scholarly journals A New Insight to Bone Turnover: Role of -3 Polyunsaturated Fatty Acids

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Naroa Kajarabille ◽  
Javier Díaz-Castro ◽  
Silvia Hijano ◽  
Magdalena López-Frías ◽  
Inmaculada López-Aliaga ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Bone Turnover ◽  
Polyunsaturated Fatty Acids ◽  
Bone Metabolism ◽  
Bone Health ◽  
Osteoclast Formation ◽  
Dietary Lipids ◽  
Pufa Supplementation

Background. Evidence has shown that long-chain polyunsaturated fatty acids (LCPUFA), especially theω-3 fatty acids such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are beneficial for bone health and turnover.Objectives. This review summarizes findings from bothin vivoandin vitrostudies and the effects of LC PUFA on bone metabolism, as well as the relationship with the oxidative stress, the inflammatory process, and obesity.Results. Some studies in humans indicate that LCPUFA can increase bone formation, affect peak bone mass in adolescents, and reduce bone loss. However, the cellular mechanisms of action of the LCPUFA are complex and involve modulation of fatty acid metabolites such as prostaglandins, resolvins and protectins, several signaling pathways, cytokines, and growth factors, although in certain aspects there is still some controversy. LCPUFA affect receptor activator of nuclear factorκβ(RANK), a receptor found on the osteoclast, causing bone resorption, which controls osteoclast formation.Conclusions. Since fatty acids are an endogenous source of reactive oxygen species, free radicals alter the process of bone turnover; however, although there are clinical evidences linking bone metabolism and dietary lipids, more clinical trials are necessary to prove whetherω-3 PUFA supplementation plays a major role in bone health.

scholarly journals Immunological Reaction in TNF-α-Mediated Osteoclast Formation and Bone ResorptionIn VitroandIn Vivo

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Hideki Kitaura ◽  
Keisuke Kimura ◽  
Masahiko Ishida ◽  
Haruka Kohara ◽  
Masako Yoshimatsu ◽  
...  
Keyword(s):  
T Cells ◽  
Bone Metabolism ◽  
Stromal Cells ◽  
Fas Ligand ◽  
Bone Marrow Cells ◽  
Bone Destruction ◽  
Osteoclast Formation ◽  
Bone Diseases

Tumor necrosis factor-α(TNF-α) is a cytokine produced by monocytes, macrophages, and T cells and is induced by pathogens, endotoxins, or related substances. TNF-αmay play a key role in bone metabolism and is important in inflammatory bone diseases such as rheumatoid arthritis. Cells directly involved in osteoclastogenesis include macrophages, which are osteoclast precursor cells, osteoblasts, or stromal cells. These cells express receptor activator of NF-κB ligand (RANKL) to induce osteoclastogenesis, and T cells, which secrete RANKL, promote osteoclastogenesis during inflammation. Elucidating the detailed effects of TNF-αon bone metabolism may enable the identification of therapeutic targets that can efficiently suppress bone destruction in inflammatory bone diseases. TNF-αis considered to act by directly increasing RANK expression in macrophages and by increasing RANKL in stromal cells. Inflammatory cytokines such as interleukin- (IL-) 12, IL-18, and interferon-γ(IFN-γ) strongly inhibit osteoclast formation. IL-12, IL-18, and IFN-γinduce apoptosis in bone marrow cells treated with TNF-α  in vitro, and osteoclastogenesis is inhibited by the interactions of TNF-α-induced Fas and Fas ligand induced by IL-12, IL-18, and IFN-γ. This review describes and discusses the role of cells concerned with osteoclast formation and immunological reactions in TNF-α-mediated osteoclastogenesisin vitroandin vivo.

scholarly journals n-3 polyunsaturated fatty acids abrogate mTORC1/2 signaling and inhibit adrenocortical carcinoma growth in vitro and in vivo

2016 ◽  
Vol 35 (6) ◽  
pp. 3514-3522 ◽  
Author(s):  
JUN LIU ◽  
MEINIAN XU ◽  
YONGBIN ZHAO ◽  
CHUNPING AO ◽  
YUKUN WU ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Polyunsaturated Fatty Acids ◽  
Adrenocortical Carcinoma

scholarly journals Role of Omega-3 Polyunsaturated Fatty Acids in the Production of Prostaglandin E2and Nitric Oxide during Experimental Murine Paracoccidioidomycosis

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
S. C. Sargi ◽  
M. M. O. Dalalio ◽  
A. G. Moraes ◽  
J. E. L. Visentainer ◽  
D. R. Morais ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Polyunsaturated Fatty Acids ◽  
Peritoneal Macrophages ◽  
Omega 3 Fatty Acids ◽  
Omega 3 ◽  
Potential Health ◽  
Macrophage Activity ◽  
Experimental Paracoccidioidomycosis

There has recently been increased interest in the potential health effects of omega-3 polyunsaturated fatty acids on the immune system. Paracoccidioidomycosis is the most important endemic mycosis in Latin America. Macrophages have a fundamental role and act as first line of organism defense. The purpose of this study was to analyze the effect of n-3 fatty acids on the production of PGE2and NO by mice infected with Pb18 and fed a diet enriched with LNA for 8 weeks. To study the effect of omega-3 fatty acids on macrophage activity during experimental paracoccidioidomycosis, mice were infected with Pb18 and fed a diet supplemented with LNA. PGE2in the serum of animals was analyzed and NO in the supernatants of macrophages cultured and challengedin vitrowith Pb18 was measured. Omega-3 fatty acids seemed to decrease the production of PGE2in vivoin the infected group fed an LNA-supplemented diet during the 4th and 8th weeks of the experiment. At the same time, we observed an increase in synthesis of NO by peritoneal macrophages in this group. Omega-3 fatty acids thus appear to have an immunomodulatory effect in paracoccidioidomycosis.

scholarly journals Polyunsaturated fatty acids modulate prostaglandin synthesis by ovine amnion cells in vitro

Reproduction ◽  
2010 ◽  
Vol 140 (6) ◽  
pp. 943-951 ◽  
Author(s):  
S E Kirkup ◽  
Z Cheng ◽  
M Elmes ◽  
D C Wathes ◽  
D R E Abayasekara
Keyword(s):  
Fatty Acids ◽  
Polyunsaturated Fatty Acids ◽  
Linolenic Acid ◽  
Stearidonic Acid ◽  
Prostaglandin Synthesis ◽  
Late Gestation ◽  
Prostaglandin E ◽  
Pufa Supplementation ◽  
Pufa Composition

Diets or supplements high in n-3 and n-6 polyunsaturated fatty acids (PUFAs) have been shown to influence the timing of parturition. PUFAs are substrates for prostaglandin (PG) synthesis, and PGs play central roles in parturition. Hence, the effects of altering PUFA composition may be mediated through alterations in the type and relative quantities of PGs synthesised. Therefore, we have investigated the effects of a range of n-3 and n-6 PUFAsin vitroon PG synthesis by amnion cells of late gestation ewes. The n-6 PUFA, arachidonic acid (20:4, n-6), increased synthesis of two-series PGs. Degree of stimulation induced by the n-6 PUFAs was dependent on the position of the PUFA in the PG synthetic pathway, i.e. PG production of the two-series (principally prostaglandin E2:PGE2) increased progressively with longer chain PUFAs. Effects of n-3 PUFAs on output of PGE2were more modest and variable. The two shorter chain n-3 PUFAs, α-linolenic acid (18:3, n-3) and stearidonic acid (18:4, n-3), induced a small but significant increase in PGE2output, while the longest chain n-3 PUFA docosahexaenoic acid (22:6, n-3) inhibited PGE2synthesis. Dihomo-γ-linolenic acid (20:3, n-6), the PUFA substrate for synthesis of one-series PGs, induced an increase in PGE1generation and a decrease in PGE2and PGE3outputs. Hence, we have demonstrated that PUFA supplementation of ovine amnion cellsin vitroaffects the type and quantity of PGs synthesised.

scholarly journals Supplemental N-3 Polyunsaturated Fatty Acids Limit A1-Specific Astrocyte Polarization via Attenuating Mitochondrial Dysfunction in Ischemic Stroke in Mice

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jun Cao ◽  
Lijun Dong ◽  
Jialiang Luo ◽  
Fanning Zeng ◽  
Zexuan Hong ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Ischemic Stroke ◽  
Polyunsaturated Fatty Acids ◽  
Mitochondrial Dysfunction ◽  
Artery Occlusion ◽  
Mice Model ◽  
Neuron Death ◽  
The Impact

Ischemic stroke is one of the leading causes of death and disability for adults, which lacks effective treatments. Dietary intake of n-3 polyunsaturated fatty acids (n-3 PUFAs) exerts beneficial effects on ischemic stroke by attenuating neuron death and inflammation induced by microglial activation. However, the impact and mechanism of n-3 PUFAs on astrocyte function during stroke have not yet been well investigated. Our current study found that dietary n-3 PUFAs decreased the infarction volume and improved the neurofunction in the mice model of transient middle cerebral artery occlusion (tMCAO). Notably, n-3 PUFAs reduced the stroke-induced A1 astrocyte polarization both in vivo and in vitro. We have demonstrated that exogenous n-3 PUFAs attenuated mitochondrial oxidative stress and increased the mitophagy of astrocytes in the condition of hypoxia. Furthermore, we provided evidence that treatment with the mitochondrial-derived antioxidant, mito-TEMPO, abrogated the n-3 PUFA-mediated regulation of A1 astrocyte polarization upon hypoxia treatment. Together, this study highlighted that n-3 PUFAs prevent mitochondrial dysfunction, thereby limiting A1-specific astrocyte polarization and subsequently improving the neurological outcomes of mice with ischemic stroke.

scholarly journals Prebiotics, Probiotics and Synbiotic for Bone Health

2021 ◽  
Author(s):  
Bolaji Lilian Ilesanmi-Oyelere ◽  
Marlena Cathorina Kruger
Keyword(s):  
Fatty Acids ◽  
Bone Resorption ◽  
Bone Health ◽  
Calcium Absorption ◽  
Osteoclast Differentiation ◽  
Short Chain Fatty Acids ◽  
Short Chain ◽  
Micro Organisms

Prebiotics, probiotics and synbiotics has been shown to enhance calcium absorption, gut and bone health. Probiotics are also known to ferment prebiotics to produce the fermentative substrates such as short chain fatty acids (SCFAs), mainly acetate, butyrate and propionate with the help of beneficial micro-organisms in the gut. The expression of these SCFAs has been associated with the inhibition of osteoclast differentiation and bone resorption both in vitro and in vivo. In this review, we discuss the benefits of SCFAs and ways in which prebiotics and probiotics affect bone health by the reduction of inflammation in the gut and the bone.

Effect of polyunsaturated fatty acids on diphenyl hydantoin-induced genetic damage in vitro and in vivo

2009 ◽  
Vol 80 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Shivani Ponnala ◽  
Kaipa P. Rao ◽  
Jaideep R. Chaudhury ◽  
Jaleel Ahmed ◽  
B. Rama Rao ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Polyunsaturated Fatty Acids ◽  
Genetic Damage

scholarly journals n-3 Polyunsaturated Fatty Acids Impede the TCR Mobility and the TCR–pMHC Interaction of Anti-Viral CD8+ T Cells

Viruses ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 639 ◽  
Author(s):  
Younghyun Lim ◽  
Seyoung Kim ◽  
Sehoon Kim ◽  
Dong-In Kim ◽  
Kyung Won Kang ◽  
...  
Keyword(s):  
Fatty Acids ◽  
T Cells ◽  
T Cell ◽  
Polyunsaturated Fatty Acids ◽  
Cd8 T Cells ◽  
Cd8 T Cell ◽  
Omega 3 ◽  
In Vivo Models

The immune-suppressive effects of omega-3 (n-3) polyunsaturated fatty acids (PUFAs) on T cells have been observed via multiple in vitro and in vivo models. However, the precise mechanism that causes these effects is still undefined. In this study, we investigated whether n-3 PUFAs regulated T cell receptor (TCR) and peptide-major histocompatibility complex (pMHC) interactions. The expansion of anti-viral CD8+ T cells that endogenously synthesize n-3 PUFAs (FAT-1) dramatically decreased upon lymphocytic choriomeningitis virus (LCMV) infection in vivo. This decrease was not caused by the considerable reduction of TCR expression or the impaired chemotactic activity of T cells. Interestingly, a highly inclined and laminated optical sheet (HILO) microscopic analysis revealed that the TCR motility was notably reduced on the surface of the FAT-1 CD8+ T cells compared to the wild type (WT) CD8+ T cells. Importantly, the adhesion strength of the FAT-1 CD8+ T cells to the peptide-MHC was significantly lower than that of the WT CD8+T cells. Consistent with this result, treatment with docosahexaenoic acid (DHA), one type of n-3 PUFA, significantly decreased CD8+ T cell adhesion to the pMHC. Collectively, our results reveal a novel mechanism through which n-3 PUFAs decrease TCR-pMHC interactions by modulating TCR mobility on CD8+ T cell surfaces.

The effect of polyunsaturated fatty acids on bone health

2011 ◽  
Vol 21 (3) ◽  
pp. 219-232
Author(s):  
Marcello Maggio ◽  
Andrea Artoni ◽  
Fulvio Lauretani ◽  
Carmelinda Ruggiero ◽  
Tommy Cederholm ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Polyunsaturated Fatty Acids ◽  
Bone Metabolism ◽  
Bone Health ◽  
Large Body ◽  
Elderly Subjects ◽  
Omega 3 ◽  
Membrane Function ◽  
Wide Range ◽  
Omega 6

SummaryThe essential polyunsaturated fatty acids (PUFAs) are divided into two classes, n-3 (ω-3) and n-6 (ω-6) and their dietary precursors are α-linolenic (ALA) and linoleic acid (LA), respectively. PUFAs are precursors of a wide range of metabolites, for example eicosanoids like prostaglandins and leukotrienes, which play critical roles in the regulation of a variety of biological processes, including bone metabolism.A large body of evidence supports an effect of PUFA on bone metabolism which may be mediated by regulation of osteoblastogenesis and osteoclast activity, change of membrane function, decrease in inflammatory cytokines, such as interleukin-1 (IL-1), interleukin-6 (IL-6), and tumour necrosis factor alpha (TNF-α), modulation of peroxisome proliferators-activated receptor γ (PPARγ) and influence in NO secretion and NO synthase.Animal studies have shown that a higher dietary omega-3/omega-6 fatty acids ratio is associated with beneficial effects on bone health. Human studies conducted in elderly subjects suggest that omega-3 instead of omega-6 has a positive effect on bone metabolism. In spite of increasing evidence, studies conducted in humans do not allow us to draw a definitive conclusion on the usefulness of PUFAs in clinical practice.

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