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Volume 16, Number 12, Issue of June 15, 1996 pp. 3943-3949
Copyright ©1996 Society for Neuroscience

Maternal Glucocorticoid Secretion Mediates Long-Term Effects of Prenatal Stress

Arnaud Barbazanges, Pier Vincenzo Piazza, Michel Le Moal, and Stefania Maccari

Psychobiologie des Comportements Adaptatifs, INSERM U259, Université de Bordeaux II, Domaine de Carreire, 33077 Bordeaux Cedex, France

ABSTRACT
INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
FOOTNOTES
REFERENCES

ABSTRACT

There is growing evidence that stressors occurring during pregnancy can impair biological and behavioral adaptation to stress in the adult offspring. Mechanisms by which stress in the pregnant rat can influence development of the offspring are still unknown. In the present study, we investigated the involvement of maternal corticosterone secretion during pregnancy on the hypothalamo-pituitary-adrenal axis activity of adult offspring. We investigated stress-induced corticosterone secretion and hippocampal type I and type II corticosteroid receptors in male adult rats submitted to prenatal stress born to either mothers with intact corticosterone secretion or mothers in which stress-induced corticosterone secretion was blocked by adrenalectomy with substitutive corticosterone therapy. Repeated restraint during the last week of pregnancy was used as prenatal stressor. Furthermore, the specific role of an injection of corticosterone before the restraint stress on adrenalectomized mothers with substitutive corticosterone treatment was also studied. We report here that blockade of the mother's stress-induced glucocorticoid secretion suppresses the prolonged stress-induced corticosteroid response and the decrease in type I hippocampal corticosteroid receptors usually observed in prenatally stressed adults. Conversely, corticosterone administered during stress, to mothers in which corticosterone secretion is blocked, reinstates the effects of prenatal stress. These results suggest for the first time that stress-induced increases in maternal glucocorticoids may be a mechanism by which prenatal stress impairs the development of the adult offspring's glucocorticoid response.

Key words: corticosterone; corticosteroid receptors; hippocampus; prenatal stress; maternal environment; development

INTRODUCTION

Prenatal environments exert profound influences on the development of an organism and can predispose it to adaptive disturbances in later life. In particular, in man, prenatal stress can induce mental retardation and sleep disturbances in the infant (Stott, 1973; Shell, 1981). In animals, dams stressed during pregnancy can bear offspring with reduced male sexual activity, enhanced emotional reactivity (Thompson, 1957; Ward and Weisz, 1984; Weinstock et al., 1988), and an increased propensity to self-administer drugs (Deminière et al., 1992). Stress during pregnancy sensitizes different neuroendocrine systems, such as gonadal axis (Ward, 1972) and hypothalamo-pituitary-adrenal (HPA) axis, increasing stress-induced corticosterone secretion in preweaning rats (Peters, 1982; Takahashi et al., 1988; Henry et al., 1994) and prolonging stress-induced corticosterone secretion in the adult (Fride et al., 1986; Maccari et al., 1995). Prenatal stress also decreases the number of hippocampal corticosteroid receptors (Maccari et al., 1995), which are the principal substrate of the negative feedback control of glucocorticoid secretion. Thus, a decrease in these corticosteroid receptors is accompanied by increased glucocorticoid secretion and vice versa. Two different cytosolic receptors contribute to this control: (1) the type I, or mineralocorticoid receptor; and (2) the type II, or glucocorticoid receptor (McEwen et al., 1986; De Kloet and Reul, 1987). In the adult, it has been shown that HPA axis disturbances are related to behavioral pathologies and early aging of cognitive performances (Sapolsky et al., 1986; Holsboer, 1989; Piazza et al., 1991).

In the present study, we addressed the following question: what are the pathophysiological mechanisms by which stress in the mother reaches the fetus and influences its development? One putative cause, in utero exposure to abnormally high levels of maternal glucocorticoids, seems to be a good candidate: (1) corticosterone secretion is one of the principal biological responses to stress (Selye, 1956); (2) glucocorticoids are very liposoluble and easily cross placental and blood-brain barriers (Zarrow et al., 1970); and (3) exposure in utero to high levels of synthetic glucocorticoids can have neurotoxic effects on monkey and human brain (Epstein et al., 1977; Reinisch et al., 1978) or rat fetal brain (Uno et al., 1990) and elevate systolic blood pressure in adult offspring (Benediktsson et al., 1993).

To test this hypothesis, we studied the effects of blocking maternal corticosterone secretion during the prenatal stress on the stress-induced corticosterone secretion and hippocampal corticosteroid receptors of adult offspring. Repeated restraint of the mother during the last week of pregnancy was used as prenatal stressors, and an adrenalectomy of the mother with a corticosterone-substitutive treatment was used to block the increase in corticosterone secretion induced by the restraint stress. Hippocampal corticosteroid receptors were determined, as the binding capacity of these receptors appears to be a principal regulating factor in corticosterone secretion (McEwen et al., 1986; De Kloet and Reul, 1987). Furthermore, the specific role of an injection of corticosterone on stressed mothers adrenalectomized with corticosterone-substitutive treatment was also studied on these same parameters in adult offspring.

Table 1. Plasma corticosterone concentrations after restraint stress in pregnant rats

Time post stress (min) Day 1 Plasma corticosterone (µg/100 ml)
 Blocked + corticosterone
Intact
Day 5 Day 7 Day 1 Day 5
 30 min 58.6  ± 3.8 74.1  ± 7.5 59.9  ± 4.2 82.9  ± 13.0 95.5  ± 23.5
105 min 42.7  ± 3.7* 33.4  ± 10.7* 25.2  ± 7.6* 33.0  ± 1.6* 9.6  ± 1.9*#
*p < 0.05 105 vs 30 min; #p < 0.01 day 5 vs day 1.

Our results show that the impairment induced by prenatal stress on the activity of the HPA axis of adult offspring depends on high levels of maternal corticosterone secretion during restraint stress. In fact, blocking stress-induced corticosterone secretion by adrenalectomy with corticosterone-substitutive treatment suppresses the prolonged stress-induced corticosterone response and the reduced type I hippocampal corticosteroid receptors observed in prenatally stressed adults. Furthermore, the administration of corticosterone to these mothers reinstates the effects induced by the prenatal stress.

MATERIALS AND METHODS

General methods Subjects. Virgin female Wistar rats weighing 250 gm were housed for 5 d in the presence of a sexually experienced Wistar male weighing 450-500 gm. Pregnant females were individually housed with ad libitum access to food and water in a constant light/dark cycle (light on at 6 hr, off at 20 hr), and temperature (22°C) and humidity (60%) were kept constant.

Prenatal stress. During the last week of pregnancy, pregnant females in the stress group were placed for 45 min in a transparent plastic cylinder in a lighted environment three times per day (9 A.M., 12 A.M., and 5 P.M.). This stress procedure, described by Ward and Weisz (1984), was chosen because it has an indirect influence on the fetus via a direct stress on the mother. Control female rats were left undisturbed in their home cages. Only litters containing 10-14 pups were selected for this study to eliminate extra stressors such as the removal of pups. The offspring were weaned 21 d after birth, and 1-3 male siblings were taken from each litter. The number of litters represented in each group was 5-10. At the time of weaning, the sex of the pups was also checked, and only litters containing a similar number of females and males were selected. Animals were tested at 90 d of age.

Adrenalectomy and substitutive treatment. For this purpose, females at 13 d of pregnancy were adrenalectomized (between 9 A.M. and 12 A.M.) via the dorsal approach and implanted subcutaneously, ~2 cm rostral to the skin incision, with a 100 mg corticosterone pellet (containing 50% corticosterone 21-hemisuccinate and 50% cholesterol), which provides stable basal levels of the hormone (Meyer et al., 1979). The adrenalectomy was performed under ether anesthesia. Pregnant females in the intact corticosterone secretion groups were sham-operated.

Corticosterone injection. The stressed mothers adrenalectomized with corticosterone-substitutive treatment received a subcutaneous injection of either saline (NaCl; 0.9% w/v) or corticosterone (3 mg/kg) concomitantly with stress. In a separate experiment, we showed that corticosterone injections in adrenalectomized pregnant rats elicit plasma corticosterone levels approximating those found in response to stress in intact mothers (Table 1).

Corticosterone assay. Corticosterone levels were determined in three blood samples (250 µl) withdrawn from the tail vein before stress, after 30 min restraint stress, and 120 min afterward. Restraint was performed in plastic cylinders identical to those used for the prenatal stress. Blood was collected in heparinized tubes. Corticosterone levels were determined by radioimmunoassay using a highly specific corticosterone antiserum (ICN Biochemicals) with a detection threshold of 0.1 µg/100 ml. The inter- and intra-assay variations were, respectively, 6 and 3.5% at a mean value of 1.5 ng per tube and 6.8 and 4% at a mean value of 10 ng per tube.

Type I and type II corticosteroid receptor binding. Type I and type II hippocampal corticosteroid receptor binding was measured 2 weeks after the restraint stress procedure. Between 8:00 and 10:00 A.M., hippocampi were rapidly dissected and frozen on dry ice. Tissues were stored at -80°C until receptor assay. To eliminate endogenous corticosterone, an exchange assay was used for both type I and type II corticosteroid receptors as described previously (Casolini et al., 1993; Maccari et al., 1995). The hippocampus of each rat was homogenized in 2 ml of ice-cold 30 mM Tris (TEDGM; pH adjusted to 7.4 with 6N HCl) containing 1 mM EDTA, 10 mM sodium molybdate, 1 mM dithiothreitol, and 10% glycerol, and centrifuged (105,000 g, 15 min in a Beckman TL100 ultracentrifuge) at 4°C. Endogenous, unbound steroids were removed from the soluble fraction by passing the sample through LH-20 columns filled using Pasteur pipette tips and equilibrated with TEGM buffer (10 mM Tris, 2 mM EDTA, 10 mM sodium molybdate, and 2.3 mM beta -mercaptoethanol). For the type I receptor assay, aliquots of cytosol (140 µl) were incubated with tritiated corticosterone (specific activity 88 Ci/mmol, DuPont NEN) over a concentration range of 1.25-40 nM (6 points for each Scatchard plot) and with a 100-fold excess of unlabeled RU 28362. Unlabeled RU 28362 was used to displace 3H-B from type II receptors. Type II receptor binding was evaluated directly using the pure glucocorticoid, 3H-RU 28362 (specific activity 74.3 Ci/mmol, Dositek) over a concentration range of 1.25-40 nM (6 points for each Scatchard plot). Nonspecific binding for 3H-B was determined in the presence of a 500-fold excess of unlabeled corticosterone, and for 3H-RU 28362 in the presence of a 500-fold excess of unlabeled RU 28362. Binding equilibrium was reached after 22 hr at 4°C. This has been shown to be sufficient for maximal exchange, and binding remains stable over this period (Kalimi and Hubbard, 1983; Meaney et al., 1988). Although exchange may not be complete, it is comparable in all experimental groups. Bound and unbound 3H-B or 3H-RU 28362 were separated on Sephadex LH-20 columns equilibrated with TEGDM buffer at 2°C, using 60 µl of the incubates eluted with 940 µl of TEGDM buffer. One milliliter of the eluate containing the bound form was added to 3.5 ml of scintillation fluid (Acqualuma, Lumac), and radioactivity was counted. Protein concentrations were determined according to Lowry et al. (1951) using albumin as standard. The apparent maximum binding capacity (Bmax) of 3H-B or 3H-RU 28362 and dissociation constants (Kd) for both types of receptors were evaluated from Scatchard plots (Scatchard, 1949) generated for each animal individually.

Procedures Experiment 1: influence of blocking maternal corticosterone secretion during restraint stress on corticosterone and corticosteroid receptors of adult offspring. In this experiment, four groups of rat offspring were compared: two groups born to either control or stressed mothers with intact corticosterone secretion and two groups born to either control or stressed mothers in which stress-induced corticosterone secretion was blocked by adrenalectomy associated with a substitutive corticosterone treatment. At 90 d of age, offspring were submitted to a 30 min restraint stress. Restraint was performed in plastic cylinders identical to that used for the prenatal stress. Corticosterone levels were determined in three blood samples (250 µl) withdrawn from the tail vein. The three samples were collected at the beginning and end of the 30 min stress and 120 min afterward. For the collection 120 min after the stress, the rat was again put in the restraint cage for <2 min. Type I and type II hippocampal corticosteroid receptor binding was measured 2 weeks later.

Experiment 2: influence of corticosterone injections during restraint stress to the mothers on corticosterone and corticosteroid receptors of adult offspring. In this experiment, to study the specific role of maternal corticosterone, four groups of rat offspring were compared: two groups were offspring of stressed mothers whose corticosterone secretion was either intact or blocked, and two groups were from stressed mothers having blocked corticosterone secretion, which received a subcutaneous injection of either saline (NaCl; 0.9% w/v) or corticosterone (3 mg/kg) concomitantly to stress. Also in this experiment, at 90 d of age, offspring were submitted to a 30 min restraint stress. Basal and stress corticosterone levels were determined as described previously. Type I and type II hippocampal corticosteroid receptor binding was measured 2 weeks later.

Statistics. The results were compared by two-way bifactorial analysis (ANOVA). In the first experiment, the two between factors were: (1) stress (two levels, presence/absence); and (2) maternal corticosterone (two levels, intact/blocked). In the second experiment, the two between factors were: (1) corticosterone (two levels, high/low); and (2) subcutaneous injection (two levels, presence/absence).

RESULTS

Experiment 1. Influence of blocking maternal corticosterone secretion during restraint stress on stress-induced corticosterone secretion and hippocampal corticosteroid receptors of adult offspring

At 3 months of age, offspring of stressed mothers whose corticosterone secretion was intact showed a prolonged stress-induced corticosterone secretion (Fig. 1) and decreased hippocampal type I corticosterone receptors (Fig. 2). Type I and type II hippocampal corticosteroid receptor binding had been measured 2 weeks after the restraint stress procedure, and the hippocampi were dissected between 8:00 and 10:00 A.M. In contrast, offspring of stressed mothers whose corticosterone secretion was blocked did not differ from rats of control mothers for any of the parameters studied. A bifactorial analysis was used, and the two between factors were: (1) stress (presence/absence); (2) maternal corticosterone (Intact/blocked). The following main effects and interactions were significant: (1) stress-induced corticosterone secretion [Stress × Maternal Corticosterone × Time Interaction; F(2,92) = 4.997; p = 0.008]; (2) corticosterone 2 hr after stress [Stress × Maternal Corticosterone Interaction; F(1,46) = 8.34; p = 0.006]; and (3) type I receptors [Stress × Maternal Corticosterone Interaction; F(1,45) = 14.46; p = 0.0005].
Fig. 1. Plasma corticosterone secretion after restraint stress in control and prenatally stressed offspring of mothers with intact (14-20 animals/group) or blocked (7-10 animals/group) stress-induced corticosterone secretion. The experimental groups did not differ in corticosterone secretion in basal conditions (left panel) or 30 min after stress (middle panel). At 120 min after stress (right panel), prenatally stressed animals, the mothers of which were in the intact group, had higher corticosterone levels than controls. Prenatally stressed rats whose mothers' corticosterone secretion was blocked did not differ from controls. ***p < 0.001. Error bars represent SEM.
[View Larger Version of this Image (41K GIF file)]

Fig. 2. Hippocampal corticosteroid receptors in control and prenatally stressed offspring of mothers with intact (14-20 animals/group) or blocked (7-10 animals/group) stress-induced corticosterone secretion. Type I corticosteroid receptors were lower in prenatally stressed rats from mothers with intact corticosterone secretion, whereas prenatal stress had no effect on this measure when maternal corticosterone secretion was blocked (left panel). No significant effects were found on the Bmax of type II receptors (right panel) or in the affinity of either receptor type. Mean affinities were (in nM): type I = 1.66 ± 0.17; type II = 1.14 ± 0.21. ***p < 0.001. Error bars represent SEM.
[View Larger Version of this Image (36K GIF file)]

Experiment 2. Influence of high levels of maternal corticosterone during restraint stress on stress-induced corticosterone secretion and hippocampal corticosteroid receptors of adult offspring

Offspring of mothers in which corticosterone levels were high during stress had a longer stress-induced corticosterone secretion (Fig. 3) and lower hippocampal type I corticosteroid receptors (Fig. 4) than animals whose mothers had low corticosterone levels. The two between factors were: (1) corticosterone (high/low); (2) subcutaneous Injection (presence/absence). The following main effects and interactions were significant: (1) stress-induced corticosterone secretion [Corticosterone × Time Interaction; F(2,78) = 8.308; p = 0.0005]; (2) corticosterone levels 2 hr after stress [Corticosterone Effect; F(1,39) = 11.342; p = 0.0018]; (3) type I corticosterone receptors in the hippocampus [Corticosterone Effect; F(1,31) = 12.38; p = 0.0015]. Because the injection itself had no effect and no significant interaction was found between the two main factors in Figs. 3 and 4, results were collapsed over the injection factor.
Fig. 3. Plasma corticosterone secretion after restraint stress in prenatally stressed rats, the mothers of which had either low (5-10 animals/group) or high (10-14 animals/group) corticosterone levels when submitted to stress during pregnancy. There were no significant differences in corticosterone secretion in basal conditions (left panel) or 30 min after stress (middle panel), whereas prenatally stressed rats from mothers having high corticosterone levels had a prolonged stress-induced corticosterone secretion (right panel). ***p < 0.001. Error bars represent SEM.
[View Larger Version of this Image (33K GIF file)]

Fig. 4. Hippocampal corticosteroid receptors in rats, the mothers of which had either low (5-10 animals/group) or high (10-14 animals/group) corticosterone levels when submitted to stress during pregnancy. Type I corticosteroid receptors were lower in animals from mothers having high corticosterone levels (left panel). No differences were found in the Bmax of type II receptors (right panel) or in the affinities of either receptor type. Mean affinities were (in nM): type I = 1.71 ± 0.15; type II = 1.56 ± 0.30. ***p < 0.001. Error bars represent SEM.
[View Larger Version of this Image (31K GIF file)]

DISCUSSION

Taken together, these results suggest that disruption of the hormonal response to stress observed in prenatally stressed individuals depends on stress-induced increases in maternal glucocorticoids. The characteristic impairment of HPA axis activity normally seen in prenatally stressed rats was suppressed by blocking the mother's stress-induced corticosterone secretion, using adrenalectomy associated with a corticosterone replacement treatment. Conversely, the effects of prenatal stress were reinstated by peripheral administration of corticosterone (at doses mimicking stress levels) to these mothers.

The present findings are in agreement with data showing that exposure of pregnant rats to alcohol, a procedure that stimulates maternal glucocorticoid secretion, results in a hyperactive HPA axis in the offspring (Rivier et al., 1984; Lee et al., 1990). However, exogenous prenatal corticosterone replacement did not have the same effect as prenatal ethanol exposure (Lee and Rivier, 1992), probably because the corticosterone replacement was made from days 8 to 14 of gestation and the fetal HPA axis is not functional until the middle of the third week of gestation (Bugnon et al., 1982). Similarly, nonabortive maternal infections, which increase maternal glucocorticoids (Besedovsky et al., 1975; Dunn, 1992), compromise the development of the fetal brain and alter HPA axis functioning in the adult (Reul et al., 1994). However, maternal factors other than corticosterone can also contribute to long-term HPA reactivity in the adult male offspring. Thus, we have previously shown that the increased postnatal maternal care induced by an early adoption reverses the long-term effects on HPA reactivity induced by prenatal stress (Maccari et al., 1995).

Of the many actions of maternal glucocorticoids during development, at least two may account for the observed effects on the offspring's HPA axis. (1) High glucocorticoid levels may alter the HPA axis development by downregulating fetal hippocampal corticosteroid receptors, which are already fully expressed during the last week of gestation (Meaney et al., 1985; Rosenfeld et al., 1988). (2) High glucocorticoid levels may modify glucocorticoid secretion in the offspring by acting on the developing noradrenergic systems. Indeed, prenatal stress is known to increase the turnover of brain norepinephrine in adult rats (Takahashi et al., 1992), and norepinephrine exerts a direct inhibitory control on hippocampal corticosteroid receptors, thus facilitating corticosterone secretion (Maccari et al., 1992; Yau and Seckl, 1992).

The decrease in hippocampal type I corticosteroid receptors observed in prenatally stressed rats could account for their prolonged stress-induced corticosterone secretion. Hippocampal corticosteroid receptors appear to play an important role in this process, as it has been shown that a selective reduction in hippocampal corticosteroid receptors is accompanied by a prolonged corticosterone secretion in response to stress (McEwen et al., 1986; Sapolsky et al., 1986). In view of their affinities for corticosterone, it is generally thought that type II receptors are involved in stress-induced feedback mechanisms, whereas type I receptors are involved in the tonic regulation of corticosterone release under basal conditions (De Kloet and Reul, 1987). Thus, in the present study, the observed decrease in hippocampal type I receptors might not be expected to be involved in stress-modulated feedback control. However, there is now evidence that both receptor types are involved in feedback control mechanisms. The administration of type I antagonists induces prolonged adrenocortical secretion after stress (Ratka et al., 1989), and the occupancy of both types of receptors in the hippocampus by corticosterone is required for the feedback suppression of corticotropin-releasing factor secretion during stress (Sapolsky et al., 1990). In addition, Dallman et al. (1989) suggested that the effect of corticosterone on basal adrenocorticotropic hormone secretion is mediated by association with type I receptors, and not type II. This idea is also supported by two further observations. First, an early adoption, which suppresses the prolonged corticosterone secretion in prenatally stressed animals, also increases type I receptors in the hippocampus (Maccari et al., 1995). Second, a selective reduction in type I hippocampal corticosteroid receptors has been found to be associated with a prolonged stress-induced corticosterone secretion in chronically social stressed animals, akin to that observed in prenatally stressed rats (Maccari et al., 1991).

It should be noted that the assay used to measure the above-mentioned changes in corticosteroid receptors was an exchange assay for both type I and type II corticosteroid receptors to eliminate endogenous corticosterone as described previously (Kalimi and Hubbard, 1983; Meaney et al., 1988; Casolini et al., 1993; Maccari et al., 1995). It is important to consider that although exchange may not be complete, it is comparable in all experimental groups given that the corticosterone concentrations in the different groups of rats at the time of killing were at their basal levels and, thus, essentially the same across treatment groups. It can therefore be assumed that the decrease in type I corticosteroid receptors was not attributable to a different occupancy of this type of receptor by corticosterone. However, future studies should address whether the mRNA for the type I receptor is also lower in these animals.

There is strong evidence indicating that increased corticosterone levels in prenatal and postnatal life have opposite effects on adult corticosterone secretion. Thus, in contrast to the present results, corticosterone secretion is reduced in adult rats that have received corticosterone during the first week after birth (Turner and Taylor, 1976; Catalani et al., 1993). Although seemingly contradictory, these profound differences in corticosterone's effects in the prenatal versus postnatal period might be explained by a difference in the maturational status of hippocampal corticosteroid receptors in fetus versus pup. During the last week of fetal life, levels of corticosteroid receptors are similar to those in adults, whereas at birth their number is profoundly decreased, increasing again only at 12-14 d of age (Meaney et al., 1985; Rosenfeld et al., 1988).

In conclusion, the present report clearly shows the major influence of maternal glucocorticoids on the development of endocrine function in the offspring. Our results suggest that the high level of maternal glucocorticoids during prenatal stress, when the fetal HPA axis is developing, has marked long-term repercussions on the efficiency of the offspring's HPA negative feedback mechanisms. Furthermore, given the influence of maternal glucocorticoids on brain development, the antenatal glucocorticoid treatment currently used for reducing the frequency of respiratory distress syndrome and neonatal death (Farrell and Nitzan, 1979; Ballard et al., 1980; National Institutes of Health Consensus Statement, 1994) may not be without negative long-term side effects.

FOOTNOTES

Received Jan. 11, 1996; revised April 2, 1996; accepted April 3, 1996.

  

This work was supported by Institut National de la Santé et de la Recherche Médicale, Université de Bordeaux II and Conseil Regional d'Aquitaine. We thank Dr. J. Day for helpful comments and Roussel-UCLAF for providing RU 28362.

Correspondence should be addressed to Stefania Maccari, Institut National de la Santé et de la Recherche Médicale U259, Université de Bordeaux II, Domaine de Carreire, Rue Camille Saint Saëns, 33077 Bordeaux Cedex, France.


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