The Journal of Clinical Endocrinology & Metabolism Vol. 83, No. 11 4022-4025
Copyright © 1998 by The Endocrine Society
11ß-Hydroxysteroid Dehydrogenase Type 2 in Human Lung: Possible Regulator of Mineralocorticoid Action
Takashi Suzuki,
Hironobu Sasano,
Satoshi Suzuki,
Gen Hirasawa,
Junji Takeyama,
Yasunari Muramatsu,
Fumiko Date,
Hiroshi Nagura and
Zygmunt S. Krozowski
Department of Pathology, Tohoku University School of Medicine
(T.S., H.S., G.H., J.T., Y.M., F.D., H.N.), and the Department of
Thoracic Surgery, Institute of Development, Aging and Cancer, Tohoku
University (S.S.), Sendai 980-8575, Japan; and the Laboratory of
Molecular Hypertension, Baker Medical Research Institute (Z.S.K.),
Melbourne, Australia
Address all correspondence and requests for reprints to: Takashi Suzuki M.D., Department of Pathology, Tohoku University School of Medicine, 21 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan. E-mail:
t-suzuki{at}patholo2.med.tohoku.ac.jp
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Abstract
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11ß-Hydroxysteroid dehydrogenase type 2 (11ßHSD2) catalyzes the
conversion of cortisol to biologically inactive cortisone and is
thought to confer specificity on mineralocorticoid receptors (MR).
Cortisol is a prerequisite for surfactant synthesis and fetal lung
maturation. Recently, expression of 11ßHSD2 was demonstrated in human
fetal lung, but its localization and possible biological roles remain
unknown. Therefore, in this study, we examined immunohistochemical
localization of 11ßHSD2, MR, and glucocorticoid receptor (GR) in
nonpathological human lungs from fetus to adult (8 weeks gestation to
55 yr of age; n = 40) retrieved from pathology files. Both
11ßHSD2 and MR immunoreactivities were detected in airway epithelia,
from bronchiole to trachea and in fetal and neonatal ciliated
collecting duct cells of tracheal and bronchial glands, but were
undetectable in alveoli. On the other hand, GR was detected in all cell
types. These results indicate that 11ßHSD2 colocalizes with MR in
human airway epithelia and suggest that 11ßHSD2 play an important
role in pulmonary mineralocorticoid activity such as sodium and fluid
transport.
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Introduction
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11ß-HYDROXYSTEROID dehydrogenase type 2 (11ßHSD2)
catalyzes the conversion of bioactive glucocorticoid,
cortisol, to the hormonally inactive 11-keto metabolite, cortisone,
regulating the access of cortisol to glucocorticoid (GR) or
mineralocorticoid (MR) receptor (1, 2, 3). 11ßHSD2 is highly expressed
in the human placenta and various fetal tissues (1, 4, 5, 6), and is
thought to protect the developing fetus from the high levels of
maternal cortisol. 11ßHSD2 has also been reported in adult human
mineralocorticoid target tissues, including kidney, pancreas, salivary
glands, and colon (7, 8), where it confers mineralocorticoid
specificity by protecting the nonselective MR from cortisol occupation
(9, 10). Recently, Hirasawa et al. (11) used
immunohistochemistry on mirror sections and image analysis to
demonstrate colocalization of 11ßHSD2 and MR in a range of human
epithelia. It appears from this and previous studies that 11ßHSD2
regulates glucocorticoid and mineralocorticoid actions locally. To
better understand the biological role of 11ßHSD2 in the lung, it is
important to explore correlations between the distribution of 11ßHSD2
and that of the corticosteroid receptors.
It is well known that cortisol is a prerequisite for the induction of
surfactant synthesis (12) and fetal lung maturation (13). Recently,
expression of 11ßHSD2 was demonstrated in the homogenized human fetal
lung (5, 6), but its localization and possible biological roles remain
unknown. Therefore, in this study we examined the immunohistochemical
localization of 11ßHSD2, MR, and GR in nonpathological human lung at
various stages of development from fetus through to adult to evaluate
possible involvement of corticosteroids in human lung maturation and
pulmonary function.
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Materials and Methods
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Human lung tissues
Forty cases of nonpathological human lung were obtained at
elective abortion (821 weeks gestation) from Tohoku University
Hospital and the affiliated hospitals in Sendai, Japan, or were
retrieved from autopsy files of Tohoku University Hospital (2241
weeks gestation, and 1 day to 55 yr of age). This study protocol was
approved by the committee on the ethics of Tohoku University School of
Medicine. Lung tissues were fixed in 10% formalin and embedded in
paraffin wax. Histological examination revealed no significant
pathological abnormalities. Nonpathological human lungs were classified
according to the criteria of Carlson (14): pseudoglandular phase (816
weeks gestation; n = 6), canalicular phase (1726 weeks
gestation; n = 8), terminal sac phase (2641 weeks gestation;
n = 12), and lungs after birth (1 day to 55 yr of age; n =
14). Immunostaining was performed on serial sections.
Antibody production and characterization
The generation and characterization of the primary antibodies
for 11ßHSD2 (HUH23) and MR (MINREC4) have been described previously
(7, 15). Briefly, HUH23 is an immunopurified polyclonal antibody raised
in rabbits against a synthetic peptide corresponding to the last
16 amino acid residues of human 11ßHSD2. The polyclonal antibody
MINREC4 was raised in rabbits against a synthetic fusion protein
corresponding to 167 amino acids of the N-terminal region of the
human renal MR. Application of these antibodies to immunohistochemistry
was reported previously (11, 16). Monoclonal antibody for GR (NCL-GCR)
was purchased from Novocastra Laboratories (Newcastle, UK).
Immunohistochemistry
Immunohistochemical analyses were performed employing the
streptavidin-biotin amplification method using a Histofine Kit
(Nichirei, Tokyo, Japan) and were described in detail previously (16, 17). For GR immunostaining, the slides were heated in an autoclave at
120 C for 5 min in citric acid buffer (2 mmol/L citric acid and 9
mmol/L trisodium citrate dehydrate, pH 6.0) after deparaffinization.
The HUH23 antibody was used at a final concentration of 5 µg/mL,
MINREC4 was used at a dilution of 1:600, and NCL-GCR was diluted 1:100.
The antigen-antibody complex was visualized with 3,3'-diaminobenzidine
solution [1 mmol/L 3,3'-diaminobenzidine, 50 mmol/L Tris-HCl buffer
(pH 7.6), and 0.006% H2O2] and counterstained
with methyl green. Tissue sections of normal kidney obtained at autopsy
were used as positive controls for 11ßHSD2 and MR (11), and those of
lung carcinomas were used for GR (18). For negative controls, preimmune
rabbit serum or normal mouse IgG was used instead of the primary
antibodies, and no specific immunoreactivity was detected in these
sections.
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Results
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The results of immunohistochemical staining of 11ßHSD2, MR, and
GR in nonpathological human lungs are summarized in Table 1
. 11ßHSD2 immunoreactivity was present
in the cytoplasm, and MR immunoreactivity was detected predominantly in
the cytoplasm with some nuclear staining. GR immunoreactivity was
present in the nuclei of all cell types in all specimens of human lung
examined in this study.
In the pseudoglandular phase of fetal lungs, both 11ßHSD2 and MR
immunoreactivities were detected weakly in bronchi lined by columnar
epithelia with marked variations in their immunointensity, but staining
was not detected in mesenchymal cells. In the canalicular phase,
11ßHSD2 and MR immunoreactivities were present in terminal
bronchiolar budding components (respiratory bronchioles) lined by
columnar epithelia, but was not detected in other components of
terminal bronchioles or loose mesenchymal cells (Fig. 1A
). 11ßHSD2 and MR immunoreactivities
were marked in bronchi and trachea lined by ciliated epithelia and
ciliated collecting ducts of bronchial and tracheal glands, but was not
present in the acinar cells (Fig. 1
, B and C). In the terminal sac
phase, 11ßHSD2 and MR immunoreactivities were widely distributed in
ciliated epithelia from terminal bronchiole to trachea, but were not
present in alveoli (Fig. 2
, A and B). The
distribution of 11ßHSD2 and MR in lungs after birth was the same as
that in the terminal sac phase in fetal lungs. However, the relative
immunointensity of 11ßHSD2 and MR in lungs after birth, especially in
the proximal airway, tended to be weaker than that in the terminal sac
phase, although variations in the immunointensity were observed (Table 1
).

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Figure 1. Immunohistochemistry of 11ßHSD2 (A and B)
and MR (C) in canalicular phase fetal lung (21 weeks gestation). A,
Immunoreactivity of 11ßHSD2 was observed in budding terminal
components of bronchioles (respiratory bronchioles) lined by columnar
epithelia (arrows), whereas other components of terminal
bronchioles or loose mesenchymal cells were negative for 11ßHSD2
(original magnification, x245). 11ßHSD2 (B) and MR (C)
immunoreactivities were detected in trachea lined by ciliated epithelia
and collecting ciliated duct of the tracheal gland
(arrow), but was not detected in the acinar cells
(original magnification, x178, respectively).
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Figure 2. Immunohistochemistry of 11ßHSD2 (A) and GR
(B) in terminal sac phase fetal lung (31 weeks gestation). A, 11ßHSD2
immunoreactivity was detected in ciliated epithelia from terminal
bronchiole to trachea, but was not present in alveoli (original
magnification, x178). B, GR immunoreactivity was present in the nuclei
of all cell types including bronchioles and alveoli (original
magnification, x245).
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Discussion
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Glucocorticoids have been demonstrated to play important roles not
only in the structural development of organs but also in the maturation
and programming of homeostatic systems (19, 20). However, excessive
glucocorticoid can be harmful to the developing fetus, resulting in
reduced birth weight and predisposition to hypertension in adulthood
(21). The ratio of plasma cortisol/cortisone is approximately 10:1 in
the adult, but is only 1:2 in the fetus (22). Expression of 11ßHSD2
was reported in the human placenta and various fetal tissues, including
lung (1, 4, 5, 6). These findings suggest that 11ßHSD2 may serve to
modulate biologically active glucocorticoid concentrations in fetal
organs in an autocrine fashion (5). Human lung is a classical
glucocorticoid target tissue (6), and cortisol plays an important role
in surfactant synthesis by type II pneumocytes in alveoli (12).
Therefore, it was possible that the 11ßHSD2 present in alveoli of
terminal sac phase of the fetal lungs was involved in the regulation of
glucocorticoid actions in type II pneumocytes. However, the results of
our present study demonstrate that 11ßHSD2 was present in epithelial
cells of the airway in fetal lungs from pseudoglandular to terminal sac
phases, but not in the alveoli, throughout the course of lung
development. In addition, 11ßHSD2 immunoreactivity colocalized with
MR to specific cell types, whereas GR immunoreactivity was detected in
all cell types of the human lung. Krozowski and Funder (23) previously
demonstrated the presence of mineralocorticoid-specific high affinity
[3H]aldosterone-binding sites in the adult rat lung and
suggested that some cell types may be a physiological target for
aldosterone via MR in the lung. 11ßHSD2 is thought to confer
mineralocorticoid specificity by preempting nonselective binding of
cortisol to MR (9, 10) and to modulate access of glucocorticoids to the
GR. Hirasawa et al. (11) recently demonstrated that
11ßHSD2 colocalized with MR in sodium-transporting epithelia in adult
human tissues. Therefore, the results of our present study suggest that
11ßHSD2 plays an important role in the regulation of
mineralocorticoid action, i.e. sodium and fluid absorption,
in human fetal airway, rather than in the modulation of glucocorticoid
activity.
Little is known about the effects of mineralocorticoid in the fetal
lung, although this organ contains fluid at all stages of intrauterine
development. Lung liquid is not aspirated amniotic fluid, but is
actively produced by the fetal lung itself (24). Fetal pulmonary
development is dependent on lung fluid to maintain distention, and the
retention of liquid within the developing airway is required to
adequately expand the lungs to stimulate their growth (25). Various
studies have demonstrated that the fetal lung can function as both a
fluid-absorbing and a fluid-secreting organ (26, 27, 28). In our study,
immunoreactivity of 11ßHSD2 and MR was strongest in the columnar
epithelium of the respiratory bronchiole, the ciliated tracheal and
bronchial epithelium in the canalicular phase, and the ciliated
epithelium from bronchiole to trachea in the terminal sac phase.
Therefore, 11ßHSD2 and MR may be important for active fluid
absorption at these sites and may also contribute to the local
regulation of lung liquid.
The distribution of 11ßHSD2 and MR in neonatal lung was in good
agreement with the report by Hirasawa et al. (11) and was
the same as that observed in the terminal sac phase in fetal lungs.
Page et al. (29) demonstrated 11ßHSD2 activity in human
lung cells, and Cullen and Welsh (30) also reported that sodium
absorption is both acutely and chronically regulated by
mineralocorticoids in the canine tracheal epithelium. These findings
together with our present data suggest that 11ßHSD2 is also involved
in the modulation of mineralocorticoid action in airway epithelia after
birth. Immediately postpartum the lungs are cleared of lung liquid and
function as an organ of gas exchange. However, secretions form tracheal
and bronchial glands cover the entire surface of the respiratory tract
and facilitate mucosal cell function. Therefore, 11ßHSD2 may also
regulate secretion in the respiratory tract after birth. Variations in
relative 11ßHSD2 and MR immunointensity in the lungs after birth may
represent the influence of various exogenous factors, but further
investigations are required to clarify their biological
significance.
Received May 12, 1998.
Revised July 17, 1998.
Accepted July 22, 1998.
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