Biochemistry and Molecular Biology
Penn State Science
You are here: Home Directory Bernhard Lüscher
Bernhard Lüscher

Bernhard Lüscher

Main Content

  • Professor of Biology
  • Professor of Biochemistry and Molecular Biology
209 Life Sciences Building
University Park, PA 16802
Email: bxl25@psu.edu
Phone: (814) 865-5549

Research Interests

Molecular and cellular mechanisms underlying neuropsychiatric disorders.

Mechanisms underlying successful antidepressant drug therapies 

Graduate Programs

BIOL, BMMB, MCIBS, NEURSMD/PhD

 

Research Summary

We are working to improve our understanding of the role and function of GABAergic transmission in health and disease. GABA (gamma-aminobutyric acid) is the principal inhibitory neurotransmitter in the brain and known to exert most of its function by activation of so-called GABA(A) receptors. These receptors are GABA-gated chloride channels and they serve as the targets of several classes of clinically and therapeutically important psychoactive drugs, most notably the benzodiazepines (Valium, Xanax, Versed, etc). Based on knowledge derived from these drugs, GABA(A) receptors are known to modulate virtually every higher-order brain function (learning, memory, cognition, emotion, pain, motivation, muscle tension, etc).

A first line of research uses mouse genetics to model and investigate the molecular mechanisms underlying neuropsychiatric disorders. In particular, we are interested in the etiology of Major Depressive Disorder (MDD), a leading cause of total disability affecting about 17 percent of the human population at least once in their lives. Recent clinical evidence points to functional impairment of certain GABA-releasing interneurons and reduced brain concentrations of GABA as a likely cause of MDD. Using targeted mutagenesis in mice, we have shown that modest deficits in GABAergic transmission are sufficient to reproduce behavioral, cognitive, cellular, endocrine, and pharmacological alterations expected of a mouse model of depression. These mice, therefore, provide strong evidence that GABA deficits are not just an epiphenomenon of MDD, but that they can, in fact, be causal for MDD (reviewed in Luscher et al 2011, Mol. Psychiatry). Using these mice we have shown that defects in GABergic transmission can be causal for defects in the function of glutamate, the primary excitatory neurotransmitter in the brain, and that the defects in both GABA and glutamate can be reversed with the rapid-acting antidepressant, ketamine (Ren et al 2016)  

As part of a second line of research, we are elucidating the mechanisms of antidepressant drug action. It is becoming increasingly clear that antidepressants act to ultimately increase and normalize GABAergic synaptic transmission even if they are designed to enhance the function of other neurotransmitters (serotonin, norepinephrine, glutamate, and their receptors. Therefore, we asked whether genetically enhancing the function of certain GABA-releasing interneurons would be sufficient to mimic the effects of above antidepressant drug treatments. We succeeded in showing that genetically increasing the excitability of GABA-producing interneurons known as somatostatin cells reproduced both biochemical and behavioral consequences of antidepressant drug treatment (Fuchs et al 2017). 

Ongoing research seeks to better understand the molecular and cellular changes underlying MDD and antidepressant drug action, with the aim to design novel antidepressant drug treatments.

Selected Publications

Du K., S. Murakami, Y. Sun, C. Kilpatrick and B. Luscher (2017). DHHC7 palmitoylates Glut4 and regulates Glut4 membrane translocation.  J. Biol. Chem. 292, 2979-2991  Recommended by F1000.

Kilpatrick C. L., Murakami, S., Feng, M., Wu, X., Lal, R., Chen, G., Du, K., Luscher, B. (2016) Dissociation of Golgi-associated DHHC-type zinc finger protein (GODZ) and sertoli cell gene with a zinc finger domain-β (SERZ-β)-mediated palmitoylation by loss of function analyses in knockout mice.  J. Biol. Chem. 291, 27371-27386

Fuchs T,  Jefferson SJ, Hooper H, Yee P-HP, Maguire J, and Luscher B. (2016). Disinhibition of somatostatin-positive GABAergic interneurons results in an anxiolytic and antidepressant-like brain state. Molecular Psychiatry, Epub online.  Commentary by Zhang et al Mol Psych.  Recommended by F1000.

Ren Z, Pribiag H, Jefferson SJ, Shorey M, Fuchs T, Stellwagen D, and Luscher B (2016): Bidirectional homeostatic regulation of a depression-related brain state by GABAergic deficits and ketamine treatment. Biol Psychiatry, 80, 457–468.    Commentary by JW Murrough.

Ren, Z., Sahir, N., Murakami, S., Luellen, B.A., Earnheart, J.C., Lal, R., Kim, J.Y., Song, H., and Luscher B. (2015). Defects in dendrite and spine maturation and synaptogenesis associated with an anxious-depressive-like phenotype of GABAA receptor-deficient mice. Neuropharmacology 88, 171-179.

Luscher B, Fuchs T (2015). GABAergic control of depression-related brain states, In Diversity and function of GABA receptors: A tribute to Hanns Möhler, Part B. Advances in Pharmacology 73, 97-144.  Recommended by F1000.

Dejanovic, B., Semtner, M., Ebert, S., Lamkemeyer, T., Neuser, F., Luscher, B., Meier, J.C., and Schwarz, G. (2014). Palmitoylation of gephyrin controls receptor clustering and plasticity of GABAergic synapses. PLoS Biol.12, e1001908.

Shen, Q., T. Fuchs, N. Sahir, and B. Luscher. 2012. GABAergic control of critical developmental periods for anxiety- and depression-related behavior in mice. PLoS One, 7 (10), e47441

Song, J, C. Zhong, M. Bonaguidi, D. Hsu, H. Davoudi, Y. Gu, K. Meletis, S. Ge, G. Enikolopov, K. Deisseroth. B. Luscher, K. Christian, G.-l. Ming and H. Song. 2012. Neuronal circuitry mechanism regulating adult quiescent neural stem cell fate decision. Nature 489, 150-154.

Luscher B., T. Fuchs and C. Kilpatrick. 2011. GABA-A receptor trafficking-mediated plasticity of inhibitory synapses. Neuron 12, 385-409.

Luscher, B., Q. Shen, and N. Sahir. 2011. The GABAergic deficit hypothesis of major depressive disorder. Mol. Psychiatry 15: 383-406.

Shen Q., R. Lal, B. A. Luellen, J. C. Earnheart, A. M. Andrews,  and B. Luscher. 2010. GABA-A receptor deficits cause hypothalamic-pituitary-adrenal axis hyperactivity and antidepressant drug sensitivity characteristic of melancholic depression. Biol. Psychiatry 68: 512-520.

Yuan X., J. Yao, J. S. Qi, D. Norris, D. D. Tran, R. J. Bram, G. Chen, and B. Luscher. 2008. Calcium-Modulating cyclophilin Ligand regulates membrane trafficking of postsynaptic GABA-A receptors. Mol. Cell. Neurosci. 38: 277-289.

Earnheart, J. C., C. Schweizer, F. Crestani, T. Iwasato, S. Itohara, H. Mohler, B. Luscher. 2007. GABAergic control of adult hippocampal neurogenesis in relation to behavior indicative of chronic trait anxiety and depression states. J. Neurosci. 27: 3845.

Fang C., L. Deng, C. A. Keller, M. Fukata, Y. Fukata, G. Chen, and B. Luscher. 2006. GODZ-mediated palmitoylation of GABA-A receptors is required for normal assembly and function of GABAergic inhibitory synapses. J. Neurosci. 26: 12758-12768.

Alldred, M. J., J. Mulder-Rosi, S. E. Lingenfelter, G. Chen, and B. Luscher. 2005. Distinct ?2 subunit domains mediate clustering and synaptic function of postsynaptic GABA-A receptors and gephyrin. J. Neurosci. 25: 594-603.

Crestani F, M. Lorez, K. Baer, C. Essrich, D. Benke, JPLauren, C. Belzung, JM Fritschy, B. Luscher and H. Mohler. 1999. Decreased GABAA-receptor clustering results in enhanced anxiety and a bias for threat cues. Nat. Neurosci. 2, 833-839.

Essrich C, Lorez M, Benson JA, Fritschy JM, B. Luscher. 1998. Postsynaptic clustering of major GABAA receptor subtypes requires the gamma 2 subunit and gephyrin. Nat Neurosci. 1:563-71.

Link to Publications on Research Gate