ABC protein, ATP-binding cassette protein
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Název „ATP binding cassette“ představuje velkou rodinu transmembránových proteinů, které vážou ATP a energii z tohoto zdroje využívají k aktivnímu řízenému transportu chemicky různorodých látek z vnitřního prostředí buňky do extracelulárního prostoru. Mezi endogenní látky, na jejichž transportu se zástupci této transportní rodiny podílejí, patří lipidy, steroidy, hormony či bilirubin; významnou úlohu však mají i v transportu xenobiotik.
Východiska: Cílem této práce je porovnání exprese ABC transportérů P-glykoprotein (Pgp), multilékový rezistentní protein 1 (multidrug related protein – MRP) a MRP3 u pacientek s karcinomem ovaria, pacientek s benigní cystou ovaria a žen zdravých a zhodnocení vztahu exprese ABC transportérů s klinicko-patologickými parametry u pacientek s karcinomem ovaria. Soubor pacientek a metodika: Stanovení ABC transportérů (Pgp, MRP1, MRP3) bylo provedeno celkem u 212 vzorků pacientek operovaných na Porodnické a gynekologické klinice FN Hradec Králové. Pro zhodnocení exprese ABC transportérů byla použita metoda dvoustupňové imunohistochemie. Výsledky: Hodnoty ABC transportérů Pgp a MRP1 byly nejvyšší ve tkáni ovariálního karcinomu v porovnání s hodnotami v ovariální tkáni změněné benigní cystou a normální tkání vaječníku. Prakticky nulové hodnoty Pgp a MRP1 jsme zaznamenali ve zdravé tkáni vaječníku. Pgp, MRP1 a MRP3 vykazovaly výrazné rozdíly hodnot v závislosti na histologickém typu ovariálního karcinomu. Nejnižší exprese Pgp a MRP1 byla zjištěna u endometroidního ovariálního karcinomu (p = 0,151; p = 0,013). Byl zaznamenán nárůst MRP1 od časných stadií (FIGO I + II) k pokročilému onemocnění (FIGO III + IV) – I + II 80 % (CI 60–100), III + IV 100 % (CI 90–100); p = 0,100. Stupeň diferenciace významně ovlivnil pouze hodnoty MRP1, které narůstaly směrem od dobře diferencovaného ke špatně diferencovanému karcinomu ovaria (p < 0,001). Závěr: Exprese proteinů rezistence vykazovala statisticky významné změny v patologicky změněné ovariální tkání v porovnání s normální tkání vaječníků. Výrazná exprese ABC transportérů se objevila již ve výstelce benigní cysty vaječníku. V normální tkáni vaječníku byly jejich hodnoty prakticky nulové. ABC transportéry tedy pravděpodobně sehrávají významnou roli již v patogenezi karcinomu ovaria a jejich exprese je ovlivněna histologickým typem karcinomu ovaria.
Background: This study was designed to compare the expression of PgP (P-glycoprotein), MRP1 (multidrug related protein), and MRP3 in ovarian cancer patients, patients with benign ovarian tumors, and healthy women, and to evaluate the correlation between the expression of ATP-binding cassette proteins Pgp, MRP1, and MRP3 with stage, grade, and histological type. Patients and Methods: Tissue specimens from 212 women who underwent surgery at the Department of Obstetrics and Gynecology at University Hospital Hradec Králové were subjected to immunohistochemical staining for Pgp, MRP1, and MRP3. Results: The expression of Pgp and MRP1 was higher in ovarian tumor cells than in the cells lining the ovarian cyst. The lowest level of expression was found in normal ovarian tissue (p < 0.001). Histological subtype of epithelial ovarian cancer correlated with the expression of PgP, MRP1, and MRP3. The lowest level of Pgp and MRP1 expression was found in endometrioid ovarian cancers (p = 0.151; p = 0.013). Patients with advanced ovarian cancer (FIGO III + IV) had higher MRP1 expression than those with early stage ovarian cancer (median MRP1 FIGO I + II 80%; CI 60–100; FIGO III + IV 100%; CI 90–100; p = 0.100). An association was observed between MRP1 and tumor grade (p < 0.001). Conclusion: Pgp and MRP1 expression was higher in ovarian tumor cells than in cells lining the ovarian cyst. The lowest level of expression was found in normal ovarian tissue. ATP-binding cassette proteins play an important role in ovarian cancer pathogenesis.
- Klíčová slova
- multilékový rezistentní protein 1 (MRP1), multilékový rezistentní protein 3 (MRP3),
- MeSH
- ABC transportéry metabolismus MeSH
- analýza rozptylu MeSH
- chemorezistence MeSH
- dospělí MeSH
- imunohistochemie MeSH
- lidé středního věku MeSH
- lidé MeSH
- mnohočetná léková rezistence MeSH
- nádorové biomarkery metabolismus MeSH
- nádorové proteiny metabolismus MeSH
- nádory vaječníků * metabolismus patologie MeSH
- neparametrická statistika MeSH
- ovariální cysty metabolismus patologie MeSH
- P-glykoprotein * metabolismus MeSH
- proteiny spojené s mnohočetnou rezistencí k lékům * metabolismus MeSH
- retrospektivní studie MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- staging nádorů MeSH
- stupeň nádoru MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- práce podpořená grantem MeSH
- srovnávací studie MeSH
Transportné proteíny z rodiny ABC (ATP-binding cassette) zabezpečujú transport rôznych substrátov cez biologické membrány. Zohrávajú esenciálnu úlohu v ochrane buniek pred toxickými zlúčeninami/metabolitmi. S nadexpresiou ABC transportných proteínov súvisí vznik mnohonásobnej rezistencie (MDR, multidrug resistance) buniek voči antimikróbnym zlúčeninám a protinádorovým chemoterapeutikám. Mutácie proteínov ABC-typu u ľudí sú príčinou viacerých genetických ochorení (cystická fibróza, adrenoleukodystrofia, defekty v transporte cholesterolu, žlče a pod.). Bunky mikroorganizmov obsahujú viaceré homológy klinicky významných ABC proteínov. Ich intenzívne molekulárne štúdium môže prispieť k návrhu nových postupov ako zvládnuť MDR resp. ochorenia, ktoré sú dôsledkom dysfunkcie ABC proteínov. Práca podáva prehľad súčasného stavu poznatkov o ABC transportných proteínoch v bunkách prokaryotických a eukaryotických mikroorganizmov.
The ABC (ATP binding cassette) transporter family includes membrane proteins that can transport a wide variety of substrates across biological membranes. These proteins play an essential role in the protection of cells from toxic compounds/metabolites. Their overexpression which leads to the development of multidrug resistance (MDR) in pathogens and enables cancer cells to survive chemotherapy is of major concern for human health. Mutations in ABC transporters are implicated in a number of Mendelian disorders such as cystic fibrosis, adrenoleukodystrophy and cholesterol and bile transport defects. In microbial cells, several homologues of human ABC transporters were identified. Their further molecular biological study can contribute to better understanding and treatment of MDR or diseases caused by dysfunction of ABC transporter proteins. A review is presented of the state of the art in ABC transporter proteins in both prokaryotic and eucaryotic cells. The role of microbial ABC transporters in the development of drug resistance is analyzed.
PURPOSE: This study investigated the prognostic importance of protein expression of ATP-binding cassette (ABC) transporters ABCC10 and ABCC11 in colorectal cancer. METHODS: Protein content of ABCC10 and ABCC11 was assessed in tumor tissue blocks of 140 colorectal cancer patients and associated with survival of patients with regard to 5-fluorouracil-based therapy. RESULTS: Low ABCC10 protein content in tumors increased hazard ratio of patient's death more than three times in comparison with high ABCC10-expressing tumors (P = 0.004). In contrast, the low ABCC11 content increased the hazard ratio of cancer recurrence in patients almost four times (P = 0.016). Analysis of patients treated with regimens based on 5-fluorouracil revealed that patients with low ABCC11 content in their tumors had shorter disease-free interval than those with higher content (P = 0.024). CONCLUSIONS: The present study shows for the first time that the protein expression of ABCC10 significantly associates with overall survival and the expression of ABCC11 with disease-free interval of colorectal cancer patients and provides strong impulse for further validation of their prognostic value in colorectal cancer.
- MeSH
- ABC transportéry metabolismus MeSH
- fluoruracil terapeutické užití MeSH
- kolorektální nádory farmakoterapie patologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- lokální recidiva nádoru MeSH
- míra přežití MeSH
- následné studie MeSH
- přežití bez známek nemoci MeSH
- prognóza MeSH
- proteiny spojené s mnohočetnou rezistencí k lékům metabolismus MeSH
- protinádorové antimetabolity terapeutické užití MeSH
- retrospektivní studie MeSH
- senioři MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
Východiska: ABC transportní proteiny odpovědné za MDR intenzivně pumpují různá xenobiotika z buňky a snižují tak účinek léků. Tyto proteiny přispívají ke vzniku rezistence také u karcinomu plic, který je vedoucí příčinou úmrtí mezi všemi typy nádorů v České republice a má rostoucí incidenci. Metody: Na buněčných liniích HL60 a také HL60-MDR1, HL60-MRP1 a PLB-BCRP bylo ověřeno pomocí cytotoxického testu WST-1, jestli ciglitazon, rosiglitazon a troglitazon (patřící do rodiny agonistů PPAR-γ) jsou substráty následujících ABC transportérů: multidrug resistance protein 1 (MDR1), multidrug resistance-associated protein 1 (MRP1) a breast cancer resistance protein (BCRP). Dále bylo testováno pomocí qRT-PCR, zda uvedené thiazolidindiony působí změnu exprese ABC transportérů u buněčné linie nemalobuněčného adenokarcinomu plic (A549). Metodou Western blot bylo analyzováno, zda-li je tato exprese regulována signální dráhou PI3K/Akt. Výsledky: Bylo zjištěno, že všechny tři thiazolidindiony jsou substráty minimálně jednoho ze studovaných ABC transportérů. Aktivace receptoru PPAR-γ koreluje s aktivací nádorového supresoru PTEN, který je zapojen do signální dráhy PI3K/Akt. Bylo prokázáno, že rosiglitazon a troglitazon výrazně inhibují expresi mRNA transportéru MDR1. Naproti tomu exprese transportérů MRP1 po ovlivnění rosiglitazonem a exprese transportérů MDR1 po ovlivnění ciglitazonem je aktivována. Závěr: Naše výsledky naznačují, že ze studovaných thiazolidindionů působí inhibičně pouze rosiglitazon a troglitazon, a to na expresi transportéru MDR1 na úrovni mRNA.
ATP binding cassette (ABC) transporters related to multidrug resistance (MDR) actively efflux various xenobiotics from the cells across the cell membrane and decrease a drug's efficiency. Lung cancer is the leading cause of death among all types of cancer in the Czech Republic, and its incidence is still rising. Ciglitazone, rosiglitazone and troglitazone belonging to PPAR‑γ agonist family (formerly used in diabetes mellitus treatment) were selected to investigate their capability to influence expression of ABC transporters on lung cancer cells. Therefore, the effect of PPAR‑γ of agonists on transcription of following ABC transporters was investigated: multidrug resistance protein 1 (MDR1), multidrug resistance-associated protein 1 (MRP1), and breast cancer resistance protein (BCRP). We have investigated if these PPAR‑γ agonists are substrates of ABC transporters using HL60 and HL60 derived cell lines (HL60-MDR1, HL60-MRP1, PLB-BCRP) by cytotoxicity test WST-1. We have mapped the changes in mRNA expression level of those transporters in A549 and HEK293 cells after PPAR‑γ agonists treatment using quantitative reverse transcription real-time PCR (qRT-PCR). All three PPAR‑γ agonists serve as substrates to at least one ABC transporter under study. PPAR‑γ activation correlates with up-regulation of PTEN which may modulate the expression of ABC transporters through PI3K/Akt signaling pathway. We have shown that rosiglitazone and troglitazone inhibit mRNA expression of MDR1 transporter in both cell lines whereas the expression of MRP1 in HEK293 cell was up-regulated after rosiglitazone treatment and the expression of MDR1 was upregulated after ciglitazone treatment.
- Klíčová slova
- signální dráha PI3K/ Akt, agonisté PPAR-γ,
- MeSH
- ABC transportéry * MeSH
- chemorezistence MeSH
- fosfatidylinositol-3-kinasy MeSH
- HEK293 buňky účinky léků MeSH
- kvantitativní polymerázová řetězová reakce MeSH
- lidé MeSH
- mnohočetná léková rezistence * MeSH
- nádorové buněčné linie účinky léků MeSH
- nádorové proteiny MeSH
- nádory plic MeSH
- P-glykoproteiny MeSH
- polymerázová řetězová reakce s reverzní transkripcí MeSH
- proteiny spojené s mnohočetnou rezistencí k lékům MeSH
- receptory aktivované proliferátory peroxizomů agonisté MeSH
- statistika jako téma MeSH
- thiazolidindiony * farmakologie MeSH
- troglitazon MeSH
- viabilita buněk MeSH
- western blotting MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- práce podpořená grantem MeSH
Chalcones, potential anticancer agents, have shown promise in the suppression of multidrug resistance due to the inhibition of drug efflux driven by certain adenosine triphosphate (ATP)-binding cassette (ABC) transporters. The gene and protein expression of chosen ABC transporters (multidrug resistance protein 1, ABCB1; multidrug resistance-associated protein 1, ABCC1; and breast cancer resistance protein, ABCG2) in human colorectal cancer cells (COLO 205 and COLO 320, which overexpress active ABCB1) was mainly studied in this work under the influence of a novel synthetic acridine-based chalcone, 1C. While gene expression dropped just at 24 h, compound 1C selectively suppressed colorectal cancer cell growth and greatly lowered ABCB1 protein levels in COLO 320 cells at 24, 48, and 72 h. It also reduced ABCC1 protein levels after 48 h. Molecular docking and ATPase tests show that 1C probably acts as an allosteric modulator of ABCB1. It also lowered galectin-1 (GAL1) expression in COLO 205 cells at 24 h. Functional tests on COLO cells revealed ABCB1 and ABCC1/2 to be major contributors to multidrug resistance in both. Overall, 1C transiently lowered GAL1 in COLO 205 while affecting important functional ABC transporters, mostly ABCB1 and to a lesser extent ABCC1 in COLO 320 cells. COLO 320's absence of GAL1 expression points to a possible yet unknown interaction between GAL1 and ABCB1.
- MeSH
- ABC transportér z rodiny G, člen 2 metabolismus MeSH
- ABC transportéry * metabolismus chemie genetika MeSH
- akridiny * chemie farmakologie MeSH
- chalkon * farmakologie chemie MeSH
- chalkonoidy * farmakologie chemie MeSH
- chemorezistence účinky léků MeSH
- kolorektální nádory metabolismus farmakoterapie MeSH
- lidé MeSH
- nádorové buněčné linie MeSH
- P-glykoproteiny metabolismus genetika MeSH
- proliferace buněk účinky léků MeSH
- protein spojený s mnohočetnou rezistencí k lékům 2 MeSH
- proteiny spojené s mnohočetnou rezistencí k lékům metabolismus genetika MeSH
- protinádorové látky * farmakologie chemie MeSH
- regulace genové exprese u nádorů účinky léků MeSH
- simulace molekulového dockingu MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
Ribavirin is a broad-spectrum nucleoside-derived antiviral drug used in combination pharmacotherapy treatment of hepatitis C virus infection. Current evidence indicates that ribavirin-associated teratogenicity is not significant in humans, but more information about the developmental toxicity and mechanisms involved in ribavirin placental kinetics is required to assure its safe use in pregnancy. Thus, we have investigated potential roles of equilibrative nucleoside transporters (ENTs, SLC29A), Na+-dependent influx-mediating concentrative nucleoside transporters (CNTs, SLC28A), and ATP-binding cassette (ABC) efflux pumps, in ribavirin placental pharmacokinetics. Our data indicate that ENT1 participates in uptake of ribavirin by BeWo cells, fresh human placental villous fragments and microvillous plasma membrane (MVM) vesicles while activity of CNTs (probably CNT2) was only observed in BeWo cells. In situ dual perfusion experiments with rat term placenta in an open circuit setup showed that ENT inhibition significantly decreases total ribavirin maternal-to-foetal and foetal-to-maternal clearances. In contrast, no contribution of ABC transporters, p-glycoprotein (ABCB1), breast cancer resistance protein (ABCG2), or multidrug resistance-associated protein (ABCC2) was detected in assays with MDCKII cells overexpressing them, or in closed circuit dual perfusion experiments with rat term placenta. In summary, our data show that ribavirin placental pharmacokinetics are largely controlled by ENT1 activity and independent of ABCB1, ABCG2, and ABCC2 efflux pumps.
- MeSH
- ABC transportéry fyziologie MeSH
- antimetabolity metabolismus farmakologie MeSH
- buňky MDCK MeSH
- druhová specificita MeSH
- ekvilibrační přenašeč nukleosidů 1 metabolismus MeSH
- krysa rodu rattus MeSH
- lidé MeSH
- nádorové buněčné linie MeSH
- nukleosidy fyziologie MeSH
- placenta účinky léků metabolismus MeSH
- potkani Wistar MeSH
- psi MeSH
- ribavirin metabolismus farmakologie MeSH
- těhotenství MeSH
- transport proteinů účinky léků fyziologie MeSH
- vztah mezi dávkou a účinkem léčiva MeSH
- zvířata MeSH
- Check Tag
- krysa rodu rattus MeSH
- lidé MeSH
- psi MeSH
- těhotenství MeSH
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Purine cyclin-dependent kinase inhibitors have been recognized as promising candidates for the treatment of various cancers; nevertheless, data regarding interaction of these substances with drug efflux transporters is still lacking. Recently, we have demonstrated inhibition of breast cancer resistance protein (ABCG2) by olomoucine II and purvalanol A and shown that these compounds are able to synergistically potentiate the antiproliferative effect of mitoxantrone, an ABCG2 substrate. In this follow up study, we investigated whether olomoucine II and purvalanol A are transported by ABCG2 and ABCB1 (P-glycoprotein). Using monolayers of MDCKII cells stably expressing human ABCB1 or ABCG2, we demonstrated that olomoucine II, but not purvalanol A, is a dual substrate of both ABCG2 and ABCB1. We, therefore, assume that pharmacokinetics of olomoucine II will be affected by both ABCB1 and ABCG2 transport proteins, which might potentially result in limited accumulation of the compound in tumor tissues or lead to drug-drug interactions. Pharmacokinetic behavior of purvalanol A, on the other hand, does not seem to be affected by either ABCG2 or ABCB1, theoretically favoring this drug in the potential treatment of efflux transporter-based multidrug resistant tumors. In addition, we observed intensive sulfatation of olomoucine II in MDCKII cell lines with subsequent active efflux of the metabolite out of the cells. Therefore, care should be taken when performing pharmacokinetic studies in MDCKII cells, especially if radiolabeled substrates are used; the generated sulfated conjugate may largely contaminate pharmacokinetic analysis and result in misleading interpretation. With regard to chemical structures of olomoucine II and purvalanol A, our data emphasize that even drugs with remarkable structure similarity may show different pharmacokinetic behavior such as interactions with ABC transporters or biotransformation enzymes.
- MeSH
- ABC transportéry metabolismus MeSH
- biologický transport MeSH
- buněčné linie MeSH
- chemorezistence účinky léků MeSH
- nádorové proteiny metabolismus MeSH
- P-glykoprotein metabolismus MeSH
- psi MeSH
- puriny farmakokinetika MeSH
- zvířata MeSH
- Check Tag
- psi MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
AIM: ATP-binding cassette (ABC) transporters contribute to development of resistance to anticancer drugs via ATP-dependent drug efflux. A major goal of our study was to investigate associations between the expression of ABC transporters and outcome of breast carcinoma patients. PATIENTS & METHODS: Transcript levels of all 49 human ABC transporters were determined in post-treatment tumor and non-neoplastic tissue samples from 68 breast carcinoma patients treated by neoadjuvant chemotherapy. Six ABC transporters were then evaluated in independent series of 100 pretreatment patients. RESULTS: ABCA5/6/8/9/10, ABCB1/5/11, ABCC6/9, ABCD2/4, ABCG5 and ABCG8 were significantly downregulated and ABCA2/3/7/12, ABCB2/3/8/9/10, ABCC1/4/5/10/11/12, ABCD1/3, ABCE1, ABCF1/2/3 and ABCG1 were upregulated in post-treatment tumors compared with non-neoplastic tissues. Significant associations of intratumoral levels of ABCC1 and ABCC8 with grade and expression of hormonal receptors were found in both sets of patients. ABCA12, ABCA13 and ABCD2 levels were significantly associated with the response to neoadjuvant chemotherapy in post-treatment patients. Protein expression of ABCA12, ABCC8 and ABCD2 in tumor tissues of patients with breast carcinoma was observed by immunoblotting for the first time. CONCLUSION: ABCA12, ABCA13, ABCC1, ABCC8 and ABCD2 present potential modifiers of progression and response to the chemotherapy of breast carcinoma.
- MeSH
- ABC transportéry genetika metabolismus MeSH
- genetické asociační studie MeSH
- karcinom farmakoterapie genetika patologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- nádory prsu farmakoterapie genetika patologie MeSH
- neoadjuvantní terapie MeSH
- protinádorové látky aplikace a dávkování MeSH
- regulace genové exprese u nádorů MeSH
- stanovení celkové genové exprese MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
BACKGROUND: The ATP-binding cassette (ABC) transporter superfamily is comprised predominantly of proteins which directly utilize energy from ATP to move molecules across the plasma membrane. Although they have been the subject of frequent investigation across many taxa, arthropod ABCs have been less well studied. While the manual annotation of ABC transporters has been performed in many arthropods, there has so far been no systematic comparison of the superfamily within this order using the increasing number of sequenced genomes. Furthermore, functional work on these genes is limited. RESULTS: Here, we developed a standardized pipeline to annotate ABCs from predicted proteomes and used it to perform comparative genomics on ABC families across arthropod lineages. Using Kruskal-Wallis tests and the Computational Analysis of gene Family Evolution (CAFE), we were able to observe significant expansions of the ABC-B full transporters (P-glycoproteins) in Lepidoptera and the ABC-H transporters in Hemiptera. RNA-sequencing of epithelia tissues in the Lepidoptera Helicoverpa armigera showed that the 7 P-glycoprotein paralogues differ substantially in their tissue distribution, suggesting a spatial division of labor. It also seems that functional redundancy is a feature of these transporters as RNAi knockdown showed that most transporters are dispensable with the exception of the highly conserved gene Snu, which is probably due to its role in cuticular formation. CONCLUSIONS: We have performed an annotation of the ABC superfamily across > 150 arthropod species for which good quality protein annotations exist. Our findings highlight specific expansions of ABC transporter families which suggest evolutionary adaptation. Future work will be able to use this analysis as a resource to provide a better understanding of the ABC superfamily in arthropods.