Robert Verkerk

5.6k citations

68 papers · 4.5k indexed · 1 hit paper · h-index 35

Impact in

Biological Psychiatry top 0.05%
- Tryptophan and brain disorders
Behavioral Neuroscience top 0.2%
- Stress Responses and Cortisol

Papers in

Biological Psychiatry 31
- Tryptophan and brain disorders 31
Behavioral Neuroscience 18
- Stress Responses and Cortisol 18

Co-authors: Michaël Maes Simon Scharpé Aye-Mu Myint B. E. Leonard Marta Kubera Brian E. Leonard Harry Steinbusch Yong Ku Kim
Journals: Clinical Chemistry (4 papers)Journal of Molecular Neuroscience (3 papers)Journal of Affective Disorders (3 papers)Neuropsychobiology (3 papers)Neurochemical Research (2 papers)
Partner nations: Belgium Netherlands United States

In The Last Decade

Robert Verkerk

67 papers receiving 4.3k citations

Hit Papers

align trajectories log scale

The new ‘5-HT’ hypothesis of depression: Cell-mediated immune activation induces indoleamine 2,3-dioxygenase, which leads to lower plasma tryptophan and an increased synthesis of detrimental tryptophan catabolites (TRYCATs), both of which contribute to the onset of depression 2010 · 553 citations

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if any of the following hold:

it has ≥500 total citations;
it reaches ≥1.5× the top-1% citation threshold for papers in the same subfield and year (the threshold is the minimum needed to enter the top 1%, not the average within it);
it reaches the top citation threshold in at least one of its specific research topics.

2010 Progress in Neuro-Psychopharmacology and Biological Psychiatry

Peers

Countries citing papers authored by Robert Verkerk

Since Specialization

Citations

This map shows the geographic impact of Robert Verkerk's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Robert Verkerk with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Robert Verkerk more than expected).

Fields of papers citing papers by Robert Verkerk

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Robert Verkerk. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Robert Verkerk. The network helps show where Robert Verkerk may publish in the future.

Co-authorship network

The 25 scholars most cited alongside Robert Verkerk, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Robert Verkerk Line = papers co-authored together Robert Verkerk links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

#	Work
1	The tryptophan catabolite or kynurenine pathway in schizophrenia: meta-analysis reveals dissociations between central, serum, and plasma compartments Molecular Psychiatry ·Abbas F. Almulla, Asara Vasupanrajit, Chavit Tunvirachaisakul, Hussein Kadhem Al‐Hakeim, Marco Solmi, Robert Verkerk, Michaël Maes	2022	55
2	Tracking TRYCAT: A Critical Appraisal of Kynurenine Pathway Quantifications in Blood Frontiers in Pharmacology ·Violette Coppens, Robert Verkerk, Manuel Morrens	2022	4
3	Brain Versus Blood: A Systematic Review on the Concordance Between Peripheral and Central Kynurenine Pathway Measures in Psychiatric Disorders Frontiers in Immunology ·Купцов Владимир Алексеевич, Livia De Picker, Robert Verkerk, Violette Coppens, Marion Leboyer, Norbert Müller, Manuel Morrens	2021	64
4	Scientific rationale for integrative and personalised strategies for pancreatic ductal adenocarcinoma management Integrative Molecular Medicine ·Peyda Korhan, Robert Verkerk, William R. Critchley	2017	7
5	Acute Ischemic Stroke Severity, Progression, and Outcome Relate to Changes in Dipeptidyl Peptidase IV and Fibroblast Activation Protein Activity Translational Stroke Research ·Lesley Baerts, Raf Brouns, 利雄野網, Robert Verkerk, Sebastiaan Engelborghs, Peter Paul De Deyn, Dirk Hendriks, Ingrid De Meester	2016	19
6	Serum Phenylalanine, Tyrosine, and their Ratio in Acute Ischemic Stroke: on the Trail of a Biomarker? Journal of Molecular Neuroscience ·Heidi Ormstad, Robert Verkerk, Leiv Sandvik	2015	28
7	Prolyl Carboxypeptidase Activity Decline Correlates with Severity and Short-Term Outcome in Acute Ischemic Stroke Neurochemical Research ·利雄野網, Raf Brouns, Robert Verkerk, Sebastiaan Engelborghs, Peter Paul De Deyn, Dirk Hendriks, Ingrid De Meester	2014	10
8	Reversal of imbalance between kynurenic acid and 3-hydroxykynurenine by antipsychotics in medication-naïve and medication-free schizophrenic patients Brain Behavior and Immunity ·Aye-Mu Myint, Markus Schwarz, Robert Verkerk, Marília Alves de Lima, J. Zach, Simon Scharpé, Harry W.M. Steinbusch, B. E. Leonard, S.Y. Yao	2011	86
9	Can the Failing Western Medical Paradigm Be Shifted Using the Principle of Sustainability Robert Verkerk	2009	4
10	The decrease in procarboxypeptidase U (TAFI) concentration in acute ischemic stroke correlates with stroke severity, evolution and outcome Journal of Thrombosis and Haemostasis ·Raf Brouns, Evelien Heylen, Johan Willemse, Rishi Sheorajpanday, Didier De Surgeloose, Robert Verkerk, Peter Paul De Deyn, Dirk Hendriks	2009	34
11	Plasma Activity of Prolyl Endopeptidase in Relation to Psychopathology During Immunotherapy with IFN- α in Patients with Renal Cell Carcinoma Journal of Interferon & Cytokine Research ·Arthur R. Van Gool, Robert Verkerk, Durk Fekkes, Stefan Sleijfer, M. Bannink, Wim H.J. Kruit, Bronno van der Holt, Simon Scharpé, Alexander M.M. Eggermont, G. Stoter, M. W. Hengeveld	2008	4
12	Serotonergic disturbances in autistic disorder: L-5-hydroxytryptophan administration to autistic youngsters increases the blood concentrations of serotonin in patients but not in controls Life Sciences ·Jan Croonenberghs, Robert Verkerk, Simon Scharpé, Dirk Deboutte, Michaël Maes	2005	42
13	Serum Activity of Prolyl Endopeptidase, but Not of Dipeptidyl Peptidase IV, Is Decreased by Immunotherapy with IFN- α in High-Risk Melanoma Patients Journal of Interferon & Cytokine Research ·Arthur R. Van Gool, Heidi H. van Ojik, Wim H.J. Kruit, Paul Mulder, Durk Fekkes, M. Bannink, Simon Scharpé, G. Stoter, A.M.M. Eggermont, Michaël Maes, Robert Verkerk	2004	8
14	IDO and interferon-α-induced depressive symptoms: a shift in hypothesis from tryptophan depletion to neurotoxicity Molecular Psychiatry ·Marieke Wichers, Ger H. Koek, Geert Robaeys, Robert Verkerk, Simon Scharpé, Michaël Maes	2004	378
15	Effects of pregnancy and delivery on the availability of plasma tryptophan to the brain: relationships to delivery-induced immune activation and early post-partum anxiety and depression Psychological Medicine ·Michaël Maes, Willem Ombelet, Robert Verkerk, E. Bosmans, Simon Scharpé	2001	60
16	The inflammatory response system and the availability of plasma tryptophan in patients with primary sleep disorders and major depression Journal of Affective Disorders ·Cai Song, Aihua Lin, Stefania Bonaccorso, D Wadatau, Robert Verkerk, Günter Kenis, Eugène Bosmans, Simon Scharpé, Alex Whelan, Paul Cosyns, Raf De Jongh, Michaël Maes	1998	200
17	Serotonin-immune interactions in detoxified chronic alcoholic patients without apparent liver disease: activation of the inflammatory response system and lower plasma total tryptophan Psychiatry Research ·Michaël Maes, Aihua Lin, Eugène Bosmans, Eric Vandoolaeghe, Yasfa Aulia Ernawati, Günter Kenis, Raf De Jongh, Robert Verkerk, Cai Song, Simon Scharpé, Hugo Neels	1998	16
18	Biochemical, metabolic and immune correlates of seasonal variation in violent suicide: a chronoepidemiologic study European Psychiatry ·Michaël Maes, Simon Scharpé, Peter D'Hondt, Dieter Peeters, Annick Wauters, Hugo Neels, Robert Verkerk	1996	50
19	Urinary Excretion of Purine and Pyrimidine Metabolites in the Neonate Pediatric Research ·K. J. Van Acker, François Eyskens, Robert Verkerk, Simon Scharpé	1993	9
20	Disturbances in dexamethasone suppression test and lower availability of Ł-tryptophan and tyrosine in early puerperium and in women under contraceptive therapy Journal of Psychosomatic Research ·Michaël Maes, Madelaine Andersson, Christiaan Schotte, L. Delbeke, Yves Jacquemyn, Robert Verkerk, Ingrid De Meester, Simon Scharpé	1992	39

About Robert Verkerk

Robert Verkerk is a scholar working on Biological Psychiatry, Behavioral Neuroscience, Psychiatry and Mental health, Clinical Biochemistry and Neurology, having authored 68 papers that have together received 4.5k indexed citations. Recurring topics across this work include Tryptophan and brain disorders (31 papers), Stress Responses and Cortisol (18 papers), Bipolar Disorder and Treatment (16 papers), Peptidase Inhibition and Analysis (13 papers), Neuropeptides and Animal Physiology (6 papers), Diabetes Treatment and Management (6 papers), Neuroinflammation and Neurodegeneration Mechanisms (5 papers) and Autism Spectrum Disorder Research (5 papers). The work is most often cited by research in Biological Psychiatry (2.6k citations), Behavioral Neuroscience (1.6k citations), Psychiatry and Mental health (1.2k citations), Neurology (488 citations) and Cellular and Molecular Neuroscience (419 citations). Robert Verkerk has collaborated with scholars based in Belgium, Netherlands and United States. Frequent co-authors include Michaël Maes, Simon Scharpé, Aye-Mu Myint, B. E. Leonard, Marta Kubera, Brian E. Leonard, Harry Steinbusch, Yong Ku Kim, Marieke Wichers and Ger H. Koek. Their work appears in journals such as Clinical Chemistry, Journal of Molecular Neuroscience, Journal of Affective Disorders, Neuropsychobiology and Neurochemical Research.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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