Loading Pathway...
Error: Pathway image not found.
Hide
Pathway Description
Droxidopa B1-Adrenergic Cardiac Muscle Contraction Action Pathway
Homo sapiens
Category:
Metabolite Pathway
Sub-Category:
Drug Action
Created: 2023-05-18
Last Updated: 2023-10-25
Droxidopa is a medication used to treat symptomatic neurogenic orthostatic hypotension (nOH) caused by dopamine beta-hydroxylase deficiency, non-diabetic autonomic neuropathy and primary autonomic failure caused by conditions such as Parkinson's disease. Droxidopa is a precursor of noradrenaline that is used in the treatment of Parkinsonism. Droxidopa is an orally active synthetic precursor of norepinephrine that increases the deficient supply of norepinephrine in patients with NOH, thereby improving orthostatic blood pressure and alleviating associated symptoms of lightheadedness, dizziness, blurred vision, and syncope through the induction of tachycardia (increased heart rate) and hypertension.
Through the beta-1 adrenergic receptor, the heart is stimulated by norepinephrine. Droxidopa crosses the blood-brain barrier where it is converted to norepinephrine via decarboxylation by L-aromatic-amino-acid decarboxylase. Norepinephrine is stored in synaptic storage sites where norepinephrine was already being stored. When the neuron is depolarized, this accumulation of norepinephrine is released into the synapse. The norepinephrine activates Beta-1 adrenergic receptor which is coupled to the G-protein signalling cascade. Activation of the receptor activates the cascade which leads to activated protein kinase through activation of adenylate cyclase. Protein kinase activates calcium channels in the membrane, causing the channels to open and allow Ca2+ into the cell. This causes a high concentration of Ca2+ to be present in the cardiomyocyte which activates activates the ryanodine receptor on the sarcoplasmic reticulum. This transports more Ca2+ into the cytosol. The high concentration of Ca2+ binds to troponin to cause cardiac muscle contractions and therefore, an increased heart rate.
Some side effects of using droxidopa may include headache, dizziness, nausea, high blood pressure, and fainting.
References
Droxidopa B1-Adrenergic Cardiac Muscle Contraction Pathway References
Wishart DS, Feunang YD, Guo AC, Lo EJ, Marcu A, Grant JR, Sajed T, Johnson D, Li C, Sayeeda Z, Assempour N, Iynkkaran I, Liu Y, Maciejewski A, Gale N, Wilson A, Chin L, Cummings R, Le D, Pon A, Knox C, Wilson M: DrugBank 5.0: a major update to the DrugBank database for 2018. Nucleic Acids Res. 2018 Jan 4;46(D1):D1074-D1082. doi: 10.1093/nar/gkx1037.
Pubmed: 29126136
Sakuntabhai A, Burge S, Monk S, Hovnanian A: Spectrum of novel ATP2A2 mutations in patients with Darier's disease. Hum Mol Genet. 1999 Sep;8(9):1611-9. doi: 10.1093/hmg/8.9.1611.
Pubmed: 10441323
Ruiz-Perez VL, Carter SA, Healy E, Todd C, Rees JL, Steijlen PM, Carmichael AJ, Lewis HM, Hohl D, Itin P, Vahlquist A, Gobello T, Mazzanti C, Reggazini R, Nagy G, Munro CS, Strachan T: ATP2A2 mutations in Darier's disease: variant cutaneous phenotypes are associated with missense mutations, but neuropsychiatric features are independent of mutation class. Hum Mol Genet. 1999 Sep;8(9):1621-30. doi: 10.1093/hmg/8.9.1621.
Pubmed: 10441324
Lytton J, MacLennan DH: Molecular cloning of cDNAs from human kidney coding for two alternatively spliced products of the cardiac Ca2+-ATPase gene. J Biol Chem. 1988 Oct 15;263(29):15024-31.
Pubmed: 2844796
Surratt CK, Persico AM, Yang XD, Edgar SR, Bird GS, Hawkins AL, Griffin CA, Li X, Jabs EW, Uhl GR: A human synaptic vesicle monoamine transporter cDNA predicts posttranslational modifications, reveals chromosome 10 gene localization and identifies TaqI RFLPs. FEBS Lett. 1993 Mar 8;318(3):325-30. doi: 10.1016/0014-5793(93)80539-7.
Pubmed: 8095030
Erickson JD, Eiden LE: Functional identification and molecular cloning of a human brain vesicle monoamine transporter. J Neurochem. 1993 Dec;61(6):2314-7. doi: 10.1111/j.1471-4159.1993.tb07476.x.
Pubmed: 8245983
Peter D, Finn JP, Klisak I, Liu Y, Kojis T, Heinzmann C, Roghani A, Sparkes RS, Edwards RH: Chromosomal localization of the human vesicular amine transporter genes. Genomics. 1993 Dec;18(3):720-3.
Pubmed: 7905859
Pacholczyk T, Blakely RD, Amara SG: Expression cloning of a cocaine- and antidepressant-sensitive human noradrenaline transporter. Nature. 1991 Mar 28;350(6316):350-4. doi: 10.1038/350350a0.
Pubmed: 2008212
Porzgen P, Bonisch H, Bruss M: Molecular cloning and organization of the coding region of the human norepinephrine transporter gene. Biochem Biophys Res Commun. 1995 Oct 24;215(3):1145-50. doi: 10.1006/bbrc.1995.2582.
Pubmed: 7488042
Porzgen P, Bonisch H, Hammermann R, Bruss M: The human noradrenaline transporter gene contains multiple polyadenylation sites and two alternatively spliced C-terminal exons. Biochim Biophys Acta. 1998 Jul 9;1398(3):365-70. doi: 10.1016/s0167-4781(98)00072-4.
Pubmed: 9655936
Komuro I, Wenninger KE, Philipson KD, Izumo S: Molecular cloning and characterization of the human cardiac Na+/Ca2+ exchanger cDNA. Proc Natl Acad Sci U S A. 1992 May 15;89(10):4769-73. doi: 10.1073/pnas.89.10.4769.
Pubmed: 1374913
Van Eylen F, Bollen A, Herchuelz A: NCX1 Na/Ca exchanger splice variants in pancreatic islet cells. J Endocrinol. 2001 Mar;168(3):517-26. doi: 10.1677/joe.0.1680517.
Pubmed: 11241183
Ota T, Suzuki Y, Nishikawa T, Otsuki T, Sugiyama T, Irie R, Wakamatsu A, Hayashi K, Sato H, Nagai K, Kimura K, Makita H, Sekine M, Obayashi M, Nishi T, Shibahara T, Tanaka T, Ishii S, Yamamoto J, Saito K, Kawai Y, Isono Y, Nakamura Y, Nagahari K, Murakami K, Yasuda T, Iwayanagi T, Wagatsuma M, Shiratori A, Sudo H, Hosoiri T, Kaku Y, Kodaira H, Kondo H, Sugawara M, Takahashi M, Kanda K, Yokoi T, Furuya T, Kikkawa E, Omura Y, Abe K, Kamihara K, Katsuta N, Sato K, Tanikawa M, Yamazaki M, Ninomiya K, Ishibashi T, Yamashita H, Murakawa K, Fujimori K, Tanai H, Kimata M, Watanabe M, Hiraoka S, Chiba Y, Ishida S, Ono Y, Takiguchi S, Watanabe S, Yosida M, Hotuta T, Kusano J, Kanehori K, Takahashi-Fujii A, Hara H, Tanase TO, Nomura Y, Togiya S, Komai F, Hara R, Takeuchi K, Arita M, Imose N, Musashino K, Yuuki H, Oshima A, Sasaki N, Aotsuka S, Yoshikawa Y, Matsunawa H, Ichihara T, Shiohata N, Sano S, Moriya S, Momiyama H, Satoh N, Takami S, Terashima Y, Suzuki O, Nakagawa S, Senoh A, Mizoguchi H, Goto Y, Shimizu F, Wakebe H, Hishigaki H, Watanabe T, Sugiyama A, Takemoto M, Kawakami B, Yamazaki M, Watanabe K, Kumagai A, Itakura S, Fukuzumi Y, Fujimori Y, Komiyama M, Tashiro H, Tanigami A, Fujiwara T, Ono T, Yamada K, Fujii Y, Ozaki K, Hirao M, Ohmori Y, Kawabata A, Hikiji T, Kobatake N, Inagaki H, Ikema Y, Okamoto S, Okitani R, Kawakami T, Noguchi S, Itoh T, Shigeta K, Senba T, Matsumura K, Nakajima Y, Mizuno T, Morinaga M, Sasaki M, Togashi T, Oyama M, Hata H, Watanabe M, Komatsu T, Mizushima-Sugano J, Satoh T, Shirai Y, Takahashi Y, Nakagawa K, Okumura K, Nagase T, Nomura N, Kikuchi H, Masuho Y, Yamashita R, Nakai K, Yada T, Nakamura Y, Ohara O, Isogai T, Sugano S: Complete sequencing and characterization of 21,243 full-length human cDNAs. Nat Genet. 2004 Jan;36(1):40-5. doi: 10.1038/ng1285. Epub 2003 Dec 21.
Pubmed: 14702039
Bagattin A, Veronese C, Rampazzo A, Danieli GA: Gene symbol: RYR2. Disease: Effort-induced polymorphic ventricular arrhythmias. Hum Genet. 2004 Mar;114(4):404.
Pubmed: 15046072
Tunwell RE, Wickenden C, Bertrand BM, Shevchenko VI, Walsh MB, Allen PD, Lai FA: The human cardiac muscle ryanodine receptor-calcium release channel: identification, primary structure and topological analysis. Biochem J. 1996 Sep 1;318 ( Pt 2):477-87. doi: 10.1042/bj3180477.
Pubmed: 8809036
Tiso N, Stephan DA, Nava A, Bagattin A, Devaney JM, Stanchi F, Larderet G, Brahmbhatt B, Brown K, Bauce B, Muriago M, Basso C, Thiene G, Danieli GA, Rampazzo A: Identification of mutations in the cardiac ryanodine receptor gene in families affected with arrhythmogenic right ventricular cardiomyopathy type 2 (ARVD2). Hum Mol Genet. 2001 Feb 1;10(3):189-94. doi: 10.1093/hmg/10.3.189.
Pubmed: 11159936
Soldatov NM: Molecular diversity of L-type Ca2+ channel transcripts in human fibroblasts. Proc Natl Acad Sci U S A. 1992 May 15;89(10):4628-32. doi: 10.1073/pnas.89.10.4628.
Pubmed: 1316612
Schultz D, Mikala G, Yatani A, Engle DB, Iles DE, Segers B, Sinke RJ, Weghuis DO, Klockner U, Wakamori M, et al.: Cloning, chromosomal localization, and functional expression of the alpha 1 subunit of the L-type voltage-dependent calcium channel from normal human heart. Proc Natl Acad Sci U S A. 1993 Jul 1;90(13):6228-32. doi: 10.1073/pnas.90.13.6228.
Pubmed: 8392192
Soldatov NM: Genomic structure of human L-type Ca2+ channel. Genomics. 1994 Jul 1;22(1):77-87. doi: 10.1006/geno.1994.1347.
Pubmed: 7959794
Klugbauer N, Lacinova L, Marais E, Hobom M, Hofmann F: Molecular diversity of the calcium channel alpha2delta subunit. J Neurosci. 1999 Jan 15;19(2):684-91.
Pubmed: 9880589
Gao B, Sekido Y, Maximov A, Saad M, Forgacs E, Latif F, Wei MH, Lerman M, Lee JH, Perez-Reyes E, Bezprozvanny I, Minna JD: Functional properties of a new voltage-dependent calcium channel alpha(2)delta auxiliary subunit gene (CACNA2D2). J Biol Chem. 2000 Apr 21;275(16):12237-42. doi: 10.1074/jbc.275.16.12237.
Pubmed: 10766861
Hobom M, Dai S, Marais E, Lacinova L, Hofmann F, Klugbauer N: Neuronal distribution and functional characterization of the calcium channel alpha2delta-2 subunit. Eur J Neurosci. 2000 Apr;12(4):1217-26. doi: 10.1046/j.1460-9568.2000.01009.x.
Pubmed: 10762351
Powers PA, Liu S, Hogan K, Gregg RG: Skeletal muscle and brain isoforms of a beta-subunit of human voltage-dependent calcium channels are encoded by a single gene. J Biol Chem. 1992 Nov 15;267(32):22967-72.
Pubmed: 1385409
Williams ME, Feldman DH, McCue AF, Brenner R, Velicelebi G, Ellis SB, Harpold MM: Structure and functional expression of alpha 1, alpha 2, and beta subunits of a novel human neuronal calcium channel subtype. Neuron. 1992 Jan;8(1):71-84. doi: 10.1016/0896-6273(92)90109-q.
Pubmed: 1309651
Collin T, Wang JJ, Nargeot J, Schwartz A: Molecular cloning of three isoforms of the L-type voltage-dependent calcium channel beta subunit from normal human heart. Circ Res. 1993 Jun;72(6):1337-44. doi: 10.1161/01.res.72.6.1337.
Pubmed: 7916667
Denier C, Ducros A, Durr A, Eymard B, Chassande B, Tournier-Lasserve E: Missense CACNA1A mutation causing episodic ataxia type 2. Arch Neurol. 2001 Feb;58(2):292-5. doi: 10.1001/archneur.58.2.292.
Pubmed: 11176968
Hans M, Urrutia A, Deal C, Brust PF, Stauderman K, Ellis SB, Harpold MM, Johnson EC, Williams ME: Structural elements in domain IV that influence biophysical and pharmacological properties of human alpha1A-containing high-voltage-activated calcium channels. Biophys J. 1999 Mar;76(3):1384-400. doi: 10.1016/S0006-3495(99)77300-5.
Pubmed: 10049321
Ophoff RA, Terwindt GM, Vergouwe MN, van Eijk R, Oefner PJ, Hoffman SM, Lamerdin JE, Mohrenweiser HW, Bulman DE, Ferrari M, Haan J, Lindhout D, van Ommen GJ, Hofker MH, Ferrari MD, Frants RR: Familial hemiplegic migraine and episodic ataxia type-2 are caused by mutations in the Ca2+ channel gene CACNL1A4. Cell. 1996 Nov 1;87(3):543-52. doi: 10.1016/s0092-8674(00)81373-2.
Pubmed: 8898206
Highlighted elements will appear in red.
Highlight Compounds
Highlight Proteins
Enter relative concentration values (without units). Elements will be highlighted in a color gradient where red = lowest concentration and green = highest concentration. For the best results, view the pathway in Black and White.
Visualize Compound Data
Visualize Protein Data
Downloads
Settings