scholarly journals Activation of Drosophila melanogaster TRPA1 Isoforms by Citronellal and Menthol

2021 ◽  
Vol 22 (20) ◽  
pp. 10997
Author(s):  
Brett Boonen ◽  
Justyna B. Startek ◽  
Alina Milici ◽  
Alejandro López-Requena ◽  
Melissa Beelen ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Transient Receptor Potential ◽  
Expression System ◽  
Receptor Potential ◽  
Chemical Sensitivity ◽  
Wild Type ◽  
Olfactory Test ◽  
Whole Cell Patch Clamp ◽  
Transient Receptor ◽  
Noxious Chemicals

Background: The transient receptor potential ankyrin 1 (TRPA1) cation channels function as broadly-tuned sensors of noxious chemicals in many species. Recent studies identified four functional TRPA1 isoforms in Drosophila melanogaster (dTRPA1(A) to (D)), but their responses to non-electrophilic chemicals are yet to be fully characterized. Methods: We determined the behavioral responses of adult flies to the mammalian TRPA1 non-electrophilic activators citronellal and menthol, and characterized the effects of these compounds on all four dTRPA1 channel isoforms using intracellular Ca2+ imaging and whole-cell patch-clamp recordings. Results: Wild type flies avoided citronellal and menthol in an olfactory test and this behavior was reduced in dTrpA1 mutant flies. Both compounds activate all dTRPA1 isoforms in the heterologous expression system HEK293T, with the following sensitivity series: dTRPA1(C) = dTRPA1(D) > dTRPA1(A) ≫ dTRPA1(B) for citronellal and dTRPA1(A) > dTRPA1(D) > dTRPA1(C) > dTRPA1(B) for menthol. Conclusions: dTrpA1 was required for the normal avoidance of Drosophila melanogaster towards citronellal and menthol. All dTRPA1 isoforms are activated by both compounds, but the dTRPA1(B) is consistently the least sensitive. We discuss how these findings may guide further studies on the physiological roles and the structural bases of chemical sensitivity of TRPA1 channels.

scholarly journals Activation of Drosophila melanogaster TRPA1 isoforms by citronellal and menthol

2021 ◽  
Author(s):  
Brett Boonen ◽  
Justyna B. Startek ◽  
Alina Milici ◽  
Alejandro López-Requena ◽  
Melissa Beelen ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Transient Receptor Potential ◽  
Expression System ◽  
Receptor Potential ◽  
Chemical Sensitivity ◽  
Wild Type ◽  
Olfactory Test ◽  
Whole Cell Patch Clamp ◽  
Transient Receptor ◽  
Noxious Chemicals

The Transient Receptor Potential Ankyrin 1 (TRPA1) cation channels function as broadly-tuned sensors of noxious chemicals in many species. Recent studies identified four functional TRPA1 isoforms in Drosophila melanogaster (dTRPA1(A) to (D)), but their responses to non-electrophilic chemicals are yet to be fully characterized. Methods: We determined the behavioral responses of adult flies to the mammalian TRPA1 non-electrophilic activators citronellal and menthol, and characterized the effects of these compounds on all four dTRPA1 channel isoforms using intracellular Ca2+ imaging and whole-cell patch-clamp recordings. Results: Wild type flies avoided citronellal and menthol in an olfactory test and this behavior was reduced in dTrpA1 mutant flies. Both compounds activate all dTRPA1 isoforms in the heterologous expression system HEK293T, with the following sensitivity series: dTRPA1(C) = dTRPA1(D) > dTRPA1(A) ≫ dTRPA1(B) for citronellal and dTRPA1(A) > dTRPA1(D) > dTRPA1(C) > dTRPA1(B) for menthol. Conclusions: dTrpA1 was required for the normal avoidance of Drosophila melanogaster towards citronellal and menthol. All dTRPA1 isoforms are activated by both compounds, but the dTRPA1(B) is consistently the least sensitive. We discuss how these findings may guide further studies on the physiological roles and the structural bases of chemical sensitivity of TRPA1 channels.

scholarly journals Novel role of transient receptor potential vanilloid 2 in the regulation of cardiac performance

2014 ◽  
Vol 306 (4) ◽  
pp. H574-H584 ◽  
Author(s):  
Jack Rubinstein ◽  
Valerie M. Lasko ◽  
Sheryl E. Koch ◽  
Vivek P. Singh ◽  
Vinicius Carreira ◽  
...  
Keyword(s):  
Vascular Function ◽  
Transient Receptor Potential ◽  
Receptor Potential ◽  
Transient Receptor Potential Vanilloid ◽  
Wild Type ◽  
Transient Receptor ◽  
Systolic And Diastolic Function ◽  
Myocyte Contractility

Transient receptor potential cation channels have been implicated in the regulation of cardiovascular function, but only recently has our laboratory described the vanilloid-2 subtype (TRPV2) in the cardiomyocyte, though its exact mechanism of action has not yet been established. This study tests the hypothesis that TRPV2 plays an important role in regulating myocyte contractility under physiological conditions. Therefore, we measured cardiac and vascular function in wild-type and TRPV2−/− mice in vitro and in vivo and found that TRPV2 deletion resulted in a decrease in basal systolic and diastolic function without affecting loading conditions or vascular tone. TRPV2 stimulation with probenecid, a relatively selective TRPV2 agonist, caused an increase in both inotropy and lusitropy in wild-type mice that was blunted in TRPV2−/− mice. We examined the mechanism of TRPV2 inotropy/lusitropy in isolated myocytes and found that it modulates Ca2+ transients and sarcoplasmic reticulum Ca2+ loading. We show that the activity of this channel is necessary for normal cardiac function and that there is increased contractility in response to agonism of TRPV2 with probenecid.

Monosodium urate crystal interleukin-1β release is dependent on Toll-like receptor 4 and transient receptor potential V1 activation

Rheumatology ◽  
2019 ◽  
Author(s):  
Mateus F. Rossato ◽  
Carin Hoffmeister ◽  
Gabriela Trevisan ◽  
Fabio Bezerra ◽  
Thiago M. Cunha ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Synovial Fluid ◽  
Transient Receptor Potential ◽  
Receptor Potential ◽  
Acute Gout ◽  
Toll Like Receptor ◽  
Wild Type ◽  
Toll Like Receptor 4 ◽  
Transient Receptor ◽  
Nitrite Nitrate

AbstractObjectiveThe present study aimed to elucidate the mechanisms involved in MSU-induced IL-1β release in a rodent animal model of acute gout arthritis.MethodsPainful (mechanical and thermal hypersensitivity, ongoing pain and arthritis score) and inflammatory (oedema, plasma extravasation, cell infiltration and IL-1β release) parameters were assessed several hours after intra-articular injection of MSU (100 µg/articulation) in wild-type or knockout mice for Toll-like receptor 4 (TLR4), inducible nitric oxide synthase (iNOS), transient receptor potential (TRP) V1 and the IL-1 receptor (IL-1R). Also, wild-type animals were treated with clodronate, lipopolysaccharide from Rhodobacter sphaeroides (LPS-RS) (TLR4 antagonist), spleen tyrosine kinase (SYK) inhibitor (iSYK), aminoguanidine (AMG, an iNOS inhibitor) or SB366791 (TRPV1 antagonist). Nitrite/nitrate and IL-1β levels were measured on the synovial fluid of wild-type mice, 2 h after intra-articular MSU injections, or medium from macrophages stimulated for MSU (1000 μg) for 2 h.ResultsIntra-articular MSU injection caused robust nociception and severe inflammation from 2 up to 6 h after injection, which were prevented by the pre-treatment with clodronate, LPS-RS, iSYK, AMG and SB366791, or the genetic ablation of TLR4, iNOS, TRPV1 or IL-1R. MSU also increased nitrite/nitrate and IL-1β levels in the synovial fluid, which was prevented by clodronate, LPS-RS, iSYK and AMG, but not by SB366791. Similarly, MSU-stimulated peritoneal macrophages released nitric oxide, which was prevented by LPS-RS, iSYK and AMG, but not by SB366791, and released IL-1β, which was prevented by LPS-RS, iSYK, AMG and SB366791.ConclusionOur data indicate that MSU may activate TLR4, SYK, iNOS and TRPV1 to induce the release of IL-1β by macrophages, triggering nociception and inflammation during acute gout attack.

148 DIFFERENTIAL REGULATION OF CALCIUM TRANSPORT GENES, I.E., Na+/Ca2+ EXCHANGERS, TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL 6 AND CALBINDINS, IN THE DIVERSE PLACENTAL TISSUES OF CALBINDIN-D9k AND -28k KNOCKOUT MICE VIA PUTATIVE STEROIDS

2012 ◽  
Vol 24 (1) ◽  
pp. 186
Author(s):  
T. H. Koo ◽  
E. B. Jeung
Keyword(s):  
Calcium Binding ◽  
Calcium Transport ◽  
Transient Receptor Potential ◽  
Receptor Potential ◽  
Differential Regulation ◽  
Wild Type ◽  
Rt Pcr ◽  
Calbindin D9k ◽  
Ef Hand ◽  
Transient Receptor

During pregnancy, the placenta represents the establishment of an intimate connection between mother and fetus that is specific to mammals. Calbindins [Calbindin-D9k (CaBP-9k) and -D28k (CaBP-28k)] are proteins possessing EF-hand motifs that have a high affinity for Ca2+ ions and play an important role in the regulation and buffering of Ca2+ in the various tissues. Many types of calcium channels, intracellular calcium binding proteins, Na+/Ca2+ exchangers (NCX) and transient receptor potential cation channels (TRPV) have been found in the placenta. In this study, the calcium channel in maternal-fetal Ca2+ transport was investigated using the phenotypes of wild-type, CaBP-9k, CaBP-28k and CaBP-9k/28k knockout (KO) mouse models. Expressions of calcium transport genes in 3 dissected sections of placenta (MP: maternal, CP: central, FP: fetal) were examined by real-time RT-PCR (RT-qPCR) and Western blot analysis at gestational Day 19 in these mice. The level of TRPV6 mRNA and protein was highest in the MP and CP of CaBP-28k KO mice and the FP of CaBP-9k KO mice compared with other sections of KO mice. The level of CaBP-9k was significantly induced in CaBP-28k KO mice in MP, CP and FP compared with in WT mice, which levels were elevated from maternal to fetal sections. The expression of CaBP-28k mRNA and protein was reduced in CaBP-9k KO mice compared with WT in the 3 sections of placenta. The expression of NCX1 mRNA and protein was higher in all KO mice than in WT in MP and NCX1 was highest in CaBP-28k KO mice in CP, but strong in CaBP-9k KO mice in FP compared with other strains. These results indicate that TRPV6 and NCX1 participate in transferring calcium ions between maternal and fetal compartments and alteration of CaBP-9k/28k is involved in the intracellular Ca2+ buffering system among WT and KO mice. These results taken together indicate that TRPV6 and CaBP-9k genes may play a role as a key element in controlling placental calcium transport during pregnancy.

scholarly journals Prolactin and Dexamethasone Regulate Second Messenger-Stimulated Cl− Secretion in Mammary Epithelia

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Utchariya Anantamongkol ◽  
Mei Ao ◽  
Jayashree Sarathy nee Venkatasubramanian ◽  
Y. Sangeeta Devi ◽  
Nateetip Krishnamra ◽  
...  
Keyword(s):  
Secretory Pathway ◽  
Transient Receptor Potential ◽  
Receptor Potential ◽  
Transient Receptor Potential Channel ◽  
Prolactin Receptors ◽  
Wild Type ◽  
Long Form ◽  
Mammary Epithelia ◽  
Transient Receptor

Mammary gland ion transport is essential for lactation and is regulated by prolactin and glucocorticoids. This study delineates the roles of prolactin receptors (PRLR) and long-term prolactin and dexamethasone (P-D)-mediation of [Ca2+]i and Cl− transport in HC-11 cells. P-D (24 h) suppressed ATP-induced [Ca2+]i. This may be due to decreased Ca2+ entry since P-D decreased transient receptor potential channel 3 (TRPC3) but not secretory pathway Ca2+-ATPase 2 (SPCA2) mRNA. ATP increased Cl− transport, measured by iodide (I−) efflux, in control and P-D-treated cells. P-D enhanced I− efflux response to cAMP secretagogues without altering Cl− channels or NKCC cotransporter expression. HC-11 cells contain only the long form of PRLR (PRLR-L). Since the short isoform, PRLR-S, is mammopoietic, we determined if transfecting PRLR-S (rs) altered PRLR-L-mediated Ca2+ and Cl− transport. Untreated rs cells showed an attenuated [Ca2+]i response to ATP with no further response to P-D, in contrast to vector-transfected (vtc) controls. P-D inhibited TRPC3 in rs and vtc cells but increased SPCA2 only in rs cells. As in wild-type, cAMP-stimulated Cl− transport, in P-D-treated vtc and rs cells. In summary, 24 h P-D acts via PRLR-L to attenuate ATP-induced [Ca2+]i and increase cAMP-activated Cl− transport. PRLR-S fine-tunes these responses underscoring its mammopoietic action.

scholarly journals The Xenopus tropicalis orthologue of TRPV3 is heat sensitive

2015 ◽  
Vol 146 (5) ◽  
pp. 411-421 ◽  
Author(s):  
Beiying Liu ◽  
Feng Qin
Keyword(s):  
Mammalian Cells ◽  
Xenopus Oocytes ◽  
Transient Receptor Potential ◽  
Trp Channels ◽  
Expression System ◽  
Receptor Potential ◽  
Functional Expression ◽  
Cold Sensitivity ◽  
Mammalian Cell Lines ◽  
Transient Receptor

Thermosensitive members of the transient receptor potential (TRP) family of ion channels (thermal TRP channels) play a crucial role in mammalian temperature sensing. Orthologues of these channels are present in lower vertebrates and, remarkably, some thermal TRP orthologues from different species appear to mediate opposing responses to temperature. For example, whereas the mammalian TRPV3 channel is activated by heat, frog TRPV3 is reportedly activated by cold. Intrigued by the potential implications of these opposing responses to temperature for the mechanism of temperature-dependent gating, we cloned Xenopus laevis TRPV3 and functionally expressed it in both mammalian cell lines and Xenopus oocytes. We found that, when expressed in mammalian cells, the recombinant channel lacks the reported cold sensitivity; rather, it is activated by temperatures >50°C. Furthermore, when expressed in mammalian cells, the frog orthologue shows other features characteristic of mammalian TRPV3, including activation by the agonist 2-aminoethoxydiphenyl borate and an increased response with repeated stimulation. We detected both heat- and cold-activated currents in Xenopus oocytes expressing the recombinant frog TRPV3 channel. However, cold-activated currents were also apparent in control oocytes lacking recombinant TRPV3. Our data indicate that frog TRPV3 resembles its mammalian orthologues in terms of its thermosensitivity and is intrinsically activated by heat. Thus, all known vanilloid receptors are activated by heat. Our data also show that Xenopus oocytes contain endogenous receptors that are activated by cold, and suggest that cold sensitivity of TRP channels established using Xenopus oocytes as a functional expression system may need to be revisited.

Glycosylation of the osmoresponsive transient receptor potential channel TRPV4 on Asn-651 influences membrane trafficking

2006 ◽  
Vol 290 (5) ◽  
pp. F1103-F1109 ◽  
Author(s):  
Hongshi Xu ◽  
Yi Fu ◽  
Wei Tian ◽  
David M. Cohen
Keyword(s):  
Plasma Membrane ◽  
Membrane Trafficking ◽  
Transient Receptor Potential ◽  
Receptor Potential ◽  
Trp Channel ◽  
Hek293 Cells ◽  
Wild Type ◽  
Functional Feature ◽  
Voltage Gated ◽  
Transient Receptor

We identified a consensus N-linked glycosylation motif within the pore-forming loop between the fifth and sixth transmembrane segments of the osmoresponsive transient receptor potential (TRP) channel TRPV4. Mutation of this residue from Asn to Gln (i.e., TRPV4N651Q) resulted in loss of a slower migrating band on anti-TRPV4 immunoblots and a marked reduction in lectin-precipitable TRPV4 immunoreactivity. HEK293 cells transiently transfected with the mutant TRPV4N651Q exhibited increased calcium entry in response to hypotonic stress relative to wild-type TRPV4 transfectants. This increase in hypotonicity responsiveness was associated with an increase in plasma membrane targeting of TRPV4N651Q relative to wild-type TRPV4 in both HEK293 and COS-7 cells but had no effect on overall channel abundance in whole cell lysates. Residue N651 of TRPV4 is immediately adjacent to the pore-forming loop. Although glycosylation in this vicinity has not been reported for a TRP channel, the structurally related hexahelical hyperpolarization-activated cyclic nucleotide-gated channel, HCN2, and the voltage-gated potassium channel, human ether-a-go-go-related (HERG), share a nearly identically situated and experimentally confirmed N-linked glycosylation site which promotes rather than limits channel insertion into the plasma membrane. These data point to a potentially conserved structural and functional feature influencing membrane trafficking across diverse members of the voltage-gated-like ion channel superfamily.

scholarly journals Cell-Derived Vesicles as TRPC1 Channel Delivery Systems for the Recovery of Cellular Respiratory and Proliferative Capacities

2020 ◽  
Author(s):  
Felix Kurth ◽  
Yee Kit Tai ◽  
Dinesh Parate ◽  
Marc van Oostrum ◽  
Yannick R. F. Schmid ◽  
...  
Keyword(s):  
Transient Receptor Potential ◽  
Trp Channels ◽  
Surface Membrane ◽  
Receptor Potential ◽  
Calcium Entry ◽  
Wild Type ◽  
Clonal Cell Lines ◽  
Cellular Machinery ◽  
Pulsed Electromagnetic ◽  
Transient Receptor

AbstractPulsed electromagnetic fields (PEMFs) are capable of specifically activating a TRPC1-mitochondrial axis underlying cell expansion and mitohormetic survival adaptations. This study characterizes cell-derived vesicles (CDVs) generated from C2C12 murine myoblasts and shows that they are equipped with the sufficient molecular machinery to confer mitochondrial respiratory capacity and associated proliferative responses upon their fusion with recipient cells. CDVs derived from wild type C2C12 myoblasts include the cation-permeable transient receptor potential (TRP) channels, TRPC1 and TRPA1, and directly respond to PEMF exposure with TRPC1-mediated calcium entry. By contrast, CDVs derived from C2C12 muscle cells in which TRPC1 had been genetically knocked-down using CRISPR/Cas9 genome editing, do not. Wild type C2C12-derived CDVs are also capable of restoring PEMF-induced proliferative and mitochondrial activation in two C2C12-derived TRPC1 knockdown clonal cell lines in accordance to their endogenous degree of TRPC1 suppression. C2C12 wild type CDVs respond to menthol with calcium entry and accumulation, likewise verifying TRPA1 functional gating and further corroborating compartmental integrity. Proteomic and lipidomic analyses confirm the surface membrane origin of the CDVs providing an initial indication of the minimal cellular machinery required to recover mitochondrial function. CDVs hence possess the potential of restoring respiratory and proliferative capacities to senescent cells and tissues.

scholarly journals Trigeminal Neuralgia TRPM8 Mutation

2021 ◽  
Vol 7 (1) ◽  
pp. e550
Author(s):  
Roberta Gualdani ◽  
Jun-Hui Yuan ◽  
Philip R. Effraim ◽  
Giulia Di Stefano ◽  
Andrea Truini ◽  
...  
Keyword(s):  
Trigeminal Neuralgia ◽  
Transient Receptor Potential ◽  
Receptor Potential ◽  
Nonselective Cation Channel ◽  
Patch Clamp Recording ◽  
Mutant Channel ◽  
Whole Cell Patch Clamp ◽  
Transient Receptor Potential Melastatin ◽  
Intracellular Ca ◽  
Transient Receptor

ObjectiveTo assess the functional effects of a variant, c.89 G > A (p.Arg30Gln), in the transient receptor potential melastatin 8 (TRPM8) cold-sensing, nonselective cation channel, which we have previously identified in a patient with familial trigeminal neuralgia.MethodsWe carried out Ca2+ imaging and whole-cell patch-clamp recording.ResultsThe TRPM8 mutation enhances channel activation, increases basal current amplitude and intracellular [Ca2+] in cells carrying the mutant channel, and enhances the response to menthol.ConclusionsWe propose that Arg30Gln confers gain-of-function attributes on TRPM8, which contribute to pathogenesis of trigeminal neuralgia in patients carrying this mutation.

scholarly journals Drosophila menthol sensitivity and the Precambrian origins of TRP-dependent chemosensation

2019 ◽  
Author(s):  
Nathaniel J. Himmel ◽  
Jamin M. Letcher ◽  
Akira Sakurai ◽  
Thomas R. Gray ◽  
Maggie N. Benson ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Topical Application ◽  
Transient Receptor Potential ◽  
Trp Channels ◽  
Receptor Potential ◽  
Cation Channels ◽  
Growing Body ◽  
Sensitivity Studies ◽  
Transient Receptor ◽  
Class Iv

AbstractTransient receptor potential (TRP) cation channels are highly conserved, polymodal sensors which respond to a wide variety of stimuli. Perhaps most notably, TRP channels serve critical functions in nociception and pain. A growing body of evidence suggests that TRPM (Melastatin) and TRPA (Ankyrin) thermal and electrophile sensitivities predate the protostome-deuterostome split (>550 million years ago). However, TRPM and TRPA channels are also thought to detect modified terpenes (e.g., menthol). Although terpenoids like menthol are thought to be aversive and/or harmful to insects, mechanistic sensitivity studies have been largely restricted to chordates. Furthermore, it is unknown if TRP-menthol sensing is as ancient as thermal and/or electrophile sensitivity. Combining genetic, optical, electrophysiological, behavioural, and phylogenetic approaches, we tested the hypothesis that insect TRP channels play a conserved role in menthol sensing. We found that topical application of menthol to Drosophila melanogaster larvae elicits a Trpm- and TrpA1-dependent nocifensive rolling behaviour, which requires activation of Class IV nociceptor neurons. Further, in characterizing the evolution of TRP channels, we put forth the hypotheses that 3 previously undescribed TRPM channel clades (basal, αTRPM, and βTRPM), as well as TRPs with residues critical for menthol sensing, were present in ancestral bilaterians.

Sign in / Sign up

Export Citation Format

Share Document