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Nyárády BB, Kiss LZ, Bagyura Z, Merkely B, Dósa E, Láng O, Kőhidai L, Pállinger É. Growth and differentiation factor-15: A link between inflammaging and cardiovascular disease. Biomed Pharmacother 2024; 174:116475. [PMID: 38522236 DOI: 10.1016/j.biopha.2024.116475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/13/2024] [Accepted: 03/19/2024] [Indexed: 03/26/2024] Open
Abstract
Age-related disorders are closely linked to the accumulation of senescent cells. The senescence-associated secretory phenotype (SASP) sustains and progresses chronic inflammation, which is involved in cellular and tissue dysfunction. SASP-related growth and differentiation factor-15 (GDF-15) is an immunoregulatory cytokine that is coupled to aging and thus may have a regulatory role in the development and maintenance of atherosclerosis, a major cause of cardiovascular disease (CVD). Although the effects of GDF-15 are tissue-specific and dependent on microenvironmental changes such as inflammation, available data suggest that GDF-15 has a significant role in CVD. Thus, GDF-15 is a promising biomarker and potential therapeutic target for atherosclerotic CVD.
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Affiliation(s)
- Balázs Bence Nyárády
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest H-1122, Hungary.
| | - Loretta Zsuzsa Kiss
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest H-1122, Hungary.
| | - Zsolt Bagyura
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest H-1122, Hungary.
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest H-1122, Hungary.
| | - Edit Dósa
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest H-1122, Hungary.
| | - Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest H-1089, Hungary.
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest H-1089, Hungary.
| | - Éva Pállinger
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest H-1089, Hungary.
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Kiss LZ, Nyárády BB, Pállinger É, Lux Á, Jermendy ÁL, Csobay-Novák C, Soós P, Szelid Z, Láng O, Kőhidai L, Dinya E, Dósa E, Merkely B, Bagyura Z. Association of growth and differentiation factor-15 with coronary artery calcium score and ankle-brachial index in a middle-aged and elderly Caucasian population sample free of manifest cardiovascular disease. GeroScience 2024; 46:1343-1350. [PMID: 37548881 PMCID: PMC10828406 DOI: 10.1007/s11357-023-00899-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 07/30/2023] [Indexed: 08/08/2023] Open
Abstract
Growth and differentiation factor-15 (GDF-15) is a stress-associated cytokine of the transforming growth factor-β superfamily. The inflammatory and angiogenic effects of GDF-15 in atherosclerosis are controversial, and its correlation with the long asymptomatic phase of the disease is not well understood. Coronary artery calcium score (CACS) and ankle-brachial index (ABI) are sensitive markers of subclinical atherosclerosis. To date, only a few studies have examined the impact of GDF-15 on coronary artery calcification, and the association between GDF-15 and ABI has not been evaluated. Therefore, we aimed to investigate the possible relationship between serum GDF-15 concentrations and CACS and ABI in a Caucasian population sample of middle-aged (35-65 years) and elderly (> 65 years) people. In addition to recording demographic and anthropometric characteristics, atherosclerotic risk factors, and laboratory tests including serum HDL-cholesterol, LDL-cholesterol, hemoglobin A1c (HbA1c), high-sensitivity C-reactive protein, and N-terminal pro-B-type natriuretic peptide (NT-proBNP); GDF-15 level, cardiac computed tomography, and ABI measurements were also performed. A total of 269 asymptomatic individuals (men, n = 125; median age, 61.5 [IQR, 12.7] years) formed the basis of this study. Participants were divided into two groups according to their age (middle-aged, n = 175 and elderly, n = 94). Hypertension and diabetes mellitus were significantly more prevalent and CACS values and HbA1c, NT-proBNP, and GDF-15 levels were significantly higher (all p < 0.001) in the elderly group compared to the middle-aged group. Multivariate ridge regression analysis revealed a significant positive association between GDF-15 and CACS (middle-aged group: β = 0.072, p = 0.333; elderly group: β = 0.148, p = 0.003), and between GDF-15 and ABI (middle-aged group: β = 0.062, p = 0.393; elderly group: β = 0.088, p = 0.041) only in the elderly group. Our results show that GDF-15 is not only a useful biomarker of inflammation but can also predict early signs of asymptomatic atherosclerosis, especially in elderly people with chronic systemic inflammation associated with aging (inflammaging).
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Affiliation(s)
- Loretta Zsuzsa Kiss
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary.
| | - Balázs Bence Nyárády
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary
| | - Éva Pállinger
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, 4 Nagyvárad Square, 1089, Budapest, Hungary
| | - Árpád Lux
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary
- Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, Maastricht, Netherlands
| | - Ádám Levente Jermendy
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary
| | - Csaba Csobay-Novák
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary
| | - Pál Soós
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary
| | - Zsolt Szelid
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary
| | - Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, 4 Nagyvárad Square, 1089, Budapest, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, 4 Nagyvárad Square, 1089, Budapest, Hungary
| | - Elek Dinya
- Institute of Digital Health Sciences, Semmelweis University, 15 Ferenc Square, 1094, Budapest, Hungary
| | - Edit Dósa
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary
| | - Zsolt Bagyura
- Heart and Vascular Center, Semmelweis University, 68 Városmajor Street, 1122, Budapest, Hungary
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Kőhidai Z, Takács A, Lajkó E, Géczi Z, Pállinger É, Láng O, Kőhidai L. The effects of mouthwashes in human gingiva epithelial progenitor (HGEPp) cells. Clin Oral Investig 2022; 26:4559-4574. [PMID: 35257248 PMCID: PMC9203393 DOI: 10.1007/s00784-022-04422-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 02/17/2022] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The gingiva epithelium accounts for a significant proportion of the surface around the tooth. An inflammatory reaction occurs in the presence of bacterial biofilm, adhesion is reduced, and the depth of the sulcus gingivalis increases. The most common antiseptic agents in oral rinses are chlorhexidine digluconate (CHX) and cetylpyridinium chloride. We examined long-lasting effects of residual concentrations of eight commercially available rinses. Our main goals were (i) to analyze the effect of different chemical compositions on cell proliferation, (ii) to examine apoptosis, and (iii) cell morphology on human epithelial progenitor cell line (HGEPp). MATERIALS AND METHODS Cell proliferation was measured in a real-time system (0-48 h) by impedimetry (xCELLigence). Apoptosis was measured with labeled Annexin-V (BD-FACScalibur). RESULTS Changes in proliferation were measured at certain concentrations: (i) H2O2 proved to be cytotoxic at almost all concentrations; (ii) low concentrations of CHX (0.0001%; 0.0003%) were proliferation inducers, while higher concentrations were cytotoxic; (iii) for ClO2, advantageous proliferative effect was observed over a broad concentration range (0.06-6 ppm). In mouthwashes, additives in the formulation (e.g., allantoin) appeared to influence cellular responses positively. Apoptosis marker assay results suggested a low-level activation by the tested agents. CONCLUSIONS Mouthwashes and their reference compounds proved to have concentration-dependent cytotoxic effects on human gingival epithelial cells. CLINICAL RELEVANCE A better understanding of the effects of mouthwashes and their reference compounds is particularly important. These concentration-dependent effects (cytotoxic or proliferation inducing) interfere with human cells physiology while being used in the fight against the pathogenic flora.
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Affiliation(s)
- Zsófia Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary.
- Department of Oral Diagnostics, Semmelweis University, Budapest, Hungary.
| | - Angéla Takács
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Eszter Lajkó
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Zoltán Géczi
- Department of Prosthodontics, Semmelweis University, Budapest, Hungary
| | - Éva Pállinger
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
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Bagyura Z, Takács A, Kiss L, Dósa E, Vadas R, Nguyen TD, Dinya E, Soós P, Szelid Z, Láng O, Pállinger É, Kőhidai L, Merkely B. Level of advanced oxidation protein products is associated with subclinical atherosclerosis. BMC Cardiovasc Disord 2022; 22:5. [PMID: 34996369 PMCID: PMC8742310 DOI: 10.1186/s12872-021-02451-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 12/16/2021] [Indexed: 11/16/2022] Open
Abstract
Background Oxidative stress is an important factor in the pathomechanism of atherosclerosis. Advanced oxidation protein products (AOPPs) are considered markers of oxidative stress. Thickening of the carotid intima-media layers indicates subclinical atherosclerosis and can be detected by carotid ultrasound. Objective Our aim was to examine the association between carotid intima-media thickness (CIMT) and the level of AOPPs. Methods Carotid duplex scans and measurements of AOPPs were performed on 476 participants of a cardiovascular population study. The presence of conventional cardiovascular risk factors was investigated with a questionnaire, physical examination, and laboratory tests. Results There was a positive correlation between maximum CIMT and the level of AOPPs only in the male population (r = 0.219, p = 0.033). Multivariate analysis has revealed that the association between AOPPs and mean or maximum CIMT was independent of cardiovascular risk factors (OR = 1.458, p = 0.004, and OR = 2.038, p < 0.001). Conclusions Among males, the elevated level of AOPPs as a marker of oxidative stress may signal the existence of early atherosclerotic alterations.
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Affiliation(s)
- Zsolt Bagyura
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest, 1122, Hungary
| | - Angéla Takács
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest, 1089, Hungary.
| | - Loretta Kiss
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest, 1122, Hungary
| | - Edit Dósa
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest, 1122, Hungary
| | - Réka Vadas
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest, 1122, Hungary
| | - Tin Dat Nguyen
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest, 1122, Hungary
| | - Elek Dinya
- Institute of Digital Health Sciences, Semmelweis University, Ferenc tér 15, Budapest, 1094, Hungary
| | - Pál Soós
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest, 1122, Hungary
| | - Zsolt Szelid
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest, 1122, Hungary
| | - Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest, 1089, Hungary
| | - Éva Pállinger
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest, 1089, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest, 1089, Hungary
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Városmajor utca 68, Budapest, 1122, Hungary
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Takács A, Szász Z, Kalabay M, Bárány P, Csámpai A, Hegyesi H, Láng O, Lajkó E, Kőhidai L. The Synergistic Activity of Bortezomib and TIC10 against A2058 Melanoma Cells. Pharmaceuticals (Basel) 2021; 14:ph14080820. [PMID: 34451917 PMCID: PMC8399995 DOI: 10.3390/ph14080820] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 08/06/2021] [Accepted: 08/17/2021] [Indexed: 11/17/2022] Open
Abstract
Combination antitumor treatments are essential parts of modern tumor therapy as—compared to monotherapies—(i) they are more effective; (ii) the dose of the compounds can be reduced; and (iii) therefore the side effects are improved. Our research group previously demonstrated the antitumor character of bortezomib (BOZ) in A2058 melanoma cells. Unfortunately, dose-related side effects are common during BOZ therapy, which could be prevented by reducing the dose of BOZ. This study aimed to characterize synergistic combinations of BOZ with a TRAIL (TNF-related apoptosis-inducing ligand) -inducing compound (TIC10), where the doses can be cut down but the efficacy is preserved. Endpoint cell viability assays were performed on A2058 cells, and synergism of BOZ and TIC10 was observed after 72 h. Synergism was further validated in a real-time impedimetric assay, and our results showed that BOZ-treated melanoma cells survived the treatment, an effect not registered in the co-treatments. Treatment with the combinations resulted in increased apoptosis, which was not accompanied by enhanced LDH release. Nevertheless, the expression of death receptor 5 (DR5) was increased on the cell surface without transcriptional regulation. In summary, our findings support the theory that the application of BOZ and TIC10 in combination could provide higher efficacy in vitro.
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Affiliation(s)
- Angéla Takács
- Department of Genetics, Cell and Immunobiology, Semmelweis University, H-1089 Budapest, Hungary; (A.T.); (Z.S.); (M.K.); (H.H.); (O.L.); (E.L.)
| | - Zsófia Szász
- Department of Genetics, Cell and Immunobiology, Semmelweis University, H-1089 Budapest, Hungary; (A.T.); (Z.S.); (M.K.); (H.H.); (O.L.); (E.L.)
| | - Márton Kalabay
- Department of Genetics, Cell and Immunobiology, Semmelweis University, H-1089 Budapest, Hungary; (A.T.); (Z.S.); (M.K.); (H.H.); (O.L.); (E.L.)
| | - Péter Bárány
- Department of Organic Chemistry, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary; (P.B.); (A.C.)
| | - Antal Csámpai
- Department of Organic Chemistry, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary; (P.B.); (A.C.)
| | - Hargita Hegyesi
- Department of Genetics, Cell and Immunobiology, Semmelweis University, H-1089 Budapest, Hungary; (A.T.); (Z.S.); (M.K.); (H.H.); (O.L.); (E.L.)
| | - Orsolya Láng
- Department of Genetics, Cell and Immunobiology, Semmelweis University, H-1089 Budapest, Hungary; (A.T.); (Z.S.); (M.K.); (H.H.); (O.L.); (E.L.)
| | - Eszter Lajkó
- Department of Genetics, Cell and Immunobiology, Semmelweis University, H-1089 Budapest, Hungary; (A.T.); (Z.S.); (M.K.); (H.H.); (O.L.); (E.L.)
| | - László Kőhidai
- Department of Genetics, Cell and Immunobiology, Semmelweis University, H-1089 Budapest, Hungary; (A.T.); (Z.S.); (M.K.); (H.H.); (O.L.); (E.L.)
- Correspondence:
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Láng O, Nagy KS, Láng J, Perczel-Kovách K, Herczegh A, Lohinai Z, Varga G, Kőhidai L. Comparative study of hyperpure chlorine dioxide with two other irrigants regarding the viability of periodontal ligament stem cells. Clin Oral Investig 2020; 25:2981-2992. [PMID: 33044682 PMCID: PMC8060220 DOI: 10.1007/s00784-020-03618-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 10/01/2020] [Indexed: 02/07/2023]
Abstract
Objectives Periodontal ligament stem cells (PDLSCs) have an underlined significance as their high proliferative capacity and multipotent differentiation provide an important therapeutic potential. The integrity of these cells is frequently disturbed by the routinely used irrigative compounds applied as periodontal or endodontic disinfectants (e.g., hydrogen peroxide (H2O2) and chlorhexidine (CHX)). Our objectives were (i) to monitor the cytotoxic effect of a novel dental irrigative compound, chlorine dioxide (ClO2), compared to two traditional agents (H2O2, CHX) on PDLSCs and (ii) to test whether the aging factor of PDLSC cultures determines cellular responsiveness to the chemicals tested. Methods Impedimetry (concentration-response study), WST-1 assays (WST = water soluble tetrazolium salt), and morphology analysis were performed to measure changes in cell viability induced by the 3 disinfectants; immunocytochemistry of stem cell markers (STRO-1, CD90, and CD105) measured the induced mesenchymal characteristics. Results Cell viability experiments demonstrated that the application of ClO2 does not lead to a significant decrease in viability of PLDSCs in concentrations used to kill microbes. On the contrary, traditional irrigants, H2O2, and CHX are highly toxic on PDLSCs. Aging of PLDSC cultures (passages 3 vs. 7) has characteristic effects on their responsiveness to these agents as the increased expression of mesenchymal stem cell markers turns to decreased. Conclusions and clinical relevance While the active ingredients of mouthwash (H2O2, CHX) applied in endodontic or periodontitis management have a serious toxic effect on PDLSCs, the novel hyperpure ClO2 is less toxic providing an environment favoring dental structure regenerations during disinfectant interventions. Electronic supplementary material The online version of this article (10.1007/s00784-020-03618-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Krisztina S Nagy
- Department of Oral Biology, Semmelweis University, Budapest, Hungary.,Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Julia Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Katalin Perczel-Kovách
- Department of Oral Biology, Semmelweis University, Budapest, Hungary.,Department in Community Dentistry, Semmelweis University, Budapest, Hungary
| | - Anna Herczegh
- Department of Conservative Dentistry, Semmelweis University, Budapest, Hungary
| | - Zsolt Lohinai
- Department of Conservative Dentistry, Semmelweis University, Budapest, Hungary
| | - Gábor Varga
- Department of Oral Biology, Semmelweis University, Budapest, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary.
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Pethő L, Kasza G, Lajkó E, Láng O, Kőhidai L, Iván B, Mező G. Amphiphilic drug-peptide-polymer conjugates based on poly(ethylene glycol) and hyperbranched polyglycerol for epidermal growth factor receptor targeting: the effect of conjugate aggregation on in vitro activity. Soft Matter 2020; 16:5759-5769. [PMID: 32530018 DOI: 10.1039/d0sm00428f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Numerous peptide-drug conjugates have been developed over the years to enhance the specificity and selectivity of chemotherapeutic agents for tumour cells. In our present work, epidermal growth factor receptor targeting drug-peptide conjugates were prepared using GE11 and D4 peptides. To ensure the drug release, the cathepsin B labile GFLG spacer was incorporated between the targeting peptide and the drug molecule (daunomycin), which significantly increased the hydrophobicity and thereby decreased the water solubility of the conjugates. To overcome the solubility problem, drug-peptide-polymer conjugates with systematic structural variations were prepared, by linking poly(ethylene glycol) (PEG) or a well-defined amino-monofunctional hyperbranched polyglycerol (HbPG) directly or via a pentaglycine spacer to the targeting peptides. All the drug-peptide-polymer conjugates were water-soluble as confirmed by turbidimetric measurements. The results of the in vitro cell viability and cellular uptake measurements on HT-29 human colon adenocarcinoma cells proved that the HbPG and the PEG highly influenced the biological activity. The conjugation of the hydrophilic polymer resulted in the amphiphilic character of the conjugates, which led to self-aggregation and nanoparticle formation that decreased the cellular uptake above a specific aggregation concentration. On the other hand, the hydrodynamic volume and the different polymer chain topology of the linear PEG and the compact hyperbranched HbPG also played an important role in the biological activity. Therefore, in similar systems, the investigation of the colloidal properties is inevitable for the better understanding of the biological activity, which can reveal the structure-activity relationship of amphiphilic drug-peptide-polymer conjugates for efficient tumour targeting.
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Affiliation(s)
- Lilla Pethő
- MTA-ELTE Research Group of Peptide Chemistry, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary.
| | - György Kasza
- Polymer Chemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, H-1117 Budapest, Magyar tudósok körútja 2, Hungary.
| | - Eszter Lajkó
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, H-1089 Budapest, Nagyvárad tér 4, Hungary
| | - Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, H-1089 Budapest, Nagyvárad tér 4, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, H-1089 Budapest, Nagyvárad tér 4, Hungary
| | - Béla Iván
- Polymer Chemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, H-1117 Budapest, Magyar tudósok körútja 2, Hungary.
| | - Gábor Mező
- MTA-ELTE Research Group of Peptide Chemistry, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary. and Eötvös Loránd University, Faculty of Science, Institute of Chemistry, H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary
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Fazekas R, Molnár B, Kőhidai L, Láng O, Molnár E, Gánti B, Michailovits G, Windisch P, Vág J. Blood flow kinetics of a xenogeneic collagen matrix following a vestibuloplasty procedure in the human gingiva-An explorative study. Oral Dis 2019; 25:1780-1788. [PMID: 31336001 DOI: 10.1111/odi.13163] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 05/24/2019] [Accepted: 07/15/2019] [Indexed: 12/14/2022]
Abstract
OBJECTIVES The aim of the present study was to investigate temporal and spatial blood flow patterns following vestibuloplasty procedures using a collagen matrix (CM) to get an insight into the timing and direction of neovascularization in the CM. METHODS Five patients were treated using a modified apically repositioned flap combined with a CM. Intraoral photographs and blood flow measurements by laser speckle contrast imaging were taken for 12 months. Thirty regions of interest in the graft and the surrounding mucosa were evaluated. The clinical parameters were assessed after 6 and 12 months. VEGF expression was analyzed in the wound fluid on days 2 and 4. RESULTS At 6 months, the mean width of keratinized gingiva increased, but the thickness was unchanged. Scar formation was observed in all cases. Perfusion in the graft began to increase at the lateral and coronal edges and then spread concentrically toward the center. The apical side showed a significant delay in perfusion, the highest VEGF expression, and wound fluid production as well as the most abundant scar formation. CONCLUSIONS Neovascularization occurs mainly from the lateral and coronal edges, which may limit the extent of the surgical area. Abundant scar formation may be explained by increased VEGF expression induced by prolonged ischemia in this area.
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Affiliation(s)
- Réka Fazekas
- Department of Conservative Dentistry, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Bálint Molnár
- Department of Periodontology, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Eszter Molnár
- Department of Conservative Dentistry, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Bernadett Gánti
- Department of Conservative Dentistry, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Georgina Michailovits
- Department of Periodontology, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Péter Windisch
- Department of Periodontology, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - János Vág
- Department of Conservative Dentistry, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
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Nagy K, Láng O, Láng J, Perczel-Kovách K, Gyulai-Gaál S, Kádár K, Kőhidai L, Varga G. A novel hydrogel scaffold for periodontal ligament stem cells. Interv Med Appl Sci 2018; 10:162-170. [PMID: 30713756 PMCID: PMC6343580 DOI: 10.1556/1646.10.2018.21] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Periodontal ligament stem cells (PDLSCs) possess extensive regeneration potential. However, their therapeutic application demands a scaffold with appropriate properties. HydroMatrix (HydM) is a novel injectable peptide nanofiber hydrogel developed recently for cell culture. Our aim was to test whether HydM would be a suitable scaffold for proliferation and osteogenic differentiation of PDLSCs. PDLSCs were seeded on non-coated or HydM-coated surfaces. Both real-time impedance analysis and cell viability assay documented cell growth on HydM. PDLSCs showed healthy, fibroblast-like morphology on the hydrogel. After a 3-week-long culture in osteogenic medium, mineralization was much more intense in HydM cultures compared to control. Alkaline phosphatase activity of the cells grown on the gels reached the non-coated control levels. Our data provided evidence that PDLSCs can adhere, survive, migrate, and proliferate on HydM and this gel also supports their osteogenic differentiation. We first applied impedimetry for dental stem cells cultured on a scaffold. HydM is ideal for in vitro studies of PDLSCs. It may also serve not only as a reference material but also in the future as a promising biocompatible scaffold for preclinical studies.
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Affiliation(s)
- Krisztina Nagy
- Department of Oral Biology, Semmelweis University, Budapest, Hungary
| | - Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Júlia Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Katalin Perczel-Kovách
- Department of Oral Biology, Semmelweis University, Budapest, Hungary.,Department of Community Dentistry, Semmelweis University, Budapest, Hungary
| | | | - Kristóf Kádár
- Department of Oral Biology, Semmelweis University, Budapest, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Gábor Varga
- Department of Oral Biology, Semmelweis University, Budapest, Hungary
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10
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Polgár L, Lajkó E, Soós P, Láng O, Manea M, Merkely B, Mező G, Kőhidai L. Drug targeting to decrease cardiotoxicity - determination of the cytotoxic effect of GnRH-based conjugates containing doxorubicin, daunorubicin and methotrexate on human cardiomyocytes and endothelial cells. Beilstein J Org Chem 2018; 14:1583-1594. [PMID: 30013686 PMCID: PMC6037002 DOI: 10.3762/bjoc.14.136] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 06/08/2018] [Indexed: 12/11/2022] Open
Abstract
Background: Cardiomyopathy induced by the chemotherapeutic agents doxorubicin and daunorubicin is a major limiting factor for their application in cancer therapy. Chemotactic drug targeting potentially increases the tumor selectivity of drugs and decreases their cardiotoxicity. Increased expression of gonadotropin-releasing hormone (GnRH) receptors on the surface of tumor cells has been reported. Thus, the attachment of the aforementioned chemotherapeutic drugs to GnRH-based peptides may result in compounds with increased therapeutic efficacy. The objective of the present study was to examine the cytotoxic effect of anticancer drug–GnRH-conjugates against two essential cardiovascular cell types, such as cardiomyocytes and endothelial cells. Sixteen different previously developed GnRH-conjugates containing doxorubicin, daunorubicin and methotrexate were investigated in this study. Their cytotoxicity was determined on primary human cardiac myocytes (HCM) and human umbilical vein endothelial cells (HUVEC) using the xCELLigence SP system, which measures impedance changes caused by adhering cells on golden electrode arrays placed at the bottom of the wells. Slopes of impedance–time curves were calculated and for the quantitative determination of cytotoxicity, the difference to the control was analysed. Results: Doxorubicin and daunorubicin exhibited a cytotoxic effect on both cell types, at the highest concentrations tested. Doxorubicin-based conjugates (AN-152, GnRH-III(Dox-O-glut), GnRH-III(Dox-glut-GFLG) and GnRH-III(Dox=Aoa-GFLG) showed the same cytotoxic effect on cardiomyocytes. Among the daunorubicin-based conjugates, [4Lys(Ac)]-GnRH-III(Dau=Aoa), GnRH-III(Dau=Aoa-YRRL), {GnRH-III(Dau=Aoa-YRRL-C)}2 and {[4N-MeSer]-GnRH-III(Dau-C)}2 had a significant but decreased cytotoxic effect, while the other conjugates – GnRH-III(Dau=Aoa), GnRH-III(Dau=Aoa-K(Dau=Aoa)), [4Lys(Dau=Aoa)]-GnRH-III(Dau=Aoa), GnRH-III(Dau=Aoa-GFLG), {GnRH-III(Dau-C)}2 and [4N-MeSer]-GnRH-III(Dau=Aoa) – exerted no cytotoxic effect on cardiomyocytes. Mixed conjugates containing methotrexate and daunorubicin – GnRH-III(Mtx-K(Dau=Aoa)) and [4Lys(Mtx)]-GnRH-III(Dau=Aoa) – showed no cytotoxic effect on cardiomyocytes, as well. Conclusion: Based on these results, anticancer drug–GnRH-based conjugates with no cytotoxic effect on cardiomyocytes were identified. In the future, these compounds could provide a more targeted antitumor therapy with no cardiotoxic adverse effects. Moreover, impedimetric cytotoxicity analysis could be a valuable technique to determine the effect of drugs on cardiomyocytes.
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Affiliation(s)
- Livia Polgár
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary.,Chemotaxis Research Group, Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary
| | - Eszter Lajkó
- Chemotaxis Research Group, Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary
| | - Pál Soós
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary
| | - Orsolya Láng
- Chemotaxis Research Group, Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary
| | - Marilena Manea
- University of Konstanz, Department of Chemistry and Zukunftskolleg, Universitätsstrasse 10, 78467 Konstanz, Germany
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary
| | - Gábor Mező
- Eötvös Loránd University, Faculty of Science, Institute of Chemistry, Pázmány P. stny 1/A Budapest, 1117, Hungary.,MTA-ELTE Research Group of Peptide Chemistry, Pázmány P. stny 1/A, Hungarian Academy of Science, Budapest, 1117, Hungary
| | - László Kőhidai
- Chemotaxis Research Group, Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary
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11
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Kovács ÁF, Láng O, Turiák L, Ács A, Kőhidai L, Fekete N, Alasztics B, Mészáros T, Buzás EI, Rigó J, Pállinger É. The impact of circulating preeclampsia-associated extracellular vesicles on the migratory activity and phenotype of THP-1 monocytic cells. Sci Rep 2018; 8:5426. [PMID: 29615814 PMCID: PMC5882809 DOI: 10.1038/s41598-018-23706-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 03/13/2018] [Indexed: 12/15/2022] Open
Abstract
Intercellular communication via extracellular vesicles (EVs) and their target cells, especially immune cells, results in functional and phenotype changes that consequently may play a significant role in various physiological states and the pathogenesis of immune-mediated disorders. Monocytes are the most prominent environment-sensing immune cells in circulation, skilled to shape their microenvironments via cytokine secretion and further differentiation. Both the circulating monocyte subset distribution and the blood plasma EV pattern are characteristic for preeclampsia, a pregnancy induced immune-mediated hypertensive disorder. We hypothesized that preeclampsia-associated EVs (PE-EVs) induced functional and phenotypic alterations of monocytes. First, we proved EV binding and uptake by THP-1 cells. Cellular origin and protein cargo of circulating PE-EVs were characterized by flow cytometry and mass spectrometry. An altered phagocytosis-associated molecular pattern was found on 12.5 K fraction of PE-EVs: an elevated CD47 "don't eat me" signal (p < 0.01) and decreased exofacial phosphatidylserine "eat-me" signal (p < 0.001) were found along with decreased uptake of these PE-EVs (p < 0.05). The 12.5 K fraction of PE-EVs induced significantly lower chemotaxis (p < 0.01) and cell motility but accelerated cell adhesion of THP-1 cells (p < 0.05). The 12.5 K fraction of PE-EVs induced altered monocyte functions suggest that circulating EVs may have a role in the pathogenesis of preeclampsia.
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Affiliation(s)
- Árpád Ferenc Kovács
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary.
| | - Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Lilla Turiák
- MS Proteomics Research Group, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - András Ács
- MS Proteomics Research Group, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Nóra Fekete
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Bálint Alasztics
- 1st Department of Obstetrics and Gynaecology, Semmelweis University, Budapest, Hungary
| | - Tamás Mészáros
- Seroscience Ltd, Budapest, Hungary
- Nanomedicine Research and Education Center, Institute of Pathophysiology, Semmelweis University, Budapest, Hungary
| | - Edit Irén Buzás
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
- MTA-SE Immunoproteogenomics Extracellular Vesicle Research Group, Budapest, Hungary
| | - János Rigó
- 1st Department of Obstetrics and Gynaecology, Semmelweis University, Budapest, Hungary
| | - Éva Pállinger
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
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12
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Polgár L, Soós P, Lajkó E, Láng O, Merkely B, Kőhidai L. Platelet impedance adhesiometry: A novel technique for the measurement of platelet adhesion and spreading. Int J Lab Hematol 2018. [PMID: 29512878 DOI: 10.1111/ijlh.12799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Thrombogenesis plays an important role in today's morbidity and mortality. Antithrombotics are among the most frequently prescribed drugs. Thorough knowledge of platelet function is needed for optimal clinical care. Platelet adhesion is a separate subprocess of platelet thrombus formation; still, no well-standardized technique for the isolated measurement of platelet adhesion exists. Impedimetry is one of the most reliable, state-of-art techniques to analyze cell adhesion, proliferation, viability, and cytotoxicity. We propose impedimetry as a feasible novel method for the isolated measurement of 2 significant platelet functions: adhesion and spreading. METHODS Laboratory reference platelet agonists (epinephrine, ADP, and collagen) were applied to characterize platelet functions by impedimetry using the xCELLigence SP system. Platelet samples were obtained from 20 healthy patients under no drug therapy. Standard laboratory parameters and clinical patient history were also analyzed. RESULTS Epinephrine and ADP increased platelet adhesion in a concentration-dependent manner, while collagen tended to have a negative effect. Serum sodium and calcium levels and age had a negative correlation with platelet adhesion induced by epinephrine and ADP, while increased immunoreactivity connected with allergic diseases was associated with increased platelet adhesion induced by epinephrine and ADP. ADP increased platelet spreading in a concentration-dependent manner. CONCLUSION Impedimetry proved to be a useful and sensitive method for the qualitative and quantitated measurement of platelet adhesion, even differentiating between subgroups of a healthy population. This novel technique is offered as an important method in the further investigation of platelet function.
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Affiliation(s)
- L Polgár
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary.,Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - P Soós
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - E Lajkó
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - O Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - B Merkely
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - L Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
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13
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Láng O, Kőhidai L, Wegener J. Label-free profiling of cell dynamics: A sequence of impedance-based assays to estimate tumor cell invasiveness in vitro. Exp Cell Res 2017; 359:243-250. [PMID: 28734866 DOI: 10.1016/j.yexcr.2017.07.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 06/30/2017] [Accepted: 07/18/2017] [Indexed: 11/19/2022]
Abstract
Dynamic properties of cancer cells, most notably their ability to migrate, have been correlated successfully with their invasive nature in vivo. To establish a stronger experimental basis for such a correlation we subjected five different cancer cell lines of well-defined metastatic potential to a sequence of three independent assays reporting on three different aspects of cell dynamics, namely (1) the kinetics of cell spreading, (2) cell shape fluctuations, and (3) cell migration. The sequentially applied assays correspond to different measuring modes of the well-established ECIS technique that is based on non-invasive and label-free impedance readings of planar gold-film electrodes that serve as the growth substrate for the cells under study. Every individual assay returned a characteristic parameter describing the behavior of the cell lines in that particular assay quantitatively. The parameters of all three assays were ranked to establish individual profiles of cell dynamics for every cell line that correlate favorably with the cells' invasive properties. The sequence of impedance-based assays described here requires only small cell populations (< 10.000 cells), it is highly automated and easily adapted to 96-well formats. It provides an in-depth dynamic profile of adherent cells that might be useful in other areas besides cancer research as well.
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Affiliation(s)
- Orsolya Láng
- Department Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4., 1089 Budapest, Hungary; Institut fuer Analytische Chemie, Chemo- & Biosensorik, Universitaet Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany.
| | - László Kőhidai
- Department Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4., 1089 Budapest, Hungary.
| | - Joachim Wegener
- Institut fuer Analytische Chemie, Chemo- & Biosensorik, Universitaet Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany; Fraunhofer-Einrichtung für Mikrosysteme und Festkörper-Technologien, Hansastr. 27D, 80686 München, Germany.
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14
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Bäcker H, Polgár L, Soós P, Lajkó E, Láng O, Merkely B, Szabó G, Dohmen PM, Weymann A, Kőhidai L. Impedimetric Analysis of the Effect of Decellularized Porcine Heart Scaffold on Human Fibrosarcoma, Endothelial, and Cardiomyocyte Cell Lines. Med Sci Monit 2017; 23:2232-2240. [PMID: 28493851 PMCID: PMC5436501 DOI: 10.12659/msm.901527] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Experiments on porcine heart scaffold represent significant assays in development of immunoneutral materials for cardiac surgery. Characterization of cell-cell and cell-scaffold interactions is essential to understand the homing process of cardiac cells into the scaffolds. MATERIAL AND METHODS In the present study, the highly sensitive and real-time impedimetric technique of xCELLigence SP was used to monitor cell adhesion, which is the key process of recellularization in heart scaffolds. Our objectives were: (i) to characterize the effect of decellularized porcine heart scaffold on cell adhesion of human cardiovascular cells potentially used in the recellularization process; and (ii) to investigate cell-extracellular matrix element interactions for building artificial multi-layer systems, applied as cellular models of recellularization experiments. Human fibrosarcoma, endothelial, and cardiomyocyte cells were investigated and the effect of decellularized porcine heart scaffold (HS) and fibronectin on cell adhesion was examined. Adhesion was quantified as slope of curves. RESULTS Heart scaffold had neutral effect on cardiomyocytes as well as on endothelial cells. Adhesion of cardiomyocytes was increased by fibronectin (1.480±0.021) compared to control (0.745±0.029). The combination of fibronectin and HS induced stronger adhesion of cardiomyocytes (2.407±0.634) than fibronectin alone. Endothelial and fibrosarcoma cells showed similarly strong adhesion profiles with marked enhancer effect by fibronectin. CONCLUSIONS Decellularized porcine HS does not inhibit adhesion of human cardiovascular cells at the cell biological level, while fibronectin has strong cell adhesion-inducer effect, as well as an enhancer effect on activity of HS. Consequently, decellularized porcine hearts could be used as scaffolds for recellularization with cardiomyocytes and endothelial cells with fibronectin acting as a regulator, leading to construction of working bioartificial hearts.
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Affiliation(s)
- Henrik Bäcker
- Department of Cardiac Surgery, Heidelberg University, Heidelberg, Germany
| | - Livia Polgár
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary.,Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Pal Soós
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Eszter Lajkó
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Orsolya Láng
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Bela Merkely
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Gabor Szabó
- Department of Cardiac Surgery, Heidelberg University, Heidelberg, Germany
| | - Pascal M Dohmen
- Department of Cardiac Surgery, University Hospital Oldenburg, European Medical School Oldenburg-Groningen, Carl von Ossietzky University Oldenburg, Oldenburg, Germany
| | - Alexander Weymann
- Department of Cardiac Surgery, University Hospital Oldenburg, European Medical School Oldenburg-Groningen, Carl von Ossietzky University Oldenburg, Heidelberg, Germany
| | - Laszlo Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
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15
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Kőhidai L, Tóth K, Samotik P, Ranganathan K, Láng O, Tóth M, Ruskoaho H. Effect of vasoactive peptides in Tetrahymena: chemotactic activities of adrenomedullin, proadrenomedullin N-terminal 20 peptide (PAMP) and calcitonin gene-related peptide (CGRP). Mol Cell Biochem 2015; 411:271-80. [PMID: 26481478 DOI: 10.1007/s11010-015-2589-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 10/08/2015] [Indexed: 11/30/2022]
Abstract
Adrenomedullin (AMD), proadrenomedullin N-terminal 20 peptide (PAMP) and calcitonin gene-related peptide (CGRP) were studied for chemotaxis, chemotactic selection and G-actin/F-actin transition in Tetrahymena. The aim of the experiments was to study the effects of two different peptides encoded by the same gene compared to a peptide related to one of the two, but encoded by a different gene, at a low level of phylogeny. The positive, chemotactic effect of ADM and the strong negative, chemorepellent effect of PAMP suggest that in Tetrahymena, the two peptides elicit their chemotactic effects via different signalling mechanisms. The complexity of swimming behaviour modulated by the three peptides underlines that chemotaxis, chemokinesis and some characteristics of migratory behaviour (velocity, tortuosity) are working as a sub-population level complex functional unit. Chemotactic responsiveness to ADM and CGRP is short-term, in contrast to PAMP, which as a chemorepellent ligand, has the ability to select sub-populations with negative chemotactic responsiveness. The different effects of ADM and PAMP on the polymerization of actin networks show that the microtubular structure of cilia is more essential to chemotactic response than are transitions of the actin network. The results draw attention to the characteristic effects of vasoactive peptides at this low level of phylogeny.
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Affiliation(s)
- László Kőhidai
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary.
| | - Katalin Tóth
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary
| | - Paul Samotik
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary
| | - Kiran Ranganathan
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary
| | - Orsolya Láng
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary
| | - Miklós Tóth
- Department of Health Sciences and Sport Medicine, University of Health Science, Alkotás street 44., Budapest, 1123, Hungary
| | - Heikki Ruskoaho
- Division of Pharmacology and Pharmcotherapy, University of Helsinki, P.O.Box 56, 00014, Helsinki, Finland
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16
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Szabó R, Láng O, Láng J, Illyés E, Kőhidai L, Hudecz F. Effect of SXWS/WSXWS peptides on chemotaxis and adhesion of the macrophage-like cell line J774. J Mol Recognit 2015; 28:253-60. [PMID: 25683456 DOI: 10.1002/jmr.2439] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Revised: 09/28/2014] [Accepted: 09/28/2014] [Indexed: 11/06/2022]
Abstract
WSXWS motif is a conserved amino acid sequence that is present in type I cytokine receptors. This motif that can be found both in the ligand binding chains and signal transducer molecule of the receptors with different amino acids at the position "X" plays a role in the receptor folding, ligand binding and signal transduction as well. Structural analysis proved that WSEWS motif of IL-6R is located in a highly accessible location in the protein. Structural properties and chemotaxis of a tetrapeptide library with SXWS sequence, where X was the 19 proteinogenic amino acids except cystein were systematically studied earlier. It has been proved that C-terminal amidation and the identity of amino acid X had a pronounced influence on the chemotactic properties but less of the structure of the peptides. Here, we present our findings on the effect of a tetrapeptide and a pentapeptide library with the sequence of SXWS and WSXWS on the chemotaxis and adhesion of J774 murine macrophage cell line. We studied the effect of the presence/absence of N-terminal tryptophan and the different amino acids at the X position on these physiological responses. Results indicated that amino acid X had a marked influence on chemotaxis, adhesion as well as on proliferation induced by (W)SXWS peptides. Elongation of SXWS sequence with a tryptophan at the N terminus also altered pronouncedly all the physiological responses of the cells studied. A good correlation could be observed between the chemotaxis and the proliferation and physicochemical parameters of the amino acid X.
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Affiliation(s)
- Rita Szabó
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, P.O. Box 32, H-1518, Budapest, 112, Hungary
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17
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Arany E, Láng J, Somogyvári D, Láng O, Alapi T, Ilisz I, Gajda-Schrantz K, Dombi A, Kőhidai L, Hernádi K. Vacuum ultraviolet photolysis of diclofenac and the effects of its treated aqueous solutions on the proliferation and migratory responses of Tetrahymena pyriformis. Sci Total Environ 2014; 468-469:996-1006. [PMID: 24091123 DOI: 10.1016/j.scitotenv.2013.09.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Revised: 09/06/2013] [Accepted: 09/06/2013] [Indexed: 06/02/2023]
Abstract
The effects of dissolved O2, phosphate buffer and the initial concentration of diclofenac on the vacuum ultraviolet photolysis of this contaminant molecule were studied. Besides kinetic measurements, the irradiated, multicomponent samples were characterized via the proliferation and migratory responses (in sublethal concentrations) of the bioindicator eukaryotic ciliate Tetrahymena pyriformis. The results suggest that hydroxyl radicals, hydrogen atoms and hydroperoxyl radicals may all contribute to the degradation of diclofenac. The aromatic by-products of diclofenac were presumed to include a hydroxylated derivative, 1-(8-chlorocarbazolyl)acetic acid and 1-(8-hydroxycarbazolyl)acetic acid. The biological activity of photoexposed samples reflected the chemical transformation of diclofenac and was also dependent on the level of dissolved O2. The increase in toxicity of samples taken after different irradiation times did not exceed a factor of two. Our results suggest that the combination of vacuum ultraviolet photolysis with toxicity and chemotactic measurements can be a valuable method for the investigation of the elimination of micropollutants.
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Affiliation(s)
- Eszter Arany
- Research Group of Environmental Chemistry, Institute of Chemistry, University of Szeged, H-6720 Szeged, Rerrich Béla tér 1, Hungary
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18
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Láng O, Illyés E, Menyhárd DK, Láng J, Sebestyén F, Hudecz F, Kohidai L. Chemotaxis induced by SXWS tetrapeptides in Tetrahymena--overlapping chemotactic effects of SXWS sequences and their identical amino acids. J Mol Recognit 2012; 25:24-31. [PMID: 22213448 DOI: 10.1002/jmr.1166] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The chemotactic potential of SXWS peptides and the components of the extracellular domain of cytokine receptors were investigated in Tetrahymena as a functional index of substitution with different amino acids in the position 'X' of the tetrapeptide. Data obtained demonstrate that position X plays a special determining role in the ligand, SEWS and STWS possess extremely strong chemoattractant ability, and aromatic amino acids result in chemorepellent ligands. Diverse effects of structurally related molecules, for example, SNWS-SDWS, demonstrate a highly sensitive discrimination potential in the applied model system. Physicochemical characteristics (hydropathy, residue size, and solvent-exposed area) of the amino acids were correlated with the chemotactic activity. Data obtained by computer-assisted conformation analysis of SXWS peptides and the highly overlapping chemotactic effects of the investigated SXWS peptides as well as the presence of the amino acids in the 'X' position indicate that member 'X' of the SXWS sequence performs a special role in interactions with the chemotaxis receptors in the membrane.
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Affiliation(s)
- Orsolya Láng
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest, 1089, Hungary
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Szabó R, Bánóczi Z, Mező G, Láng O, Kőhidai L, Hudecz F. Daunomycin-polypeptide conjugates with antitumor activity. Biochimica et Biophysica Acta (BBA) - Biomembranes 2010; 1798:2209-16. [DOI: 10.1016/j.bbamem.2010.07.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Revised: 07/11/2010] [Accepted: 07/21/2010] [Indexed: 11/28/2022]
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Bai KB, Láng O, Orbán E, Szabó R, Köhidai L, Hudecz F, Mezö G. Design, Synthesis, and In Vitro Activity of Novel Drug Delivery Systems Containing Tuftsin Derivatives and Methotrexate. Bioconjug Chem 2008; 19:2260-9. [DOI: 10.1021/bc800115w] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Katalin B. Bai
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, and Department of Organic Chemistry, Eötvös L. University, P.O. Box 32, 1518 Budapest 112, Hungary, and Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Nagyvárad tér 4. H-1089, Hungary
| | - Orsolya Láng
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, and Department of Organic Chemistry, Eötvös L. University, P.O. Box 32, 1518 Budapest 112, Hungary, and Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Nagyvárad tér 4. H-1089, Hungary
| | - Erika Orbán
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, and Department of Organic Chemistry, Eötvös L. University, P.O. Box 32, 1518 Budapest 112, Hungary, and Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Nagyvárad tér 4. H-1089, Hungary
| | - Rita Szabó
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, and Department of Organic Chemistry, Eötvös L. University, P.O. Box 32, 1518 Budapest 112, Hungary, and Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Nagyvárad tér 4. H-1089, Hungary
| | - László Köhidai
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, and Department of Organic Chemistry, Eötvös L. University, P.O. Box 32, 1518 Budapest 112, Hungary, and Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Nagyvárad tér 4. H-1089, Hungary
| | - Ferenc Hudecz
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, and Department of Organic Chemistry, Eötvös L. University, P.O. Box 32, 1518 Budapest 112, Hungary, and Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Nagyvárad tér 4. H-1089, Hungary
| | - Gábor Mezö
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, and Department of Organic Chemistry, Eötvös L. University, P.O. Box 32, 1518 Budapest 112, Hungary, and Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Nagyvárad tér 4. H-1089, Hungary
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Láng O, Mezo G, Hudecz F, Kohidai L. Effect of tuftsin and oligotuftsins on chemotaxis and chemotactic selection in Tetrahymena pyriformis. Cell Biol Int 2006; 30:603-9. [PMID: 16733095 DOI: 10.1016/j.cellbi.2006.02.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2005] [Revised: 02/22/2006] [Accepted: 02/28/2006] [Indexed: 11/29/2022]
Abstract
The chemotactic properties of tuftsin (H-TKPR-OH), tuftsin derivatives (H-KPR-OH, H-TKPKG-NH(2), Ac-TKPKG-NH(2)) and TKPKG-based oligotuftsins (T20, T30, T40) were investigated in Tetrahymena pyriformis GL. In contrast to its effects on Mammalia, tuftsin elicited chemorepellent or neutral responses; truncation of the N-terminal part (KPR) led to similar results, though with more neutral effects. The significance of the C-terminal part of the molecule was revealed by the chemoattractant properties of TKPKG, which are nevertheless abolished by acylation. Among the oligotuftsins, T20 and T40 were chemoattractants at higher concentrations (10(-9)-10(-6) M), while T30 had a wide-ranging chemorepellent effect, indicating that chemotaxis is elicited in Tetrahymena only by ligands with optimal physicochemical characters (mass, conformation, etc.). The chemotactic selection data indicated that tuftsin-induced chemotaxis results from fairly short-term signalling in Tetrahymena.
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Affiliation(s)
- O Láng
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Nagyvárad tér 4. H-1089, Hungary
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Mezö G, Láng O, Jakab A, Bai KB, Szabó I, Schlosser G, Láng J, Köhidai L, Hudecz F. Synthesis of oligotuftsin-based branched oligopeptide conjugates for chemotactic drug targeting. J Pept Sci 2006; 12:328-36. [PMID: 16245264 DOI: 10.1002/psc.729] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The synthesis and chemotactic properties of a new class of branched oligopeptide-based conjugates are described. Tetratuftsin derivatives containing chemotactic formyl tripeptides (For-MLF, For-NleLF or For-MMM) in branches were prepared by stepwise solid-phase peptide synthesis. The influence of the composition and ionic charge of the carrier-branched oligopeptide on the chemotactic behaviour of the conjugate was studied in Tetrahymena pyriformis. Conjugates with methotrexate (Mtx) as a drug component was also prepared. For this, a GFLGC spacer, cleavable by cathepsin B, was used. The spacer with N-terminal methotrexate was coupled to the chloroacetylated chemotactic carrier molecule by thioether bond formation. The chemotactic activity and cytotoxity of Mtx conjugates were also studied.
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Affiliation(s)
- Gábor Mezö
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös L. University, 1518 Budapest, Hungary.
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Hauser P, Jakab Z, Láng O, Kondás O, Müller J, Schuler D, Bognár L, Garami M. Incidence and survival of central nervous system involvement in childhood malignancies: Hungarian experience. J Pediatr Hematol Oncol 2005; 27:125-8. [PMID: 15750442 DOI: 10.1097/01.mph.0000155119.12818.7e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Direct extension and hematogenous metastasis of primary non-CNS malignant tumors to the CNS are rare complications in children. The authors analyzed the incidence and outcome of these complications in Hungary. During a 14-year period between 1989 and 2002, 406 patients younger than 18 years were studied at Semmelweis University, Second Department of Pediatrics, in Budapest. Among the 406 patients with non-CNS solid tumors, nine hematogenous metastases and five direct tumor extensions to the CNS occurred. Primary tumors included rhabdomyosarcoma, neuroblastoma, tumors of the Ewing sarcoma family, non-Hodgkin lymphoma, and malignant chordoma. Mean interval between the initial diagnosis and the diagnosis of CNS involvement was 11.4 months. Despite intensive treatment, the mean survival after detection of CNS involvement was 10.4 months. The frequency of CNS involvement in non-CNS tumors is low, with a very poor survival.
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Affiliation(s)
- Péter Hauser
- Second Department of Pediatrics, Semmelweis University, Budapest, Hungary.
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Kohidai L, Török K, Illyés E, Tamási J, Sebestyén F, Láng O, Csaba G, Hudecz F. Characterization of chemotactic ability of peptides containing N-formyl-methionyl residues in Tetrahymena fMLP as a targeting ligand. Cell Biol Int 2004; 27:695-700. [PMID: 12867161 DOI: 10.1016/s1065-6995(03)00126-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The chemotactic effects of six formylated, putatively bacterial peptides (fMLP, fMLPP, fMMM, fMP, fMV, and fMS) were studied. From the set of six peptides, only fMLP (one of the most effective chemoattractant peptides in mammals) elicited a significant positive chemotactic response in the eukaryotic ciliate Tetrahymena pyriformis, while the other formylated ligands, e.g. fMMM (which is also effective in mammals), had neutral or antagonistic effects in Tetrahymena. A study of their amino acid sequences points to an, as yet obscure, interaction between C-terminal f-Met and N-terminal aromatic Phe. Some optimal physicochemical characteristics (e.g. solvent exposed area, solubility) of the molecule may be responsible for this special feature of f-MLP at such a low level of phylogeny. This means that the unicellular Tetrahymena is able to select between related molecules, giving high priority to the molecule that is the most chemoattractive in mammals. The results call attention to the possible presence of f-Met receptors at a unicellular level and to the evolutionary conservation of chemotaxis-activating processes.
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Affiliation(s)
- László Kohidai
- Department of Genetics, Cell and Immunobiology, Semmelweis University of Medicine, Nagyvarad ter 4 POB 370, 1445, Budapest, Hungary
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Mezö G, Kalászi A, Reményi J, Majer Z, Hilbert A, Láng O, Köhidai L, Barna K, Gaál D, Hudecz F. Synthesis, conformation, and immunoreactivity of new carrier molecules based on repeated tuftsin-like sequence. Biopolymers 2004; 73:645-56. [PMID: 15048768 DOI: 10.1002/bip.20024] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Sequential oligopeptides based on a pentapeptide (TKPKG) derived from tuftsin with different lengths were synthesized by stepwise solid phase methodology. These highly soluble oligomers were nontoxic on mouse spleen cells, and other biological data suggested that tuftsin-like properties were also presented. The (TKPKG)n (n=2,4,6,8) oligopeptides were not immunogenic; however, they increased sheep red blood cells (SRBC) antigen specific antibody response in mice, demonstrating their immunostimulatory effect. Chemotactic activity was also found on J774 monocyte cells, while MRC5 fibroblasts were chemotactically nonresponders to the tested forms of tuftsin. These oligomers showed unordered and flexible structure by CD measurements, confirmed by computer modeling studies indicating also a fairly good accessibility of the epsilon-amino group of each lysine residue. Data suggest that these new oligotuftsin derivatives can be considered as promising carriers for synthetic vaccine.
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Affiliation(s)
- Gábor Mezö
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös L. University, Budapest, Hungary.
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Hauser P, Jakab Z, Láng O, Kondás O, Török S, Garami M, Bognár L, Schuler D. High incidence of brain tumors of childhood in Hungary between 1989 and 2001. ACTA ACUST UNITED AC 2003; 41:590-1. [PMID: 14595728 DOI: 10.1002/mpo.10438] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Péter Hauser
- Semmelweis University, Budapest, Faculty of General Medicine, 2nd Department of Pediatrics, Budapest, Hungary
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Köhidai L, Bösze S, Soós P, Illyés E, Láng O, Mák M, Sebestyen F, Hudecz F. Chemotactic activity of oligopeptides containing an EWS motif on Tetrahymena pyriformis: the effect of amidation of the C-terminal residue. Cell Biochem Funct 2003; 21:113-20. [PMID: 12736899 DOI: 10.1002/cbf.1005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Chemotactic properties of 3-7-mer peptides containing an EWS motive and their peptide amides synthesized and characterized by us were investigated in Tetrahymena pyriformis GL model. Analysis of the peptide acids shows that SEWS possesses exceptionally strong (660%+/-21; 430%+/-18) chemoattractant ability at 10(-12) and 10(-11) m respectively. The shorter peptide (EWS) possesses chemorepellent activity, while longer peptides display neutral (WSEWS) or moderate chemoattractant (EWSEWS and GEWSEWS) chemotactic ability. Amidation of the C-terminus can significantly modify the character of peptides: it points to the conclusion that a free alpha-COOH group at this position is required for the high efficiency of SEWS, while in the shorter (EWS) and longer peptides (WSEWS and EWSEWS) amidation can result in chemoattractant ligands. Evaluation of the structure-function relationship of these compounds establishes the significance of Glu (E) with its high surface-exposed area and negatively-charged side chain. The high discriminative ability and good chemotactic responsiveness of Tetrahymena support the theory that a chemotactic signalling mechanism working in higher levels of phylogeny is a well conserved and inducible one even in protozoa.
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Affiliation(s)
- László Köhidai
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Nagyvárad tér 4, H-1089, Hungary
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Köhidai L, Láng O, Csaba G. Chemotactic-range-fitting of amino acids and its correlations to physicochemical parameters in Tetrahymena pyriformis--evolutionary consequences. Cell Mol Biol (Noisy-le-grand) 2003; 49 Online Pub:OL487-95. [PMID: 14995080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Amino acids are considered the oldest organic substances of the prebiotic evolution. Chemotactic effects of amino acid L-isomers investigated in the protozoan model Tetrahymena show that the chemotactic properties of amino acids are complex and depend on multiple physicochemical characteristics of the investigated ligands. The range of effectiveness is significantly wider for chemoattractant ligands than for chemorepellent ones. This phenomenon provides the basis of the "chemotactic-range-fitting" theory. The validity of this theory is supported by a decreased pK (-COOH), an increased pK (-NH2), and a decrease in solvent exposed areas and hydropathy indexes in chemoattractant amino acids compared to chemorepellent ones. Chemotactic selection has proven the activity of long-term (I, H, T) and short-term (P, A, Q, S) selector amino acids and their characteristic diversities in values of the pK and SEA (surface exposed area). Comprehensive studies of the chemotaxis data with the results of consensus analysis of amino acids suggests that chemotactic activity was one of the most primordial physiological activities and had a prospective significance not only in the molecular evolution of ligands, but also in the evolution of signalling.
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Affiliation(s)
- L Köhidai
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Nagyvárad tér 4. Budapest, 1089 Hungary
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Láng O, Kondás O, Török S, Hauser P, Bognár L, Schuler D. [Incidence of pediatric brain tumors in Hungary between 1989 and 1999]. Orv Hetil 2002; 143:451-4. [PMID: 12013686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
INTRODUCTION The incidence of primary brain tumors in childhood has increased all over the world in the last decades, so it is the second most frequent tumor after leukaemias. AIMS OF THE STUDY The aim of this study was to examine the incidence and relative frequency of central nervous system tumors diagnosed under 15 years of age in Hungary. METHODS The data obtained from the Hungarian Pediatric Oncology Group and the National Neurosurgical Institute between 1989 and 1998, and the reports of the head pediatricians of the counties were used. RESULTS There were 685 reported cases between 1989 and 1998. The prevalence of cerebral tumors has increased during the last decade in Hungary like that in several developed countries. The increase of the incidence of primary central nervous system tumors in the last ten years was 4.2% per year. In 1998 the incidence of central nervous system tumors was 42.9 cases per million children. The most frequent histological categories were: astrocytoma (30%), medulloblastoma/primitive neuroectodermal tumors (21%), ependymoma (9%) and other tumors (40%). CONCLUSION The results suggest an increase in the incidence of primary brain tumors in Hungary, similar to those reported in several countries.
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Affiliation(s)
- Orsolya Láng
- Altalános Orvostudományi Kar, II. sz. Gyermekgyógyászati Klinika, Semmelweis Egyetem, Budapest
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Illyés E, Hudecz F, Köhidai L, Láng O, Szabó P, Sebestyén F. Synthesis of oligopeptides with the sequence SXWS and their chemotactic effects on a ciliated protozoan Tetrahymena pyriformis. J Pept Sci 2002; 8:13-22. [PMID: 11831559 DOI: 10.1002/psc.363] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In this paper, the solid phase synthesis and chemical characterization of members of an SXWS sub-library (SAWS, SDWS and SKWS) as well as the comparison of their chemotactic properties with those of SEWS, which exhibits a prominent effect at 10(-12) M on a ciliated protozoan, Tetrahymena pyriformis, are described. We found that the chemotaxis of cells induced with the SXWS peptides varied according to the nature of the amino acid residue (Ala, Asp, Lys) in position X. The chemotactic activity of SEWS was not surpassed by any of three new tetrapeptides, although SAWS was also chemoattractant. Interestingly, SDWS, with an acidic side chain at position X, could not elicit any chemotactic response. SKWS, however, showed mild but significant chemorepellent activity over a wide concentration range. Chemotactic selection studies showed that the two chemoattractant peptides (SAWS and SEWS) had an expressed ability to select high-responder offspring cell populations. Peptides with neutral (SDWS) or chemorepellent (SKWS) properties were not able to select such subpopulations from the mixed cultures of Tetrahymena, indicating that the chemotactic response elicited by SXWS peptides is ligand-specific. For ligand-binding experiments N-terminally labelled fluorescent derivatives of SXWS peptides were prepared. applying [4-[7-hydroxycoumaryl]]acetic acid (Hca-OH) or 4-ethoxymethylene-2-[1]-naphthyl-5(4H)-oxazolone (naOx-OEt) as markers. Hca-OH was introduced using an active ester technique as the last step of SPPS, or after cleavage in solution. The oxazolone naOx-OEt reacted with the amino group of the peptide by liberation of EtOH. The binding characteristics of fixed Tetrahymena cells with the naOx-labelled peptides showed good correlation between binding profiles and chemotactic responsiveness (SEWS > SAWS > SDWS - SKWS). A similar binding pattern was observed in the case of Hca-peptides (SEWS > SAWS > SDWS). Hca-SKWS, however, bound remarkably to the cell surface. The binding activity of the Hca-peptides was less pronounced than that of the naOx-peptides, indicating the importance of the fluorophores applied.
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Affiliation(s)
- Eszter Illyés
- Department of Organic Chemistry, Eötvös Loránd University, Budapest, Hungary
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