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The Journal of Neuroscience, January 1, 2003, 23(1):297-302
Maternal Influenza Infection Causes Marked Behavioral and
Pharmacological Changes in the Offspring
Limin
Shi1,
S. Hossein
Fatemi2,
Robert W.
Sidwell3, and
Paul H.
Patterson1
1 Biology Division, California Institute of Technology,
Pasadena, California 91125, 2 Department of Psychiatry,
University of Minnesota Medical School, Minneapolis, Minnesota 55455, and 3 Institute for Antiviral Research, Utah State
University, Logan, Utah 84322
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ABSTRACT |
Maternal viral infection is known to increase the risk for
schizophrenia and autism in the offspring. Using this observation in an
animal model, we find that respiratory infection of pregnant mice (both
BALB/c and C57BL/6 strains) with the human influenza virus yields
offspring that display highly abnormal behavioral responses as adults.
As in schizophrenia and autism, these offspring display deficits in
prepulse inhibition (PPI) in the acoustic startle response. Compared
with control mice, the infected mice also display striking responses to
the acute administration of antipsychotic (clozapine and
chlorpromazine) and psychomimetic (ketamine) drugs. Moreover, these
mice are deficient in exploratory behavior in both open-field and
novel-object tests, and they are deficient in social interaction. At
least some of these behavioral changes likely are attributable to the
maternal immune response itself. That is, maternal injection of the
synthetic double-stranded RNA polyinosinic-polycytidylic acid
causes a PPI deficit in the offspring in the absence of virus.
Therefore, maternal viral infection has a profound effect on the
behavior of adult offspring, probably via an effect of the maternal
immune response on the fetus.
Key words:
schizophrenia; autism; mental retardation; prepulse
inhibition; acoustic startle; open field; novel object; clozapine; chlorpromazine; ketamine; poly(I:C)
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Introduction |
In an average year, influenza
infections cause 10,000-20,000 deaths in the United States alone. In
addition, over the last 300 years influenza pandemics have occurred
every 10-20 years (Gust et al., 2001 ). Influenza infection of pregnant
women can lead to complications in pregnancy such as stillbirth and
miscarriage (Shahab and Glezen, 1994). It is important to note that
even less severe maternal infections also can lead to devastating
outcomes. Many epidemiological studies have found a significantly
increased risk for schizophrenia in the offspring of women who were
exposed to influenza during the second trimester of pregnancy. Similar associations have been made for rubella, measles, varicella-zoster, and
diphtheria (Mednick et al., 1988; Brown et al., 2000). In addition,
maternal viral infection has been cited as the "principal non-genetic
cause of autism" (Ciaranello and Ciaranello, 1995). What these
various insults are likely to have in common is a maternal antiviral
response (Patterson, 2002).
To investigate how maternal viral infection may influence fetal brain
development, it would be useful to have a mouse model to enable genetic
manipulation. To help accomplish this, we report an initial study of
the behavior of the offspring of mice that were given a respiratory
infection with a mouse-adapted human influenza virus at mid-pregnancy.
Using the same maternal influenza virus infection paradigm, we
previously found thinning of the neocortex and hippocampus, pyramidal
cell atrophy, reduced levels of Reelin immunoreactivity, changes in the
expression of neuronal nitric oxide synthase (nNOS) and
synaptosome-associated protein of 25 kDa (SNAP-25), and macrocephaly in
the brains of neonatal mice born to infected mothers (Cotter et al.,
1995; Fatemi et al., 1998a,b, 2000, 2002).
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Materials and Methods |
Viral infection. On day 9.5 of pregnancy, BALB/c mice
(Simonson Laboratories, Gilroy, CA) were anesthetized intraperitoneally with 10 mg/kg xylazine and 100 mg/kg ketamine and infused intranasally at the California Institute of Technology (Caltech) with 6 × 103 pfu of the human influenza virus
A/NWS/33CHINI in 90 µl of PBS. Sham-infected mothers were
treated identically but were infused with PBS. C57BL/6 mice (Simonson)
were infected similarly at Utah State University (Fatemi et al., 1999,
2000), and the mothers and offspring were shipped to Caltech for
behavioral analysis, which was performed 4-8 weeks after arrival.
Offspring were separated from their mothers after 3 weeks, and males
and females were caged separately in groups of two to four.
Polyinosinic-polycytidylic acid injection.
Polyinosinic-polycytidylic acid [poly(I:C); Sigma, St. Louis, MO] was
diluted in PBS and injected intraperitoneally in pregnant BALB/c
females at day 9.5 of pregnancy at doses of 20, 10, 5, 2.5, and 0 mg/kg.
Exploratory behavior and anxiety. The apparatus for
the open-field and novel-object tests included a 50-cm-square open
translucent plastic box with 17 cm sides. Twenty-five equal-size
squares were marked on the bottom, and the box was illuminated by
ambient fluorescent ceiling lights. In the open-field test, mice were
placed individually near the center of the box, and their movements
were followed by videotaping over a 10 min period. We quantified the
time spent in the nine center squares, the number of times those
squares were entered, and the number of times mice reared on their
hindpaws. Using the same BALB/c mice (9-10 months old) that were used
for the prepulse inhibition (PPI) assay described below, an observer blind to the history of the mice graded these behaviors.
The novel-object test was performed immediately after the open-field
test without removing the mouse from the box. This was done to
condition the mouse to the open-box paradigm before placing the object
in the box. The object was a round silver cup (4 cm in diameter at the
closed end, 6 cm in diameter at the open end, and 4 cm high), and it
was placed open end down, four squares from wherever the mouse was
located, at the end of the open-field test, and we were careful to
place it in a square immediately adjacent to a square lining the wall
of the box. That is, the object was always in a center square but not
far from the wall. The latency to contact the object and the numbers of
contacts were quantitated in the initial 10 min period.
Spontaneous activity. Locomotor activity was
monitored using a Photobeam Activity System (San Diego Instruments, San
Diego, CA). A translucent cage was placed between photobeams.
Individual mice were moved from their home cage to this cage, and
ambulatory activity was defined as the successive interruption of two
of the four beams crossing the cage for 40 hr.
Sensorimotor coordination. We analyzed mice in a
rota-rod task using a Rota-rod Treadmill (Ugo Basile, Comerio, Italy)
during the light phase of a 12 hr light/dark cycle. When the mice were in position, the timer was set to zero, and the rota-rod was switched from 4 rpm to accelerating mode (increasing 4 rpm every 25 sec). After
training the mice for 1 d, we performed three trials each day for
3 d, recording the longest duration that each mouse stayed on the
rota-rod. These times were averaged for each session for each mouse,
and means were calculated for the control (n = 10) and
exposed (n = 10) groups.
Social behavior. One to 2 d after the open-field
test, using the same open-field box, we examined social interaction
between pairs of mice. We placed two mice (that had been housed
separately) of the same sex and same experimental group in the center
of the box ~10 cm apart and monitored their contact with one another from videotapes of the 5 min test period under normal room lighting. A
positive contact was scored when the nose of one mouse appeared to be
<2 mm away from the other mouse. The time spent in contact included
any type of body contact.
Acoustic startle response. At 6-8 weeks of age,
which represents late adolescence to early adulthood, the offspring
were tested for their acoustic startle responses in a startle chamber
(SR-LAB; San Diego Instruments) using standard methods described
previously (Swerdlow and Geyer, 1998; Koch, 1999). A 5.1-cm-diameter
Plexiglas cylinder mounted on a platform (20.4 × 12.7 × 0.4 cm) with a piezoelectric accelerometer unit attached below was located
in a sound-attenuated chamber with a loudspeaker (24 cm above the
cylinder) and light. The delivery of acoustic stimuli was controlled by
the SR-LAB computer. Sound levels were measured and calibrated with a
Radio Shack (Fort Worth, TX) sound-level meter, and response
sensitivities were calibrated using the SR-LAB Startle Calibration
System. The 17 min test sessions consisted of six trial types: (1)
pulse alone (120 dB), 40 msec broadband burst; pulse preceded 100 msec
by a 20 msec prepulse that was (2) 3 dB, (3) 5 dB, (4) 10 dB, or (5) 15 dB over background; and (6) background (65 dB) only (no stimulus). Test
sessions followed an initial 5 min acclimation period. Our baseline
data on the intensity and stability of the response and habituation to
it are consistent with those determined previously (Swerdlow and Geyer,
1998).
For drug treatments, mice were placed in the startle box for PPI
testing 5 min after intraperitoneal injection.
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Results |
Viral infection
Intranasal infusion of both BALB/c and C57BL/6 mice with 6 × 103 pfu of human influenza virus caused
sickness behavior (lethargy, sleepiness, ruffled fur, and lack
of grooming) for several days, but loss of pregnancy was not common as
long as the mice were not disturbed. A mild (<50%) lung consolidation
occurred in the mothers, with a virus titer in the lungs of
~3-4 × 103 pfu early in the
infection, and the titer dropped thereafter to undetectable levels.
Fever does not occur in mice infected with influenza virus (Sidwell
et al., 1986). For the BALB/c offspring, the birth weights of the
control and experimental mice did not differ significantly (1.50 ± 0.03 vs 1.34 ± 0.09 gm, respectively; p = 0.12; n = 9). However, the litter size was different
(8.25 ± 1.03 vs 4.14 ± 0.26 for sham-infected vs
virus-infected mothers, respectively; p = 0.001;
n = 7).
Exploratory behavior
We used two assays of exploratory behavior with BALB/c mice, the
open-field and novel-object tests (File, 1985; Weiss et al., 2000).
Both of these tests are thought to be relevant for anxiety states in
mental illness. In the open-field assay, the offspring of sham-infected
versus virus-infected mothers are readily distinguished by the time
that they spend in the center squares of the box and by the number of
times that they enter those squares. Examples of the behavior of
typical mice from the two groups are illustrated in Figure
1. Quantitation of the data reveals very
significant differences in both measures of exploratory behavior (Table
1). The mice born to infected mothers
spend nearly eightfold less time in the center squares
(p < 0.0005; two-tailed t test), and most of their time is spent in the corners of the box (Fig. 1). These
mice also enter the center squares nearly sixfold less often (p < 0.0016), and they explore their
environment by rearing on their hindlegs fourfold less often
(p < 0.001) (Table 1). These findings were
replicated in several smaller studies.
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Figure 1.
The exploratory behavior of mice born to infected
mothers is very different from that of mice born to sham-infected
mothers. The movements of a typical mouse from each group were traced
from a videotape of a 10 min session in an open field subdivided into
25 squares by lines on the bottom of the box. Sites of rearing on
hindpaws are illustrated by circles. Although these are
not the most extreme examples of the behavior of mice from each group,
it is clear that the mouse born to a sham-infected mother
(top) responds very differently to the stress of this
situation than the mouse born to a virus-infected mother
(bottom).
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Although the mice born to infected mothers spent most of the 10 min
test period in a corner of the box, they did not exhibit freezing
behavior; they were moving frequently. To quantitate spontaneous
activity in a home-cage environment, we used a photobeam-crossing apparatus. When the mice born to infected mothers initially were placed
in this new home cage, they clearly displayed far less exploratory
movement than the control mice (Fig. 2).
Although the control mice actively explored this novel environment
during both the first day and the first night, the experimental mice failed to do so. By the second night, however, the amount of ambulatory movement was indistinguishable in the two sets of mice. Therefore, the
activity of the mice born to infected mothers does not differ from the
controls once they become familiar with their home-cage environment.
This is consistent with the observation that the experimental mice are
not immobile in the open-field test; rather, they move frequently but
rarely explore the center of the field (Fig. 1).
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Figure 2.
Spontaneous activity assayed by photobeam
crossing. Individual mice were removed from their home cage and placed
in the photobeam apparatus for 40 hr. The number of successive beam
crossings (ambulation) was recorded and is expressed per hour. Control
mice (n = 8; 4 males) explored this new environment
extensively for the first 24 hr period and then settled into a regular
activity pattern on the second day. The mice born to infected mothers
(n = 10; 5 males) failed to display the early,
active exploration pattern seen in the controls, but beginning on the
second night, their baseline activity level was not different from the
controls. *p < 0.05; **p < 0.01.
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The novel-object test was performed immediately after the open-field
test without removing the mouse from the box. Two measures of object
exploration were quantitated. The mice born to infected mothers have an
almost twofold greater latency in first contacting the object
(p < 0.05), and they initiate almost threefold
fewer contacts with the object than mice born to sham-infected mothers (p < 0.003) (Table 1). These results were
replicated in several smaller experiments.
Sensorimotor coordination
To test the mice for general sensorimotor coordination, we used
the rota-rod in the accelerating mode. After an initial training session, the mice were tested three times daily for 3 d. We
averaged the time that each mouse stayed on the bar in each of the
different sessions (tests 1, 2, and 3) over the 3 d; there were no
significant differences between the mice born to virus-infected mothers
and those born to sham-infected mothers (Fig.
3).
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Figure 3.
Exposed and control mice display no differences in
the rota-rod test. Mice were tested three times daily for 3 d on a
rota-rod in the accelerating mode. The results are expressed as the
means of each of the daily test sessions, and we recorded the longest
duration that each mouse stayed on the rota-rod. There was no
significant difference between control (n = 10) and
exposed (n = 10) groups for any of the three
sessions.
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Social behavior
Using the same open-field box, we examined social interactions
between mice that had not seen each other before but were of the same
sex and experimental group. The mice born to infected mothers contacted
each other 2.7-fold less frequently than the mice born to sham-infected
mothers (p < 0.01) (Table
2). There was also a four- to fivefold
difference in latency to first contact, although this did not reach
statistical significance. The large variance in the latter data set
likely is attributable to our placing the mice near one another at the
beginning of the test, which can lead to seemingly random contact in
some cases.
Acoustic startle response
Acoustic startle response has been used effectively in both humans
and rodents to measure sensorimotor gating. Acoustic stimuli are
delivered, and startle responses are measured in an automated apparatus. When a prepulse too small to cause a startle
itselfprecedes the startle stimulus, the response is diminished, a
phenomenon that is termed PPI. In one experiment using the same BALB/c
mice that were tested for exploratory and social behaviors, mice born to sham-infected mothers and mice born to virus-infected mothers were
tested for PPI. The data for PPI of various prepulse intensities are
shown in Figure 4. The offspring of
infected mothers display significant PPI deficits at prepulses of 75 dB
(10 dB higher than background) and 80 dB (15 dB higher than
background). Similar results were obtained with C57BL/6 mice; in one
experiment, 10 mice born to sham-infected mothers and 48 mice born to
virus-infected mothers were tested, and the latter group displayed a
deficit at 80 dB (data not shown).
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Figure 4.
Responses of BALB/c mice in the prepulse
inhibition (PPI) assay. Compared with mice born
to sham-infected mothers (Control)
(n = 14; 8 females), the mice born to infected
mothers (Exposed) (n = 29; 15 females) display reduced PPI. These deficits are most significant at 75 dB, which is 10 dB higher than background (p < 0.05), and at 80 dB, which is 15 dB higher than background
(p < 0.01).
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Pharmacological tests using psychoactive drugs that are known to modify
PPI further emphasize the difference between the two groups of
offspring. Ketamine was used as the psychomimetic agent because its
antagonism with glutamate at the NMDA receptor exacerbates psychotic
symptoms in schizophrenic patients and elicits hallucinations in normal
subjects (Ellison, 1995; Malhotra et al., 1997). As expected from
previous studies on rats (Swerdlow et al., 1998), injection of 6 mg/kg
ketamine caused a decrease in PPI in control BALB/c mice (Fig.
5). In contrast, the mice born to
virus-infected mothers displayed an actual increase in PPI in
response to ketamine. Strikingly similar results were found for C57BL/6
mice (Fig. 5).
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Figure 5.
The effect of ketamine on PPI. The psychomimetic
drug ketamine was administered 5 min before testing the acoustic
startle response. As expected, ketamine diminished the PPI response
(with an 80 dB prepulse) in the BALB/c mice born to sham-infected
mothers (Control) (n = 14; 8 females), but it increased PPI in mice born to virus-infected mothers
(Exposed) (n = 29; 15 females). The
difference in the drug-induced increases between control groups and
experimental groups is significant (p < 0.02). Similar results were observed for C57BL/6 mice
(n = 10 and 48 for control groups and experimental
groups, respectively; p < 0.04).
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The difference between these groups of offspring is highlighted further
by acute administration of dopamine-receptor blockers. Clozapine, a
commonly used, atypical antipsychotic drug is known to increase PPI in
rodents (Swerdlow et al., 1998), and it did so in our control BALB/c
mice in a dose-dependent manner (data not shown). The mice born to
infected mothers, however, displayed a fivefold greater increase in PPI
in response to 2 mg/kg clozapine (Fig.
6). The same results were observed in the
C57BL/6 mice (data not shown). In addition, very similar results were
obtained with both strains of mice using 2 mg/kg chlorpromazine, a
typical antipsychotic drug (Fig. 6). Therefore, the antipsychotic drugs
corrected the PPI deficit in the experimental group, and these mice
displayed a marked hypersensitivity to these drugs.
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Figure 6.
The effect of antipsychotic drugs on PPI. The
typical antipsychotic drug chlorpromazine and the atypical
antipsychotic drug clozapine were acutely administered to BALB/c mice,
and PPI responses (with an 80 dB prepulse) were assayed. As expected
from previous studies with rats, the sham-infected mice
(Control) (n = 10; 5 females)
displayed a modest increase in PPI when tested after drug injection. In
contrast, the mice born to virus-infected mothers
(Exposed) (n = 21; 12 females)
displayed an extremely large increase in PPI after drug administration.
The difference in the drug-induced increases between the control group
and the experimental groups is significant (*p < 0.03). Note that the data are expressed as the percentage of PPI
increase.
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These pharmacological results also indicate that the mice born to
infected mothers do not have an intrinsic auditory deficit, because
they respond more strongly than control mice to the prepulse under
these circumstances. The finding that the mice born to infected mothers
display a very clear PPI response to the 70 dB prepulse, which is only
5 dB above the background noise level (Fig. 4), suggests that the mice
had normal hearing.
Effect of the maternal immune response in the absence of virus
A fundamental question arising from these results is whether the
alterations in behavior that we observed in the offspring of infected
mothers are attributable to viral infection of the fetus or to a
reaction to the maternal immune response. In addition, if the
alterations are attributable to a maternal immune response reaction,
could there be antiviral antibodies causing pathology by binding an
epitope shared between the virus and the fetal brain? One approach to
investigating this issue is to evoke an antiviral-like immune response
in the mother without using a virus. This can be achieved by
intraperitoneal injection of the synthetic double-stranded RNA
poly(I:C). Poly(I:C) is known to evoke such an immune response in mice,
including upregulation of major histocompatibility complex expression, as well as interferon and other cytokines [see references in Cella et al. (1999) and Verdijk et al. (1999)]. We tested several doses (20, 10, 5, 2.5, and 0 mg/kg), and as shown in Figure
7, the offspring of the mothers injected
with the highest dose of poly(I:C) display a deficit in PPI. This
deficit is similar to that found in the offspring of virally infected
mothers. Therefore, the maternal immune response, in the absence of
virus, is sufficient to cause this behavioral change in the offspring.
Similar results were obtained in a second, independent experiment.
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Figure 7.
The effect of maternal immune response in the
absence of virus. Pregnant BALB/c mice were injected intraperitoneally
on day 9.5 of pregnancy with one of three doses of poly(I:C) to evoke
an antiviral-like immune response. The offspring were tested for PPI at
4 dB prepulse levels at 6-8 weeks of age. At the highest dose of
poly(I:C), the offspring displayed a significant deficit in PPI
(*p < 0.05; **p < 0.01)
(n = 10 for each group; 5 females
each).
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Discussion |
Our data on mice born to influenza virus-infected mothers show
highly significant changes in behavior in the open-field, novel-object, and social interaction tests. These alterations in behavior likely reflect hyperanxiety in novel or stressful situations, which is a
prominent feature of autism. Difficulty in handling stress also is
observed in schizophrenia. In addition, these mice display a deficit in
PPI and very distinctive PPI responses to acute administration of
psychomimetic and antipsychotic drugs. Deficits in PPI are observed in
several mental illnesses, including schizophrenia (Geyer et al., 1999)
and autism (McAlonan et al., 2002). The strikingly abnormal responses
to psychomimetic and antipsychotic drugs that we found in these mice
suggest the possibility of alterations in dopaminergic and
glutamatergic systems. A current theory of schizophrenia posits an
imbalance in these two systems; such an imbalance in these mice could
underlie their drug responses. Recent work also has identified changes
in the glutamate neurotransmitter system in autism (Purcell et al.,
2001). Therefore, the behavior of the mice born to infected mothers is
consistent with that expected for a rodent version of schizophrenia and
possibly autism. None of the tests used is specific for either of these
disorders, however. There are several other viral infection models,
primarily using postnatal rats, that also display significant
behavioral abnormalities (for review, see Hornig and Lipkin, 2001;
Pearce, 2001; Patterson, 2002).
The striking behavioral changes in mice born to infected mothers
suggest that brain development was altered by this perturbation of the
fetal environment. Using the same maternal influenza virus infection
paradigm, we previously found several alterations in brain histology
(Cotter et al., 1995; Fatemi et al., 1999). It will be
interesting to determine which of these (or other) molecular and
morphological alterations correlates best with the PPI deficit found in
the experimental mice. Such findings could shed light on the brain
circuitry and the molecules involved in normal PPI and the acoustic
startle response and, by analogy, on changes in autistic and
schizophrenic subjects that exhibit PPI abnormalities.
The larger question is this: how does viral infection of the mother
affect fetal brain development? We suspect that it is unlikely that the
influenza virus actually infects the fetal brain because nonlethal
strains of the virus are restricted most often to the respiratory
tract, where cytokine responses are critical for the resolution of
infection (Williams and MacKenzie, 1977; Irving et al., 2000; Tumpey et
al., 2000; Van Reeth, 2000). Although the strain that we used can be
neurotropic (Stuart-Harris et al., 1985), we were unable to detect
virus in the brains of neonatal mice born to infected mothers using a
plaque assay and cultured brain tissue (R. W. Sidwell, unpublished
observations). Tests for antiviral antibody staining of the brains were
negative, and there were no signs of encephalitis in sections from
these neonatal brains (S. H. Fatemi, unpublished observations). In
addition, preliminary RT-PCR assays failed to detect viral RNA in
brains from fetuses taken from infected mothers (N. Tu, L. Shi, and
P. H. Patterson, unpublished observations).
Perhaps more important, we found PPI deficits in the offspring of
mothers injected with the synthetic double-stranded RNA poly(I:C),
which evokes an antiviral-like immune response in mice. This indicates
that the maternal immune response is sufficient to cause changes in the
behavior of adult offspring, at least for PPI. Potential effectors of
altered fetal brain development in this model then would include
corticosteroids and cytokines. These possibilities are amenable to
experimental manipulation. Such data then could be used to test
therapeutic manipulations in ameliorating or preventing the deleterious
effects of influenza virus infection on fetal brain development. In
light of the evidence (cited in the introductory remarks) that maternal
viral infection increases the risk of schizophrenia and autism, it is
interesting that various immune abnormalities have been reported in
schizophrenia (Wright and Murray, 1993; Muller et al., 1999; Nawa et
al., 2000; Boin et al., 2001; Rothermundt et al., 2001) and autism
(Burger and Warren, 1998; Jyonouchi et al., 2001).
We chose day 9.5 for infection in this study because it is
approximately mid-pregnancy in the mouse, and human epidemiological studies highlight the second trimester as the critical time for influenza as a risk factor. This stage in the mouse coincides with
neural crest migration to the face and midbrain and the time that
Cajal-Retzius cells produce Reelin. Reelin is important in neuroblast
migration, and its expression is abnormal in schizophrenic brains (Impagnatiello et al., 1998; Fatemi et al., 1999), which is consistent with the developmental theory of this disorder (Marenco and Weinberger, 2000; Nawa et al., 2000; Torrey and Yolken, 2000). Given that several parts of the mouse brain develop later than in the
human, the study of mice born to mothers with late-pregnancy infections
could reveal equally interesting results.
In addition to the relevance of this work to mental illness,
investigation of potential therapeutic avenues is important because of
the serious problems caused by maternal influenza infection in humans.
Such infections can have serious consequences for the fetus, including
miscarriage, premature birth, stillbirth, and early neonatal mortality,
and there is also an increased risk of mortality for the mother (Shahab
and Glezen, 1994).
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FOOTNOTES |
Received July 26, 2002; revised Oct. 22, 2002; accepted Oct. 24, 2002.
This work was supported by a gift from Ginger and Ted Jenkins and a
Mettler Autism grant to P.H.P. S.H.F. is a Phyllis and Perry
Schwartz National Alliance for Research on Schizophrenia and Depression
Established Investigator. R.W.S. was supported by Contract N01-AI-65291
from the Virology Branch, National Institute of Allergy and Infectious
Diseases, National Institutes of Health. We thank D. McDowell and F. Rooks for administrative help, J. Baer for assistance with mice, and L. Tecott for advice on behavioral tests.
Correspondence should be addressed to P. H. Patterson, Division of
Biology 216-76, California Institute of Technology, Pasadena, CA 91125. E-mail: php{at}caltech.edu.
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TOP
ABSTRACT
Introduction
