The Journal of Clinical Endocrinology & Metabolism Vol. 82, No. 11 3859-3863
Copyright © 1997 by The Endocrine Society
Colocalization of 11ß-Hydroxysteroid Dehydrogenase Type II and Mineralocorticoid Receptor in Human Epithelia
Gen Hirasawa,
Hironobu Sasano,
Ken-ichi Takahashi,
Kouhei Fukushima,
Takashi Suzuki,
Nobuo Hiwatashi,
Takayosi Toyota,
Zygmunt S. Krozowski and
Hiroshi Nagura
Departments of Pathology (G.H., H.S., K-I.T., T.S., H.N.), Medicine
(G.H., N.H., T.T.), and Surgery (K.F.), Tohoku University School of
Medicine, Sendai, Japan; Laboratory of Molecular Hypertension (Z.S.K.),
Baker Medical Research Institute, Prahran, Australia
Address correspondence and requests for reprints to: Hironobu Sasano, M.D., Department of Pathology, Tohoku University School of Medicine, 2-1 Seiryou-machi, Sendai, Japan 980.
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Abstract
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The enzyme 11ß-hydroxysteroid dehydrogenase type II (11ßHSD2) has
been shown to confer specificity on mineralocorticoid receptors (MR) by
inactivating glucocorticoids. In the present study we examined the
colocalization of 11ßHSD2 and MR in various exocrine and secretory
glands by immunostaining of serial mirror tissue sections with
subsequent computerized image analysis. Both 11ßHSD2 and MR proteins
were expressed in the same cells in the distal convoluted tubules,
Henles loop, and collecting tubules of the kidney and the absorptive
epithelia of duodenum, jejunum, ileum, colon, and excretory ducts of
anal and esophageal glands. Significantly, 11ßHSD2 and MR
immunoreactivity also colocalized in the respiratory tract, in
collecting ducts of the tracheal and bronchial glands, ciliated
bronchial epithelial cells, and type II alveolar epithelial cells,
suggesting important and unexpected roles for mineralocorticoids in the
lung. In the skin, 11ßHSD2 and MR were present only in excretory
ducts of eccrine sweat glands, but not in sebaceous or apocrine glands.
In eccrine glands, MR immunoreactivity was present in the basal cells
of excretory ducts, while 11ßHSD2 immunoreactivity was localized in
the luminal cells. Neither 11ßHSD2 nor MR proteins were expressed in
the lacrimal gland, prostate, bile ducts, gall bladder, urinary
bladder, urethra, or ureter. These results indicate that 11ßHSD2
protein colocalizes with MR protein in the great majority of
sodium-transporting epithelia involved in serous secretion and supports
the proposal that 11ßHSD2 is a pivotal determinant of
mineralocorticoid receptor occupancy in man. Furthermore, our
demonstration of colocalization in discrete areas of the lung suggests
that mineralocorticoid agonists or antagonists, and/or inhibitors of
11ßHSD2, may have unexpected applications in respiratory disease.
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Introduction
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THE ENZYME 11ß-hydroxysteroid
dehydrogenase type II (11ßHSD2) is thought to confer specificity on
the nonselective mineralocorticoid receptor (MR) (1) by converting
glucocorticoids to their receptor inactive metabolites, thereby
allowing the much lower circulating level of aldosterone to bind to
mineralocorticoid receptors (2, 3). When 11ßHSD2 is compromised,
patients manifest severe hypertension, marked sodium retention, and
hypokalemia (4, 5). Recent studies prove that selective aldosterone
action requires the colocalization of MR and the enzyme 11ßHSD2 in
target cells (6, 7, 8, 9).
In man, immunolocalization of MR has been reported in classic
mineralocorticoid target tissues including kidney, pancreas, salivary
and sweat glands, and gastrointestinal tracts (10, 11, 12, 13, 14), and that of
11ßHSD2 in kidney, gastrointestinal tracts, sweat, and salivary
glands (15, 16, 17, 18, 19). To better understand mineralocorticoid action, it is
important to determine whether MR and 11ßHSD2 proteins are expressed
in the same cells or not. However, detailed intraglandular localization
of 11ßHSD2 and MR, in particular colocalization, has not been
established in man or other species. Therefore, in this study, we
examined immunolocalization of MR and 11ßHSD2 in the same cells or
tissues of various human exocrine or secretory glands including sodium
transporting systems by employing immunostaining of serial mirror
tissue sections and subsequent computer assisted image analysis.
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Materials and Methods
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Antibody production and characterization
The generation and characterization of the HUH23 and MINREC4
have been described previously (11, 12, 14, 15, 17). 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 mineralocorticoid
receptor.
Tissue collection and preparation
Nonpathologic human tissues were obtained from autopsy files
(choroid plexus, bronchus, and trachea) and from surgical pathology
files (other specimens) of The Tohoku University Hospital, Sendai,
Japan. Histological examinations of these specimens revealed no
significant pathologic abnormalities. Two serial 3 µm tissue sections
were prepared and mounted on clean glue-coated glass slides, with the
cut surfaces serving as mirror images, in order to examine expression
of the enzyme and receptor in the same cell.
Immunostaining
Details of immunostaining were reported previously by the
authors (11, 12). A pair of mirror image section were individually
treated with the HUH23 antibody and MINREC4 for 18 h at 4C in a
moist chamber (optimal dilutions; HUH23 antibody 1:70 and MINREC4
1:600, both diluted with 0.01 M PBS). The Biotin-Strept Avidin
immunostaining system using the Histofine kit (Nichirei Co, Tokyo,
Japan) was used. The specificity of immunohistochemical staining was
confirmed by replacing the primary antibodies with preimmune rabbit
serum or normal rabbit immunoglobulin G (IgG). No specific
immunoreactivity was detected in such sections.
Computer image analysis
The images were directly captured through a digital CCD camera
(ProgRes 3012 PPC, Krontron Electronik Co., Encring, Germany) with a
PRI-Macintosh interface board attached to an operating light
microscope. Resolution was set at 998x774 pixel. The images were
subsequently transferred to a Power Macintosh 9500/120 personal
computer-controlled operating system and processed with Macintosh
software Adobe Photoshop 3.0J.
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Results
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Results are summarized in Table 1
.
11ßHSD2 immunoreactivity was present in the cytoplasm, while MR
immunoreactivity was detected predominantly in the cytoplasm with some
nuclear staining. MR and 11ßHSD2 immunoreactivity was focally
detected in the smooth muscle cells of arteries and veins in these
tissues. In kidney, both MR and 11ßHSD2 immunoreactivity were present
in the same cells of distal convoluted tubules, thin and thick branches
of Henles loop, and collecting tubules. MR and 11ßHSD2 proteins
were not expressed in glomerulus and proximal convoluted tubules. In
colon, both MR and 11ßHSD2 proteins were expressed in the same
absorptive epithelial cells. In duodenum, jejunum, and ileum, focal
immunoreactivity of both MR and 11ßHSD2 were detected in superficial
epithelial columnar cells.
In salivary glands including submandibular and parotid glands,
11ßHSD2 and MR immunoreactivity was detected in striated ducts (Fig. 1
, A and B). MR immunoreactivity was
detected in some of these ductal cells in which 11ßHSD2
immunoreactivity was not observed. In stomach, MR and 11ßHSD2 were
not present in columnar epithelial cells, but focal immunoreactivity of
MR and 11ßHSD2 was detected in the gastric nongoblet epithelial cells
undergoing intestinal metaplasia. In both esophagus and anus, neither
MR nor 11ßHSD2 immunoreactivity was present in the squamous
epithelia, but both were expressed in the same excretory ductal cells
of both submucosal esophageal and anal glands. In the pancreas, the
same cells of small ducts connecting acinar cells with intercalated
ducts were immunohistochemically positive for both enzyme and MR,
although some ductal cells expressed only MR immunoreactivity, as in
the salivary gland.

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Figure 1. Immunohistochemical localization of 11ßHSD2 (A)
and MR (B) in submandibular glands. Immunoreactivity was detected in
striated ductal cells (x200, methyl green as nuclear stain).
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In the respiratory tract, 11ßHSD2 and MR colocalized in collecting
ducts of bronchial and tracheal submucosal glands (Fig. 2
, A and B), whereas acinar cells of
these glands were immunohistochemically negative for 11ßHSD2 and MR.
Ciliated ductal cells of these glands demonstrated relatively weak MR
immunoreactivity but were immunohistochemically negative for 11ßHSD2
(Fig. 2
, A and B). Bronchial ciliated epithelial cells also
demonstrated MR and 11ßHSD2 immunoreactivity, especially those in
small bronchi without submucosal glands and cartilage (Fig. 3
, A and B). In alveoli, type II alveolar
epithelial cells showed both MR and 11ßHSD2 immunoreactivity.

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Figure 2. Immunohistochemical localization of 11ßHSD2 (A)
and MR (B) in collecting duct of submucosal bronchial glands. Marked
immunoreactivity was detected in collecting duct cells. Sporadic
immunoreactivity of MR was also detected in ciliated bronchial
epithelial cells (x200, methyl green as nuclear stain).
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Figure 3. Immunohistochemical localization of 11ßHSD2 (A)
and MR (B) in ciliated bronchial epithelial cells. Both 11ßHSD2 and
MR were expressed in these cells (x200, hematoxylin as nuclear
stain).
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In skin, both 11ßHSD2 and MR proteins were present in eccrine sweat
glands, with neither expressed in apocrine or sebaceous glands. In
eccrine sweat glands, MR and 11ßHSD2 were immunolocalized in the
excretory ducts, but to different cells, with MR immunoreactivity found
in the basal cells of the duct and 11ßHSD2 immunoreactivity in the
luminal cells (Fig. 4
, A and B). Neither
MR nor 11ßHSD2 proteins were expressed in lacrimal gland, prostate,
bile duct, gall bladder, urinary bladder, urethra, or ureter.

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Figure 4. Immunohistochemical localization of 11ßHSD2 (A)
and MR (B) in eccrine sweat glands. 11ßHSD2 immunoreactivity was
detected in the luminal cells of the excretory ducts, while MR
immunoreactivity was detected in the basal cells (x400, methyl green
as nuclear stain).
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Discussion
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In this study we have established the cellular localization of
both MR and 11ßHSD2 proteins in tissues involved in ion and/or water
transport including classical and nonclassical mineralocorticoid target
tissues. Both 11ßHSD2 and MR are expressed in the same cells, with
few exceptions, in a wide variety of exocrine cells in man. These
findings confirm the importance of 11ßHSD2 in regulating systemic
mineralocorticoid action in man. Immunolocalization of MR and 11ßHSD2
in kidney and in the gastrointestinal tract is consistent with previous
findings (11, 12, 13, 15, 16, 18). Immunolocalization of MR and 11ßHSD2
in salivary glands and pancreas has also been previously reported (11, 15), and the results of our present study are generally consistent with
these findings. MR and 11ßHSD2 have not been reported in excretory
ducts of the submucosal glands of the anus and esophagus, but as in
salivary glands and pancreas, aldosterone may act on these cells and
modify serous secretory products.
An important observation in our present study was the presence of MR
and 11ßHSD2 immunoreactivity in ciliated epithelial cells of the
bronchus and type II alveolar epithelial cells. The presence of MR and
11ßHSD2 has not been directly demonstrated in the respiratory system
except for in situ hybridization in fetal rat lung (20).
However, Pagé et al. demonstrated 11ßHSD2 activity
in human lung cells (21), and Krozowski and Funder previously reported
the presence of mineralocorticoid receptor in the rat lung (22). It is
well-known that a significant fraction of the osmotically driven water
transport in the lung across alveolar and airway epithelium involves
transcellular movement facilitated by plasma membrane water channels
(23). In addition, the basal rates of sodium and fluid transport in
alveoli depend on sodium uptake by channels on the apical membrane of
alveolar type II cells followed by extrusion of sodium on the
basolateral surface by Na K-ATPase (23). Cullen and Welsh also reported
that Na+ absorption is both acutely and chronically
regulated by mineralocorticoids in the canine tracheal epithelium (24).
These findings, together with our present immunolocalization of MR and
11ßHSD2 in human respiratory tract, suggest that aldosterone also
plays important roles in sodium transportation across alveolar,
bronchial, and tracheal epithelium. In addition to these epithelia, MR
and 11ßHSD2 are expressed in the collecting duct of submucosal glands
in trachea and bronchus. Secretion from these submucosal glands
contributes to maintaining a mucous layer over the entire surface of
the respiratory tract. A mixture of serous and mucous secretions from
these glands regulates the viscosity of secretion, such as sputum.
Therefore, aldosterone can also contribute to regulation of viscosity
in the respiratory tract through its actions on collecting ductal
cells. The present study thus paves the way for further important
investigations to examine the involvement of aldosterone in various
pathological conditions of the human respiratory tract, including
bronchial asthma, pulmonary edema, and others.
In the skin, both MR and 11ßHSD2 proteins are present in eccrine
sweat glands, but not in the sebaceous and apocrine sweat glands. This
finding suggests that aldosterone may modulate perspiration through
eccrine sweat glands (15, 19). MR and 11ßHSD2 proteins are generally
colocalized in the same cells, although some ductal cells expressed MR
but not 11ßHSD2 immunoreactivity in the salivary glands, pancreas,
and bronchial and tracheal submucosal glands. However, distinctive
dissociation of MR and 11ßHSD2 expression was detected in the
excretory ductal cells of eccrine sweat glands, i.e. MR was
immunolocalized in the basal cells of the duct, while 11ßHSD2
immunoreactivity was found in the luminal cells. Little is known about
aldosterone modulation of sweat gland secretion in the human skin, and
further investigations are required to clarify the significance of the
differential immunolocalization of MR and 11ßHSD2. MR and 11ßHSD2
were not present in the tissues primarily involved in mucous secretion
including apocrine glands, sebaceous glands, prostate, and others. We
could not detect MR and 11ßHSD2 in human prostate, but Pagé
et al. demonstrated the presence of functional MR and
11ßHSD2 activity in human prostate cancer cell line LNCaP (25). It
awaits further investigations to clarify these differences. Aldosterone
may therefore be considered to be involved in modulating systemic
serous but not mucous secretion and/or ion transport in man.
Received May 6, 1997.
Revised July 28, 1997.
Accepted July 29, 1997.
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