1
|
McFarlin BK, Bridgeman EA, Curtis JH, Vingren JL, Hill DW. Baker's yeast beta glucan supplementation was associated with an improved innate immune mRNA expression response after exercise. Methods 2024; 230:68-79. [PMID: 39097177 DOI: 10.1016/j.ymeth.2024.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2024] [Accepted: 07/31/2024] [Indexed: 08/05/2024] Open
Abstract
Beta glucans are found in many natural sources, however, only Baker's Yeast Beta Glucan (BYBG) has been well documented to have structure-function effects that are associated with improved innate immune response to stressors (e.g., exercise, infection, etc.). The purpose was to identify a BYBG-associated mRNA expression pattern following exercise. Participants gave IRB-approved consent and were randomized to BYBG (Wellmune®; N=9) or Placebo (maltodextrin; N=10) for 6-weeks prior to performing 90 min of whole-body exercise. Paxgene blood samples were collected prior to exercise (PRE), after exercise (POST), two hours after exercise (2H), and four hours after exercise (4H). Total RNA was isolated and analyzed for the expression of 770 innate immune response mRNA (730 mRNA targets; 40 housekeepers/controls; Nanostring nCounter). The raw data were normalized against housekeeping controls and expressed as Log2 fold change from PRE for a given condition. Significance was set at p < 0.05 with adjustments for multiple comparisons and false discovery rate. We identified 47 mRNA whose expression was changed after exercise with BYBG and classified them to four functional pathways: 1) Immune Cell Maturation (8 mRNA), 2) Immune Response and Function (5 mRNA), 3) Pattern Recognition Receptors and DAMP or PAMP Detection (25 mRNA), and 4) Detection and Resolution of Tissue Damage (9 mRNA). The identified mRNA whose expression was altered after exercise with BYBG may represent an innate immune response pattern and supports previous conclusions that BYBG improves immune response to a future sterile inflammation or infection.
Collapse
Affiliation(s)
- Brian K McFarlin
- Applied Physiology Laboratory, University of North Texas, Denton, TX 76203, United States; University of North Texas, Dept. of Biological Sciences, Denton, TX 76203, United States.
| | - Elizabeth A Bridgeman
- Applied Physiology Laboratory, University of North Texas, Denton, TX 76203, United States.
| | - John H Curtis
- Applied Physiology Laboratory, University of North Texas, Denton, TX 76203, United States.
| | - Jakob L Vingren
- Applied Physiology Laboratory, University of North Texas, Denton, TX 76203, United States; University of North Texas, Dept. of Biological Sciences, Denton, TX 76203, United States.
| | - David W Hill
- Applied Physiology Laboratory, University of North Texas, Denton, TX 76203, United States.
| |
Collapse
|
2
|
Pesti I, Barczánfalvi G, Dulka K, Kata D, Farkas E, Gulya K. Bafilomycin 1A Affects p62/SQSTM1 Autophagy Marker Protein Level and Autophagosome Puncta Formation Oppositely under Various Inflammatory Conditions in Cultured Rat Microglial Cells. Int J Mol Sci 2024; 25:8265. [PMID: 39125836 PMCID: PMC11311604 DOI: 10.3390/ijms25158265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2024] [Revised: 07/25/2024] [Accepted: 07/27/2024] [Indexed: 08/12/2024] Open
Abstract
Regulation of autophagy through the 62 kDa ubiquitin-binding protein/autophagosome cargo protein sequestosome 1 (p62/SQSTM1), whose level is generally inversely proportional to autophagy, is crucial in microglial functions. Since autophagy is involved in inflammatory mechanisms, we investigated the actions of pro-inflammatory lipopolysaccharide (LPS) and anti-inflammatory rosuvastatin (RST) in secondary microglial cultures with or without bafilomycin A1 (BAF) pretreatment, an antibiotic that potently inhibits autophagosome fusion with lysosomes. The levels of the microglia marker protein Iba1 and the autophagosome marker protein p62/SQSTM1 were quantified by Western blots, while the number of p62/SQSTM1 immunoreactive puncta was quantitatively analyzed using fluorescent immunocytochemistry. BAF pretreatment hampered microglial survival and decreased Iba1 protein level under all culturing conditions. Cytoplasmic p62/SQSTM1 level was increased in cultures treated with LPS+RST but reversed markedly when BAF+LPS+RST were applied together. Furthermore, the number of p62/SQSTM1 immunoreactive autophagosome puncta was significantly reduced when RST was used but increased significantly in BAF+RST-treated cultures, indicating a modulation of autophagic flux through reduction in p62/SQSTM1 degradation. These findings collectively indicate that the cytoplasmic level of p62/SQSTM1 protein and autophagocytotic flux are differentially regulated, regardless of pro- or anti-inflammatory state, and provide context for understanding the role of autophagy in microglial function in various inflammatory settings.
Collapse
Affiliation(s)
- István Pesti
- Department of Cell Biology and Molecular Medicine, University of Szeged, 6720 Szeged, Hungary; (I.P.); (G.B.); (K.D.); (E.F.)
- HCEMM-USZ Group of Cerebral Blood Flow and Metabolism, University of Szeged, 6720 Szeged, Hungary
| | - Gábor Barczánfalvi
- Department of Cell Biology and Molecular Medicine, University of Szeged, 6720 Szeged, Hungary; (I.P.); (G.B.); (K.D.); (E.F.)
| | - Karolina Dulka
- Department of Cell Biology and Molecular Medicine, University of Szeged, 6720 Szeged, Hungary; (I.P.); (G.B.); (K.D.); (E.F.)
| | - Diana Kata
- Department of Laboratory Medicine, University of Szeged, 6725 Szeged, Hungary;
| | - Eszter Farkas
- Department of Cell Biology and Molecular Medicine, University of Szeged, 6720 Szeged, Hungary; (I.P.); (G.B.); (K.D.); (E.F.)
- HCEMM-USZ Group of Cerebral Blood Flow and Metabolism, University of Szeged, 6720 Szeged, Hungary
| | - Karoly Gulya
- Department of Cell Biology and Molecular Medicine, University of Szeged, 6720 Szeged, Hungary; (I.P.); (G.B.); (K.D.); (E.F.)
| |
Collapse
|
3
|
Chmielarz M, Sobieszczańska B, Środa-Pomianek K. Metabolic Endotoxemia: From the Gut to Neurodegeneration. Int J Mol Sci 2024; 25:7006. [PMID: 39000116 PMCID: PMC11241432 DOI: 10.3390/ijms25137006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Revised: 06/22/2024] [Accepted: 06/23/2024] [Indexed: 07/16/2024] Open
Abstract
Metabolic endotoxemia is a severe health problem for residents in developed countries who follow a Western diet, disrupting intestinal microbiota and the whole organism's homeostasis. Although the effect of endotoxin on the human immune system is well known, its long-term impact on the human body, lasting many months or even years, is unknown. This is due to the difficulty of conducting in vitro and in vivo studies on the prolonged effect of endotoxin on the central nervous system. In this article, based on the available literature, we traced the path of endotoxin from the intestines to the blood through the intestinal epithelium and factors promoting the development of metabolic endotoxemia. The presence of endotoxin in the bloodstream and the inflammation it induces may contribute to lowering the blood-brain barrier, potentially allowing its penetration into the central nervous system; although, the theory is still controversial. Microglia, guarding the central nervous system, are the first line of defense and respond to endotoxin with activation, which may contribute to the development of neurodegenerative diseases. We traced the pro-inflammatory role of endotoxin in neurodegenerative diseases and its impact on the epigenetic regulation of microglial phenotypes.
Collapse
Affiliation(s)
- Mateusz Chmielarz
- Department of Microbiology, Wroclaw University of Medicine, Chalubinskiego 4 Street, 50-368 Wroclaw, Poland
| | - Beata Sobieszczańska
- Department of Microbiology, Wroclaw University of Medicine, Chalubinskiego 4 Street, 50-368 Wroclaw, Poland
| | - Kamila Środa-Pomianek
- Department of Biophysics and Neuroscience, Wroclaw University of Medicine, Chalubinskiego 3a, 50-368 Wroclaw, Poland
| |
Collapse
|
4
|
Wang D, Ma X, Hu H, Ren J, Liu J, Zhou H. Functional identification of two HMGB1 paralogues provides insights into autophagic machinery in teleost. FISH & SHELLFISH IMMUNOLOGY 2024; 147:109457. [PMID: 38387685 DOI: 10.1016/j.fsi.2024.109457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 02/08/2024] [Accepted: 02/15/2024] [Indexed: 02/24/2024]
Abstract
High mobility group box 1 (HMGB1) is a multifunctional regulator that plays different roles in various physiological and pathological processes including cell development, autophagy, inflammation, tumor metastasis, and cell death based on its cellular localization. Unlike mammalian HMGB1, two HMGB1 paralogues (HMGB1a and HMGB1b) have been found in fathead minnow and other fish species and its function as an inflammatory cytokine has been well investigated. However, the role of fish HMGB1 in autophagy regulation has not been well clarified. In the present study, we generated HMGB1 paralogues single (HMGB1a-/- and HMGB1b-/-) and double knockout (DKO) epithelioma papulosum cyprini (EPC) cells from fathead minnow by CRISPR/Cas9 system, and the knockout efficiency of these genes was verified at both gene and protein levels. In this context, the effects of HMGB1 gene knockout on the protein expression of microtubule-associated protein 1 light chain 3 II (LC3-II), an autophagy marker, were determined, showing that single knockout of two HMGB1 paralogues significantly decreased the expression of LC3-II, and these inhibitory effects were further amplified in HMGB1 DKO cells under both basal and rapamycin treatment conditions, indicating the role of two HMGB1 paralogues in fish autophagy. In agreement with this notion, overexpression of HMGB1a or HMGB1b with Flag-tag markedly upregulated LC3-II protein expression. Interestingly, overexpressing two paralogues distributed in both cytoplasm and nucleus. Finally, the role of HMGB1-mediated autophagy was further explored, finding that HMGB1 could interact with Beclin1, a key initiation factor of autophagy. Taken together, these findings highlighted the role of HMGB1 paralogues as the autophagy regulator and increased our understanding of autophagic machinery in teleost.
Collapse
Affiliation(s)
- Dan Wang
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Xiaoyu Ma
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Hengyi Hu
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Jingqi Ren
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Jiaxi Liu
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Hong Zhou
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.
| |
Collapse
|
5
|
Seol SI, Davaanyam D, Oh SA, Lee EH, Han PL, Kim SW, Lee JK. Age-Dependent and Aβ-Induced Dynamic Changes in the Subcellular Localization of HMGB1 in Neurons and Microglia in the Brains of an Animal Model of Alzheimer's Disease. Cells 2024; 13:189. [PMID: 38247880 PMCID: PMC10814163 DOI: 10.3390/cells13020189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 12/12/2023] [Accepted: 01/15/2024] [Indexed: 01/23/2024] Open
Abstract
HMGB1 is a prototypical danger-associated molecular pattern (DAMP) molecule that co-localizes with amyloid beta (Aβ) in the brains of patients with Alzheimer's disease. HMGB1 levels are significantly higher in the cerebrospinal fluid of patients. However, the cellular and subcellular distribution of HMGB1 in relation to the pathology of Alzheimer's disease has not yet been studied in detail. Here, we investigated whether HMGB1 protein levels in brain tissue homogenates (frontal cortex and striatum) and sera from Tg-APP/PS1 mice, along with its cellular and subcellular localization in those regions, differed. Total HMGB1 levels were increased in the frontal cortices of aged wildtype (7.5 M) mice compared to young (3.5 M) mice, whereas total HMGB1 levels in the frontal cortices of Tg-APP/PS1 mice (7.5 M) were significantly lower than those in age-matched wildtype mice. In contrast, total serum HMGB1 levels were enhanced in aged wildtype (7.5 M) mice and Tg-APP/PS1 mice (7.5 M). Further analysis indicated that nuclear HMGB1 levels in the frontal cortices of Tg-APP/PS1 mice were significantly reduced compared to those in age-matched wildtype controls, and cytosolic HMGB1 levels were also significantly decreased. Triple-fluorescence immunohistochemical analysis indicated that HMGB1 appeared as a ring shape in the cytoplasm of most neurons and microglia in the frontal cortices of 9.5 M Tg-APP/PS1 mice, indicating that nuclear HMGB1 is reduced by aging and in Tg-APP/PS1 mice. Consistent with these observations, Aβ treatment of both primary cortical neuron and primary microglial cultures increased HMGB1 secretion in the media, in an Aβ-dose-dependent manner. Our results indicate that nuclear HMGB1 might be translocated from the nucleus to the cytoplasm in both neurons and microglia in the brains of Tg-APP/PS1 mice, and that it may subsequently be secreted extracellularly.
Collapse
Affiliation(s)
- Song-I Seol
- Department of Anatomy, Inha University School of Medicine, Incheon 22212, Republic of Korea; (S.-I.S.); (D.D.); (S.-A.O.)
| | - Dashdulam Davaanyam
- Department of Anatomy, Inha University School of Medicine, Incheon 22212, Republic of Korea; (S.-I.S.); (D.D.); (S.-A.O.)
| | - Sang-A Oh
- Department of Anatomy, Inha University School of Medicine, Incheon 22212, Republic of Korea; (S.-I.S.); (D.D.); (S.-A.O.)
| | - Eun-Hwa Lee
- Department of Brain and Cognitive Sciences, Scranton College, Ewha Womans University, Seoul 03760, Republic of Korea; (E.-H.L.); (P.-L.H.)
| | - Pyung-Lim Han
- Department of Brain and Cognitive Sciences, Scranton College, Ewha Womans University, Seoul 03760, Republic of Korea; (E.-H.L.); (P.-L.H.)
- Department of Chemistry and Nano Science, College of Natural Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Seung-Woo Kim
- Department of Biomedical Sciences, Inha University School of Medicine, Inchon 22212, Republic of Korea
| | - Ja-Kyeong Lee
- Department of Anatomy, Inha University School of Medicine, Incheon 22212, Republic of Korea; (S.-I.S.); (D.D.); (S.-A.O.)
| |
Collapse
|
6
|
Tang D, Kang R, Zeh HJ, Lotze MT. The multifunctional protein HMGB1: 50 years of discovery. Nat Rev Immunol 2023; 23:824-841. [PMID: 37322174 DOI: 10.1038/s41577-023-00894-6] [Citation(s) in RCA: 67] [Impact Index Per Article: 67.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2023] [Indexed: 06/17/2023]
Abstract
Fifty years since the initial discovery of HMGB1 in 1973 as a structural protein of chromatin, HMGB1 is now known to regulate diverse biological processes depending on its subcellular or extracellular localization. These functions include promoting DNA damage repair in the nucleus, sensing nucleic acids and inducing innate immune responses and autophagy in the cytosol and binding protein partners in the extracellular environment and stimulating immunoreceptors. In addition, HMGB1 is a broad sensor of cellular stress that balances cell death and survival responses essential for cellular homeostasis and tissue maintenance. HMGB1 is also an important mediator secreted by immune cells that is involved in a range of pathological conditions, including infectious diseases, ischaemia-reperfusion injury, autoimmunity, cardiovascular and neurodegenerative diseases, metabolic disorders and cancer. In this Review, we discuss the signalling mechanisms, cellular functions and clinical relevance of HMGB1 and describe strategies to modify its release and biological activities in the setting of various diseases.
Collapse
Affiliation(s)
- Daolin Tang
- Department of Surgery, UT Southwestern Medical Center, Dallas, TX, USA.
| | - Rui Kang
- Department of Surgery, UT Southwestern Medical Center, Dallas, TX, USA
| | - Herbert J Zeh
- Department of Surgery, UT Southwestern Medical Center, Dallas, TX, USA
| | - Michael T Lotze
- Departments of Surgery, Immunology and Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
| |
Collapse
|
7
|
Larochelle J, Tishko RJ, Yang C, Ge Y, Phan LT, Gunraj RE, Stansbury SM, Liu L, Mohamadzadeh M, Khoshbouei H, Candelario-Jalil E. Receptor-interacting protein kinase 2 (RIPK2) profoundly contributes to post-stroke neuroinflammation and behavioral deficits with microglia as unique perpetrators. J Neuroinflammation 2023; 20:221. [PMID: 37777791 PMCID: PMC10543871 DOI: 10.1186/s12974-023-02907-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Accepted: 09/26/2023] [Indexed: 10/02/2023] Open
Abstract
BACKGROUND Receptor-interacting protein kinase 2 (RIPK2) is a serine/threonine kinase whose activity propagates inflammatory signaling through its association with pattern recognition receptors (PRRs) and subsequent TAK1, NF-κB, and MAPK pathway activation. After stroke, dead and dying cells release a host of damage-associated molecular patterns (DAMPs) that activate PRRs and initiate a robust inflammatory response. We hypothesize that RIPK2 plays a damaging role in the progression of stroke injury by enhancing the neuroinflammatory response to stroke and that global genetic deletion or microglia-specific conditional deletion of Ripk2 will be protective following ischemic stroke. METHODS Adult (3-6 months) male mice were subjected to 45 min of transient middle cerebral artery occlusion (tMCAO) followed by 24 h, 48 h, or 28 days of reperfusion. Aged male and female mice (18-24 months) were subjected to permanent ischemic stroke and sacrificed 48 h later. Infarct volumes were calculated using TTC staining (24-48 h) or Cresyl violet staining (28d). Sensorimotor tests (weight grip, vertical grid, and open field) were performed at indicated timepoints. Blood-brain barrier (BBB) damage, tight junction proteins, matrix metalloproteinase-9 (MMP-9), and neuroinflammatory markers were assessed via immunoblotting, ELISA, immunohistochemistry, and RT-qPCR. Differential gene expression profiles were generated through bulk RNA sequencing and nanoString®. RESULTS Global genetic deletion of Ripk2 resulted in decreased infarct sizes and reduced neuroinflammatory markers 24 h after stroke compared to wild-type controls. Ripk2 global deletion also improved both acute and long-term behavioral outcomes with powerful effects on reducing infarct volume and mortality at 28d post-stroke. Conditional deletion of microglial Ripk2 (mKO) partially recapitulated our results in global Ripk2 deficient mice, showing reductive effects on infarct volume and improved behavioral outcomes within 48 h of injury. Finally, bulk transcriptomic profiling and nanoString data demonstrated that Ripk2 deficiency in microglia decreases genes associated with MAPK and NF-κB signaling, dampening the neuroinflammatory response after stroke injury by reducing immune cell activation and peripheral immune cell invasion. CONCLUSIONS These results reveal a hitherto unknown role for RIPK2 in the pathogenesis of ischemic stroke injury, with microglia playing a distinct role. This study identifies RIPK2 as a potent propagator of neuroinflammatory signaling, highlighting its potential as a therapeutic target for post-stroke intervention.
Collapse
Affiliation(s)
- Jonathan Larochelle
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Ryland J Tishko
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Changjun Yang
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Yong Ge
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health, San Antonio, TX, USA
| | - Leah T Phan
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Rachel E Gunraj
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Sofia M Stansbury
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Lei Liu
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Mansour Mohamadzadeh
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health, San Antonio, TX, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Eduardo Candelario-Jalil
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA.
| |
Collapse
|
8
|
Protective Effects of Sophorae tonkinensis Gagnep. (Fabaceae) Radix et Rhizoma Water Extract on Carbon Tetrachloride-Induced Acute Liver Injury. Molecules 2022; 27:molecules27248650. [PMID: 36557783 PMCID: PMC9780913 DOI: 10.3390/molecules27248650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 12/03/2022] [Accepted: 12/03/2022] [Indexed: 12/12/2022] Open
Abstract
Sophorae tonkinensis Radix et Rhizoma (STR) is a traditional Chinese herbal medicine. STR can reduce aminotransferase activity; however, the specific mechanism remains unclear. Here, we explored the potential therapeutic effects and hepatoprotective mechanism of STR on liver damage in mice. The chemical characteristics of the extract were characterized using ultra-high-performance liquid chromatography-tandem mass spectrometry fingerprinting, and its antioxidant capacity was verified using free radical scavenging tests. Forty-eight Kunming mice were randomly assigned into six groups. The model was made after the corresponding drug was given. The results showed that the STR water extract pretreatment significantly reduced serum aminotransferase and related liver function indicators compared with that in the model group. Furthermore, the STR water extract pretreatment significantly inhibited the apoptosis of liver cells, the level of liver high-mobility group box 1 (HMGB1), and inflammatory factors in hepatic tissue compared with that in the model group, and significantly downregulated the levels of toll-like receptor 4 (TLR4), Myeloid differentiation factor 88 (MyD88), and nuclear factor kappa B (NF-κB) compared with those in the model group. Overall, the STR water extract exerted a significant protective effect on CCL4-induced acute liver injury in this study, and the accurate active ingredients of the STR water extract will be explored in the near future.
Collapse
|