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Infection and Immunity, January 2005, p. 661-665, Vol. 73, No. 1
0019-9567/05/$08.00+0 doi:10.1128/IAI.73.1.661-665.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Tissue Inhibitor of Metalloproteinase 1 Regulates Resistance to Infection
Marie Mei Lee,1,
Bong-June Yoon,1
Keith Osiewicz,1
Michael Preston,2
Brian Bundy,1
Anna M. van Heeckeren,3
Zena Werb,4 and
Paul D. Soloway1,5*
Roswell Park Cancer Institute, Buffalo,1
Division of Nutritional Sciences, Cornell University, Ithaca, New York,5
Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts,2
Department of Pediatrics, Case Western Reserve University School of Medicine, Cleveland, Ohio,3
Department of Anatomy, University of California, San Francisco, California4
Received 21 July 2004/
Returned for modification 27 August 2004/
Accepted 24 September 2004

ABSTRACT
Tissue inhibitor of metalloproteinase 1 (TIMP-1)-deficient mice
are resistant to
Pseudomonas aeruginosa corneal infections.
Corneas healed completely in TIMP-1-deficient mice, and infections
were cleared faster in TIMP-1-deficient mice than in wild-type
littermates. Genetic suppression studies using matrix metalloproteinase
(MMP)-deficient mice showed that MMP-9, MMP-3, and MMP-7 but
not MMP-2 or MMP-12 are needed for resistance. Increased resistance
was also seen during pulmonary infections. These results identify
a novel pathway regulating infection resistance.

TEXT
Twenty-five matrix metalloproteinases (MMPs) comprise the major
extracellular matrix-degrading activities in mammals. They can
remodel matrix during development, tumor metastasis, and cell
migration but have nonmatrix substrates as well. MMPs are inhibited
posttranslationally by four tissue inhibitors of metalloproteinases
(TIMP-1, TIMP-2, TIMP-3, and TIMP-4) and by
2-macroglobulin
(
33).
Many correlative studies have suggested that MMP production was associated with inflammation and that MMP inhibition had an anti-inflammatory effect (3-5, 21, 26, 29). More recently, studies with MMP mutant mice have confirmed that MMPs play an important role in promoting inflammation and immunity: overexpression of MMP-1 in lungs promotes a spontaneous emphysema-like response (6), MMP-12 loss attenuates macrophage migration and lung damage caused by cigarette smoke (27), MMP-7 participates in proteolytic activation of antibacterial defensins by epithelial cells (32) and chemoattraction of inflammatory cells to the lung (16), and MMP-3 loss diminishes T-cell-dependent delayed type hypersensitivity responses, while the loss of MMP-9 delays the resolution of those responses (30). TIMP expression has also been associated with a variety of infectious and noninfectious inflammatory conditions, including those affecting the eye (12, 14, 34), and TIMP-3 regulates tumor necrosis factor alpha (TNF-
) production (18). Collectively, these data highlight varied and complex roles for components of the TIMP-MMP axis during immune and inflammatory responses; however, TIMPs have not been directly shown to regulate responses to infection. To study the role of TIMP-1 in inflammation and immunity and its possible involvement in other physiological processes, mice deficient in TIMP-1 were generated and evaluated for responses during corneal and pulmonary infections with Pseudomonas aeruginosa.
Preparation of Timp1 mutant mice.
A replacement vector (Fig. 1A) targeted to the Timp1 locus in embryonic stem (ES) cells (Fig. 1B) produced a null allele in mice (Fig. 1C). The replacement vector included a 3.3-kb NdeI to HindIII 5' arm; a 21-mer oligonucleotide (5'-CTGATCAGCTGACTCGAGG-3') at an EcoRV site in the third coding exon that abolished the EcoRV site generating BamHI, BglII, and XhoI sites; a G418 drug resistance cassette at the XhoI site; and a TK marker. Electroporated ES clones were screened by Southern blot analysis with a 1,400-nucleotide HindIII-NdeI Timp1 5' fragment as a probe. Mutant mice were made by injecting blastocysts with targeted ES cells.
Increased infection resistance in Timp1 mutants.
TIMP-1 has been implicated in erythropoiesis (
9), wound healing
(
25), steroidogenesis (
2), and tumor metastasis. However, the
loss of TIMP-1 in mice caused no detectable changes in these
processes (
22,
28) or in kidney fibrosis (
8), but modest changes
were observed in corneal neovascularization (
35) and left ventricular
geometry (
24). However, TIMP-1-deficient mice had dramatically
improved bacterial clearance relative to wild-type mice after
induction of corneal infections with a human corneal isolate
of
P. aeruginosa (Fig.
2A). For corneal infections, we grew
nonmucoid
P. aeruginosa strain 6389 overnight on tryptic soy
agar plates prepared with Noble agar, collected bacteria in
sterile proteose peptone (2%), anesthetized mice with tribromoethanol,
made three 1-mm scratches with a 26-gauge needle, and placed
5 µl of bacteria (10
7 CFU) on the corneas. We measured
bacterial burdens several times within 5 days after infection
by plate count of whole eyes homogenized in 2% proteose peptone.
At 4 h after infection of strain 129S4/Jae mice, eyes from wild-type
and mutant animals had identical numbers of bacteria, indicating
that the initiation of the infection was not altered by the
Timp1 mutation. By 12 h after infection, when a burst of
P. aeruginosa replication had occurred, comparable numbers of bacteria
were recovered from mutant and wild-type eyes, indicating that
there was no intrinsic barrier to bacterial replication in mutant
mice. By 24 and 48 h after infection, when histological sections
revealed that neutrophil infiltration into infected corneas
had begun and then peaked, respectively (data not shown), there
were 2 to 3 orders of magnitude fewer viable bacteria in eyes
of mutant mice than in eyes of wild-type mice. Statistical analysis
of bacterial burden was done by analysis of variance (ANOVA).
Strain 129 mice recover completely from these infections and
are considered resistant. C57BL/6 mice can clear infections
too, but they undergo corneal perforation because of unresolved
inflammation and are considered infection sensitive (
23). By
16 days after infection, wild-type C57BL/6 mice maintained a
persistent inflammatory response and underwent perforation;
however, TIMP-1-deficient littermates resolved the inflammation
completely, and corneal integrity was restored (Fig.
2B). These
results, from two different measures, demonstrated dramatically
increased resistance to
P. aeruginosa corneal infection in TIMP-1-deficient
mice.
MMP-9, MMP-7, and MMP-3 are needed for infection resistance in Timp1 mutants.
To determine whether the increased resistance phenotype was
due to the loss of proteinase inhibitory activity in
Timp1/ mice, we repeated the corneal infections in 129S4/Jae mice that
were treated with BB-94, a synthetic metalloproteinase inhibitor
(
7). We first injected animals intraperitoneally with 40 mg
of BB-94 (British Biotech, Oxford, England)/kg of body weight
daily for 4 days prior to infection and on the day of infection
using suspension of BB-94 (3.0 mg/ml) in phosphate-buffered
saline (PBS) containing 0.01% Tween 40. Over 99% of the enhanced
bacterial clearance by mutant mice was suppressed by BB-94 treatment
(Table
1).
Because BB-94 inhibits MMPs as well as the non-MMP proteinase
tumor necrosis factor alpha-converting enzyme (TACE) that releases
membrane-bound TNF-

from the surfaces of cells (
1,
19), this
pharmacological approach did not identify the specific proteinases
influencing the infection phenotypes in
Timp1/ mice. However, because TIMP-1 is inactive against TACE (
15),
it was likely that that the
Timp1 mutant phenotype was mediated
most directly by an MMP. Nonetheless, to identify the proteinases
responsible for the
Timp1 mutant phenotype, we took a genetic
approach, reasoning that if one or more MMPs are required for
the mutant phenotype, then the increased resistance to infection
should be suppressed in mice harboring mutations in both
Timp1 and the critical proteinases. To perform this analysis, we bred
Timp1 mutants with animals carrying lesions in
Mmp2 (
11),
Mmp3 (
20),
Mmp7 (
31),
Mmp9 (
17), and
Mmp12 (
10). These animals were
available on either the C57BL/6 background or on different 129
backgrounds. Guided by the results shown in Fig.
2, the controls
and suppression tests used the assay appropriate for the specific
strain background: bacterial burden assays for strain 129 mice
and kinetics of corneal perforation for C57BL/6 mice. For each
cross, control infections were performed with wild-type progeny
and mice with only the
Timp1 mutation to verify that the
Timp1 mutant phenotype could be observed on these backgrounds. On
each strain background,
Timp1 mutants exhibited significantly
increased resistance to infection relative to the wild-type
controls, consistent with our earlier data with
Timp1/ mice that had not been crossed into
Mmp mutant backgrounds (Table
2, Fig.
3, and data not shown). In
Timp1 Mmp9 double mutants,
resistance to infection was indistinguishable from the corresponding
wild-type control animals but significantly lower than resistance
in the
Timp1 single mutants on the same background. This result
indicated that MMP-9 was essential for the
Timp1 phenotype (Table
2). In
Timp1 Mmp7 double mutants and
Timp1 Mmp3 double mutants,
resistance to infection was significantly higher than in the
strain-matched wild-type controls but significantly lower than
in the
Timp1 single mutant controls. This result indicated that
while these two MMPs also contributed to the
Timp1 mutant phenotype,
they were not by themselves responsible for all of the resistance
(Table
2 and Fig.
3). Suppression analysis using
Mmp2 and
Mmp12 mutants revealed that they do not contribute to the
Timp1/ phenotype (data not shown). Statistical analysis of corneal
perforation data was by log rank testing of all data points
in each experiment.
Enhanced resistance to pulmonary infections in Timp1 mutants.
To determine whether TIMP-1-deficient mice also showed enhanced
resistance to pulmonary infection, we grew
P. aeruginosa strain
M57-15 overnight in liquid tryptic soy broth and instilled 10
7 CFU in 25 µl of solution intratracheally into the right
lungs of anesthetized mice. This strain is a mucoid isolate
from the lungs of a cystic fibrosis patient. Our assays for
bacterial burden and gross appearance of histological sections
revealed no differences between
Timp1+/+ and
Timp1/ mice at several times after infection. However, survival of
mutant animals was significantly improved in TIMP-1-deficient
mice (
P = 0.008). This result demonstrated that increased resistance
to infection in
Timp1 mutants is not limited to the cornea (Fig.
4).
Loss of TIMP-1 in mice resulted in increased resistance to corneal
and pulmonary infection with
P. aeruginosa. Resistance to corneal
infection could be suppressed by BB-94, indicating that the
phenotype was reversible and due to the loss of the proteinase-inhibiting
activity of TIMP-1. The proteinases MMP-9, MMP-7, and MMP-3
are each important for resistance; however, the hierarchy of
their importance is unknown. Because BB-94 also inhibits TACE
(
1,
19), BB-94 suppression of the
Timp1/ phenotype
may involve effects mediated by TNF-

release. However, suppression
of the
Timp1 phenotype by loss of MMPs that do not process TNF-
indicates that TNF-

-mediated effects cannot explain the phenotype
of
Timp1 mutants. Furthermore, in animals with corneal infections,
no circulating TNF-

was detected by enzyme-linked immunosorbent
assay (data not shown); however, local production in the cornea
was not tested.
The targets of MMP-9, MMP-7, and MMP-3 that lead to improved resistance to infection in TIMP-1-deficient mice are unknown. It is also unknown whether a single common mechanism is affected in the corneal and pulmonary models. It is possible that dysregulated MMP proteolysis directly modifies innate immunity in Timp1 mutants. Consistent with this are data showing that MMP-7 cleaves mature defensins from precursors (32). Alternatively, innate immunity could be affected indirectly. For example, release of syndecan-1 from epithelial cells by MMP-7 has been shown to influence chemokine mobilization and epithelial transmigration of neutrophils (16). It is not likely that the loss of TIMP-1 affects the ability of infections to become established. During the first 12 h of corneal infections, bacteria adhered to and replicated in the infected corneas equally well in both mutant and wild-type mice (Fig. 2A). Furthermore, the resistance phenotype was not apparent until large numbers of inflammatory cells were recruited to infected eyes (data not shown).
In contrast to our results showing that the loss of TIMP-1 is protective against infections are studies showing that mice treated with anti-TIMP-1 rabbit serum apparently have increased susceptibility to infection relative to animals treated with normal rabbit serum (13). In those studies, it is possible that the formation of TIMP-1-containing immune complexes activated serum complement leading to its depletion. Increased susceptibility to infections in those animals could then be more influenced by complement depletion and have nothing to do with TIMP-1 depletion. Assays for serum complement or experiments using antibody against an irrelevant serum protein to control for this were not reported. Furthermore, it is not known whether TIMP-1 was actually depleted from mice or if a feedback mechanism increased local synthesis in critical anatomical sites under conditions of systemic TIMP-1 depletion. These caveats are not concerns with the null genetic alteration in Timp1 we report here.
Our results raise the possibility that TIMP-1 antagonists or MMP agonists may be of therapeutic benefit for augmenting resistance to P. aeruginosa. Such agents may be of greatest utility for individuals with unresolved, antibiotic-resistant pulmonary infections, such as cystic fibrosis patients.

ACKNOWLEDGMENTS
This work was supported by Public Health Service grants EY11279
and AI053194 from the National Institutes of Health.
We thank D. Oleszek and K. Somogyi for excellent technical help; Gerald B. Pier for helpful advice; and Steven Shapiro, John Mudgett, Shigeyoshi Itohara, and Lynn Matrisian for mice deficient in MMP-12, MMP-3, MMP-2, and MMP-7, respectively.

FOOTNOTES
* Corresponding author. Present address: Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853. Phone: (607) 254-6444. Fax: (607) 254-6444. E-mail:
pds28{at}cornell.edu.

Editor: F. C. Fang
Present address: University of California, San Francisco, CA 94122. 

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Infection and Immunity, January 2005, p. 661-665, Vol. 73, No. 1
0019-9567/05/$08.00+0 doi:10.1128/IAI.73.1.661-665.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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