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Altendorf S, Ferholz M, Geyfman M, Poloso N, Jiménez F, Erdmann H, Bíró T, Paus R. 564 Vertex and Occipital Intermediate and Terminal Hair Follicles from Androgenetic Alopecia Patients are Differentially Affected by Testosterone Ex Vivo. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.09.580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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van Lessen M, Mardaryev A, Chéret J, Bertolini M, Edelkamp J, Bíró T, Paus R. 540 A Novel Ex Vivo Assay Platform to Pre-Clinically Evaluate Candidate Hypo- or Hyperpigmentation-Inducing Agents in Human Epidermis. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.09.555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Gherardini J, Rouille T, Ferholz M, Funk W, Rodríguez-Feliz J, Bauman A, Bíró T, Chéret J, Paus R. 571 Human Hair Follicles can “Taste”: Stimulation of the Bitter Taste Receptor TAS2R4 Inhibits Hair Growth Ex Vivo by Up-Regulating TGF-β2. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.09.587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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van Lessen M, Mardaryev A, Mauri C, Broadley D, Bertolini M, Edelkamp J, Paus R, Bíró T. 842 Novel human skin organ culture models for the identification and characterization of anti-aging actives ex vivo. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Broadley D, van Lessen M, Takeoka A, Arai R, Suzuki K, Abe A, Nagahama T, Takaoka A, Funk W, Erdmann H, Bíró T, Bertolini M. 640 Exploring the synergic effects of a plant and a peptide on hair follicle pigmentation. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Fehrholz M, Piccini I, Timperi L, Mardaryev A, Pinto D, Rinaldi F, Paus R, Bíró T, Bertolini M. 731 Generation of a laser capture microdissection and RNAseq-based human anagen hair follicle transcriptome atlas. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Gherardini J, Rouille T, Fehrholz M, Funk W, Rodriguez-Feliz J, Bauman A, Bíró T, Chéret J, Paus R. 743 Hair follicles can “taste”: Stevioside stimulation of the bitter taste receptor, TAS2R4, inhibits human hair growth ex vivo. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Knisz J, Shetty P, Wirth R, Maróti G, Karches T, Dalkó I, Bálint M, Vadkerti E, Bíró T. Genome-level insights into the operation of an on-site biological wastewater treatment unit reveal the importance of storage time. Sci Total Environ 2021; 766:144425. [PMID: 33418265 DOI: 10.1016/j.scitotenv.2020.144425] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 12/07/2020] [Accepted: 12/08/2020] [Indexed: 06/12/2023]
Abstract
On-site wastewater treatment systems are gaining popularity in areas where centralized wastewater treatment is not available. In the current case study a domestic activated sludge system was investigated, where treated effluent was stored in a short-term (1 week turn-over time) and a long-term (over 2-3 months) storage tank and was then used for irrigation. This design provided a unique opportunity to assess the chemical and microbial changes of the effluent upon storage. Long-term storage greatly improved both the chemical quality and the degradation efficiency of most organic micropollutants examined, including petroleum hydrocarbons and the pesticide diethyltoluamide. Taxonomic profile of the core microbiome of the effluent was also influenced upon storage. Relative abundance values of the members of Azoarcus and Thauera genera, which are important in degrading polycyclic aromatic hydrocarbons compounds, clearly indicated the biodegrading activity of these microbes across samples. The abundance of xenobiotics degradation functions correlated with the observed organic micropollutant degradation values indicating efficient microbial decomposition of these contaminants. Functions related to infectious diseases also had the highest abundance in the short-term storage tank corresponding well with the relative abundance of indicator organisms and implying to the significance of storage time in the elimination of pathogens. Based on these results, small, on-site wastewater treatment systems could benefit from long-term storage of wastewater effluent.
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Affiliation(s)
- J Knisz
- Faculty of Water Sciences, National University of Public Service, Bajcsy-Zsilinszky u. 12-14., 6500 Baja, Hungary
| | - P Shetty
- Institute of Plant Biology, Biological Research Center, Temesvári krt. 62, 6726 Szeged, Hungary
| | - R Wirth
- Institute of Plant Biology, Biological Research Center, Temesvári krt. 62, 6726 Szeged, Hungary
| | - G Maróti
- Faculty of Water Sciences, National University of Public Service, Bajcsy-Zsilinszky u. 12-14., 6500 Baja, Hungary; Institute of Plant Biology, Biological Research Center, Temesvári krt. 62, 6726 Szeged, Hungary
| | - T Karches
- Faculty of Water Sciences, National University of Public Service, Bajcsy-Zsilinszky u. 12-14., 6500 Baja, Hungary
| | - I Dalkó
- Faculty of Water Sciences, National University of Public Service, Bajcsy-Zsilinszky u. 12-14., 6500 Baja, Hungary
| | - M Bálint
- Bálint Analitika Ltd, Fehérvári út 144, 1116 Budapest, Hungary
| | - E Vadkerti
- Faculty of Water Sciences, National University of Public Service, Bajcsy-Zsilinszky u. 12-14., 6500 Baja, Hungary
| | - T Bíró
- Faculty of Water Sciences, National University of Public Service, Bajcsy-Zsilinszky u. 12-14., 6500 Baja, Hungary.
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Tóth K, Ádám D, Arany J, Faragó P, Arbiser J, Zouboulis C, Bíró T, Oláh A. 607 The putative tribbles homolog 3 (TRIB3) activator honokiol suppresses lipogenesis, and exerts anti-proliferative as well as anti-inflammatory effects on human sebocytes. J Invest Dermatol 2019. [DOI: 10.1016/j.jid.2019.07.611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Medgyesi B, Béke G, Kapitány A, Janka E, Gáspár K, Szabó I, Bíró T, Szegedi A, Dajnoki Z. 224 Revealing Barrier Alterations in Rosacea Skin at the Molecular Level. J Invest Dermatol 2019. [DOI: 10.1016/j.jid.2019.07.225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Jenei A, Dajnoki Z, Medgyesi B, Gáspár K, Béke G, Kinyó Á, Méhes G, Hendrik Z, Dinya T, Törőcsik D, Zouboulis CC, Prens EP, Bíró T, Szegedi A, Kapitány A. Apocrine Gland-Rich Skin Has a Non-Inflammatory IL-17-Related Immune Milieu, that Turns to Inflammatory IL-17-Mediated Disease in Hidradenitis Suppurativa. J Invest Dermatol 2018; 139:964-968. [PMID: 30391261 DOI: 10.1016/j.jid.2018.10.020] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 09/27/2018] [Accepted: 10/22/2018] [Indexed: 12/20/2022]
Affiliation(s)
- A Jenei
- Division of Dermatological Allergology, Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Z Dajnoki
- Division of Dermatological Allergology, Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - B Medgyesi
- Division of Dermatological Allergology, Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - K Gáspár
- Division of Dermatological Allergology, Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - G Béke
- Division of Dermatological Allergology, Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Á Kinyó
- Department of Dermatology, Venereology, and Oncodermatology, University of Pécs, Pécs, Hungary
| | - G Méhes
- Department of Pathology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Z Hendrik
- Department of Pathology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - T Dinya
- Department of Surgery, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - D Törőcsik
- Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - C C Zouboulis
- Departments of Dermatology, Venereology, Allergology, and Immunology, Dessau Medical Center, Brandenburg Medical School Theodor Fontane, Dessau, Germany
| | - E P Prens
- Department of Dermatology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - T Bíró
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - A Szegedi
- Division of Dermatological Allergology, Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - A Kapitány
- Division of Dermatological Allergology, Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; Department of Dermatology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.
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12
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Alimohammadi S, Gyetvai, Pénzes Z, Guba D, Bíró T, Szöllsi A. 965 Expression and role pruritic receptors on monocyte-derived Langerhans cells. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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13
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Dajnoki Z, Béke G, Kapitány A, Gáspár K, Póliska S, Hendrik Z, Péter Z, Törcsik D, Bíró T, Szegedi A. 720 Topographical differences in immune and barrier functions of human skin. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Tóth K, Markovics A, Angyal, Magi J, Pór, Kovács I, Zouboulis C, Bíró T, Oláh A. 1321 Endocannabinoid-like molecule oleoylethanolamide promotes sebaceous lipid synthesis. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.1338] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tóth K, Szabó-Papp J, Kilic A, Soeberdt M, Abels C, Bíró T, Oláh A. 126 The selective serotonin reuptake inhibitor fluoxetine exerts anti-inflammatory actions on human epidermal keratinocytes. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.436] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Szabó I, Herczeg-Lisztes E, Szollosi A, Szegedi A, Bíró T, Oláh A. 263 (-)-cannabidiol differentially influences hair growth. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Mihaly J, Miltner N, Tubak V, Mechoulam R, Russo E, Bíró T. 460 Assessment of the anti-inflammatory effects of fluorinated semi-synthetic phytocannabinoids in human in vitro inflammatory keratinocyte model systems. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Oláh A, Alam M, Chéret J, Kis G, Hegyi Z, Szántó M, Bai P, Lerchner J, Bíró T, Paus R. 101 Cannabinoid receptor 1 (CB1) is a novel negative regulator of keratinocyte mitochondrial function in human epidermis ex vivo. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Szabó K, Erdei L, Bolla BS, Tax G, Bíró T, Kemény L. Factors shaping the composition of the cutaneous microbiota. Br J Dermatol 2017; 176:344-351. [PMID: 27518483 DOI: 10.1111/bjd.14967] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/03/2016] [Indexed: 12/12/2022]
Abstract
From birth, we are constantly exposed to bacteria, fungi and viruses, some of which are capable of transiently or permanently inhabiting our different body parts as our microbiota. The majority of our microbial interactions occur during and after birth, and several different factors, including age, sex, genetic constitution, environmental conditions and lifestyle, have been suggested to shape the composition of this microbial community. Propionibacterium acnes is one of the most dominant lipophilic microbes of the postadolescent, sebum-rich human skin regions. Currently, the role of this bacterium in the pathogenesis of the most common inflammatory skin disease, acne vulgaris, is a topic of intense scientific debate. Recent results suggest that Westernization strongly increases the dominance of the Propionibacterium genus in human skin compared with natural populations living more traditional lifestyles. According to the disappearing microbiota hypothesis proposed by Martin Blaser, such alterations in the composition of our microbiota are the possible consequences of socioeconomic and lifestyle changes occurring after the industrial revolution. Evanescence of species that are important elements of the human ecosystem might lead to the overgrowth and subsequent dominance of others because of the lack of ecological competition. Such changes can disturb the fine-tuned balance of the human body and, accordingly, our microbes developed through a long co-evolutionary process. These processes might lead to the transformation of a seemingly harmless species into an opportunistic pathogen through bacterial dysbiosis. This might have happened in the case of P. acnes in acne pathogenesis.
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Affiliation(s)
- K Szabó
- MTA-SZTE Dermatological Research Group, Szeged, Hungary
| | - L Erdei
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - B Sz Bolla
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - G Tax
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - T Bíró
- DE-MTA 'Lendület' Cellular Physiology Research Group, Departments of Physiology and Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - L Kemény
- MTA-SZTE Dermatological Research Group, Szeged, Hungary.,Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
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Kovacs D, Lovászi M, Zouboulis C, Bíró T, Oláh A, Ståhle M, Remenyik É, Töröcsik D. 414 Identification of sebocytes as a novel source for adipokines within human skin. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.06.434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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21
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Oláh A, Zákány N, Markovics A, Nicolussi S, Gertsch J, Piscitelli F, Di Marzo V, Pór Á, Zouboulis C, Bíró T. 196 The endocannabinoid tone regulates human sebocyte biology. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.06.215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Mihály J, Angyal Á, Bánhalminé Szilágyi S, Tubak V, Soeberdt M, Abels C, Oláh A, Bíró T. 303 Establishment and optimization of pro-inflammatory model systems in human keratinocytes. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.06.323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bertolini M, Pretzlaff M, Sulk M, Bähr M, Gherardini J, Uchida Y, Reibelt M, Kinori M, Rossi A, Bíró T, Paus R. Vasoactive intestinal peptide, whose receptor-mediated signalling may be defective in alopecia areata, provides protection from hair follicle immune privilege collapse. Br J Dermatol 2016; 175:531-41. [PMID: 27059672 DOI: 10.1111/bjd.14645] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/21/2016] [Indexed: 12/20/2022]
Abstract
BACKGROUND Alopecia areata (AA) is an autoimmune disorder whose pathogenesis involves the collapse of the relative immune privilege (IP) of the hair follicle (HF). Given that vasoactive intestinal peptide (VIP) is an immunoinhibitory neuropeptide released by perifollicular sensory nerve fibres, which play a role in IP maintenance, it may modulate human HF-IP and thus be therapeutically relevant for AA. OBJECTIVES To answer the following questions: Do human HFs express VIP receptors, and does their stimulation protect from or restore experimentally induced HF-IP collapse? Is VIP signalling defective in AA HFs? METHODS Firstly, VIP and VIP receptor (VPAC1, VPAC2) expression in human scalp HFs and AA skin was assessed. In HF organ culture, we then explored whether VIP treatment can restore and/or protect from interferon-γ-induced HF-IP collapse, assessing the expression of the key IP markers by quantitative (immuno-)histomorphometry. RESULTS Here we provide the first evidence that VIP receptors are expressed in the epithelium of healthy human HFs at the gene and protein level. Furthermore, VIP receptor protein expression, but not VIP(+) nerve fibres, is significantly downregulated in lesional hair bulbs of patients with AA, suggesting defects in VIP receptor-mediated signalling. Moreover, we show that VIP protects the HF from experimentally induced IP collapse in vitro, but does not fully restore it once collapsed. CONCLUSIONS These pilot data suggest that insufficient VIP receptor-mediated signalling may contribute to impairing HF-IP in patients with AA, and that VIP is a promising candidate 'HF-IP guardian' that may be therapeutically exploited to inhibit the progression of AA lesions.
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Affiliation(s)
- M Bertolini
- Department of Dermatology, University of Münster, Münster, Germany.
| | - M Pretzlaff
- Department of Dermatology, University of Lübeck, Lübeck, Germany
| | - M Sulk
- Department of Dermatology, University of Münster, Münster, Germany
| | - M Bähr
- Department of Dermatology, University of Lübeck, Lübeck, Germany
| | - J Gherardini
- Department of Dermatology, University of Münster, Münster, Germany
| | - Y Uchida
- Department of Dermatology, University of Münster, Münster, Germany.,Department of Dermatology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - M Reibelt
- Department of Dermatology, University of Lübeck, Lübeck, Germany
| | - M Kinori
- Department of Ophthalmology, Sheba Medical Center, Tel Hashomer, Israel
| | - A Rossi
- Department of Internal Medicine and Medical Specialties, University 'La Sapienza', Rome, Italy
| | - T Bíró
- DE-MTA 'Lendület' Cellular Physiology Research Group, Departments of Immunology and Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - R Paus
- Department of Dermatology, University of Münster, Münster, Germany.,Centre for Dermatology Research, Institute of Inflammation and Repair, University of Manchester, Manchester, U.K
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Kovács A, Bordás C, Bíró T, Hegyi Z, Antal M, Szücs P, Pál B. Direct presynaptic and indirect astrocyte-mediated mechanisms both contribute to endocannabinoid signaling in the pedunculopontine nucleus of mice. Brain Struct Funct 2016; 222:247-266. [DOI: 10.1007/s00429-016-1214-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 03/06/2016] [Indexed: 12/20/2022]
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Szabó T, Ambrus L, Zákány N, Balla G, Bíró T. Regulation of TRPC6 ion channels in podocytes - Implications for focal segmental glomerulosclerosis and acquired forms of proteinuric diseases. ACTA ACUST UNITED AC 2015; 102:241-51. [PMID: 26551740 DOI: 10.1556/036.102.2015.3.2] [Citation(s) in RCA: 7] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The glomerular filtration barrier is a highly specialized tri-layer structure with unique functional properties. Podocyte dysfunction and cytoskeletal disorganization leads to disruption of the slit diaphragma, and proteinuria. Inflammatory diseases involving the kidney as well as inherited podocytopathies or diabetic nephropathy cause injury of the podocyte network. Focal segmental glomerulosclerosis (FSGS) is a pathologic entity that is a common cause of nephrotic syndrome with severe proteinuria in both adults and children. Several causative genes have been identified in the pathogenesis of FSGS. Mutations of the transient receptor potential canonical-6 (TRPC6), a non-selective cation channel that is directly activated by diacylglycerol (DAG), cause a particularly aggressive form of FSGS. Angiotensin II, acting through its AT1 receptor, plays a critical role in generation of proteinuria and progression of kidney injury in a number of kidney diseases, including FSGS. Mounting evidence suggest the central role of TRPC6 and perhaps other TRPC channels in the pathogenesis of FSGS as well as of acquired forms of proteinuria such as diabetic nephropathy or hypertension. Identification of signaling pathways downstream of TRPC6 may provide novel targets for the treatment of proteinuria and prevent progression of podocyte injury.
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Affiliation(s)
- T Szabó
- Department of Pediatrics, Medical Faculty, University of Debrecen , Debrecen , Hungary
| | - L Ambrus
- DE-MTA "Lendület" Cellular Physiology Research Group, Department of Physiology, Medical Faculty, University of Debrecen , Debrecen , Hungary
| | - N Zákány
- DE-MTA "Lendület" Cellular Physiology Research Group, Department of Physiology, Medical Faculty, University of Debrecen , Debrecen , Hungary
| | - Gy Balla
- Department of Pediatrics, Medical Faculty, University of Debrecen , Debrecen , Hungary
| | - T Bíró
- DE-MTA "Lendület" Cellular Physiology Research Group, Department of Physiology, Medical Faculty, University of Debrecen , Debrecen , Hungary
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Bíró T. Human sebocytes: the new leptin connection? Br J Dermatol 2014; 171:1288. [PMID: 25523251 DOI: 10.1111/bjd.13397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- T Bíró
- DE-MTA 'Lendület' Cellular Physiology Research Group, Department of Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.
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Mócsai G, Gáspár K, Nagy G, Irinyi B, Kapitány A, Bíró T, Gyimesi E, Tóth B, Maródi L, Szegedi A. Severe skin inflammation and filaggrin mutation similarly alter the skin barrier in patients with atopic dermatitis. Br J Dermatol 2014; 170:617-24. [PMID: 24251354 DOI: 10.1111/bjd.12743] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/14/2013] [Indexed: 01/19/2023]
Abstract
BACKGROUND Filaggrin (FLG) deficiency is a well-known predisposing factor for the development of atopic dermatitis (AD). Decreased FLG expression can be the result of haploinsufficiency or severe inflammation, which can cause acquired FLG alterations. FLG mutations are related to several clinical and laboratory parameters of AD; however, some recent data seem to contradict these associations. OBJECTIVES Our aim was to determine which clinical and biochemical parameters are connected to FLG haploinsufficiency and which ones are also associated with acquired FLG alterations due to severe skin symptoms in patients with AD. METHODS We introduced a novel classification of patients with AD, based on FLG mutations and SCORAD (SCORing Atopic Dermatitis). Based on these parameters, we created three groups of patients with AD: mild-to-moderate wild-type (A), severe wild-type (B) and severe mutant (C). In all groups, we assessed laboratory and clinical parameters and performed immunohistochemical analyses. RESULTS Groups B and C contained patients with equally severe symptoms based on the SCORAD. The two severe groups did not differ significantly with respect to barrier-specific parameters, whereas group A had significantly better results for the barrier function measurements. However, significant differences were detected between groups B and C with respect to the allergic sensitization-specific parameters. CONCLUSIONS These findings suggest that skin barrier function correlates with the severity of skin inflammation and can be equally impaired in patients with FLG mutant- and wild-type AD with severe symptoms. Nevertheless, our results also suggest that patients with FLG mutant-type AD may have a higher risk of allergic sensitization compared with patients with the wild-type.
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Affiliation(s)
- G Mócsai
- Department of Dermatology, Medical and Health Science Center, University of Debrecen, 98 Nagyerdei krt, Debrecen, 4032, Hungary; Department of Dermatological Allergology, Medical and Health Science Center, University of Debrecen, 98 Nagyerdei krt, Debrecen, 4032, Hungary
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Fischer TW, Herczeg-Lisztes E, Funk W, Zillikens D, Bíró T, Paus R. Differential effects of caffeine on hair shaft elongation, matrix and outer root sheath keratinocyte proliferation, and transforming growth factor-β2/insulin-like growth factor-1-mediated regulation of the hair cycle in male and female human hair follicles in vitro. Br J Dermatol 2014; 171:1031-43. [PMID: 24836650 DOI: 10.1111/bjd.13114] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/06/2014] [Indexed: 12/11/2022]
Abstract
BACKGROUND Caffeine reportedly counteracts the suppression of hair shaft production by testosterone in organ-cultured male human hair follicles (HFs). OBJECTIVES We aimed to investigate the impact of caffeine (i) on additional key hair growth parameters, (ii) on major hair growth regulatory factors and (iii) on male vs. female HFs in the presence of testosterone. METHODS Microdissected male and female human scalp HFs were treated in serum-free organ culture for 120 h with testosterone alone (0·5 μg mL(-1)) or in combination with caffeine (0·005-0·0005%). The following effects on hair shaft elongation were evaluated by quantitative (immuno)histomorphometry: HF cycling (anagen-catagen transition); hair matrix keratinocyte proliferation; expression of a key catagen inducer, transforming growth factor (TGF)-β2; and expression of the anagen-prolonging insulin-like growth factor (IGF)-1. Caffeine effects were further investigated in human outer root sheath keratinocytes (ORSKs). RESULTS Caffeine enhanced hair shaft elongation, prolonged anagen duration and stimulated hair matrix keratinocyte proliferation. Female HFs showed higher sensitivity to caffeine than male HFs. Caffeine counteracted testosterone-enhanced TGF-β2 protein expression in male HFs. In female HFs, testosterone failed to induce TGF-β2 expression, while caffeine reduced it. In male and female HFs, caffeine enhanced IGF-1 protein expression. In ORSKs, caffeine stimulated cell proliferation, inhibited apoptosis/necrosis, and upregulated IGF-1 gene expression and protein secretion, while TGF-β2 protein secretion was downregulated. CONCLUSIONS This study reveals new growth-promoting effects of caffeine on human hair follicles in subjects of both sexes at different levels (molecular, cellular and organ).
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Affiliation(s)
- T W Fischer
- Department of Dermatology, University of Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Germany
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Ramot Y, Zhang G, Bíró T, Langbein L, Paus R. Is thyrotropin-releasing hormone a novel neuroendocrine modulator of keratin expression in human skin? Br J Dermatol 2013; 169:146-51. [DOI: 10.1111/bjd.12264] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/29/2013] [Indexed: 01/20/2023]
Affiliation(s)
- Y. Ramot
- Department of Dermatology; University of Lübeck; D-23538 Lübeck Germany
- Department of Dermatology; Hadassah-Hebrew University Medical Center; Jerusalem Israel
| | - G. Zhang
- Department of Dermatology; University of Lübeck; D-23538 Lübeck Germany
- Plastic Surgery Hospital; Chinese Academy of Medical Sciences and Peking Union Medical College; Beijing China
| | - T. Bíró
- Department of Physiology; Medical and Health Science Center; Research Center for Molecular Medicine; DE-MTA ‘Lendulet’ Cellular Physiology Research Group; University of Debrecen; Debrecen Hungary
| | - L. Langbein
- Division of Skin Carcinogenesis; German Cancer Research Center; Heidelberg Germany
| | - R. Paus
- Department of Dermatology; University of Lübeck; D-23538 Lübeck Germany
- Institute of Inflammation and Repair; University of Manchester and The Dermatology Center, Royal Salford Hospital; Manchester U.K
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Langan E, Lisztes E, Bíró T, Funk W, Kloepper J, Griffiths C, Paus R. Dopamine is a novel, direct inducer of catagen in human scalp hair folliclesin vitro. Br J Dermatol 2012; 168:520-5. [DOI: 10.1111/bjd.12113] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Nagy Z, Orosz E, Kovács I, Török M, Bíró T, Blumberg P, Czifra G. 381 Investigation of RasGRP3 Expression and Function in Human Breast Cancers and Breast-derived Ductal Adenocarcinoma Cell Lines. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)72179-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Miklós Z, Kemecsei P, Bíró T, Marincsák R, Tóth BI, Buijs J, Benis É, Drozgyik A, Ivanics T. Early cardiac dysfunction is rescued by upregulation of SERCA2a pump activity in a rat model of metabolic syndrome. Acta Physiol (Oxf) 2012; 205:381-93. [PMID: 22289164 DOI: 10.1111/j.1748-1716.2012.02420.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Revised: 10/26/2011] [Accepted: 01/23/2012] [Indexed: 12/22/2022]
Abstract
AIM Various components of metabolic syndrome associate with cardiac intracellular calcium (Cai 2+) mishandling, a precipitating factor in the development of heart failure. We aimed to provide a thorough description of early stage Cai 2+-cycling alterations in the fructose-fed rat, an experimental model of the disorder, where insulin resistance, hypertension and dyslipidaemia act cooperatively on the heart. METHOD Rats were fed with fructose-rich chow. After 6 weeks, echocardiography was performed, which was followed by measurements of myocardial Cai 2+ transients recorded by Indo-1 surface fluorometry in isolated perfused hearts. Sarcoplasmic reticulum (SR) Ca(2+) -ATPase (SERCA2a) activity was assessed by administration of its inhibitor cyclopiazonic acid (CPA). Mathematical model analysis of Cai 2+ transients was used to estimate kinetic properties of SR Ca(2+) transporters. Protein levels of key Ca(2+) handling proteins were also measured. RESULTS Echocardiography showed signs of cardiac hypertrophy, but in vivo and ex vivo haemodynamic performance of fructose-fed rat hearts were unaltered. However, a decline in Ca(2+) sequestration capacity (-dCai 2+/dt and decay time of Cai 2+ transients) was observed. Model estimation showed decreased affinity for Ca(2+) (higher K(m) ) and elevated V(max) for SERCA2a. Diseased hearts were more vulnerable to CPA application. Fructose feeding caused elevation in SERCA2a and phosphorylated phospholamban (PLB) expression, while total PLB level remained unchanged. CONCLUSION In early stage, metabolic syndrome primarily disturbs SERCA2a function in the heart, but consequential haemodynamic dysfunction is prevented by upregulation of SERCA2a protein level and phosphorylation pathways regulating PLB. However, this compensated state is very vulnerable to a further decline in SERCA2a function.
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Affiliation(s)
- Z. Miklós
- Institute of Human Physiology and Clinical Experimental Research; Semmelweis University; Budapest; Hungary
| | - P. Kemecsei
- Institute of Human Physiology and Clinical Experimental Research; Semmelweis University; Budapest; Hungary
| | - T. Bíró
- Department of Physiology; DE-MTA “Lendulet” Cellular Physiology Research Group; Debrecen; Hungary
| | - R. Marincsák
- Department of Physiology; DE-MTA “Lendulet” Cellular Physiology Research Group; Debrecen; Hungary
| | - B. I. Tóth
- Department of Physiology; DE-MTA “Lendulet” Cellular Physiology Research Group; Debrecen; Hungary
| | - J. Buijs
- MIRA Institute of Biomedical Technology and Technical Medicine (Control Engineering Group); University of Twente; Twente; the Netherlands
| | - É. Benis
- Institute of Human Physiology and Clinical Experimental Research; Semmelweis University; Budapest; Hungary
| | - A. Drozgyik
- Institute of Human Physiology and Clinical Experimental Research; Semmelweis University; Budapest; Hungary
| | - T. Ivanics
- Institute of Human Physiology and Clinical Experimental Research; Semmelweis University; Budapest; Hungary
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Griger Z, Tóth BI, Baráth S, Gyetvai Á, Kovács I, Tarr T, Bíró T, Zeher M, Sipka S. Different effects of bortezomib on the expressions of various protein kinase C isoenzymes in T cells of patients with systemic lupus erythematosus and in Jurkat cells. Scand J Immunol 2011; 75:243-8. [PMID: 21988336 DOI: 10.1111/j.1365-3083.2011.02647.x] [Citation(s) in RCA: 3] [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: 12/23/2022]
Abstract
The effects of proteosome inhibitor Bortezomib (BZ) were studied in vitro for 24 h on the protein kinase C (PKC) profiles, rates of proliferation and apoptosis in Jurkat cells and lymphocytes of 10 patients with systemic lupus erythematosus (SLE) and nine healthy subjects. The expressions of PKC proteins, the rates of proliferation and apoptosis were determined. The effects of BZ were different in the Jurkat and lupus T cells. Whereas BZ elevated the expression of PKC θ, δ and ξ isoenzymes in the Jurkat cells, it was unable to do that in the lupus T cells. BZ induced a dose-dependent increase in the apoptosis of Jurkat cells, while decreased the proliferation. The same effect of BZ was observed on the apoptosis of lymphocytes both in SLE and healthy subjects at concentrations higher than the therapeutic dose. We conclude that BZ treatment in vitro was not able to restore the SLE-specific defect (decrease) in the expression of PKC isoenzymes in the T cells as it was expected. This can be a limiting factor in the positive clinical effects of BZ in lupus.
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Affiliation(s)
- Z Griger
- Division of Clinical Immunology, 3rd Department of Internal Medicine, University of Debrecen, HungaryDepartment of Physiology, University of Debrecen, Hungary
| | - B I Tóth
- Division of Clinical Immunology, 3rd Department of Internal Medicine, University of Debrecen, HungaryDepartment of Physiology, University of Debrecen, Hungary
| | - S Baráth
- Division of Clinical Immunology, 3rd Department of Internal Medicine, University of Debrecen, HungaryDepartment of Physiology, University of Debrecen, Hungary
| | - Á Gyetvai
- Division of Clinical Immunology, 3rd Department of Internal Medicine, University of Debrecen, HungaryDepartment of Physiology, University of Debrecen, Hungary
| | - I Kovács
- Division of Clinical Immunology, 3rd Department of Internal Medicine, University of Debrecen, HungaryDepartment of Physiology, University of Debrecen, Hungary
| | - T Tarr
- Division of Clinical Immunology, 3rd Department of Internal Medicine, University of Debrecen, HungaryDepartment of Physiology, University of Debrecen, Hungary
| | - T Bíró
- Division of Clinical Immunology, 3rd Department of Internal Medicine, University of Debrecen, HungaryDepartment of Physiology, University of Debrecen, Hungary
| | - M Zeher
- Division of Clinical Immunology, 3rd Department of Internal Medicine, University of Debrecen, HungaryDepartment of Physiology, University of Debrecen, Hungary
| | - S Sipka
- Division of Clinical Immunology, 3rd Department of Internal Medicine, University of Debrecen, HungaryDepartment of Physiology, University of Debrecen, Hungary
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Langan E, Ramot Y, Hanning A, Poeggeler B, Bíró T, Gaspar E, Funk W, Griffiths C, Paus R. Thyrotropin-releasing hormone and oestrogen differentially regulate prolactin and prolactin receptor expression in female human skin and hair follicles in vitro. Br J Dermatol 2010; 162:1127-31. [DOI: 10.1111/j.1365-2133.2010.09676.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Marincsák R, Tóth BI, Czifra G, Márton I, Rédl P, Tar I, Tóth L, Kovács L, Bíró T. Increased expression of TRPV1 in squamous cell carcinoma of the human tongue. Oral Dis 2009; 15:328-35. [PMID: 19320840 DOI: 10.1111/j.1601-0825.2009.01526.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Recent reports have unambiguously identified the presence and the growth-modulatory role of transient receptor potential vanilloid-1 (TRPV1), a central integrator of pain sensation, on numerous non-neuronal cell types and, of great importance, in certain malignancies. In this study, we have investigated the molecular expression of TRPV1 in the human tongue and its high-incidence malignant (squamous cell carcinoma, SCC) and premalignant (leukoplakia) conditions. METHODS Immunohistochemistry, Western blotting and quantitative 'real-time' Q-PCR were performed to define the expression of TRPV1. RESULTS A weak and sparse TRPV1-specific immunoreactivity was identified in the basal layers of the healthy human tongue epithelium. By contrast, we observed a dramatically elevated TRPV1-immunoreactivity in all layers of the epithelium both in precancerous and malignant samples. Furthermore, statistical analysis revealed that the marked overexpression of TRPV1 found in all grades of SCC showed no correlation with the degree of malignancy of the tumours. Finally, the molecular expression of TRPV1 was also identified in an SCC-derived cell line and was shown to be increased in parallel with the accelerated growth of the cells. CONCLUSION Collectively, our findings identify TRPV1 as a novel, promising target molecule in the supportive treatment and diagnosis of human tongue SCC.
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Affiliation(s)
- R Marincsák
- Department of Physiology, University of Debrecen, Medical and Health Science Centre, Research Centre for Molecular Medicine, Debrecen, Hungary
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Bodó E, Bíró T, Telek A, Czifra G, Griger Z, Tóth IB, Lázár J, Meschalchin A, Ito T, Bettermann A, Pertile P, Kovács L, Paus R. A ‘hot’ new twist to hair biology - involvement of vanilloid receptor-1 signaling in human hair growth control. Exp Dermatol 2008. [DOI: 10.1111/j.0906-6705.2004.212bd.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Maksay G, Fodor L, Bíró T, Avlonitis N, Calogeropoulou T. A 17beta-derivative of allopregnanolone is a neurosteroid antagonist at a cerebellar subpopulation of GABA A receptors with nanomolar affinity. Br J Pharmacol 2007; 151:1078-86. [PMID: 17558438 PMCID: PMC2042931 DOI: 10.1038/sj.bjp.0707316] [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] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND AND PURPOSE High-affinity, subtype-selective antagonists of the neurosteroid binding sites of GABA(A) receptors are not available. We have characterized an allopregnanolone derivative as an antagonist of cerebellar GABA(A) receptors with nanomolar affinity. EXPERIMENTAL APPROACH Receptor binding and electrophysiological methods were used for the allosteric modulation of cerebellar GABA(A) receptors by an allopregnanolone derivative, (20R)-17beta-(1-hydroxy-2,3-butadienyl)-5alpha-androstane-3alpha-ol (HBAO). GABA(A) receptors of rat cerebellar membranes were labelled with the chloride channel blocker [(3)H]ethynylbicycloorthobenzoate (EBOB). The ionophore function of GABA(A) receptors was studied by whole-cell patch clamp electrophysiology in cultured rat cerebellar granule and cortical cells. KEY RESULTS Partial displacement of cerebellar [(3)H]EBOB binding by nanomolar HBAO was attenuated by 0.1 mM furosemide, an antagonist of alpha(6) and beta(2-3) subunit-containing GABA(A) receptors. Displacement curves of HBAO were reshaped by 30 nM GABA and shifted to the right. However, the micromolar potency of full displacement by allopregnanolone was not affected by 0.1 mM furosemide or 30 nM GABA. The nanomolar, but not the micromolar phase of displacement of [(3)H]EBOB binding by GABA was attenuated by 100 nM HBAO. Submicromolar HBAO did not affect [(3)H]EBOB binding to cortical and hippocampal GABA(A) receptors. HBAO up to 1 microM did not affect chloride currents elicited by 0.3-10 microM GABA, while it abolished potentiation by 1 microM allopregnanolone with nanomolar potency in cerebellar but not in cortical cells. Furosemide attenuated cerebellar inhibition by 100 nM HBAO. CONCLUSIONS AND IMPLICATIONS HBAO is a selective antagonist of allopregnanolone, a major endogenous positive modulator via neurosteroid sites of cerebellar (probably alpha(6)beta(2-3)delta) GABA(A) receptors.
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Affiliation(s)
- G Maksay
- Department of Molecular Pharmacology, Institute of Biomolecular Chemistry, Chemical Research Centre, Hungarian Academy of Sciences, H-1525 Budapest, Hungary.
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Fülöp L, Bányász T, Szabó G, Tóth IB, Bíró T, Lôrincz I, Balogh A, Petô K, Mikó I, Nánási PP. Effects of sex hormones on ECG parameters and expression of cardiac ion channels in dogs. Acta Physiol (Oxf) 2006; 188:163-71. [PMID: 17054656 DOI: 10.1111/j.1748-1716.2006.01618.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [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: 11/27/2022]
Abstract
AIM The aim of the study was to examine the effects of testosterone and oestrogen on the ECG parameters and expression of cardiac ion channels in male and female dogs, and to compare the dofetilide-induced lengthening of QTc interval in control, castrated and hormone-treated animals. METHODS ECG records were taken from male and female anaesthetized dogs (n = 10 in each group) before castration, after castration, and following inverted hormone substitution. The animals were challenged with dofetilide at each stage of the experiment. Finally, the hearts were excised and expression of ion channels was studied using Western blot technique. RESULTS Heart rate was decreased and PQ interval increased by deprivation of sex hormones in both genders (orchiectomy or ovarectomy), while inverted hormonal substitution restored control values. Orchiectomy significantly increased the duration of QT and QTc intervals, QTc-dispersion and the dofetilide-induced lengthening of QTc, while testosterone treatment of castrated females had opposite effects. Intraventricular conduction (QRS duration) was independent of the endocrine status of the animals. Ovarectomy or oestrogen treatment of castrated males failed to alter significantly these parameters except for QTc-dispersion. Expression of ion channel proteins responsible for mediation of I(K1) and I(to) currents (Kir2.1 and Kv4.3, respectively), was significantly higher in the testosterone-treated castrated females and normal males than in the oestrogen-treated castrated males and normal females. CONCLUSION Repolarization of canine ventricular myocardium is significantly modified by testosterone, but not oestrogen, in both genders. This effect is likely due to augmentation of expression of K(+)-channel proteins, and thus may provide protection against arrhythmias via increasing the repolarization reserve.
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Affiliation(s)
- L Fülöp
- Department of Cardiology, University Medical School, Debrecen, Hungary
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Havlickova B, Bíró T, Mescalchin A, Arenberger P, Paus R. Towards optimization of an organotypic assay system that imitates human hair follicle-like epithelial-mesenchymal interactions. Br J Dermatol 2004; 151:753-65. [PMID: 15491414 DOI: 10.1111/j.1365-2133.2004.06184.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [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: 11/30/2022]
Abstract
BACKGROUND Human hair growth can currently be studied in vitro by the use of organ-cultured scalp hair follicles (HFs). However, simplified organotypic systems are needed for dissecting the underlying epithelial-mesenchymal interactions and as screening tools for candidate hair growth-modulatory agents. OBJECTIVES To optimize the design and culture conditions of previously published organotypic systems that imitate epithelial-mesenchymal interactions in the human HF as closely as possible. MATERIALS AND METHODS Continuous submerged organotypic 'sandwich' cultures were established. These consist of a pseudodermis (collagen I mixed with and contracted by human interfollicular dermal fibroblasts) on which one of two upper layers is placed: either a mixture of Matrigel basement membrane matrix (BD Biosciences, Bedford, MA, U.S.A.) and follicular dermal papilla fibroblasts (DPC), with outer root sheath keratinocytes (ORSK) layered on the top ('layered' system), or a mixture of Matrigel, DPC and ORSK ('mixed' system). Morphological and functional characteristics of these 'folliculoid sandwiches' were then assessed by routine histology, histomorphometry and immunohistochemistry. RESULTS In both 'layered' and 'mixed' systems, the ORSK formed spheroid epithelial cell aggregates, which retained their characteristic keratin expression pattern (i.e. cytokeratin 6). In the 'mixed' sandwich model the size of the epithelial cell aggregates was smaller, but the numbers of ORSK were significantly higher than in the 'layered' model at day 14 in the culture. ORSK proliferated better in the 'mixed' than in the 'layered' sandwich system, regardless of the calcium or serum content of the media, whereas apoptosis of ORSK was lowest in the 'mixed' system in serum-free, low calcium medium. The kinetics of proliferation and apoptosis of DPC, which retained their characteristic expression of versican, were similar in both systems. However, proliferation and apoptosis of DPC were higher in the presence of serum and/or under high calcium conditions. CONCLUSIONS Our results underscore the importance of structural design and medium composition for epithelial-mesenchymal interactions as they occur in the human HF. Specifically, we report a new organotypic submerged 'folliculoid sandwich' system with serum-free, low calcium medium and a mixture of interacting human DPC and ORSK, which offers several advantages over previously available assays. This system allows the standardized assessment of the effects of a test agent on the proliferation, apoptosis and key marker expression of human ORSK and DPC under substantially simplified in vitro conditions which approximate the in vivo situation.
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Affiliation(s)
- B Havlickova
- Department of Dermatology, University Hospital Hamburg-Eppendorf, University of Hamburg, D-20246 Hamburg, Germany
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Bíró T, Griger Z, Kiss E, Papp H, Aleksza M, Kovács I, Zeher M, Bodolay E, Csépány T, Szûcs K, Gergely P, Kovács L, Szegedi G, Sipka S. Abnormal Cell-Specific Expressions of Certain Protein Kinase C Isoenzymes in Peripheral Mononuclear Cells of Patients with Systemic Lupus Erythematosus: Effect of Corticosteroid Application. Scand J Immunol 2004; 60:421-8. [PMID: 15379867 DOI: 10.1111/j.0300-9475.2004.01485.x] [Citation(s) in RCA: 9] [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: 11/29/2022]
Abstract
We have studied the expressions of various protein kinase C (PKC) isoenzymes in T cells and monocytes from patients with systemic lupus erythematosus (SLE), in comparison to those of healthy controls and patients with other immunological disorders. As measured by Western blotting, the levels of PKCbeta, delta, eta, epsilon, theta and zeta (but not of PKCalpha) significantly decreased in T cells of SLE patients. In monocytes, however, we observed marked suppressions only in the expressions of PKCdelta, epsilon and zeta but not in the expressions of other PKC isoforms. In vivo corticosteroid application, as well as in vitro steroid treatment of monocytes, elevated the expressions of most isoforms close to normal values; however, the decreased levels of PKCtheta and zeta were not affected by steroid application. These alterations were characteristic to SLE because we could not detect any changes in the PKC levels in mononuclear cells of primary Sjögren's syndrome and mixed connective tissue disease patients. These results suggest that impaired PKC isoenzyme pattern may exist in the T cells and monocytes of SLE patients. Furthermore, the clinically efficient glucocorticoid application in SLE can increase the expression of some members of PKC system.
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Affiliation(s)
- T Bíró
- Department of Physiology and Cell Physiology Research Group of the Hungarian Academy of Sciences, Debrecen, Hungary
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Rusznák Z, Pocsai K, Kovács I, Pór A, Pál B, Bíró T, Szücs G. Differential distribution of TASK-1, TASK-2 and TASK-3 immunoreactivities in the rat and human cerebellum. Cell Mol Life Sci 2004; 61:1532-42. [PMID: 15197476 DOI: 10.1007/s00018-004-4082-3] [Citation(s) in RCA: 27] [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: 10/26/2022]
Abstract
In this work, the distributions of some acid-sensitive two-pore-domain K+ channels (TASK-1, TASK-2 and TASK-3) were investigated in the rat and human cerebellum. Astrocytes situated in rat cerebellar tissue sections were positive for TASK-2 channels. Purkinje cells were strongly stained and granule cells and astrocytes were moderately positive for TASK-3. Astrocytes isolated from the hippocampus, cerebellum and cochlear nucleus expressed TASK channels in a primary tissue culture. Our results suggest that TASK channel expression may be significant in the endoplasmic reticulum of the astrocytes. The human cerebellum showed weak TASK-2 immunolabelling. The pia mater, astrocytes, Purkinje and granule cells demonstrated strong TASK-1 and TASK-3 positivities. The TASK-3 labelling was stronger in general, but it was particularly intense in the Purkinje cells and pia mater.
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Affiliation(s)
- Z Rusznák
- Department of Physiology, Medical and Health Science Centre, University of Debrecen, 4012 Debrecen, Hungary.
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Papp H, Czifra G, Bodó E, Lázár J, Kovács I, Aleksza M, Juhász I, Acs P, Sipka S, Kovács L, Blumberg PM, Bíró T. Opposite roles of protein kinase C isoforms in proliferation, differentiation, apoptosis, and tumorigenicity of human HaCaT keratinocytes. Cell Mol Life Sci 2004; 61:1095-105. [PMID: 15112056 DOI: 10.1007/s00018-004-4014-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [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: 11/28/2022]
Abstract
We have previously shown that the protein kinase C (PKC) system plays a pivotal role in regulation of proliferation and differentiation of the human keratinocyte line HaCaT which is often used to assess processes of immortalization, transformation, and tumorigenesis in human skin. In this paper, using pharmacological and molecular biology approaches, we investigated the isoform-specific roles of certain PKC isoenzymes (conventional cPKCalpha and beta; novel nPKCdelta and epsilon) in the regulation of various keratinocyte functions. cPKCalpha and nPKCdelta stimulated cellular differentiation and increased susceptibility of cells to actions of inducers of apoptosis, and they markedly inhibited cellular proliferation and tumor growth in immunodeficient mice. In marked contrast, cPKCbeta and nPKCepsilon increased both in vitro and in vivo growth of cells and inhibited differentiation and apoptosis. Our data present clear evidence for the specific, antagonistic roles of certain cPKC and nPKC isoforms in regulating the above processes in human HaCaT keratinocytes.
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Affiliation(s)
- H Papp
- Department of Physiology, University of Debrecen, Nagyerdei krt. 98, 4012 Debrecen, Hungary
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Lázár J, Szabó T, Kovács L, Blumberg PM, Bíró T. Distinct features of recombinant rat vanilloid receptor-1 expressed in various expression systems. Cell Mol Life Sci 2003; 60:2228-40. [PMID: 14618269 DOI: 10.1007/s00018-003-3230-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [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: 11/27/2022]
Abstract
In this study, we expressed rat vanilloid receptor 1 (VR1) in various heterologous expression systems using different VR1-encoding vectors, and examined how the VR1 agonists capsaicin and resiniferatoxin affected intracellular calcium. Our results clearly show that the magnitude and kinetics of response as well as the extent of tachyphylaxis differ markedly between systems. Using green fluorescent protein-tagged VR1, we show that much of the VR1 is localized to intracellular membranes. Consistent with this localization, VR1 agonists are able to liberate calcium from intracellular stores in the absence of extracellular calcium. As with other parameters of response, the three expression systems differ in the degree to which, in the absence of extracellular calcium, capsaicin and resiniferatoxin can liberate calcium from the intracellular stores. Our findings emphasize the influence of the expression system on characteristics of the response of VR1 to its ligands and the need for caution in extrapolating such results to other settings.
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Affiliation(s)
- J Lázár
- Department of Physiology and Cell Physiology Research Group of the Hungarian Academy of Sciences, Research Center for Molecular Medicine, University of Debrecen, Medical and Health Science Center, Medical School, Nagyerdei Krt. 98, 4012 Debrecen, Hungary
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Boczán J, Bíró T, Czifra G, Lázár J, Papp H, Bárdos H, Adány R, Mechler F, Kovács L. Phorbol ester treatment inhibits proliferation and differentiation of cultured human skeletal muscle satellite cells by differentially acting on protein kinase C isoforms. Acta Neuropathol 2001; 102:55-62. [PMID: 11547951 DOI: 10.1007/s004010000347] [Citation(s) in RCA: 6] [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: 10/25/2022]
Abstract
We have previously shown that cultured human skeletal muscle cells express five protein kinase C (PKC) isoforms (PKCalpha, -gamma, -eta, -theta, and -zeta) and that expression levels of various PKC isozymes differentially change during differentiation. In this study we investigated the effects of the PKC activator phorbol 12-myristate 13-acetate (PMA) on differentiation and on PKC isozymes of human skeletal muscle satellite cells. PMA inhibited the growth and fusion of cultured human myoblasts in a dose-dependent manner. In addition, prolonged treatment of cells with PMA suppressed the expression of the myogenic differentiation marker desmin showing similar dose-response characteristics. Furthermore, PMA also induced the intracellular translocation of PKCgamma, -eta, and -theta, whereas cellular localization of PKCalpha and -zeta were not altered. These changes in subcellular localization patterns were of great importance since only those PKC isoforms were translocated that possessed alterations in their expression levels during differentiation. Our findings, therefore, suggest that the PMA-induced inhibition of differentiation of human skeletal muscle cells is mediated by certain PKC isoforms. Moreover, these data strongly argue for differential and isozyme-specific roles of various PKC isoforms in these processes.
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Affiliation(s)
- J Boczán
- Department of Physiology and Cell Physiology Research Group of the Hungarian Academy of Sciences, University of Debrecen, Medical and Health Science Center, Medical School
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Berkó A, Bíró T, Solymosi F. Formation and Migration of Carbon Produced in the Dissociation of CO on Rh/TiO2(110)−(1 × 2) Model Catalyst: A Scanning Tunneling Microscopy Study. J Phys Chem B 2000. [DOI: 10.1021/jp9924981] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Berkó
- Reaction Kinetics Research Group of the Hungarian Academy of Sciences and Department of Solid State and Radiochemistry, Attila József University, P.O. Box 168, H-6701, Szeged, Hungary
| | - T. Bíró
- Reaction Kinetics Research Group of the Hungarian Academy of Sciences and Department of Solid State and Radiochemistry, Attila József University, P.O. Box 168, H-6701, Szeged, Hungary
| | - F. Solymosi
- Reaction Kinetics Research Group of the Hungarian Academy of Sciences and Department of Solid State and Radiochemistry, Attila József University, P.O. Box 168, H-6701, Szeged, Hungary
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Boczán J, Boros S, Mechler F, Kovács L, Bíró T. Differential expressions of protein kinase C isozymes during proliferation and differentiation of human skeletal muscle cells in vitro. Acta Neuropathol 2000; 99:96-104. [PMID: 10672314 DOI: 10.1007/pl00007429] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [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: 10/25/2022]
Abstract
The mechanism of skeletal muscle regeneration in vivo can be well modeled in vitro by culturing skeletal muscle cells. In these cultures mononuclear satellite cells fuse to form polynuclear myotubes by proliferation and differentiation. The aim of this study was to determine how the different protein kinase C (PKC) isozymes were expressed during differentiation of human skeletal muscle in vitro. The expressions of desmin, used as a muscle-specific intermediate filament protein marker of differentiation, and of different PKC isozymes were detected by single and double immunohistochemical labeling, and by Western blot analysis. In skeletal muscle cells we could identify five PKC isozymes (PKC alpha, -gamma, -etha, -theta and -zeta). The expressions of PKC alpha and -zeta did not change significantly during differentiation; their levels of expression were high in the early immature cells and remained unchanged in later phases. In contrast, the expression levels of PKC gamma and -etha increased with differentiation. Furthermore, the cellular localization of PKC gamma markedly altered during differentiation, with a perinuclear-nuclear to cytoplasmic translocation. The change in the level of expression of PKC theta during differentiation showed different pattern; its expression was high during the early phases, but a decreased immunostaining was detected in the matured, well-differentiated myotubes. We conclude, therefore, that cultured human skeletal muscle cells possess a characteristic PKC isozyme pattern, and that the different phases of differentiation are accompanied by different expression patterns of the various isozymes. These data suggest the possible functional and differential roles of PKC isozymes in human skeletal muscle differentiation.
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Affiliation(s)
- J Boczán
- Department of Physiology and Cell Physiology, University Medical School of Debrecen, Hungary
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Szallasi A, Szabó T, Bíró T, Modarres S, Blumberg PM, Krause JE, Cortright DN, Appendino G. Resiniferatoxin-type phorboid vanilloids display capsaicin-like selectivity at native vanilloid receptors on rat DRG neurons and at the cloned vanilloid receptor VR1. Br J Pharmacol 1999; 128:428-34. [PMID: 10510454 PMCID: PMC1571651 DOI: 10.1038/sj.bjp.0702810] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [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] [Indexed: 01/08/2023] Open
Abstract
1 Although the cloned rat vanilloid receptor VR1 appears to account for both receptor binding and calcium uptake, the identification of vanilloids selective for one or the other response is of importance because these ligands may induce distinct patterns of biological activities. 2 Phorbol 12,13-didecanoate 20-homovanillate (PDDHV) evoked 45Ca(2+)-uptake by rat dorsal root ganglion neurons (expressing native vanilloid receptors) in culture with an EC50 of 70 nM but inhibited [3H]-resiniferatoxin (RTX) binding to rat dorsal root ganglion membranes with a much lower potency (Ki>10,000 nM). This difference in potencies represents a more than 100 fold selectivity for capsaicin-type pharmacology. 3 45Ca2+ influx by PDDHV was fully inhibited by the competitive vanilloid receptor antagonist capsazepine, consistent with the calcium uptake occurring via vanilloid receptors. 4 PDDHV induced calcium mobilization in CHO cells transfected with the cloned rat vanilloid receptor VR1 with an EC50 of 125 nM and inhibited [3H]-RTX binding to these cells with an estimated Ki of 10,000 nM. By contrast, PDDHV failed to evoke a measurable calcium response in non-transfected CHO cells, confirming its action through VR1. 5 We conclude that PDDHV is two orders of magnitude more potent for inducing calcium uptake than for inhibiting RTX binding at vanilloid receptors, making this novel vanilloid a ligand selective for capsaicin-type pharmacology. These results emphasize the importance of monitoring multiple endpoints for evaluation of vanilloid receptor structure-activity relations. Furthermore, PDDHV now provides a tool to explore the biological correlates of capsaicin-type vanilloid pharmacology.
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Affiliation(s)
- A Szallasi
- National Cancer Institute, Bethesda, Maryland, USA.
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Szallasi A, Bíró T, Szabó T, Modarres S, Petersen M, Klusch A, Blumberg PM, Krause JE, Sterner O. A non-pungent triprenyl phenol of fungal origin, scutigeral, stimulates rat dorsal root ganglion neurons via interaction at vanilloid receptors. Br J Pharmacol 1999; 126:1351-8. [PMID: 10217528 PMCID: PMC1565912 DOI: 10.1038/sj.bjp.0702440] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [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] [Indexed: 01/02/2023] Open
Abstract
1. A [3H]-resiniferatoxin (RTX) binding assay utilizing rat spinal cord membranes was employed to identify novel vanilloids in a collection of natural products of fungal origin. Of the five active compounds found (scutigeral, acetyl-scutigeral, ovinal, neogrifolin, and methyl-neogrifolin), scutigeral (Ki=19 microM), isolated from the edible mushroom Albatrellus ovinus, was selected for further characterization. 2. Scutigeral induced a dose-dependent 45Ca uptake by rat dorsal root ganglion neurons with an EC50 of 1.6 microM, which was fully inhibited by the competitive vanilloid receptor antagonist capsazepine (IC50=5.2 microM). 3. [3H]-RTX binding isotherms were shifted by scutigeral (10-80 microM) in a competitive manner. The Schild plot of the data had a slope of 0.8 and gave an apparent Kd estimate for scutigeral of 32 microM. 4. Although in the above assays scutigeral mimicked capsaicin, it was not pungent on the human tongue up to a dose of 100 nmol per tongue, nor did it provoke protective wiping movements in the rat (up to 100 microM) upon intraocular instillation. 5. In accord with being non-pungent, scutigeral (5 microM) did not elicit a measurable inward current in isolated rat dorsal root ganglion neurons under voltage-clamp conditions. It did, however, reduce the proportion of neurons (from 61 to 15%) that responded to a subsequent capsaicin (1 microM) challenge. In these neurons, scutigeral both delayed (from 27 to 72 s) and diminished (from 5.0 to 1.9 nA) the maximal current evoked by capsaicin. 6. In conclusion, scutigeral and its congeners form a new chemical class of vanilloids, the triprenyl phenols. Scutigeral promises to be a novel chemical lead for the development of orally active, non-pungent vanilloids.
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Affiliation(s)
- A Szallasi
- Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri, USA.
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Szallasi A, Bíró T, Modarres S, Garlaschelli L, Petersen M, Klusch A, Vidari G, Jonassohn M, De Rosa S, Sterner O, Blumberg PM, Krause JE. Dialdehyde sesquiterpenes and other terpenoids as vanilloids. Eur J Pharmacol 1998; 356:81-9. [PMID: 9761427 DOI: 10.1016/s0014-2999(98)00514-7] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [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: 11/27/2022]
Abstract
Selected naturally occurring unsaturated dialdehyde sesquiterpenes and related bioactive terpenoids were assayed for vanilloid-like activity. Out of the 25 compounds tested, eight inhibited completely the specific binding of [3H]resiniferatoxin by rat spinal cord membranes: binding affinities ranged from 0.6 microM for cinnamodial to 19.0 microM for hebelomic acid F. These values were comparable to the binding affinity of capsaicin (2.7 microM). With the exception of four ligands, compounds that inhibited resiniferatoxin binding to rat spinal cord membranes were also pungent on the human tongue where they showed cross-tachyphylaxis with capsaicin. As expected from their reactive nature, these compounds possess additional sites of action, as reflected in the complex behavior of the stimulation of calcium influx by cinnamodial and cinnamosmolide at high concentrations. This observation might explain the unexpectedly weak membrane depolarization by cinnamodial compared to capsaicin. We conclude that a range of sesquiterpene dialdehydes and related terpenoids, both pungent and non-pungent, may function as vanilloids. These compounds may represent a new chemical lead for the development of vanilloid drugs, structurally unrelated to either capsaicin or resiniferatoxin.
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Affiliation(s)
- A Szallasi
- Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, MO 63110, USA
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Bíró T, Szabó I, Kovács L, Hunyadi J, Csernoch L. Distinct subpopulations in HaCaT cells as revealed by the characteristics of intracellular calcium release induced by phosphoinositide-coupled agonists. Arch Dermatol Res 1998; 290:270-6. [PMID: 9681679 DOI: 10.1007/s004030050303] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [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: 02/08/2023]
Abstract
Intracellular calcium release induced by transient applications of phosphoinositide agonists was measured using adherent single HaCaT keratinocytes loaded with the acetoxymethyl derivative of fura-2. Application of ATP, bradykinin and formyl-Met-Leu-Phe (fMLP) resulted in a transient increase in intracellular calcium concentration ([Ca2+]i) with an average half-width of 40+/-21 s and a decay time constant of 15+/-10 s (mean +/- SD, n = 108), irrespective of the agonist applied. The cells could be classified into two groups: in 53% of the cells repeated stimulation brought about a progressively smaller change in [Ca2+]i (type 1 cells), whereas in the remaining cells the amplitude of the calcium transients was essentially unchanged (type 2 cells). Furthermore, calcium transients in type 1 cells had broader half-widths and slower decays. No difference was found between the agonists in respect of the characteristics of the evoked calcium transient within each subpopulation. However, bradykinin and fMLP desensitized some cells. These results indicate that the activation of the inositol trisphospate transduction pathway by different agonists induces a characteristic elevation of [Ca2+]i within a given cell. Our results demonstrate that cultured HaCaT keratinocytes are heterogeneous in respect of the calcium transients evoked by the activators of this second messenger system.
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Affiliation(s)
- T Bíró
- Department of Physiology, University Medical School Debrecen, Hungary
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