Jim Trimmer

image of Jim Trimmer



Physiology and Membrane Biology
Neurobiology, Physiology and Behavior

Offices and Labs

1163 Life Sciences
(530) 754-6075
1107/1111 Life Sciences
(530) 754-6076
UC Davis/NIH NeuroMab Facility-177 Hutchison
(530) 752-2972


1987 PhD (Marine Biology) University of California, San Diego/Scripps Inst. Oceanography
1981 BA (Biology) University of California, San Diego

Research Interests

Cell signaling in mammalian neurons, neuronal cell biology, membrane protein trafficking and function, affinity reagent development and validation



2000-2007 Jacob Javits Neuroscience Investigator (MERIT) Award, National Institute of Neurological Disorders and Stroke, National Institutes of Health
1994-1999 Established Investigatorship, American Heart Association

Department and Center Affiliations

Department of Physiology and Membrane Biology, School of Medicine
Director, UC Davis/NIH NeuroMab Facility (neuromab.ucdavis.edu)
Director, T32 Training Program in Molecular and Cellular Biology
Center for Neuroscience


Society for Neuroscience
American Society for Cell Biology
Biophysical Society
American Physiological Society

CBS Grad Group Affiliations

Biochemistry, Molecular, Cellular and Developmental Biology
Molecular, Cellular, and Integrative Physiology

Specialties / Focus

Biochemistry, Molecular, Cellular and Developmental Biology
  • Genomics, Proteomics and Metabolomics
  • Cell Biology


Trimmer lab-1107/1111 Life Sciences
  • Douglas Bi (junior specialist), Jie-Xian Dong (postdoc), Yongam Lee (junior specialist), Michael Kirmiz (BMCDB graduate student), Catherine Pabalan (undergraduate student), Stephanie Palacio (postdoc), Nick Vierra (postdoc)
NeuroMab-177 Hutchison website
  • Camelia Dumitras (staff research associate), Belvin Gong (associate director), Karl Murray (assistant adjunct professor), James Terry (junior specialist)


NPB 107 Cell Signaling in Health and Disease (Winter)
NPB 110A Foundations: From Molecules to Individuals (Spring)
PHA 400B /NEU 420 Principles of Pharmacology/Introduction to Clinical Neurosciences


1/8/2018 11:23:54 AM
  • Riquelme, D., Silva, I., Philp, A. M., Huidobro-Toro, J. P., Cerda, O., Trimmer J. S., and E. Leiva-Salcedo. Subcellular localization and activity of TRPM4 in medial prefrontal cortex layer 2/3. Front. Cell. Neurosci. (in press).

  • Bishop, H. I., Cobb, M. M., Kirmiz, M., Parajuli, L., Mandikian, D., Philp, A. M., Melnik, M., Kuja-Panula, J., Rauvala, H., Shigemoto, R., Murray, K. D., and J. S. Trimmer. (2018). Kv2 Channels Determine the Expression and Localization of the Associated AMIGO-1 Cell Adhesion Molecule in Adult Brain Neurons. Front. Mol. Neurosci. 11: 1. DOI: 10.3389/fnmol.2018.00001.

  • Jensen, C. S., Watanabe, S., Stas, J. I., Klaphaak, J., Schmitt, N., Olesen, S.-P., Trimmer, J. S., Rasmussen, H. B., and H. Misonou. (2017). Trafficking of Kv2.1 Channels to the Axon Initial Segment by a Novel Non-Conventional Secretory Pathway. J. Neurosci. 37:11523-11536.

  • Speca, D. J., Trimmer, J. S., Peterson, A. S., and E. Diaz. (2017). Whole Exome Sequencing Reveals a Functional Mutation in the GAIN Domain of the Bai2 Receptor Underlying a Forward Mutagenesis Hyperactivity QTL. Mammalian Genome 28:465-475. 

  • Palacio, S., Chevaleyre, V., Brann, D. H., Murray, K. D., Piskorowski, R. A., and J. S. Trimmer. (2017). Heterogeneity in Kv2 Channel Expression Shapes Action Potential Characteristics and Firing Patterns in CA1 Versus CA2 Hippocampal Pyramidal Neurons eNeuro 4(4). pii: ENEURO.0267-17.2017.

  • Gong, B., Murray, K. D., and J. S. Trimmer. (2016). Developing High-Quality Mouse Monoclonal Antibodies for Neuroscience Research – Approaches, Perspectives and Opportunities. New Biotech. 33: 551-564.

  • Kirk, L. M., Ti, S. W., Bishop, H. I., Llamas-Orozco, M., Pham, M., Trimmer, J. S., and E. Diaz. (2016). Distribution of the SynDIG4/Proline Rich Transmembrane Protein 1 in Rat Brain. J. Comp. Neurol524:2266-2280.

  • Cobb, M. M., Austin, D. C., Sack, J. T., and J. S. Trimmer. (2015). Cell Cycle-Dependent Changes in Localization and Phosphorylation of the Plasma Membrane Kv2.1 K+ Channel Impact Endoplasmic Reticulum Membrane Contact Sites in COS-1 Cells. J. Biol. Chem. 290:29189-29201.

  • Bishop, H. I., Guan, D., Bocksteins, E., Parajuli, L., Murray, K. D., Cobb, M. M., Misonou, H., Zito, K., Foehring, R. C., and J. S. Trimmer. (2015). Distinct Cell- and Layer-Specific Expression Patterns and Independent Regulation of Kv2 Channel Subtypes in Cortical Pyramidal Neurons. J. Neurosci. 35:14922-14942.

  • Thiffault, I., Speca, D. J., Austin, D. C., Cobb, M. M., Eum, K. S., Safina, N. P., Grote, L., Farrow, E. G., Miller, N., Soden, S., Kingsmore, S. F., Trimmer, J. S., Saunders, C. J., and J. T. Sack. (2015) A Novel Epileptic Encephalopathy Mutation in KCNB1 Disrupts Kv2.1 Ion Selectivity, Expression, and Localization. J. Gen. Physiol. 146:399-410.

  • Cerda, O., Leiva-Salcedo, E., Park, K.-S., Cáceres, M., Romeroa, A., Varela, D., Trimmer, J. S., and A. Stutzinband. (2015). Casein Kinase-Mediated Phosphorylation of Serine 839 Is Necessary for Basolateral Localization of the Ca2+-Activated Non-Selective Cation Channel TRPM4. Pflugers Arch. 467: 1723-1732.

  • Jan, L. Y., Attali, B., Nerbonne, J., Sanguinetti, M. C., Trimmer, J. S.,  Chandy, K. G., Grissmer, S., Gutman, G. A., Lazdunski, M., Mckinnon, D., Pardo, L. A., Robertson, G. A., Rudy, B., Stühmer, W., and X. Wang. (2015). Voltage-Gated Potassium Channels. IUPHAR/BPS Guide to PHARMACOLOGY,  http://www.guidetopharmacology.org/GRAC/FamilyDisplayForward?familyId=81.

  • Cáceres, M., Ortiz, L., Romero, A., Recabarren, T., Colombo, A., Leiva-Salcedo, E., Varela, D., Rivas, J., Silva, I., Campusano, C., Almarza, O., Simón, F., Toledo, H., Park, K.-S., Trimmer, J. S., and O. Cerda. (2015). TRPM4 is a Novel Component of the Adhesome Required for Focal Adhesion Disassembly, Migration and Contractility. PLoS ONE 10:e0130540. 

  • Hirono, M., Ogawa, Y., Misono, K., Zollinger, D. R., Trimmer, J. S., Rasband, M. N., and H. Misonou. (2015). BK Channels Localize to the Paranodal Junction and Regulate Action Potentials in Myelinated Axons of Cerebellar Purkinje Cells. J. Neurosci. 35:7082-7094.

  • Trimmer, J. S., and H. Misonou. (2015). Ion Channel Phosphorylation. (Chapter 36, pages 531-544). In The Handbook of Ion Channels. (J. Zheng and M. C. Trudeau, Editors). CRC Press, Boca Raton, FL.

  • Hsiao, J. J., Ng, B. H., Smits, M. M., Wang, J., Jasavala, R. J., Martinez, H. D., Lee, J. A., Alston, J. J., Misonou, H., Trimmer, J. S., and M. E. Wright. (2015). Androgen Receptor and Chemokine Receptors 4 and 7 Form a Signaling Axis to Regulate CXCL12-Dependent Cellular Motility. BMC Cancer 15:204. 

  • Trimmer, J. S. (2015). Subcellular Localization of K+ Channels in Mammalian Brain Neurons: Remarkable Precision in the Midst of Extraordinary Complexity. Neuron 85: 238-256.

  • For a complete list of publications see: http://www.ncbi.nlm.nih.gov/pubmed/?term=trimmer+js