Bone fragility

*Correspondence:

Dr. Alexandre Póvoa Barbosa,
Departments of Orthopaedics and Rheumatology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil;
Email: ortopediabarbosa@gmail.com

©2021 Barbosa AP. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License.