Background and interests
I have spent most of my career on quantitative analysis of imaging agents used with positron emission tomography (PET), with an emphasis on brain imaging. Tracers I have studied in the past include [18F]6-fluoro-L-DOPA (dopamine synthesis), [11C]carfentanil (mu-opioid receptors), [11C]raclopride (dopamine D2 receptors), [11C]PK11195 (peripheral benzodiazepine receptors - glial activation), and [11C]DASB (serotonin transporters).
My primary research interest is to better extract information from PET and SPECT imaging studies, and to develop methodology to incorporate data from various sources that can supplement imaging data. Currently, I'm involved in projects in small animal imaging, as well as imaging studies in humans and non-human primates. Small animal studies include dynamic whole body quantification of tracer uptake, quantification of FDG uptake, and general tracer validation studies. Human studies include the evaluation of serotonin transporter binding in HIV dementia, and microglial activation in multiple sclerosis and Alzheimer's disease.
Contact information
Phone: 410 502-0939
Email: endres@jhmi.edu
FAX: 410 614-3147
Selected Publications
Y. Zhou, M.K. Chen, C.J. Endres, W. Ye, J.R. Brasic, M. Alexander, A.H. Crabb, T.R. Guilarte, D.F. Wong. An extended simplified reference tissue model for the quantification of dynamic PET with amphetamine challenge. NeuroImage, 550-563, (2006).
D.A. Hammoud, C.J. Endres, A.R. Chander, T.R. Guilarte, D.F. Wong, N.C. Sacktor, J.C. McArthur, M.G. Pomper. Positron Emission Tomography with [11C]-R-PK11195 in HIV-associated Dementia. Neurovirology, 11, 1-10 (2005).
D.A. Gorelick, Y.K. Kim, B. Bencherif, S.J. Boyd, R. Nelson, M. Copersino, C.J. Endres, R.F. Dannals, J.J Frost. Imaging Brain Mu-Opioid Receptors in Abstinent Cocaine Users: Time Course and Relation to Cocaine Craving. Biological Psychiatry, 57, 1573-1582 (2005).
M. Alexander, R.B. Rothman, M.H. Baumann, C.J. Endres, J.R. Brasic, D.F. Wong. Noradrenergic and Dopaminergic Effects of (+)-Amphetamine-Like Stimulants in the Baboon Papio anubis. Synapse, 56, 94-99 (2005).
C.J. Endres, O.T. DeJesus, H. Uno, D. Doudet, R.J. Nickles, J.E. Holden. Time Profile of Cerebral [18f]6-Fluoro-L-Dopa Metabolites in Nonhuman Primate: Implications for the Kinetics of Therapeutic L-Dopa. Frontiers in Bioscience, 9(1), 505-512 (2004).
Y. Zhou, C.J. Endres, J.R. Brasic, S.-C. Huang, D.F. Wong. Linear Regression with Spatial Constraint to Generate Parametric Images of Ligand-receptor Dynamic PET Studies with a Simplified Reference Tissue Model. NeuroImage, 18(4), 975-989 (2003).
C.J. Endres, B. Bencherif, J. Hilton, I. Madar, and J.J. Frost. Quantification of brain mu-opioid receptors with [11C]carfentanil: Reference tissue methods. Nuclear Medicine and Biology, 30(2), 177-186 (2003).
B. Bencherif, C.J. Endres, J.L. Musachio, A.Villalobos, J.Hilton, U. Scheffel, R.F. Dannals, S. Williams, and J.J. Frost. PET imaging of brain acetylcholinesterase using [11C]CP-126,998, a brain selective enzyme inhibitor. Synapse, 45(1), 1-9 (2002).
O.T. DeJesus, C.J. Endres, S.E. Shelton, R.J. Nickles, and J. Holden. Non-invasive assessment of aromatic L-amino acid decarboxylase activity in aging rhesus monkey brain in vivo. Synapse 39(1): 58-63 (2001).
H. Watabe, C.J. Endres, A. Breier, B. Schmall, W.C. Eckelman, R.E. Carson. Measurement of dopamine release with continuous infusion of [C-11]raclopride: optimization and signal-to-noise considerations. J. Nucl. Med. 41:522-530 (2000).
C.J. Endres, and R.E. Carson. Assessment of dynamic neurotransmitter changes with bolus or infusion delivery of neuroreceptor ligands. J. Cereb. Blood Flow Metab. 18:1196-1210 (1998).
D.O. Kiesewetter, R.E. Carson, E.M. Jagoda, C.J. Endres, M.G. Der, P. Herscovitch, and W.C. Eckelman. In Vivo Muscarinic Binding Selectivity Of (R,S) And (R,R)-[18F]Fluoromethyl QNB. Bioorganic Med. Chem. 5(8), 1555-1567 (1997).
J.E. Holden, D. Doudet, C.J. Endres, G.L-Y. Chan, K.S. Morrison, F.J.G. Vingerhoets, B.J. Snow, B.D. Pate, V. Sossi, K.R. Buckley, and T.J. Ruth. Graphical analysis of 6-fluoro-L-DOPA trapping: Effect of inhibition of catechol-O-methyltransferase. J. Nucl. Med. 38:1568-1574 (1997).
C.J. Endres, B.S. Kolachana, R.C. Saunders, T. Su, D. Weinberger, A. Breier, W.C. Eckelman, R.E. Carson. Kinetic modeling of [11C]raclopride: combined PET-microdialysis studies. J. Cereb. Blood Flow Metab. 17:932-942 (1997).
C.J. Endres, S. Swaminathan, O.T. DeJesus, M. Sievert, A. E. Ruoho, D. Murali, S.G. Rommelfanger, and J.E Holden. Affinities of dopamine analogs for monoamine granular and plasma membrane transporters: implications for PET dopamine studies. Life Sci. 60(26) 2399-2406 (1997).
O.T. DeJesus, C.J. Endres, S.E. Shelton, R.J. Nickles, and J.E. Holden. Evaluation of fluorinated m-tyrosine analogs as PET imaging agents for dopamine nerve terminals: Comparison with 6-fluorodopa. J. Nucl. Med. 38:630-636 (1997).
O.T. DeJesus, D. Murali, R. Kitchen, C. Endres, T.R. Oakes, S.E. Shelton, L. Freund, D. Houser, H. Uno, J.E. Holden, and R.J. Nickles. Evaluation of 3-[18F]fluoro a-fluoromethy-p-tyrosine as a tracer for striatal tyrosine hydroxylase activity. Int. J. Appl. Rad. Inst., Part B: Nucl. Med. Biol. 21, 4:663-667 (1994).
O.T. DeJesus, J.E. Holden, C. Endres, D. Murali, T.R. Oakes, S. Shelton, H. Uno, D. Houser, L. Freund, S.B. Perlman, and R.J. Nickles. Visualization of dopamine nerve terminals by positron tomography using [18F]-fluoro-b-fluoromethylene-m-tyrosine. Brain Research 597: 151-154 (1992).
E.D. Morris, R.F. Muzic Jr, B.T. Christian, C.J. Endres, and R.E. Fisher. Modeling of receptor images in PET and SPECT, IN: Functional neuroimaging in child psychiatry. Cambridge University Press 2000.
E.D. Morris, C.J. Endres, K.C. Schmidt, B.T. Christian, R.F. Muzic Jr. and R.E. Fisher (2004): Kinetic Modeling in PET, IN: Emission Tomography. M Wernick and J Aarsvold eds. Academic (2004).
C.J. Endres, A.S. Dogan, J.R. Brasic, Y. Zhou, J. Hilton, E.D. London, D.F. Wong. Comparison between bolus and infusion [11C]raclopride delivery for the quantification of dopamine release associated with craving for cocaine. In: “Brain imaging using PET” (Michio Senda, Yuichi Kimura, and Peter Herscovitch, eds), pp. 71-75. (2002), Academic Press, San Diego.
Y. Zhou, C.J. Endres, A.S. Dogan, J.R. Brasic, S.-C. Huang, D.F. Wong. A new linear parametric imaging algorithm derived from simplified reference tissue model for ligand-receptor dynamic PET studies. In “Brain Imaging Using PET” (Senda M., Kimura Y., and Herscovitch P., eds), pp. 33-39. (2002), San Diego, Academic Press.
Y. Zhou, J.R. Brasic, J.L. Musachio, S.R. Zukin, H. Kuwabara, A.H. Crabb, C.J. Endres, J. Hilton, H. Fan, D.F. Wong. Human [123I]5-I-A-85380 Dynamic SPECT Studies in Normals: Kinetic Analysis and Parametric Imaging, In:Proc of IEEE Nuclear Science Symposium and Medical Imaging, (2002) 1335-1340.
C.J. Endres, and R.E. Carson. Characteristics of neurotransmitter competition studies using constant infusion of tracer. In “Quantitative Functional Brain Imaging with Positron Emission Tomography” pp. 435-439. (1998), Press, San Diego.
Assistant professor of radiology
Johns Hopkins University
1550 Orleans Street
Rm 491, CRB II
Baltimore, MD, 21231