1
|
Katsa ME, Ketselidi K, Kalliostra M, Ioannidis A, Rojas Gil AP, Diamantakos P, Melliou E, Magiatis P, Nomikos T. Acute Antiplatelet Effects of an Oleocanthal-Rich Olive Oil in Type II Diabetic Patients: A Postprandial Study. Int J Mol Sci 2024; 25:908. [PMID: 38255980 PMCID: PMC10815739 DOI: 10.3390/ijms25020908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Revised: 12/30/2023] [Accepted: 01/03/2024] [Indexed: 01/24/2024] Open
Abstract
Postprandial dysmetabolism is a common entity of type 2 diabetes mellitus (T2DM) and may act as a daily stressor of the already dysfunctional diabetic platelets. This study aims to investigate whether oleocanthal-rich olive oils (OO), incorporated into a carbohydrate-rich meal, can affect postprandial dysmetabolism and platelet aggregation. Oleocanthal is a cyclooxygenase inhibitor with putative antiplatelet properties. In this randomized, single-blinded, crossover study, ten T2DM patients consumed five isocaloric meals containing 120 g white bread combined with: (i) 39 g butter, (ii) 39 g butter and 400 mg ibuprofen, (iii) 40 mL OO (phenolic content < 10 mg/Kg), (iv) 40 mL OO with 250 mg/Kg oleocanthal and (v) 40 mL OO with 500 mg/Kg oleocanthal. Metabolic markers along with ex vivo ADP- and thrombin receptor-activating peptide (TRAP)-induced platelet aggregation were measured before and for 4 h after the meals. The glycemic and lipidemic response was similar between meals. However, a sustained (90-240 min) dose-dependent reduction in platelets' sensitivity to both ADP (50-100%) and TRAP (20-50%) was observed after the oleocanthal meals in comparison to OO or butter meals. The antiplatelet effect of the OO containing 500 mg/Kg oleocanthal was comparable to that of the ibuprofen meal. In conclusion, the consumption of meals containing oleocanthal-rich OO can reduce platelet activity during the postprandial period, irrespective of postprandial hyperglycemia and lipidemia.
Collapse
Affiliation(s)
- Maria Efthymia Katsa
- Department of Nutrition and Dietetics, School of Health Sciences and Education, Harokopio University of Athens, GR-17676 Athens, Greece; (M.E.K.); (K.K.); (M.K.)
| | - Kleopatra Ketselidi
- Department of Nutrition and Dietetics, School of Health Sciences and Education, Harokopio University of Athens, GR-17676 Athens, Greece; (M.E.K.); (K.K.); (M.K.)
| | - Marianna Kalliostra
- Department of Nutrition and Dietetics, School of Health Sciences and Education, Harokopio University of Athens, GR-17676 Athens, Greece; (M.E.K.); (K.K.); (M.K.)
| | - Anastasios Ioannidis
- Laboratory of Biology and Biochemistry, Department of Nursing, Faculty of Health Sciences, University of Peloponnese, GR-22100 Tripoli, Greece; (A.I.); (A.P.R.G.)
| | - Andrea Paola Rojas Gil
- Laboratory of Biology and Biochemistry, Department of Nursing, Faculty of Health Sciences, University of Peloponnese, GR-22100 Tripoli, Greece; (A.I.); (A.P.R.G.)
| | - Panagiotis Diamantakos
- Laboratory of Pharmacognosy and Natural Products Chemistry, Department of Pharmacy, National and Kapodistrian University of Athens, GR-15774 Athens, Greece; (P.D.); (E.M.); (P.M.)
| | - Eleni Melliou
- Laboratory of Pharmacognosy and Natural Products Chemistry, Department of Pharmacy, National and Kapodistrian University of Athens, GR-15774 Athens, Greece; (P.D.); (E.M.); (P.M.)
| | - Prokopios Magiatis
- Laboratory of Pharmacognosy and Natural Products Chemistry, Department of Pharmacy, National and Kapodistrian University of Athens, GR-15774 Athens, Greece; (P.D.); (E.M.); (P.M.)
| | - Tzortzis Nomikos
- Department of Nutrition and Dietetics, School of Health Sciences and Education, Harokopio University of Athens, GR-17676 Athens, Greece; (M.E.K.); (K.K.); (M.K.)
| |
Collapse
|
2
|
Wang L, Liang C, Lin X, Liu C, Li J. microRNA-491-5p regulates osteogenic differentiation of bone marrow stem cells in type 2 diabetes. Oral Dis 2021; 29:308-321. [PMID: 34618998 DOI: 10.1111/odi.14005] [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: 04/21/2021] [Revised: 08/04/2021] [Accepted: 08/10/2021] [Indexed: 11/28/2022]
Abstract
OBJECTIVES Osseointegration of oral implants has a low success rate in patients with type 2 diabetes. This is because of the inhibition of osteogenic differentiation in the jawbone marrow mesenchymal stem cells, in which the expression of microRNA(miR)-491-5p is significantly downregulated, as ascertained through gene chip screening. However, the underlying mechanisms are unclear. Here, we aimed to clarify the mechanisms involved in the influence of miR-491-5p on osteogenic differentiation. SUBJECTS AND METHODS Jawbone marrow mesenchymal stem cells were isolated from jawbones of patients with type 2 diabetes and subjected to bioinformatics and functional analyses. Osteogenesis experiments were conducted using the isolated cells and an in vivo model. RESULTS Knockdown and overexpression experiments revealed the positive effects of miR-491-5p expression on osteogenic differentiation in vivo and in vitro. Additionally, a dual-luciferase assay revealed that miR-491-5p targeted the SMAD/RUNX2 pathway by inhibiting the expression of epidermal growth factor receptor. CONCLUSIONS miR-491-5p is vital in osteogenic differentiation of jawbone mesenchymal stem cells; its downregulation in type 2 diabetes could be a major cause of decreased osteogenic differentiation. Regulation of miR-491-5p expression could improve osteogenic differentiation of jawbone mesenchymal stem cells in patients with type 2 diabetes.
Collapse
Affiliation(s)
- Lingxiao Wang
- Department of Dental Implant Centre, Beijing Stomatological Hospital, Capital Medical University, Capital Medical University School of Stomatology, Beijing, China
| | - Chao Liang
- Department of Dental Implant Centre, Beijing Stomatological Hospital, Capital Medical University, Capital Medical University School of Stomatology, Beijing, China
| | - Xiao Lin
- Department of Dental Implant Centre, Beijing Stomatological Hospital, Capital Medical University, Capital Medical University School of Stomatology, Beijing, China
| | - Changying Liu
- Department of Dental Implant Centre, Beijing Stomatological Hospital, Capital Medical University, Capital Medical University School of Stomatology, Beijing, China
| | - Jun Li
- Department of Dental Implant Centre, Beijing Stomatological Hospital, Capital Medical University, Capital Medical University School of Stomatology, Beijing, China.,Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China
| |
Collapse
|
3
|
Functional role of TRPC6 and STIM2 in cytosolic and endoplasmic reticulum Ca2+ content in resting estrogen receptor-positive breast cancer cells. Biochem J 2021; 477:3183-3197. [PMID: 32794568 DOI: 10.1042/bcj20200560] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/07/2020] [Accepted: 08/14/2020] [Indexed: 12/11/2022]
Abstract
TRPC6 forms non-selective cation channels activated by a variety of stimuli that are involved in a wide number of cellular functions. In estrogen receptor-positive (ER+) breast cancer cells, the store-operated Ca2+ entry has been reported to be dependent on STIM1, STIM2 and Orai3, with TRPC6 playing a key role in the activation of store-operated Ca2+ entry as well as in proliferation, migration and viability of breast cancer cells. We have used a combination of biotinylation, Ca2+ imaging as well as protein knockdown and overexpression of a dominant-negative TRPC6 mutant (TRPC6dn) to show that TRPC6 and STIM2 are required for the maintenance of cytosolic and endoplasmic reticulum Ca2+ content under resting conditions in ER+ breast cancer MCF7 cells. These cells exhibit a greater plasma membrane expression of TRPC6 under resting conditions than non-tumoral breast epithelial cells. Attenuation of STIM2, TRPC6 and Orai3, alone or in combination, results in impairment of resting cytosolic and endoplasmic reticulum Ca2+ homeostasis. Similar results were observed when cells were transfected with expression plasmid for TRPC6dn. TRPC6 co-immunoprecipitates with STIM2 in resting MCF7 cells, a process that is impaired by rises in cytosolic Ca2+ concentration. Impairment of TRPC6 function leads to abnormal Ca2+ homeostasis and endoplasmic reticulum stress, thus, suggesting that TRPC6 might be a potential target for the development of anti-tumoral therapies.
Collapse
|
4
|
Li J, Wang Y, Li H, Zuo Z, Lin J, Wang A, Zhao X, Liu L, Wang Y. Homocysteine Level Predicts Response to Dual Antiplatelet in Women With Minor Stroke or Transient Ischemic Attack: Subanalysis of the CHANCE Trial. Arterioscler Thromb Vasc Biol 2020; 40:839-846. [PMID: 31941381 DOI: 10.1161/atvbaha.119.313741] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVES To investigate the relationship of homocysteine levels with the efficacy and safety of dual antiplatelet therapy in female and male patients. Approach and Results: The CHANCE trial (Clopidogrel in High-Risk Patients With Acute Nondisabling Cerebrovascular Events) randomized patients with acute minor ischemic stroke or high-risk transient ischemic attack to clopidogrel plus aspirin or aspirin alone from October 1, 2009, to July 30, 2012, in China. A subgroup of 3044 consecutive patients with baseline homocysteine levels from 73 (64%) prespecified clinical sites was analyzed. Participants were grouped by sex. Primary outcome was stroke recurrence within 90 days. Secondary outcomes consisted of composite vascular events and independent living or death. Safety outcome was any bleeding. Cox proportional-hazards models were used to assess the interaction of homocysteine levels with randomized antiplatelet therapy on efficacy and safety outcomes. A significant interaction between homocysteine levels and the randomized antiplatelet therapies was found on recurrent stroke after adjustment for confounding factors in women (P=0.010) but not in men (P=0.595). Compared with aspirin alone, clopidogrel plus aspirin significantly reduced the risk of recurrent stroke in women without elevated homocysteine levels (adjusted hazard ratio, 0.459 [95% CI, 0.271-0.776]; P=0.004). Such benefit disappeared in female patients with increased homocysteine level. No significant interaction on functional outcome or bleeding rate was observed. CONCLUSIONS Homocysteine could be a potential biomarker to discriminate the effects of dual and single antiplatelet therapy in female patients with minor ischemic stroke or high-risk transient ischemic attack. CLINICAL TRIAL REGISTRATION URL: http://www.clinicaltrials.gov. Unique identifier: NCT00979589.
Collapse
Affiliation(s)
- Jiejie Li
- From the Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,China National Clinical Research Center for Neurological Diseases, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Center of Stroke, Beijing Institute for Brain Disorders, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang)
| | - Yilong Wang
- From the Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Center of Stroke, Beijing Institute for Brain Disorders, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang)
| | - Hao Li
- From the Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Center of Stroke, Beijing Institute for Brain Disorders, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang)
| | - Zhiyi Zuo
- Department of Anesthesiology, University of Virginia Health System, Charlottesville (Z.Z.)
| | - Jinxi Lin
- From the Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Center of Stroke, Beijing Institute for Brain Disorders, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang)
| | - Anxin Wang
- China National Clinical Research Center for Neurological Diseases, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Center of Stroke, Beijing Institute for Brain Disorders, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang)
| | - Xingquan Zhao
- China National Clinical Research Center for Neurological Diseases, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Center of Stroke, Beijing Institute for Brain Disorders, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang)
| | - Liping Liu
- China National Clinical Research Center for Neurological Diseases, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Center of Stroke, Beijing Institute for Brain Disorders, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang)
| | - Yongjun Wang
- From the Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,China National Clinical Research Center for Neurological Diseases, Beijing, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Center of Stroke, Beijing Institute for Brain Disorders, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang).,Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, China (J. Li, Yilong Wang., H.L., J. Lin, A.W., X.Z., L.L., Yongjun Wang)
| | | |
Collapse
|
5
|
Kaur L, Garg PR, Ghosh PK, Saraswathy KN. Impaired Homocysteine Metabolism Associated with High Plasma Interleukin-17A Levels, a Pro-Atherogenic Marker, in an Endogamous Population of North India. Ethn Dis 2018; 28:525-530. [PMID: 30405296 PMCID: PMC6200300 DOI: 10.18865/ed.28.4.525] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Background Impaired homocysteine metabolism (IHM; hyperhomocysteinemia) has been linked with many complex disorders like cardiovascular diseases and immunological disturbances. However, studies understanding IHM in light of pro- and anti- atherogeneic markers like Interleukin-17A & -10 (IL-17A & IL-10) and Forkhead box p3 (Foxp3, a master transcription factor) are scarce. Aim In our present study, we aimed to understand the relation of IHM with plasma IL-17A and IL-10 levels and Foxp3 mRNA expression in peripheral blood mononuclear cells (PBMCs) from an endogamous population (Jats of Haryana, North India) with high prevalence of IHM without the concurrence of significant adverse cardiovascular outcomes. Methods Forty (40) clinically healthy individuals, unrelated up to first cousins, were recruited and were subjected to demographic, physiological and anthropometric profiling, followed by intravenous blood sample collection (fasting) and lipid profiling. Plasma homocysteine levels were estimated and individuals with homocysteine levels ≥ 15umol/L and <15umol/L were categorized as the impaired homocysteine metabolism group (IHM, n=30) and normal homocysteine metabolism group (NHM, n=10) respectively. Plasma folate and vitamin B12 and MTHFR C677T (methylenetetrahydrofolate reductase) polymorphism were detected. Relative mRNA expression of Foxp3 in PBMCs (normalized to 18S) was quantitated using SyBR green technology. Plasma IL-10 & 17 levels were estimated by ELISA assays. Results and Conclusions None of the physiological, anthropometric and lipid variables were different between the two groups. Foxp3 mRNA expression levels were relatively lower, and plasma IL-10 levels were found to be comparable among IHM and NHM group. However, significantly higher IL-17A levels and relatively high LDL cholesterol levels were present in the IHM group as compared with NHM. Our findings suggest that the Jats of Haryana, North India, exhibiting high levels of homocysteine, might also carry the high IL-17A -pro-atherogenic marker, suggesting an increasing burden of pre-morbid condition. This apparently does not reach to significant mortality/morbidity attributed to the counter action or balancing act of IL-10 (an anti-atherogenic marker). This further suggests environment-influenced epigenetic control mechanisms of the targeted genes in the present population.
Collapse
Affiliation(s)
- Lovejeet Kaur
- Department of Anthropology, University of Delhi, India
- Genomic Research on Complex Diseases (GRC) Group, CSIR-Centre for Cellular and Molecular Biology, Habsiguda, Uppal Road, Hyderabad, Telangana-500007, India
| | - Priyanka Rani Garg
- Department of Anthropology, University of Delhi, India
- Public Health Foundation of India, New Delhi, Delhi, India
| | | | | |
Collapse
|
6
|
Romecín P, Atucha NM, Navarro EG, Ortiz MC, Iyú D, Rosado JA, García-Estañ J. Role of homocysteine and folic acid on the altered calcium homeostasis of platelets from rats with biliary cirrhosis. Platelets 2017; 28:698-705. [PMID: 28150525 DOI: 10.1080/09537104.2016.1265920] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Previously, we have found that intracellular calcium homeostasis is altered in platelets from an experimental model of liver cirrhosis, the bile-duct ligated (BDL) rat; these alterations are compatible with the existence of a hypercoagulable state. Different studies indicate that cholestatic diseases are associated with hyperhomocysteinemia; thus, we hypothetized that it could contribute to those platelet alterations. In the present study, we have investigated the role of homocysteine (HCY) in platelet aggregation and calcium signaling in the BDL model. The effect of chronic folic acid treatment was also analyzed. Acute treatment with HCY increased the aggregation response to ADP and calcium responses to thrombin in platelets of control and BDL rats. Capacitative calcium entry was not altered by HCY. Chronic treatment with folic acid decreased platelet aggregation in control and BDL rats, but this decrease was greater in BDL rats. In folic acid-treated rats, thrombin-induced calcium entry and release were decreased in platelet of control rats but unaltered in BDL rats; however, capacitative calcium entry was decreased in platelets of control and BDL rats treated with folic acid. Reactive oxygen species were produced at higher levels by BDL platelets after stimulation with HCY or thrombin and folic acid normalized these responses. HCY plays a role in the enhanced platelet aggregation response of BDL rats, probably through an enhanced formation of ROS. Folic acid pretreatment normalizes many of the platelet alterations shown by BDL rats.
Collapse
Affiliation(s)
- Paola Romecín
- a Depto. Fisiología, Fac. Medicina, Instituto Murciano de Investigación Biosanitaria (IMIB) , Universidad de Murcia, Murcia, Spain
| | - Noemí M Atucha
- a Depto. Fisiología, Fac. Medicina, Instituto Murciano de Investigación Biosanitaria (IMIB) , Universidad de Murcia, Murcia, Spain
| | - Esther G Navarro
- a Depto. Fisiología, Fac. Medicina, Instituto Murciano de Investigación Biosanitaria (IMIB) , Universidad de Murcia, Murcia, Spain
| | - M Clara Ortiz
- a Depto. Fisiología, Fac. Medicina, Instituto Murciano de Investigación Biosanitaria (IMIB) , Universidad de Murcia, Murcia, Spain
| | - David Iyú
- a Depto. Fisiología, Fac. Medicina, Instituto Murciano de Investigación Biosanitaria (IMIB) , Universidad de Murcia, Murcia, Spain
| | - Juan Antonio Rosado
- b Depto. Fisiología, Fac. Veterinaria , Universidad de Extremadura , Cáceres, Spain
| | - Joaquín García-Estañ
- a Depto. Fisiología, Fac. Medicina, Instituto Murciano de Investigación Biosanitaria (IMIB) , Universidad de Murcia, Murcia, Spain
| |
Collapse
|
7
|
Alihosseini N, Moahboob SA, Farrin N, Mobasseri M, Taghizadeh A, Ostadrahimi AR. EFFECT OF PROBIOTIC FERMENTED MILK (KEFIR) ON SERUM LEVEL OF INSULIN AND HOMOCYSTEINE IN TYPE 2 DIABETES PATIENTS. ACTA ENDOCRINOLOGICA-BUCHAREST 2017; 13:431-436. [PMID: 31149212 DOI: 10.4183/aeb.2017.431] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Background Probiotic fermented milk is one of the most beneficial foods. The main purpose of this study was to investigate the effect of probiotic fermented milk on the serum level of insulin and homocysteine in the type 2 diabetes patients. Methods This study was done in 60 patients with type 2 diabetes. The intervention group received 600 mL of probiotic fermented milk (kefir) daily and control group received 600 mL of conventional fermented milk daily for 8 weeks. Food intake, anthropometric indices, serum parameters were assessed at the beginning and at the end of the study. The statistical analysis was done by the use of SPSS software (Ver.13). Results The mean of serum insulin level did not reduce significantly after the intervention in probiotic fermented milk group, and there was no significant difference between the two groups. The mean of HOMA-IR decreased significantly in probiotic fermented milk group after intervention and there was a significant difference between the two groups after intervention. The mean of quickie increased in probiotic fermented milk group, but this increase was not significant. Also, there was not significant difference between the two groups after intervention. The mean of homocysteine level decresead significantly in patients with probiotic fermented milk and conventional fermented milk consumption. Conclusions By considering the effect of probiotic fermented milk on some risk factors of cardiovascular disease in diabetic patients, probiotic foods may be useful as an adjuvant therapy in diabetic patients.
Collapse
Affiliation(s)
- N Alihosseini
- Higher Education Institute of Rabe-Rashidi, Tabriz, Islamic Republic of Iran
| | - S A Moahboob
- Nurtition Research Center, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran
| | - N Farrin
- Nurtition Research Center, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran
| | - M Mobasseri
- Endocrinology Research Center, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran
| | - A Taghizadeh
- School of Agriculture, University of Tabriz, Tabriz, Islamic Republic of Iran
| | - A R Ostadrahimi
- Nurtition Research Center, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran
| |
Collapse
|
8
|
Alexandru N, Badila E, Weiss E, Cochior D, Stępień E, Georgescu A. Vascular complications in diabetes: Microparticles and microparticle associated microRNAs as active players. Biochem Biophys Res Commun 2016; 472:1-10. [DOI: 10.1016/j.bbrc.2016.02.038] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 02/10/2016] [Indexed: 12/23/2022]
|
9
|
Lopez E, Berna-Erro A, Salido GM, Rosado JA, Redondo PC. FKBP25 and FKBP38 regulate non-capacitative calcium entry through TRPC6. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:2684-96. [PMID: 26239116 DOI: 10.1016/j.bbamcr.2015.07.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Revised: 07/27/2015] [Accepted: 07/30/2015] [Indexed: 10/23/2022]
Abstract
Non-capacitative calcium entry (NCCE) contributes to cell activation in response to the occupation of G protein-coupled membrane receptors. Thrombin administration to platelets evokes the synthesis of diacylglycerol downstream of PAR receptor activation. Diacylglycerol evokes NCCE through activating TRPC3 and TRPC6 in human platelets. Although it is known that immunophilins interact with TRPCs, the role of immunophilins in the regulation of NCCE remains unknown. Platelet incubation with FK506, an immunophilin antagonist, reduced OAG-evoked NCCE in a concentration-dependent manner, an effect that was independent on the inactivation of calcineurin (CaN). FK506 was unable to reduce NCCE evoked by OAG in platelets from TRPC6-/- mice. In HEK-293 cells overexpressing TRPC6, currents through TRPC6 were altered in the presence of FK506. We have found interaction between FKBP38 and other FKBPs, like FKBP25, FKBP12, and FKBP52 that were not affected by FK506, as well as with calmodulin (CaM). FK506 modified the pattern of association between FKBP25 and TRPCs as well as impaired OAG-evoked TRPC3 and TRPC6 coupling in both human and mouse platelets. By performing biotinylation experiments we have elucidated that FKBP25 and FKBP38 might be found at different cellular location, the plasma membrane and the already described intracellular locations. Finally, FKBP25 and FKBP38 silencing significantly inhibits OAG-evoked NCCE in MEG-01 and HEK293 cells, while overexpression of FKBP38 does not modify NCCE in HEK293 cells. All together, these findings provide strong evidence for a role of immunophilins, including FKBP25 and FKBP38, in NCCE mediated by TRPC6.
Collapse
Affiliation(s)
- Esther Lopez
- Department of Physiology, Cell Physiology Research Group, University of Extremadura, 10003 Cáceres, Spain
| | - Alejandro Berna-Erro
- Department of Physiology, Cell Physiology Research Group, University of Extremadura, 10003 Cáceres, Spain
| | - Gines M Salido
- Department of Physiology, Cell Physiology Research Group, University of Extremadura, 10003 Cáceres, Spain
| | - Juan A Rosado
- Department of Physiology, Cell Physiology Research Group, University of Extremadura, 10003 Cáceres, Spain
| | - Pedro C Redondo
- Department of Physiology, Cell Physiology Research Group, University of Extremadura, 10003 Cáceres, Spain.
| |
Collapse
|
10
|
Evaluation of the antiaggregant activity of ascorbyl phenolic esters with antioxidant properties. J Physiol Biochem 2015; 71:415-34. [PMID: 26081024 DOI: 10.1007/s13105-015-0421-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 06/04/2015] [Indexed: 02/02/2023]
Abstract
Beneficial effects of the antioxidant L-ascorbic acid (Asc) in human health are well known. Its particular role in hemostasis deserves further consideration, since it has been described a dose-dependent effect of Asc in platelet activity. Contrary, it has been demonstrated that phenolic compounds have inhibitory effects on platelet aggregation stimulated by the physiological agonist thrombin (Thr). Here, we have evaluated the actions of three synthetic phenolic esters of Asc: L-ascorbyl 6-protocatechuate (Prot Asc), L-ascorbyl 6-gallate (Gal Asc), and L-ascorbyl 6-caffeate (Caf Asc). All these Asc derivatives exhibited greater radical scavenging activity than Asc, and in experiments using human platelets from healthy subjects, they do not evoke changes in platelet viability upon their administration. Nevertheless, these compounds altered platelet calcium homeostasis in response to Thr, although Prot Asc induced a smaller effect than Gal Asc, Caf Asc, and Asc. As a consequence, platelet aggregation was also impaired by these compounds, reporting Prot Asc and Caf Asc a weaker antiaggregant action than Gal Asc and Asc. Treatments with Gal Asc and Caf Asc altered in larger extent the phosphorylation pattern of pp60(Src) and mammalian target of rapamycin (mTOR) evoked by stimulating human platelets with Thr. Summarizing, Prot Asc is the ascorbyl phenolic ester with the strongest antioxidant properties and weakest antiaggregant actions, and its use as antioxidant may be safer than the rest of derivatives in order to prevent thrombotic alteration in patients that need treatment with antioxidant therapies.
Collapse
|
11
|
Dayer MR, Mard-Soltani M, Dayer MS, Alavi SMR. Causality relationships between coagulation factors in type 2 diabetes mellitus: path analysis approach. Med J Islam Repub Iran 2014; 28:59. [PMID: 25405125 PMCID: PMC4219888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Accepted: 12/17/2013] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Type 2 diabetic mellitus patients are amongst the most susceptible groups to vascular abnormalities, which predominantly lead to myocardial disease. The hypercoagulable state has been widely studied by researchers as being the major suspicious mechanism facilitating the consecutive chain of molecular events leading to these complications. However, there is no consensus on the definition of the hypercoagulable state with respect to coagulation quantities, their interrelations and basic factor(s) initiating this pathogenic event, by which the prognosis of myocardial complications could be determined. METHODS Path analysis was used to study the interactions between coagulation factors as well as other factors beyond coagulation factors in relation with pathogenic events in both diabetics and healthy subjects. In the present work, coagulation factors of 40 healthy and 40 type 2 diabetics were determined experimentally. The data were then analyzed using SPSS and AMOS software. Multivariate regression analysis was done to draw path diagrams. RESULTS Our results show that FII, as the main cause for hypercoagulable state, is directly induced by FX and FVIII in normal individuals and by FX, FXI, FV and VWF cofactors in diabetic patients. CONCLUSION In general, our findings showed complicated relationship between coagulation factors and their effects either separately or combined.
Collapse
Affiliation(s)
- Mohammad Reza Dayer
- 1. Assistant Professor, Department of Biology, Faculty of Science, Shahid Chamran University, Ahvaz, Iran.
| | - Maysam Mard-Soltani
- 2. Medical Education Development Center, Dezful University of Medical Sciences, Dezful, Iran.
| | - Mohammad Saaid Dayer
- 3. Assistant Professor, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
| | - Sayed Mohammad Reza Alavi
- 4. Assistant Professor, Department of Statistics, Faculty of Mathematics and Computer Sciences, Shahid Chamran University, Ahvaz, Iran.
| |
Collapse
|
12
|
Karolczak K, Kamysz W, Karafova A, Drzewoski J, Watala C. Homocysteine is a novel risk factor for suboptimal response of blood platelets to acetylsalicylic acid in coronary artery disease: A randomized multicenter study. Pharmacol Res 2013; 74:7-22. [DOI: 10.1016/j.phrs.2013.04.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Revised: 04/24/2013] [Accepted: 04/25/2013] [Indexed: 12/29/2022]
|
13
|
Wu S, Gao X, Yang S, Liu L, Ge B, Yang Q. Protective Effects of Cariporide on Endothelial Dysfunction Induced by Homocysteine. Pharmacology 2013; 92:303-9. [DOI: 10.1159/000356318] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Accepted: 10/09/2013] [Indexed: 11/19/2022]
|
14
|
Alexandru N, Popov D, Georgescu A. Platelet dysfunction in vascular pathologies and how can it be treated. Thromb Res 2011; 129:116-26. [PMID: 22035630 DOI: 10.1016/j.thromres.2011.09.026] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Revised: 09/19/2011] [Accepted: 09/22/2011] [Indexed: 12/17/2022]
Abstract
Cardiovascular diseases are one of the leading causes of morbidity and mortality in industrialized countries, and although many processes play a role in the development of vascular disease, thrombosis is the primary event that precipitates stroke and acute coronary syndromes. The blood platelets are of significant importance in medicine. These cells are involved in many physiological processes, particularly haemostasis through their ability to aggregate and form clots in response to activation. In addition, these dynamic cells display activities that extend beyond thrombosis, including an important role in initiating and sustaining vascular inflammation. The expansion of knowledge from basic and clinical research has highlighted the critical position of platelets in several inflammatory diseases such as arthritis and atherosclerosis. Platelets are emerging as important mediators of inflammation and provide important signals to mediate phenotype of other blood and vascular cells. The important role of platelets in arterial thrombosis and the onset of acute myocardial infarction after atherosclerotic plaque rupture make inhibition of platelet aggregation a critical step in preventing thrombotic events associated with stroke, heart attack, and peripheral arterial thrombosis. However, the use of platelet inhibitors for thrombosis prevention must seek a delicate balance between inhibiting platelet activation and an associated increased bleeding risk. The aim of this review is to up-date the knowledge on platelets physiology and dysfunction in pathologies, such as diabetes mellitus, hypercholesterolemia, and hypertension, emphasizing the link between platelets and the inflammation-related atherosclerosis. The review evaluates the opportunities offered by the novel platelet inhibitors to efficiently alleviate the thrombotic events.
Collapse
|
15
|
Jardín I, López JJ, Zbidi H, Bartegi A, Salido GM, Rosado JA. Attenuated store-operated divalent cation entry and association between STIM1, Orai1, hTRPC1 and hTRPC6 in platelets from type 2 diabetic patients. Blood Cells Mol Dis 2011; 46:252-60. [PMID: 21303733 DOI: 10.1016/j.bcmd.2010.12.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Revised: 11/08/2010] [Accepted: 12/20/2010] [Indexed: 12/11/2022]
Abstract
Agonist-evoked Ca(2+) entry has been reported to be enhanced in platelets from type 2 diabetic patients, which results in altered platelet responsiveness and cardiovascular complications. The present study is aimed to investigate whether store-operated divalent cation entry, a major Ca(2+) entry pathway, is altered in platelets from diabetic patients. Store-operated divalent cation entry was estimated by determination of Mn(2+) entry. Association between STIM1, Orai1, hTRPC1 and hTRPC6 was detected by co-immunoprecipitation and Western blotting. In the presence of specific purinergic and serotoninergic receptor antagonists Mn(2+) entry, induced by thapsigargin (TG), was reduced in platelets from diabetic donors as compared to healthy controls. Treatment with TG or the agonist thrombin enhanced co-immunoprecipitation of STIM1 with Orai1, hTRPC1 and hTRPC6 in platelets from healthy donors, a response that was significantly reduced in platelets from diabetic patients. Our results indicate that store-operated divalent cation entry is reduced in platelets from type 2 diabetic subjects, which is likely mediated by impairment of the association of STIM1 with the channel subunits Orai1, hTRPC1 and hTRPC6 and might be involved in the pathogenesis of the altered platelet responsiveness observed in diabetic patients.
Collapse
Affiliation(s)
- Isaac Jardín
- Department of Physiology, Cell Physiology Research Group, University of Extremadura, Cáceres. Spain
| | | | | | | | | | | |
Collapse
|
16
|
Zbidi H, Jardin I, Bartegi A, Salido GM, Rosado JA. Ca2+ leakage rate from agonist-sensitive intracellular pools is altered in platelets from patients with type 2 diabetes. Platelets 2011; 22:284-93. [PMID: 21526890 DOI: 10.3109/09537104.2010.528813] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Platelets from patients with type 2 diabetes show abnormalities in intracellular Ca(2+) homeostasis that are involved in platelet hyperaggregability and the development of thrombotic complications. Different Ca(2+) transport mechanisms have been reported to be altered in platelets from patients with type 2 diabetes, including the sarcoendoplasmic and plasma membrane Ca(2+)-ATPases, plasma membrane Ca(2+) channels, or the Na(+)/Ca(2+) exchanger. Here, we have investigated whether passive Ca(2+) leak from the stores is altered in platelets from patients with type 2 diabetes. Resting cytosolic Ca(2+) concentration ([Ca(2+)](i)) was found to be greater in platelets from patients with type 2 diabetes than in healthy controls. In a Ca(2+)-free medium, platelet stimulation with thrombin or ADP evokes a rapid and transient increase in [Ca(2+)](i) that was found to be greater in patients with diabetes than in healthy controls. Sequential or combined inhibition of Ca(2+) extrusion and Ca(2+) sequestration into the stores reduced the difference between the responses to agonists in patients with diabetes and healthy controls, although agonist-induced Ca(2+) efflux from the stores was still significantly greater in patients with diabetes. Ca(2+) leak from the dense tubular system or the acidic stores, induced by a low concentration of thapsigargin or 2,5-di-(t-butyl)-1,4-hydroquinone (TBHQ), respectively, was clearly greater in patients with diabetes than in controls, and was not significantly modified by treatment with 2-APB. These findings indicate that passive Ca(2+) leakage rate from the intracellular stores in platelets is significantly enhanced in patients with type 2 diabetes mellitus and this might explain the increased resting [Ca(2+)](i).
Collapse
Affiliation(s)
- Hanene Zbidi
- Unité de Recherche de Biochimie, Institute Supérieur de Biotechnologie, 5019-Monastir, Tunisia
| | | | | | | | | |
Collapse
|
17
|
Wald DS, Morris JK, Wald NJ. Reconciling the evidence on serum homocysteine and ischaemic heart disease: a meta-analysis. PLoS One 2011; 6:e16473. [PMID: 21311765 PMCID: PMC3032783 DOI: 10.1371/journal.pone.0016473] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2010] [Accepted: 12/17/2010] [Indexed: 11/18/2022] Open
Abstract
Background Results from genetic epidemiological studies suggest that raised serum homocysteine is a cause of ischaemic heart disease, but the results of randomised trials suggest otherwise. We aimed to update meta-analyses on each type of study using the latest published data and test a hypothesis based on antiplatelet therapy use in the trials to explain the discrepancy. Methods and Findings Meta-analyses of ischaemic heart disease using (i) 75 studies in which the prevalence of a mutation (CT) in the MTHFR gene (which increases homocysteine) was determined in cases (22,068) and controls (23,618), and (ii) 14 randomised trials (39,597 participants) of homocysteine lowering and ischaemic heart disease events. The summary estimates from the two analyses were compared. Meta-analysis of the MTHFR studies showed a statistically significantly increased risk of ischaemic heart disease in TT compared with CC homozygotes; odds ratio 1.16 (1.04 to 1.29) for a 1.9 µmol/L homocysteine difference (TT minus CC). Meta-analysis of randomised trials showed no significant reduction in IHD risk from folic acid; relative risk 1.00 (0.93 to 1.08), despite a reduction in homocysteine of 3.3 µmol/L. There was a statistically significant difference in risk reduction between the 5 trials with the lowest prevalence of antiplatelet therapy (60% on average, usually aspirin), RR 0.93 (0.84 to 1.05) and the 5 trials with the highest prevalence (91% on average), RR 1.09 (1.00 to 1.19), p = 0.037 for the difference. Conclusion Discordant results from MTHFR studies and randomised trials could be explained by aspirin reducing or negating the anti-platelet effect of lowering homocysteine. On this basis, folic acid would have a role in the primary prevention of ischaemic heart disease, when aspirin is not taken routinely, but not in secondary prevention, when it is routine.
Collapse
Affiliation(s)
- David S Wald
- Wolfson Institute of Preventive Medicine, Barts and the London School of Medicine, Queen Mary University of London, London, United Kingdom.
| | | | | |
Collapse
|
18
|
Dominguez-Rodriguez A, Abreu-Gonzalez P, Jimenez-Sosa A, Avanzas P, Bosa-Ojeda F, Kaski JC. Usefulness of intraplatelet melatonin levels to predict angiographic no-reflow after primary percutaneous coronary intervention in patients with ST-segment elevation myocardial infarction. Am J Cardiol 2010; 106:1540-4. [PMID: 21094352 DOI: 10.1016/j.amjcard.2010.07.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2010] [Revised: 07/21/2010] [Accepted: 07/21/2010] [Indexed: 10/18/2022]
Abstract
Platelet aggregates appear to have a pathogenic role in the no-reflow phenomenon, which is associated with impaired clinical outcome in patients with ST-segment elevation myocardial infarction (STEMI). Melatonin, a hormone that plays a major role in biological circadian rhythms, is present in human platelets. Lowered circulating melatonin levels predict poor outcome in patients with STEMI undergoing primary percutaneous coronary intervention (PPCI). We investigated whether intraplatelet melatonin levels correlate with angiographic no-reflow after PPCI in patients with STEMI. We studied 180 consecutive patients with a first STEMI who underwent PPCI within 6 hours from onset of symptoms. Intraplatelet melatonin levels were measured in platelet-rich plasma using an enzymatic immunoassay method. After PPCI, angiographic no-reflow (defined as Thrombolysis In Myocardial Infarction grade < 2 flow) was observed in 63 patients (35%). Patients with angiographic no-reflow had lower intraplatelet melatonin levels compared to patients without no-reflow (12.32 ± 3.64 vs 18.62 ± 3.88 ng/100,000 platelets, p < 0.0001). After adjusting by potential confounders, binary logistic regression analysis showed that intraplatelet melatonin levels were the only significant predictor of angiographic no-reflow (odds ratio 1.58, 95% confidence interval 1.37 to 1.82, p < 0.0001). In conclusion, low intraplatelet melatonin concentration predicts angiographic no-reflow after PPCI in patients with STEMI.
Collapse
|
19
|
Regodón S, del Prado Míguez M, Jardín I, López JJ, Ramos A, Paredes SD, Rosado JA. Melatonin, as an adjuvant-like agent, enhances platelet responsiveness. J Pineal Res 2009; 46:275-85. [PMID: 19196436 DOI: 10.1111/j.1600-079x.2008.00658.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Melatonin exerts immunomodulatory actions that enhance the magnitude and quality of immune responses specific for certain antigens; this has raised the possibility of using melatonin to design novel vaccine adjuvant systems. The present study investigated the effect of subcutaneous slow-release melatonin implants and subcutaneous melatonin injections on the responsiveness of circulating platelets in sheep after vaccination against Dichelobacter nodosus (A1 and C serotypes), the bacterium that causes ovine footrot, a major cause of lameness in sheep. The experiments were carried out in sheep from a farm located in an area of Mediterranean-type ecosystem. Plasma melatonin levels were determined by radioimmunoassay, sheep platelet aggregation was monitored using an aggregometer and Ca2+ mobilization was determined by spectrofluorimetry using fura-2. Administration of melatonin either by implants or subcutaneous injections increased plasma melatonin concentrations, an effect that was found to be greater and more sustained when melatonin was administered via implants. Vaccination per se, as well as melatonin, increased the percentage and rate of platelet aggregation and reduced the lag-time in response to the physiological agonist thrombin, an effect that was found to be significantly greater when melatonin was administered to vaccinated animals. Melatonin enhanced thrombin-evoked Ca2+ release and entry and further increased Ca2+ mobilization observed in platelets from vaccinated sheep. These observations suggest that the use of melatonin, as a novel adjuvant, induces beneficial effects on platelet function and haemostasis, and opens new perspectives for therapeutic manipulation of immune responses to vaccination.
Collapse
Affiliation(s)
- Sergio Regodón
- Department of Animal Medicine, University of Extremadura, Cáceres, Spain
| | | | | | | | | | | | | |
Collapse
|
20
|
Zbidi H, Salido S, Altarejos J, Perez-Bonilla M, Bartegi A, Rosado JA, Salido GM. Olive tree wood phenolic compounds with human platelet antiaggregant properties. Blood Cells Mol Dis 2009; 42:279-85. [PMID: 19195914 DOI: 10.1016/j.bcmd.2009.01.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2008] [Accepted: 01/07/2009] [Indexed: 12/23/2022]
Abstract
Oleuropein and (+)-cycloolivil are natural polyphenolic compounds with a significant radical scavenging activity present in olive tree. We have investigated the antiaggregant effects of oleuropein and (+)-cycloolivil isolated from an ethyl acetate extract of olive tree wood. Oleuropein and (+)-cycloolivil reduced the ability of thrombin to stimulate platelet aggregation. Both compounds reduced thrombin-evoked Ca(2+) release and entry to a similar extent to hydroxytyrosol. This effect was greater in platelets from patients with type 2 diabetes mellitus than in controls. Thrombin-, thapsigargin- and 2,5-di-(tert-butyl)-1,4-hydroquinone (TBHQ)-evoked protein tyrosine phosphorylation, which is involved in Ca(2+) signalling and platelet aggregation, is inhibited by oleuropein and (+)-cycloolivil. oleuropein and (+)-cycloolivil are natural oxygen radical scavengers that reduce thrombin-induced protein tyrosine phosphorylation, Ca(2+) signalling and platelet aggregation. These observations suggest that oleuropein and (+)-cycloolivil may prevent thrombotic complications associated to platelet hyperaggregability and be the base for the development of antiaggregant therapeutic strategies.
Collapse
Affiliation(s)
- Hanene Zbidi
- Unité de Recherche de Biochimie, Institut Supérieur de Biotechnologie, 5019-Monastir, Tunisia
| | | | | | | | | | | | | |
Collapse
|