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    Anthony Baker, PhD

    TitleProfessor
    SchoolUCSF School of Medicine
    DepartmentMedicine
    Address4150 Clement St
    San Francisco CA 94121
    Phone415-221-4810x4790
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      Anthony J. Baker, Ph.D. has a longstanding interest in the cellular and molecular mechanisms that regulate cardiac muscle contraction in health and disease. We use multiple approaches to monitor cardiac function in experimental preparations that span a range of complexity from contraction of myofilaments in-vitro, intact single cells, electrically stimulated intact cardiac muscle, intact hearts in-vitro, and intact hearts in-vivo. A major goal is to investigate new therapies to treat heart failure.

      Heart failure is a leading cause of death and disability and new therapies are needed to treat this devastating disease. Research in the Baker lab focuses on both of the major pumping chambers of the heart, the left ventricle (LV) and right ventricle (RV).

      We are investigating the mechanisms causing failure of the LV subsequent to a heart attack, where blood flow stops to a region of the heart resulting in death of muscle cells in that region, termed a myocardial infarction (MI). We are studying the weakened border-zone immediately adjacent to the MI. We are investigating the mechanisms that cause gradual enlargement of this weakened border-zone, ultimately leading to dilation of the heart and LV failure. We are investigating treatments to stabilize the border-zone to slow or halt the progression to heart failure after MI.

      We are also investigating the mechanisms involved in failure of the RV. RV failure is relatively understudied and poorly understood. It has been assumed that an understanding of RV failure can be extrapolated from studies of LV failure. In contrast, we have found that the RV has distinctive properties compared to the LV, and the regulation of RV contraction in heart failure differs compared to the failing LV, suggesting that treatment strategies for the failing RV should be tailored to the distinctive biology of the RV.


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      Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help.
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      1. Thomas RC, Cowley PM, Singh A, Myagmar BE, Swigart PM, Baker AJ, Simpson PC. The Alpha-1A Adrenergic Receptor in the Rabbit Heart. PLoS One. 2016; 11(6):e0155238. PMID: 27258143.
        View in: PubMed
      2. Thomas RC, Singh A, Cowley P, Myagmar BE, Montgomery MD, Swigart PM, De Marco T, Baker AJ, Simpson PC. A Myocardial Slice Culture Model Reveals Alpha-1A-Adrenergic Receptor Signaling in the Human Heart. JACC Basic Transl Sci. 2016 Apr; 1(3):155-167. PMID: 27453955.
        View in: PubMed
      3. Cowley PM, Wang G, Chang AN, Makwana O, Swigart PM, Lovett DH, Stull JT, Simpson PC, Baker AJ. The a1A-adrenergic receptor subtype mediates increased contraction of failing right ventricular myocardium. Am J Physiol Heart Circ Physiol. 2015 Sep; 309(5):H888-96. PMID: 26116709; PMCID: PMC4591405 [Available on 09/01/16].
      4. Chang AN, Battiprolu PK, Cowley PM, Chen G, Gerard RD, Pinto JR, Hill JA, Baker AJ, Kamm KE, Stull JT. Constitutive phosphorylation of cardiac myosin regulatory light chain in vivo. J Biol Chem. 2015 Apr 24; 290(17):10703-16. PMID: 25733667; PMCID: PMC4409237 [Available on 04/24/16].
      5. Lovett DH, Chu C, Wang G, Ratcliffe MB, Baker AJ. A N-terminal truncated intracellular isoform of matrix metalloproteinase-2 impairs contractility of mouse myocardium. Front Physiol. 2014; 5:363. PMID: 25309453; PMCID: PMC4174733.
      6. Shimkunas R, Makwana O, Spaulding K, Bazargan M, Khazalpour M, Takaba K, Soleimani M, Myagmar BE, Lovett DH, Simpson PC, Ratcliffe MB, Baker AJ. Myofilament dysfunction contributes to impaired myocardial contraction in the infarct border zone. Am J Physiol Heart Circ Physiol. 2014 Oct 15; 307(8):H1150-8. PMID: 25128171; PMCID: PMC4200338.
      7. Baker AJ. Adrenergic signaling in heart failure: a balance of toxic and protective effects. Pflugers Arch. 2014 Jun; 466(6):1139-50. PMID: 24623099.
        View in: PubMed
      8. O'Connell TD, Jensen BC, Baker AJ, Simpson PC. Cardiac alpha1-adrenergic receptors: novel aspects of expression, signaling mechanisms, physiologic function, and clinical importance. Pharmacol Rev. 2014; 66(1):308-33. PMID: 24368739; PMCID: PMC3880467.
      9. Lovett DH, Mahimkar R, Raffai RL, Cape L, Zhu BQ, Jin ZQ, Baker AJ, Karliner JS. N-terminal truncated intracellular matrix metalloproteinase-2 induces cardiomyocyte hypertrophy, inflammation and systolic heart failure. PLoS One. 2013; 8(7):e68154. PMID: 23874529; PMCID: PMC3712965.
      10. Shimkunas R, Zhang Z, Wenk JF, Soleimani M, Khazalpour M, Acevedo-Bolton G, Wang G, Saloner D, Mishra R, Wallace AW, Ge L, Baker AJ, Guccione JM, Ratcliffe MB. Left ventricular myocardial contractility is depressed in the borderzone after posterolateral myocardial infarction. Ann Thorac Surg. 2013 May; 95(5):1619-25. PMID: 23523189; PMCID: PMC3640420.
      11. Chu C, Thai K, Park KW, Wang P, Makwana O, Lovett DH, Simpson PC, Baker AJ. Intraventricular and interventricular cellular heterogeneity of inotropic responses to a(1)-adrenergic stimulation. Am J Physiol Heart Circ Physiol. 2013 Apr 1; 304(7):H946-53. PMID: 23355341; PMCID: PMC3625891.
      12. Zhang Z, Sun K, Saloner DA, Wallace AW, Ge L, Baker AJ, Guccione JM, Ratcliffe MB. The benefit of enhanced contractility in the infarct borderzone: a virtual experiment. Front Physiol. 2012; 3:86. PMID: 22509168; PMCID: PMC3321638.
      13. Baker AJ. Refueling the heart: Using 2-deoxy-ATP to enhance cardiac contractility. J Mol Cell Cardiol. 2011 Dec; 51(6):883-4. PMID: 22001677.
        View in: PubMed
      14. Oishi PE, Cholsiripunlert S, Gong W, Baker AJ, Bernstein HS. Myo-mechanical analysis of isolated skeletal muscle. J Vis Exp. 2011; (48). PMID: 21403622; PMCID: PMC3164512.
      15. Yeh CC, Li H, Malhotra D, Turcato S, Nicholas S, Tu R, Zhu BQ, Cha J, Swigart PM, Myagmar BE, Baker AJ, Simpson PC, Mann MJ. Distinctive ERK and p38 signaling in remote and infarcted myocardium during post-MI remodeling in the mouse. J Cell Biochem. 2010 Apr 15; 109(6):1185-91. PMID: 20186881; PMCID: PMC3397305.
      16. Wang GY, Yeh CC, Jensen BC, Mann MJ, Simpson PC, Baker AJ. Heart failure switches the RV alpha1-adrenergic inotropic response from negative to positive. Am J Physiol Heart Circ Physiol. 2010 Mar; 298(3):H913-20. PMID: 20035030; PMCID: PMC2838546.
      17. Sun K, Stander N, Jhun CS, Zhang Z, Suzuki T, Wang GY, Saeed M, Wallace AW, Tseng EE, Baker AJ, Saloner D, Einstein DR, Ratcliffe MB, Guccione JM. A computationally efficient formal optimization of regional myocardial contractility in a sheep with left ventricular aneurysm. J Biomech Eng. 2009 Nov; 131(11):111001. PMID: 20016753.
        View in: PubMed
      18. McCloskey DT, Turcato S, Wang GY, Turnbull L, Zhu BQ, Bambino T, Nguyen AP, Lovett DH, Nissenson RA, Karliner JS, Baker AJ. Expression of a Gi-coupled receptor in the heart causes impaired Ca2+ handling, myofilament injury, and dilated cardiomyopathy. Am J Physiol Heart Circ Physiol. 2008 Jan; 294(1):H205-12. PMID: 17965283; PMCID: PMC3372085.
      19. Zhou HZ, Ma X, Gray MO, Zhu BQ, Nguyen AP, Baker AJ, Simonis U, Cecchini G, Lovett DH, Karliner JS. Transgenic MMP-2 expression induces latent cardiac mitochondrial dysfunction. Biochem Biophys Res Commun. 2007 Jun 22; 358(1):189-95. PMID: 17475219; PMCID: PMC3423089.
      20. Wang GY, McCloskey DT, Turcato S, Swigart PM, Simpson PC, Baker AJ. Contrasting inotropic responses to alpha1-adrenergic receptor stimulation in left versus right ventricular myocardium. Am J Physiol Heart Circ Physiol. 2006 Oct; 291(4):H2013-7. PMID: 16731650.
        View in: PubMed
      21. O'Connell TD, Swigart PM, Rodrigo MC, Ishizaka S, Joho S, Turnbull L, Tecott LH, Baker AJ, Foster E, Grossman W, Simpson PC. Alpha1-adrenergic receptors prevent a maladaptive cardiac response to pressure overload. J Clin Invest. 2006 Apr; 116(4):1005-15. PMID: 16585965; PMCID: PMC1421341.
      22. Turcato S, Turnbull L, Wang GY, Honbo N, Simpson PC, Karliner JS, Baker AJ. Ischemic preconditioning depends on age and gender. Basic Res Cardiol. 2006 May; 101(3):235-43. PMID: 16450074.
        View in: PubMed
      23. Turnbull L, Zhou HZ, Swigart PM, Turcato S, Karliner JS, Conklin BR, Simpson PC, Baker AJ. Sustained preconditioning induced by cardiac transgenesis with the tetracycline transactivator. Am J Physiol Heart Circ Physiol. 2006 Mar; 290(3):H1103-9. PMID: 16243914.
        View in: PubMed
      24. Wang GY, Bergman MR, Nguyen AP, Turcato S, Swigart PM, Rodrigo MC, Simpson PC, Karliner JS, Lovett DH, Baker AJ. Cardiac transgenic matrix metalloproteinase-2 expression directly induces impaired contractility. Cardiovasc Res. 2006 Feb 15; 69(3):688-96. PMID: 16183043.
        View in: PubMed
      25. McCloskey DT, Turnbull L, Swigart PM, Zambon AC, Turcato S, Joho S, Grossman W, Conklin BR, Simpson PC, Baker AJ. Cardiac transgenesis with the tetracycline transactivator changes myocardial function and gene expression. Physiol Genomics. 2005 Jun 16; 22(1):118-26. PMID: 15797971.
        View in: PubMed
      26. McCloskey DT, Turnbull L, Swigart P, O'Connell TD, Simpson PC, Baker AJ. Abnormal myocardial contraction in alpha(1A)- and alpha(1B)-adrenoceptor double-knockout mice. J Mol Cell Cardiol. 2003 Oct; 35(10):1207-16. PMID: 14519431.
        View in: PubMed
      27. Turnbull L, McCloskey DT, O'Connell TD, Simpson PC, Baker AJ. Alpha 1-adrenergic receptor responses in alpha 1AB-AR knockout mouse hearts suggest the presence of alpha 1D-AR. Am J Physiol Heart Circ Physiol. 2003 Apr; 284(4):H1104-9. PMID: 12595294.
        View in: PubMed
      28. McCloskey DT, Rokosh DG, O'Connell TD, Keung EC, Simpson PC, Baker AJ. Alpha(1)-adrenoceptor subtypes mediate negative inotropy in myocardium from alpha(1A/C)-knockout and wild type mice. J Mol Cell Cardiol. 2002 Aug; 34(8):1007-17. PMID: 12234770.
        View in: PubMed
      29. Baker AJ, Redfern CH, Harwood MD, Simpson PC, Conklin BR. Abnormal contraction caused by expression of G(i)-coupled receptor in transgenic model of dilated cardiomyopathy. Am J Physiol Heart Circ Physiol. 2001 Apr; 280(4):H1653-9. PMID: 11247776.
        View in: PubMed
      30. Redfern CH, Degtyarev MY, Kwa AT, Salomonis N, Cotte N, Nanevicz T, Fidelman N, Desai K, Vranizan K, Lee EK, Coward P, Shah N, Warrington JA, Fishman GI, Bernstein D, Baker AJ, Conklin BR. Conditional expression of a Gi-coupled receptor causes ventricular conduction delay and a lethal cardiomyopathy. Proc Natl Acad Sci U S A. 2000 Apr 25; 97(9):4826-31. PMID: 10781088; PMCID: PMC18317.
      31. Halow JM, Figueredo VM, Shames DM, Camacho SA, Baker AJ. Role of slowed Ca(2+) transient decline in slowed relaxation during myocardial ischemia. J Mol Cell Cardiol. 1999 Sep; 31(9):1739-48. PMID: 10471357.
        View in: PubMed
      32. Baker AJ. Cellular and extracellular mechanisms causing myocardial stunning. J Am Coll Cardiol. 1999 Aug; 34(2):603-5. PMID: 10440179.
        View in: PubMed
      33. Baker AJ, Figueredo VM, Keung EC, Camacho SA. Ca2+ regulates the kinetics of tension development in intact cardiac muscle. Am J Physiol. 1998 Sep; 275(3 Pt 2):H744-50. PMID: 9724275.
        View in: PubMed
      34. Figueredo VM, Chang KC, Baker AJ, Camacho SA. Chronic alcohol-induced changes in cardiac contractility are not due to changes in the cytosolic Ca2+ transient. Am J Physiol. 1998 Jul; 275(1 Pt 2):H122-30. PMID: 9688904.
        View in: PubMed
      35. Baker AJ, Weiner MW. Force decline during muscle relaxation promotes calcium release to the cytosol. Am J Physiol. 1997 Jul; 273(1 Pt 1):C85-91. PMID: 9252445.
        View in: PubMed
      36. Shames DM, Baker AJ, Weiner MW, Camacho SA. Ca(2+)-force relationship of frog skeletal muscle: a dynamic model for parameter estimation. Am J Physiol. 1996 Dec; 271(6 Pt 1):C2062-71. PMID: 8997209.
        View in: PubMed
      37. Schreur JH, Figueredo VM, Miyamae M, Shames DM, Baker AJ, Camacho SA. Cytosolic and mitochondrial [Ca2+] in whole hearts using indo-1 acetoxymethyl ester: effects of high extracellular Ca2+. Biophys J. 1996 Jun; 70(6):2571-80. PMID: 8744296; PMCID: PMC1225238.
      38. Zhao L, Pate E, Baker AJ, Cooke R. The myosin catalytic domain does not rotate during the working power stroke. Biophys J. 1995 Sep; 69(3):994-9. PMID: 8519999; PMCID: PMC1236328.
      39. Baker AJ, Brandes R, Weiner MW. Effects of intracellular acidosis on Ca2+ activation, contraction, and relaxation of frog skeletal muscle. Am J Physiol. 1995 Jan; 268(1 Pt 1):C55-63. PMID: 7840160.
        View in: PubMed
      40. Miller RG, Carson PJ, Moussavi RS, Green A, Baker A, Boska MD, Weiner MW. Factors which influence alterations of phosphates and pH in exercising human skeletal muscle: measurement error, reproducibility, and effects of fasting, carbohydrate loading, and metabolic acidosis. Muscle Nerve. 1995 Jan; 18(1):60-7. PMID: 7799999.
        View in: PubMed
      41. Baker AJ, Brandes R, Schreur JH, Camacho SA, Weiner MW. Protein and acidosis alter calcium-binding and fluorescence spectra of the calcium indicator indo-1. Biophys J. 1994 Oct; 67(4):1646-54. PMID: 7819496; PMCID: PMC1225526.
      42. Baker AJ, Carson PJ, Miller RG, Weiner MW. Metabolic and nonmetabolic components of fatigue monitored with 31P-NMR. Muscle Nerve. 1994 Sep; 17(9):1002-9. PMID: 8065387.
        View in: PubMed
      43. Baker AJ, Brandes R, Schendel TM, Trocha SD, Miller RG, Weiner MW. Energy use by contractile and noncontractile processes in skeletal muscle estimated by 31P-NMR. Am J Physiol. 1994 Mar; 266(3 Pt 1):C825-31. PMID: 8166246.
        View in: PubMed
      44. Brandes R, Figueredo VM, Camacho SA, Baker AJ, Weiner MW. Quantitation of cytosolic [Ca2+] in whole perfused rat hearts using Indo-1 fluorometry. Biophys J. 1993 Nov; 65(5):1973-82. PMID: 8298027; PMCID: PMC1225933.
      45. Brandes R, Figueredo VM, Camacho SA, Baker AJ, Weiner MW. Investigation of factors affecting fluorometric quantitation of cytosolic [Ca2+] in perfused hearts. Biophys J. 1993 Nov; 65(5):1983-93. PMID: 8298028; PMCID: PMC1225934.
      46. Baker AJ, Kostov KG, Miller RG, Weiner MW. Slow force recovery after long-duration exercise: metabolic and activation factors in muscle fatigue. J Appl Physiol (1985). 1993 May; 74(5):2294-300. PMID: 8335559.
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      47. Baker AJ, Longuemare MC, Brandes R, Weiner MW. Intracellular tetanic calcium signals are reduced in fatigue of whole skeletal muscle. Am J Physiol. 1993 Mar; 264(3 Pt 1):C577-82. PMID: 8460665.
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      48. Gordon L, Levinsohn DG, Borowsky CD, Manojlovic RD, Sessler DI, Weiner MW, Baker AJ. Improved preservation of skeletal muscle in amputated limbs using pulsatile hypothermic perfusion with University of Wisconsin solution. A preliminary study. J Bone Joint Surg Am. 1992 Oct; 74(9):1358-66. PMID: 1429791.
        View in: PubMed
      49. Baker AJ, Carson PJ, Green AT, Miller RG, Weiner MW. Influence of human muscle length on energy transduction studied by 31P-NMR. J Appl Physiol (1985). 1992 Jul; 73(1):160-5. PMID: 1506363.
        View in: PubMed
      50. Miller RG, Carson PJ, Moussavi RS, Green AT, Baker AJ, Weiner MW. Fatigue and myalgia in AIDS patients. Neurology. 1991 Oct; 41(10):1603-7. PMID: 1922802.
        View in: PubMed
      51. Weiner MW, Moussavi RS, Baker AJ, Boska MD, Miller RG. Constant relationships between force, phosphate concentration, and pH in muscles with differential fatigability. Neurology. 1990 Dec; 40(12):1888-93. PMID: 2247239.
        View in: PubMed
      52. Baker AJ, Carson PJ, Miller RG, Weiner MW. Investigations of muscle bioenergetics with 31P NMR. Invest Radiol. 1989 Dec; 24(12):1001-5. PMID: 2691438.
        View in: PubMed
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