10.1192/bjp.158.1.59Access the most recent version at doi:
1991 158: 59-63 The British Journal of Psychiatry
CB Nemeroff, G Bissette, H Akil and M Fink
Corticotrophin- releasing factor, beta-endorphin and somatostatin
depressed patients treated with electroconvulsive therapy.
Neuropeptide concentrations in the cerebrospinal fluid of
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British Journal of Psychiatry (1991), 158, 59â€”63
In research on the physiological
(CNS) and their putative role in the pathophysiology
of affective disorders and schizophrenia,
factor (CRF), the 41-amino-acid hypothalamic peptide
that regulates the secretion of adrenocorticotrophin
(ACTH) and other pro-opiomelanocortin-derived
peptides of theanterior
CNS, CRF decreases food consumption and sexual
locomotoractivity (Koob & Thatcher-Britton,
In conjunction with the hypercortisolaemia commonly
observed in depressed patients, these findings suggest
that CRF is hypersecretedin depressed patients (Gold
et a!, 1984; Nemeroff,1988). This hypothesis
supported by findings of: elevated CSF concentrations
comparedwith controls (Nemeroff eta!,
et a!, 1987; France et a!, 1988; Arato et a!, 1988); a
blunted ACFH response to intravenously administered
CRF (Gold et a!, 1984; Holsboer et a!, 1984); and
a decreased CRF receptor number in the frontal
cortex of suicide victims (Nemeroff
Somatostatinis a tetradecapeptide
inhibit the secretion of growth hormone
other anterior pituitary hormones. Somatostatin and
free depressed patients (Rubmow eta!, 1983; Bissette
et a!, 1986; Davis et a!, 1988).
While there is no proof that $-endorphin
play a direct role in psychiatric
areknownto be responsive
participatein the expression
role of neuropeptide
nervous in the centralsystem
et a!, 1983), and alters
et a!, 1988a).
are reduced in drug
1986; Berger & Nemeroff, 1987).
We sought to determine whether clinical improve
ment in depressedpatients
vulsive therapy (ECT) is associated
in CSF concentrations of CRF,
(Akil et a!, 1986; Nemeroff& Bissette,
Nine patients (two men, seven women) fulfilling DSMâ€”III
University Hospital, Stony Brook. The 30-bed in-patient
psychiatric unit is part of a large, suburban teaching
hospital complex, which serves as the main tertiary-care
centre for a population of two million. The in-patient service
is a main teaching unit of a psychiatric department, and
the study of new treatments is accepted as a departmental
mission: it is not unusual for more than half the in-patients
to be part of ongoing researchprotocols. In thisenvironment
we have come to know many affectively ill patients with
recurrentillness who view our professionals
psychiatrictherapists.It isfromthiscadrethat thepatients
for the present studies were selected.
The decision to use ECT is made by the treatment team
and is based on the severity of the illness, the patient's
treatment history, tolerance and response to medications
and ECT, and medical status, as well as the wishes of the
patient and the family. The ECT unit is well known, and
the patients see staff members as both research scientists
and clinicians. The ECT consent process follows the
guidelines of the American Psychiatric Association (1978).
Thebenefitsand risksof the treatmentare discussedwith
the patient and close family members, and they viewa
specificresearchfor whichthe patient
The written signedconsent describesthe indications for
ECT,its risks and benefits,the experimental
(miiltifr@ndpiptrnpnrpnhnlnaranhv nnnrnnndncrinn teats
1980) were studied
as their primary
Depressed Patients Treated with Electroconvulsive
Concentrationsin the CerebrospinalFluid of
f3-endorphin and Somatostatin
CHARLES B. NEMEROFF, GARTH BISSETTE, HUDA AKIL and MAX FINK
TheCSFconcentrationsof CRF,somatostatin andj3-endorphinweredeterminedin ninepatients
who fulfilled DSMâ€”lll criteria for major depressionwith psychotic features. CSFsampleswere
obtained at baseline in the depressed state, and again after a course of ECT.Concentrations
of both CRFand @5-endorphin decreased after ECT, while the concentration of somatostatin
increased, although the latter difference did not attain statistical significance. The increase
in CSF concentrations of CRF and @9-endorphin in depressed patients is therefore seen to be
60NEMEROFF ET AL
CSF measures, neuropsychologicaltests), and detailed
statements of the patient's
obtainedfrom both patientand close family members.
For thesestudies,consentwas obtained for two CSF
samples, one before treatment, and one when the patient
had improved. The consent process, both for ECT and for
the various experimental studies, was approved by the
InstitutionalReview Boards of the Health Sciences Center
and University Hospital, and by the University Committee
on Research in Human subjects.
Once consent was obtained,
were done. These included medical, neurological, dental,
and anaesthesia assessments; and complete blood count,
The dexamethasone suppression
performed about four days after admission in all patients
admitted to our unit, and repeated in the four days before
the first ECT if there has been an intervening period longer
than on@week. Cortisol concentrations in plasma were
measured from blood samples obtained at 8.00 a.m., 4.00
p.m., and 11.00 p.m. on the day after dexamethasone
administration(1 mg at 11.00p.m.).
commercial kits obtained from Diagnostic Laboratories Inc.
Based on our experience with patients at University
Hospital, we selected a cut-off point of 5.5 @g/d1 as the
upper limit for â€˜¿?normal'values in the post-dexamethasone
assays,becausethis placed 90Â°!. of
patients in the normal DST group (Fink et a!, 1987).
The Hamilton Rating Scale for Depression (HRSD;
Hamilton, 1967) was completed at the time of the DST.
Diagnoses were based on DSMâ€”IIIcriteria and the
patients were classified as major
(296.34or 236.54).All psychoactive
tapered on admission or when ECT was being considered.
Medications had generally been suspended for four days
at the time of first ECT. Benzodiazepines are routinely
suspended on admission for affectively illpatients, so that
the patients were free of such drugs for at least a week
before treatment began. Assessments of mood, behaviour,
weekly throughout the course of treatment, on a day
The CSF was obtained by lumbar puncture, with patients
and 7.30 a.m. with patient activity limited to toiletting. A
22-gaugeneedlewasused and all sampleswereobtained
by MF. Approximately 15ml of CSF was obtained, and
aliquots from the second and third tubes (6â€”15 ml) were
used in the analyses. The first CSF sample was obtained
from one to four days before the first ECT treatment.
Repeat CSF examinations weredone one (sixpatients), two,
three, and four days (one patient each) after an ECT
treatment.The timeof sampling
change in mood and behaviour, and the second sample was
obtained after ECT sessions6and 10(7 patients), 12and
14(one patient each). After the second CSF sampling, four
patients had no further ECT; two patients had one, two
patients three, and one patient five additional treatments.
right to refuse tests or to
at any time.Consent is
the pre-treatment tests
test (DST) is usually
Theseweredeterminedbythepatient's degreeof improvement
and our estimate of the need for continuing treatment to
maintainit. Thus the meannumber
8.4 (s.d. 0.95, range 6â€”14).
Patients received modified ECT with glycopyrrolate
(0.2 mg),methohexital(0.5 mg/kg),
(0.5 mg/kg), and assisted ventilation with oxygen; electro
cardiogram,blood pressure,and blood oxygen saturation
werecontinuously monitored. Seizureduration ismonitored
by cuff and EEG methods (Gujavarty et a!, 1987).Seizures
areconsideredadequatewhen the duration by cuff monitoring
was25secondsor longer, and the EEG duration at least
equal (Fink & Johnson, 1982).Treatments were begun with
placementif the response was not considered
six or seven treatments(Abrams
currents (either MECTAModel
used with intensitiesselected as slightly above threshold.
Treatments were given three times weekly.
$-endorphin were measured
radioimmunoassay procedures. The concentration of CRF
was measured, as previously described in detail (Nemeroff
et a!, 1984; Chappell et a!, 1986; Banki et a!, 1987)
using an antiserum to ovine CRF generously provided by
Dr WylieVale(SalkInstitute, LaJolla, CA).Themethod
has a sensitivity of 2.5 pg/tube, an IC@(mid-point) of
40 pg. and does not cross-react
endogenous peptides. The concentration of somatostatin
was measured as described in detail by Bissette et a! (1986)
using an antiserum also provided by Vale; it has a sensitivity
of 2.5 pg/tube,an lCn of 100pg, and shows cross
reactivity only with somatostatin
Concentrationsof @-endorphinwere determined by a
previously well characterised
a!, 1983)which recognises j3-endorphinand fl-lipotrophin
equimolarly.CSF (1.2 ml total) was extracted using Sep Pak
cartridges as detailed in Cahill et al(l983). The eluate was
dried down and resuspended in a radioimmunoassay buffer,
allowing the equivalent of 0.6 ml of CSF to be added to
each assay tube. Each sample was assayed in duplicate.
Artificial CSFwas usedto verify
insensitive to salts in the CSF. The midpoint of the assay
is 15â€”20 fmol/tube or the equivalent of 50â€”70 pg of (3-
endorphin/tube. It can reliably detect 3â€”5 pg/tube of (3-
endorphinor its molar equivalent in (3-lipotrophin.
be noted that there is very little j3-lipotrophin-sized
immunoreactivity in mammalian brain or in CSF, and the
values read represent over 90Â°lo (3-endorphin-sizedmaterial.
Statistically significant differences were sought between
CSF peptide concentrationsat baseline and after ECT using
a paired Student's i-test.
of ECTsessions was
& Fink, 1984). Brief-pulse
D or Thymatron)were
The HRSD scores and the post-dexamethasone
cortisolconcentrations for each
scorefor the nine depressedpatients
nine patients studied, eight were DST non-suppressors.
patients of the depressed
was 25.1 (2.6).Of the
includethe DST, the blunted
response to intravenously administered thyrotrophin
response to intravenously
concentrations of monoamine metabolites (Asberg
et a!, 1976; Loosen & Prange,
1981; Gold et a!, 1984;Holsboer et a!, 1984;Reynolds
& Shipley,1985; Doyleeta!,1985; Langer eta!,1986;
Nemeroff et a!, 1988b). Whether these biochemical
or are state-dependent
resolvingthis issue is the confounding
may be unrelated to their therapeutic actions. The
study of changes induced by ECT is an ideal paradigm
for determining whether one or another putative
marker, reflecting a patient's
is ideal because of its documented
because there are no confounding pharmacological
effects of drugs (Fink,
It is important
studying in the present report is not the acute effects
of ECT on CSF neuropeptide
first CSF sample was obtained before any ECT. The
second was obtained at least 24 hours after the last
ECT session. The changes observed are thought to
be associated with the changes in behaviour induced
by the treatment, and not an immediate post-seizure
effect. A parallel is seen in studies of plasma
prolactinafter seizures. There is an immediate
seizure, and a return
With successive treatments,
prolactin is obtunded, but the baseline level remains
the same when measured 24 hours after a seizure.
The alterations in CSF measures were in expected
evidenced by increased CSF concentrations.
improvementwith ECT is associated with reductions
in CRF and $-endorphin
believe that the concentrations
NEUROPEPTIDE CONCENTRATIONS IN CSF BEFORE AND AFTER ECT
in CSF somatostatin levels after treatment.
Five of eight patients exhibitedan increase
(TRH), the blunted
1980; Carroll et a!,
alterations represent trait markers
is unclear. An impediment to
is a trait marker,
or conversely is a state
to emphasise that what we are
with a peak 20â€”30minutes
in two to four hours.
patients,of CRF as
of these two peptides
in CSF. We
Depressionratings and post-DSTcortisol concentrations
The CSF neuropeptide data, expressed as pg/ml, are
presented in Fig. 1.The mean (s.c.m.) CSF concentration
of CRFin thedepressedpatients
(8.8) pg/mI. This concentration isclearlyelevatedcompared
with normal controls studied in our previous investigations,
who had groupmean CSF CRF concentrations
40-60 pg/nil. After a course of ECT, there was a reduction
in mean CSF CRF concentrations
Six of nine patients exhibited a reduction in CSF CRF
concentrations after ECT.
corticotrophin-releasing factor (CRF), @-endorphin and somatostatin
before (0)and after (@)a course of ECT. There was a
significant reduction in the CSF concentrations of CRF (P<0.025)
and fi endorphin (P<0.05).
CSF concentrations(pg/mI)(errorbars show s.c.m.)of
Similar results were obtained with (3-endorphin (Fig. 1).
Pre-treatmentCSF (3-endorphin concentrations
(s.c.m.)) in the depressed patients was 39.9 (5.8) pg/mI.
After ECT, CSF (3-endorphin concentrations were reduced
to 21.5 (8.7) pg/mI (P<0.05). Of the eight patients studied
(one sample was lost for (3-endorphinmeasurement), seven
patients exhibited a fall in CSF (3-endorphinconcentrations
The CSF somatostatin concentrations before and after
ECT exhibited a different pattern to that of CRF and
(3-endorphin (Fig. 1). After ECT there was a small,
Several groups have reported that depressed patients
have low CSF concentrations of this tetradecapeptide
(Rubinow et a!, 1983; Bissette et a!, 1986; Davis
et a!, 1988). After ECT,
insignificant increase in somatostatin
in CSF. Of particular interest,
that the CSF somatostatin
show a patternsimilarto CRF and (3-endorphin,
rendering specificity to the findings observed.
Is the covariation between CRF and (3-endorphin
in the CSF due to a common regulator which controls
both peptides, is it caused by a direct interaction
between these two substances, or is it simply the
reflection of unrelated consequences of ECT? Basic
studies have begun to shed light on this issue. Both
neuropeptidesystems are intimately
responsiveness to stress, not only at an endocrine
level, but also within the brain. In addition, results
on the relase of fi-endorphin from hypothalamic
slices show that CRF is a potent
13-endorphin(Young et a!, 1989). Thus,
elevation of CRF in depressed subjects may be
endorphin release. Conversely, ECT treatment may
lower j3-endorphin levels through
mechanisms, including the decrease in CRF being
liberated. It is likelythat numerous other neurotrans
mitters would participate
Do the changes in CSF peptides represent a non
specific stress response or a differential response of
different tissues to the stimulus or the seizure? While
many authors have argued that the release of peptides
into CSF and blood is non-specific,
Deakin eta! (1983), Whalley eta! (1982) and others,
cited by Fink (1987), argue for a differential
response. The findings in the present study support
the view that the release of peptides following
induced seizures is a specific tissue response.
Do these observations contribute to our understand
ing of the therapeutic chain in ECT? There are two
prevailing hypothesesof the antidepressant
of ECT (Fink,1979, 1984). The neurohumoral
receptor hypothesis accepts the changes reported by
pharmacologistsas the basis for the antidepressant
efficacy of antidepressant drugs as the same for the
ECT process; that is, the increase in uptake and in
receptor activity following induced seizures reversing
a reduction in neurohumoral activity seen as the basis
for the altered mood (Grahame-Smith et a!, 1978;
An alternative view argues that altered mood states
are associated with a change in brain peptide levels,
findings are also of interest.
there was a small but
is the fact
in this modulation.
and that ECT alters these by direct stimulation
of brain cells and by altering acetylcholine and
enhance specific brain tissue responses (Fink, 1979;
Fink & Ottosson, 1980). The present observations
find differential effects of seizures on three brain
peptides, and encourage
peptides to identify those which may directly affect
mood and behaviour.
further study of brain
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Department of Psychiatry, Duke University Medica! Center, Durham, North Carolina 27710; Huda Akil,
PhD, Menta!HeafthResearchInstitute, Department
Medicine, Ann Arbor, Michigan 48109; Max Fink, MD, Department of Psychiatry, State University of
New York at Stony Brook, Stony Brook, New York 11780, USA
B. Nemeroff,MD, PhD, Departmentof Psychiatryand Pharmacology;GarthBissette,PhD,
of Psychiatry,Universityof Michigan Schoo!of
Correspondence:Box3859,Duke UniversityMedicalCenter, Durham, NC 27710, USA