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Minocycline for the Treatment of Early-Phase Schizophrenia

This study has been completed.
Abarbanel Mental Health Center
Information provided by:
Shalvata Mental Health Center Identifier:
First received: August 11, 2008
Last updated: NA
Last verified: August 2008
History: No changes posted
Current antipsychotics have only a limited effect on two core symptoms of schizophrenia, negative symptoms and cognitive deficits. Minocycline is a second-generation tetracycline which has a beneficial effect in various neurological disorders. Recent findings in animal models and human case-reports suggest its potential for the treatment of these symptoms of schizophrenia. The current study aims to examine the efficacy of minocycline as add-on treatment for alleviating negative and cognitive symptoms in early-phase schizophrenia. The study will utilize a longitudinal double blind, randomized, placebo-controlled design with patients followed for six-months. Early-phase schizophrenia patients were recruited and randomly allocated to a minocycline or placebo treatment (2:1 ratio; 200 mg/day). The primary outcome measures are the Scale for Assessment of Negative Symptoms (SANS) and assessments of executive functions.

Condition Intervention Phase
Negative and Cognitive Symptoms in Schizophrenia
Drug: Minocycline
Drug: Placebo (200 mg/day)
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator)
Primary Purpose: Prevention
Official Title: A Double Blind Randomized Study of Minocycline for the Treatment of Negative and Cognitive Symptoms in Early-Phase Schizophrenia

Resource links provided by NLM:

Further study details as provided by Shalvata Mental Health Center:

Primary Outcome Measures:
  • Scale for Assessment of Negative Symptoms (SANS) [ Time Frame: Change in SANS scores over the 6-month study ]

Secondary Outcome Measures:
  • PANSS, CGI, CDS, ITAQ, CANTAB measures, adverse events. [ Time Frame: Change during the 6-month duration of the study ]

Enrollment: 70
Study Start Date: August 2003
Study Completion Date: March 2007
Primary Completion Date: March 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Minocycline treatment
Drug: Minocycline
Minocycline as an add-on drug (200 mg/day)
Placebo Comparator: 2
Drug: Placebo (200 mg/day)

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Detailed Description:

Schizophrenia is a disorder characterized by disturbances in perception, thought, volition, socialization, psychomotor behavior and the sense of self. Although patients suffer from schizophrenia start from a point of relative normalcy or subtle impairment, following formal onset most patients experience, to some degree, clinical deterioration. This deterioration is manifest by the development of and increasing severity and persistence of psychotic and negative symptoms, cognitive impairment, and diminished social and functional capacity. The underlying causes of this clinical deterioration are not known, but is generally attributed to progression of the illness and associated with periods of active positive symptoms. The deterioration occurs primarily in the early stages of the illness and it is generally confined to the first 5 years after onset. It also does not progress in a linear fashion. Rather, after a period, patients stabilize at a level where they have persistent symptoms and are impaired in their social and vocational function. Despite the heterogeneity of symptoms among patients and their variability within patients across episodes, two distinct patterns have been discerned in long-term catamnestic studies of schizophrenia patients. First, negative symptoms tend to be less common and severe in the early stages of the illness and to increase in prevalence and severity in the later stages. In the early stages positive symptoms are more likely to dominate the clinical picture. Second, within the constellation of positive symptoms, formed or systematized delusions and hallucinations are more common in the earlier stages of illness, whereas thought disorganization, inappropriate affect, and motor symptoms are more common in the later stages of illness.

Both MRI and MRS offer evidence, which is consistent with a neurodegenerative pathologic process in schizophrenia that occurs primarily but not exclusively in the early stage of the illness. Recent MRI studies of first-episode and childhood-onset schizophrenia samples using more rigorous and standardized methods have found cortical gray matter and ventricular system volume changes. The findings of volume reductions in cortical gray matter and increases in ventricular system volume can be described as consistent with a process causing pathomorphologic progression and neurodegeneration Investigators have considered the role of molecular mechanisms in the neuropathology of schizophrenia. In this context, proponents of neurodegenerative theories have suggested that the absence of gliosis and evidence of cell degeneration could be due to the fact that the pathophysiology involves a graded apoptosis rather than a fulminant necrotic process. Apoptosis is evanescent and difficult to detect histopathologically before or after the process unfolds. Studies have shown that various neurochemical events at the synapse can induce apoptosis. Such triggering actions include excessive glutamate stimulation, calcium influx reactive oxygen species all of that can induce caspase activation in dendrites. Local activation of caspases that initiate the apoptotic cascade can spread to the cell body or remain localized producing neurodegenerative synapse loss and synaptic remodeling. The reduced size and increased density of neurons, in the absence of decreased numbers of neurons or glia and decreased cortical thickness, indicate that cell processes and synaptic connections are reduced in schizophrenia. This is consistent with reports of decreased concentrations of synaptic proteins (e.g., synaptophysin). These cell processes and synapses could be lost as a consequence of a neurochemically mediated (through dopamine and/or glutamate) synaptic apoptosis that would compromise cell function and alter brain morphology without, however, producing serious cell injury (and thus inducing glial reactions).

Although some authors have suggested that pharmacologic treatment suppresses the symptoms of schizophrenia but does not alter the course of the illness or its potential progression, others have suggested that antipsychotic drugs in fact ameliorate the pathophysiologic process that causes psychotic symptoms and leads to clinical deterioration. Moreover, maintenance treatment studies have demonstrated the prophylactic effect of antipsychotic drugs in preventing relapse; treatment, then, may be responsible for mitigating the course of the illness and producing more favorable outcomes.

Three lines of evidence suggest that the novel neurotransmitter Nitric Oxide (NO) play a central role in pathophysiology of schizophrenia. First, schizophrenia-like syndromes can be induced in humans by phencyclidine (PCP), a drug with marked psychomimetic properties. Recent studies indicate that the behavioral and biochemical effects of PCP in rats are blocked by Nitric Oxid synthase (NOS) inhibitors, suggesting that NO plays an important role in the pharmacological effects of PCP. Second, Postmortem brain tissue obtained at autopsy from schizophrenia and control demonstrate increased in NOS in the cerebellum and brainstem of schizophrenic patients. Third, NO play a role in learning and memory, which severly impaired in schizophrenia.

Minocycline is a second-generation tetracycline used in humans, which effectively crosses the blood-brain barrier. Minocycline is commonly used by humans, because of its beneficial ant-imicrobial and anti-inflammatory properties. In addition, it has remarkable neuroprotective qualities in animal models of cerebral ischemia, traumatic brain injury, and Huntington's and Parkinson's disease. The neuroprotective effect of Minocycline is associated with marked inhibition of inducible NO synthase (iNOS), caspase 1 and caspase 3 expression, and p38 mitogen activated protein kinase (MAPK). Recently, it was found that Minocycline also inhibits cytochrome c release and delays progression of amyotrophic lateral sclerosis in mice.

Because Minocycline may inhibit members of the caspase family, the MAP kinase pathway and NOS (which play central role in the neuroprotective effects of Minocycline in different model of brain-disease), we would like to test the neuroprotective effect of Minocycline in the early development (i.e.- at the first psychotic episode) of schizophrenia. The safety record of Minocycline and its ability to penetrate the blood-brain barrier are well known. Therefore, if this drug will be found to have neuroprotective effect in schizophrenia it may be a novel therapy.


Ages Eligible for Study:   18 Years to 35 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. age between 18-35 years;
  2. current DSM-IV diagnosis of schizophrenia confirmed by the Structured Clinical Interview for DSM-IV (SCID) conducted by a trained psychiatrist.
  3. being at an early phase of the disorder (i.e., within five years of their first exposure to neuroleptic treatment;18)
  4. did not receive antipsychotic treatment for six months preceding current symptom exacerbation;
  5. baseline total score of more than 60 on the Positive and Negative Syndrome Scale (PANSS).
  6. Initiation of treatment with atypical antipsychotic medication equal or less than 14 days prior to study entry (risperidone, olanzapine, quetiapine, or clozapine; 200-600 mg/day chlorpromazine equivalent doses);
  7. able to comprehend the procedure and aims of the study.

Exclusion Criteria:

  1. acute, unstable, significant or untreated medical illness beside schizophrenia;
  2. pregnant or breast-feeding females;
  3. A DSM-IV diagnosis of substance abuse or dependency;
  4. Known contraindication to minocycline treatment.
  5. Treatment with minocycline or Beta-lactam antibiotics in the preceding half year before study entry.
  6. Under compulsory hospitalization.
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Please refer to this study by its identifier: NCT00733057

The Emotion-Cognition Research Center, The Shalvata Mental Health Care Center, P.O.B. 94.
Hod-Hasharon, Israel, 70300
Sponsors and Collaborators
Shalvata Mental Health Center
Abarbanel Mental Health Center
Principal Investigator: Yechiel - Levkovitz, M.D. PhD. Shalvata Mental Health Center
  More Information

Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Dr. Yechiel Levkovitz, M.D., Shalvata Mental Health Center Identifier: NCT00733057     History of Changes
Other Study ID Numbers: SMRI-GRANT-02T-244
Study First Received: August 11, 2008
Last Updated: August 11, 2008

Keywords provided by Shalvata Mental Health Center:
Negative symptoms

Additional relevant MeSH terms:
Neurobehavioral Manifestations
Schizophrenia Spectrum and Other Psychotic Disorders
Mental Disorders
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms
Anti-Bacterial Agents
Anti-Infective Agents processed this record on April 25, 2017