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Primes Sensory Nerve Endings in a Pulmonary Hypersensitivity Reaction
Department of Pharmacology and Pathophysiology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| Abstract |
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is a cytokine associated with inflammatory diseases,
including asthma. Increased levels of TNF-
were found in the
bronchoalveolar lavage fluid of mice undergoing a dinitrofluorobenzene
(DNFB)-induced non-IgE-mediated pulmonary hypersensitivity reaction. We
report in this work that TNF-
increases the susceptibility of
sensory neurons to dinitrobenzene sulfonic acid (DNS) and capsaicin,
leading to a tracheal vascular hyperpermeability response in
DNFB-sensitized and DNS-challenged mice. mAb against TNF-
or the
TNFR1 inhibited this hyperpermeability response in DNFB-sensitized and
DNS-challenged mice. Furthermore, the hyperpermeability response after
DNS challenge was abolished in DNFB-sensitized mast cell-deficient
WBB6F1-W/WV mice. These
animals showed a remarked decrease of TNF-
bronchoalveolar lavage
fluid levels after a single DNS challenge. The hyperpermeability
response after DNS challenge was regained in mast cell-deficient mice
after mast cell reconstitution. These findings indicate a prominent
role for TNF-
and its TNFR1 in the DNFB-induced tracheal
hyperpermeability response. We propose that a priming effect of mast
cell-derived TNF-
on the sensory neurons could be the mechanism of
action of TNF-
in the vascular hyperpermeability response in
tracheas of mice undergoing a pulmonary hypersensitivity
reaction. | Introduction |
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TNF-
is a potent mediator associated with immunoregulation and
inflammatory conditions such as asthma. In vivo application of TNF-
leads to bronchial hyperresponsiveness (4), neutrophilic
inflammation in the airway (5), and increased pain
perception in rats (6, 7). Furthermore, TNF-
is
involved in alteration of the vascular permeability
(8, 9, 10). In asthmatics, TNF-
levels are increased in
sputum of symptomatic patients when compared with asymptomatic patients
(11). The sources of TNF-
include various cell types,
such as mast cells, macrophages, monocytes, and neutrophils
(11, 12, 13, 14). TNF-
acts through activation of two
receptors: a 55-kDa (p55) form designated TNFR1 and a 75-kDa (p75) form
designated TNFR2. Both TNFR1 and TNFR2 could be detected in human lung
tissue (15, 16). TNFR1 is found mainly on alveolar
macrophages, bronchioles, and small blood vessels, while TNFR2 was
detectable only in alveolar macrophages (16). Also, on
sensory neurons both TNFR1 and TNFR2 can be detected (17, 18).
Mice skin-sensitized with the low-m.w. hapten dinitrofluorobenzene (DNFB)2 and intra-airway-challenged with the water-soluble form of the hapten, dinitrobenzene sulfonic acid (DNS), develop a hypersensitivity reaction in the airways (19, 20). Features of the pulmonary hypersensitivity reaction in mice include acute bronchoconstriction, mast cell activation, tracheal hyperreactivity, leukocyte infiltration in the lungs, and increased mucosal exudation in the alveolar lumen 2448 h after challenge (19, 20). Van Loveren and colleagues (21, 22, 23) originally described the pulmonary reaction as a delayed-type hypersensitivity. However, we have shown that mast cells are activated shortly after challenge (24).
In previous experiments we have shown that a profound increase in tracheal vascular permeability can be detected after a second DNS challenge to DNFB-sensitized mice (25). Replacement of the second DNS challenge by capsaicin could mimic the tracheal vascular permeability response, indicating a possible role for sensory neurons and sensory neuropeptides in the tracheal hyperpermeability response in DNFB-sensitized mice (25). This finding was confirmed by tachykinin NK1 receptor blockade. The tachykinin NK1 receptor antagonist, RP67580, inhibited the tracheal vascular permeability response to a repeated DNS challenge in DNFB-sensitized mice (25).
It is known that TNF-
can modulate the susceptibility of neurons. In
isolated human bronchial tissue, TNF-
increased the responsiveness
to electric field stimulation (26). Moreover, in vitro
incubation of rat sensory nerves with TNF-
enhanced the sensitivity
of the neurons to capsaicin-induced excitation (27).
Therefore, TNF-
could be involved in priming sensory nerve endings
in the DNFB-induced tracheal hyperpermeability response to repeated DNS
challenge.
To establish the role of TNF-
in the pulmonary DNFB-induced
hypersensitivity reaction, the amount of TNF-
present in the
bronchoalveolar lavage (BAL) fluid of DNFB-sensitized mice was
determined on different time points after DNS challenge and compared
with vehicle-sensitized animals. To investigate the ability of TNF-
to prime sensory nerve endings we followed two approaches. First, the
role of TNF-
and its receptors in the tracheal hyperpermeability
response in DNFB-sensitized mice was examined by the use of a
neutralizing mAb against TNF-
and two TNFR mAb. Second, we
investigated whether exogenous TNF-
sensitizes sensory nerve endings
in naive mice, thereby enhancing capsaicin-induced tracheal vascular
permeability. To determine whether mast cells could be the source of
TNF-
, mast cell-deficient
WBB6F1-W/WV mice
were used prior to and after reconstitution with bone marrow-derived
mast cells (BMMCs) from WBB6F1-+/+ mice.
| Materials and Methods |
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Male BALB/c mice were supplied by the Central Animal Laboratory (GDL, Utrecht University, Utrecht, The Netherlands). Mast cell-deficient (WBB6F1-W/WV) mice and the respective normal littermates (WBB6F1-+/+) were purchased from The Jackson Laboratory (Bar Harbor, ME). All mice had free access to tap water and chow food. Age-matched animals were used in all individual experiments. All experiments were conducted in accordance with the Animal Care Committee of Utrecht University.
Mast cell reconstitution
BMMCs were obtained and cultured from +/+ mice as described by Karimi et al. (28). Briefly, bone marrow was aseptically flushed from femurs and cultured in complete RPMI (RPMI 1640 medium, which contained 4 mM L-glutamine, 0.5 µM 2-ME, 1 mM sodium pyruvate, 100 U/ml penicillin, 100 mg/ml streptomycin, and 0.1 mM nonessential amino acids) supplemented with supernatant from a 7-day culture of PWM-stimulated splenocytes (20% v/v). Medium was refreshed once a week. Mast cell-deficient W/WV mice were infused via the tail vein with 2.5 x 106 cultured BMMCs from +/+ mice, and the recipients were studied 20 wk later.
Sensitization and experimental procedure
Skin sensitization was accomplished by 0.5% DNFB (Sigma-Aldrich, Axel, The Netherlands) dissolved in a mixture of acetone and olive oil (4/1). On day 0, DNFB or vehicle was applied onto the shaved abdomen (50 µl) and paws (50 µl). On day 1, DNFB or vehicle was only applied onto the abdomen (50 µl). On day 5, the animals were anesthetized with pentobarbitone (40 mg/kg i.p.) and intranasally (i.n.) challenged with DNS (6 mg/ml in 50 µl PBS; Sigma-Aldrich). Thirty minutes before the animals were killed on day 6, a second challenge with DNS, capsaicin (10-10 M per mouse, 50 µl; Fluka, Buchs, Switzerland) or PBS (50 µl) was applied and changes in tracheal vascular permeability were determined. A previous study showed that the applied dosage of capsaicin itself had no influence on the tracheal vascular permeability (25).
Neutralizing anti-TNF-
mAb (XT22 hybridoma cell line, 1
mg/mouse) or control (rat IgG, 1 mg/mouse; R&D Systems, Minneapolis,
MN) were administered i.v. 1 h before the first DNS challenge. In
separate series of experiments, anti-TNFR1 or anti-TNFR2 mAb
(both 50 µg/mouse) or control (normal hamster serum; GDL) also
were injected i.v. 1 h before the first DNS challenge. These two
receptor Abs were purchased from Genzyme (Rüsselsheim, Germany)
and have been extensively characterized (29, 30).
Intranasal treatment with TNF-
to naive or DNFB-sensitized mice
Anesthetized mice received i.n. different dosages of TNF-
(0.25250 pg/mouse; PeproTech, Rocky Hill, NJ) or PBS in a volume of
50 µl. Twenty-four hours after the administration of TNF-
or PBS,
animals were exposed i.n. to PBS, capsaicin
(10-10 M per mouse), or different dosages of
substance P (10-1210-10
M per mouse; Calbiochem-Novabiochem, Lufelfingen, Switzerland). Thirty
minutes after the i.n. administration of capsaicin, the mice were
killed by pentobarbitone (60 mg/ml, 200 µl i.p.). According to our
findings on substance P-induced leakage (25), the animals
were killed after 15 min of exposure to substance P.
In a separate series of experiments TNF-
was administered i.n. to
DNFB-sensitized animals to investigate whether exogenous TNF-
could
mimic the effect of the first challenge. Therefore, TNF-
(25 pg per
mouse) or PBS was applied i.n. to anesthetized DNFB-sensitized mice on
day 5, replacing the first DNS challenge. PBS, DNS, or capsaicin was
administered i.n. on day 6 to these mice. The animals were examined 30
min later.
Measurement of hyperpermeability
To assess changes in tracheal vascular permeability, Evans blue (1.25% in sterile saline, 50 µl; Sigma-Aldrich) was injected i.v. to anesthetized animals (pentobarbitone, 50 mg/kg i.p.). Evans blue dye binds to plasma proteins and quantification of the extracted dye from tracheal tissue provides a measurement of tracheal permeability changes (31, 32). The dye was injected 2 h before the animals were killed. Shortly before the mice died, heparin was administered i.v. (10 U/ml blood) and blood samples were taken. The animal was perfused via the right ventricle with 10 ml warm saline (37°C). Blood and perfusion fluid were expelled through an incision in the vena cava. Thereafter, the trachea was removed from the animal, dissected free of fat and connective tissue, and placed into formamide (250 µl). Evans blue dye was extracted from the tracheas overnight at 40°C. Tracheas were dried for 3 days at 40°C and tracheal dry weight was determined. The amount of Evans blue in the plasma samples and formamide extracts was quantified by measuring the OD at a wavelength of 595 nm with a Benchmark microplate reader (Bio-Rad, Hercules, CA). The amount of Evans blue present in the trachea was calculated by dividing OD value of the formamide sample (corrected for the volume) by the OD value of the plasma sample. Changes in tracheal vascular permeability were expressed as microliters of leakage per milligram of tracheal dry weight.
Measurement of TNF-
in BAL fluid
In separate series of experiments, BAL fluid was taken from
vehicle-sensitized or DNFB-sensitized animals on different time points
after the DNS challenge on day 5 and 30 min after the second challenge
on day 6. At the time of the lavage, mice were killed and the chest
cavity was exposed to allow expansion. The trachea was carefully
intubated and the catheter was secured with ligatures. Warm saline
(37°C, 1 ml) was slowly injected in the lungs and withdrawn. The
concentration of TNF-
in BAL fluid was measured via a murine TNF-
ELISA kit (BioSource, Nivelles, Belgium).
Statistical analysis
The results are expressed as mean ± SEM. Differences between the groups were analyzed by a Students t test or ANOVA. If appropriate, the ANOVA was followed by the Bonferronis multiple comparison test (GraphPad Prism version 2.01; GraphPad, San Diego, CA). All p values <0.05 were considered to reflect a statistically significant difference.
| Results |
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levels in the BAL fluid of mice undergoing a DNFB-induced
pulmonary hypersensitivity reaction
TNF-
was detectable in the BAL fluid of both vehicle- and
DNFB-sensitized mice (Table I
). Thirty
minutes after a challenge with DNS, the levels of TNF-
in the BAL
fluid of DNFB-sensitized animals were increased when compared with
vehicle-sensitized animals. The amount of TNF-
in DNFB-sensitized
animals declined at 6 h to control level.
|
pretreatment on the vascular
hyperpermeability found in mice undergoing a DNFB-induced pulmonary
hypersensitivity reaction
Because the amount of TNF-
was increased dramatically after the
first DNS challenge, anti-TNF-
mAb was administered before the
first DNS challenge on day 5. A second challenge with DNS enhanced the
tracheal vascular permeability in DNFB-sensitized and DNS-challenged
mice treated with control Ab (Fig. 1
A). This increased response
to a second challenge with DNS could be inhibited with the
anti-TNF-
mAb given 1 h before the first DNS challenge on
day 5 (Fig. 1
A). In addition, capsaicin exposure to
DNFB-sensitized and single DNS-challenged mice increased the tracheal
vascular permeability mice treated with control Ab (Fig. 1
B). This increased response to capsaicin could also be
inhibited with the anti-TNF-
mAb (Fig. 1
B).
|
TNF-
elicits its effects via binding to two TNFRs, TNFR1 and
TNFR2. The effect of anti-TNFR1 and anti-TNFR2 mAb treatment on
DNFB-induced tracheal vascular hyperpermeability response after
a repeated DNS challenge or DNS/capsaicin-challenge is also depicted in
Fig. 1
. Anti-TNFR1 or anti-TNFR2 itself had no influence on basal
tracheal vascular permeability. Anti-TNFR1, but not anti-TNFR2
pretreatment, inhibited the hyperpermeability response to a second DNS
challenge (Fig. 1
, C and D). Moreover, an i.n.
application of capsaicin, instead of the second DNS challenge, enhanced
the tracheal vascular permeability in DNFB-sensitized and single
DNS-challenged mice. This increased response to capsaicin could also be
blocked by anti-TNFR1 (Fig. 1
E) but not with
anti-TNFR2 pretreatment (Fig. 1
F).
Priming effect of TNF-
on capsaicin- or DNS-induced tracheal
vascular permeability changes
Twenty-four hours after the administration of TNF-
, an
increased vascular permeability response to capsaicin
(10-10 M per mouse) was observed in tracheas of
naive mice (Fig. 2
). This TNF-
-induced
hyperpermeability response was dose dependent. Treatment with TNF-
or capsaicin alone had no influence on basal tracheal vascular
permeability in naive mice. The influence of TNF-
on the tracheal
vascular permeability induced by substance P is depicted in Table II
. With increasing dosages, substance P
itself induced an enhancement of the tracheal vascular permeability in
a dose-dependent manner. No additive response to substance P could be
found after TNF-
pretreatment.
|
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is responsible for the hyperpermeability
response in DNFB-sensitized mice, the first DNS challenge on day 5 was
replaced by TNF-
or PBS. On day 6, these mice were challenged with
DNS, capsaicin, or PBS. In DNFB-sensitized mice, TNF-
elicited a
tracheal hyperpermeability response to both DNS and capsaicin compared
with DNFB-sensitized TNF-
-treated and PBS-challenged mice (Fig. 3
itself had no influence on
the tracheal vascular permeability.
|
To investigate whether mast cells are involved in the tracheal
vascular hyperpermeability response to a repeated DNS challenge, mast
cell-deficient W/WV and their congenic
normal (+/+) mice were used. In DNFB-sensitized +/+ mice, a second DNS
challenge increased the tracheal vascular permeability, as depicted in
Fig. 4
. However, in mast cell-deficient
W/WV mice the hyperpermeability to a
second DNS challenge was not observed (Fig. 4
A).
The tracheal hyperpermeability response to a repeated DNS
challenge was regained after mast cell reconstitution in
DNFB-sensitized W/WV mice when compared
with their age-matched +/+ mice (Fig. 4
B).
|
levels in the BAL fluid of DNFB-sensitized mast
cell-deficient mice after single DNS challenge
Because TNF-
appears to increase directly upon the first DNS
challenge (Table I
) in DNFB-sensitized BALB/c mice, TNF-
BAL fluid
levels were measured 30 min after a single DNS challenge in mast
cell-deficient DNFB-sensitized W/WV mice
and their congenic littermates (+/+). Increased TNF-
BAL fluid
levels were found 30 min after the first DNS challenge in
DNFB-sensitized BALB/c and DNFB-sensitized +/+ animals (Fig. 5
) compared with vehicle-sensitized
BALB/c or vehicle-sensitized +/+ mice. However, no difference in
TNF-
levels in the BAL fluid was found after DNS challenge in
DNFB-sensitized W/WV mice compared with
vehicle-sensitized mice (Fig. 5
).
|
| Discussion |
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is able to increase the
susceptibility of the sensory nerve endings for excitatory stimuli,
such as capsaicin, in a non-IgE-mediated pulmonary hypersensitivity
reaction. The enhanced susceptibility leads to a tracheal vascular
hyperpermeability response as a result of a repeated DNS challenge in
DNFB-sensitized mice. This effect of TNF-
on the sensory nerves is
mast cell dependent and TNFR1 mediated.
TNF-
is believed to play a role in the pathogenesis of asthma in
humans and in animal models for asthma (33, 34, 35). In the
present study, we have found increased amounts of TNF-
in the BAL
fluid of DNFB-sensitized mice after a first challenge with DNS. In
vehicle-sensitized mice, a small increase in TNF-
BAL levels was
also observed 6 h after the first DNS challenge when compared with
nonchallenged animals. This was probably due to the irritant effect
of DNS.
TNF-
can be released from several cell types, including activated
mast cells (13), macrophages (36), and
monocytes (14). Appearance of TNF-
in the BAL
fluid directly after the first challenge suggests that TNF-
is
released by cells that contain prestored TNF-
. This includes
tissue-resident inflammatory cells like mast cells and macrophages in
the hyperpermeability response in DNFB-sensitized animals.
DNFB-sensitized W/WV mice showed no
increase in TNF-
levels in their BAL fluid 30 min after the first
DNS challenge compared with their congenic littermates (+/+) or BALB/c
mice. Furthermore, in DNFB-sensitized mast cell-deficient
W/WV mice the hyperpermeability response
to a repeated DNS challenge was absent while reconstitution of mast
cells regained this response. Altogether, mast cells play a key role in
the release of TNF-
in mice undergoing a pulmonary hypersensitivity
reaction.
The biological effects of TNF-
are elicited by two distinct TNFRs.
TNFR1 has been associated with inflammation (37),
neutrophilic infiltration (38), and apoptosis
(39). TNFR2 seems to play a role in cell proliferation
(40) and initiation of cutaneous immune response
(41). We have found that anti-TNFR1 mAb treatment
administered 1 h before the first DNS challenge inhibited
hyperpermeability responses in the trachea of DNFB-sensitized and
repeatedly DNS-challenged mice. This finding is in accordance
with studies on inflammatory conditions such as hyperalgesia and skin
necrosis (30, 42). Besides an anti-TNF-
receptor Ab
treatment, the influence of both receptors on the hyperpermeability
response could be examined by TNFR1 and/or TNFR2 knockout mice.
However, this will not give a definite answer on the TNFR1 involvement
in this study, because both receptors are already involved in the
sensitization phase of a hypersensitivity reaction (41, 43). Although both receptor types are widely expressed
(including different cell lines and lung tissues), not much is known
about the presence of TNFR1 and TNFR2 on sensory nerve endings. A
recent study showed that dorsal root ganglions contain both TNFR1 and
TNFR2 (17, 18). The expression of both receptor subtypes
was enhanced after exogenous TNF-
or chronic constriction injury of
the nerve, which is a model for inflammatory neuropathy
(17).
It is known that TNF-
is able to modulate the sensory nerve endings
in vivo. The responses of TNF-
associated with inflammation included
an enhanced sensitivity to painful stimuli, a condition known as
hyperalgesia. Administered systemically or intradermally, TNF-
induces a hyperalgesic state, presumably by an action at the peripheral
terminals, leading to decreased thresholds required for stimulation of
C-fibers (6, 7). Similar findings have been observed in
the airways, where TNF-
facilitated the capsaicin-induced calcitonin
gene-related peptide release in rat tracheas (44). Our
findings also demonstrate that TNF-
is able to increase the
sensitivity of sensory neurons to neurogenic stimuli in DNFB-sensitized
mice. In naive mice, TNF-
only enhanced the capsaicin-induced
permeability in contrast to substance P-induced permeability response.
This leads to the conclusion that TNF-
acts specifically on the
sensory nerve ending and not at the tachykinin receptor level.
This finding of an increased susceptibility to excitatory agents after
TNF-
application is also demonstrated in cell cultures
(44). Pretreatment with TNF-
not only increased the
number of cobalt-labeled neurons in rat dorsal root ganglia cultures
but also enhanced the peak amplitude of the capsaicin-evoked inward
current (27). Furthermore, in single nociceptive primary
afferent fibers of anesthetized rats application of low concentrations
of TNF-
increased the axonal activity of the fibers
(45).
The precise mechanism by which TNF-
influences the susceptibility of
the sensory nerves for excitatory stimuli is unknown. It is possible
that TNF-
increase the susceptibility directly by binding to its
TNFR1 on the sensory neuron. This will result in mitogen-activated
protein kinase and c-Jun N-terminal kinase and mobilization of calcium
ions from intracellular stores (18). It is possible that
the enhanced mobilization of calcium is linked to the sensitivity of
the neuron for neurogenic stimuli. TNF-
can also be taken up by the
nerve and transported to the ganglion, where it may modify protein and
neuropeptide expression in the sensory neuron (17). A
third mechanism for the increased sensitivity of the sensory neuron by
TNF-
is via the production of other inflammatory mediators, such as
nerve growth factor or PGs via binding and activation of the TNFR1. In
fibroblasts, TNF-
stimulated the production of nerve growth factor
via the TNFR1 (46). During peripheral inflammation, nerve
growth factor increased the sensitivity of dorsal root ganglia
(47). In addition, PGs are able to increase the
susceptibility of sensory neurons to capsaicin (27, 48).
In summary, we propose that mast cells of DNFB-sensitized mice will
release TNF-
upon the DNS challenge. This process will then increase
the sensitivity of sensory nerve ending at the time of the second
challenge, resulting in a tracheal hyperpermeability response. It can
be concluded that mast cell-derived TNF-
and its TNFR1 play a
prominent role in priming of the sensory nerve endings in airways of
mice undergoing a hypersensitivity reaction.
| Acknowledgments |
|---|
mAbs
(XT22) were generously provided by Dr. R. L. Coffman (Department
of Immunology, DNAX Research Institute, Palo Alto, CA). | Footnotes |
|---|
2 Abbreviations used in this paper: DNFB, dinitrofluorobenzene; BMMC, bone marrow-derived mast cell; BAL, bronchoalveolar lavage; i.n., intranasal(ly); DNS, dinitrobenzene sulfonic acid. ![]()
Received for publication December 13, 2001. Accepted for publication March 7, 2002.
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