 2-Adrenergic
Receptor on the Response to Regular Use of
Albuterol in Asthma
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ABSTRACT |
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TOP
ABSTRACT
INTRODUCTION
METHODS
RESULTS
DISCUSSION
REFERENCES
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Inhaled 
-adrenergic agonists are the most commonly used medications for the treatment of asthma although there is evidence that regular use may produce adverse effects in some patients. Polymorphisms of the 2-adrenergic receptor (2-AR) can affect regulation of the receptor. Smaller studies examining the effects of such polymorphisms on the response to -agonist therapy have produced inconsistent results. We examined whether polymorphisms at codon 16 (2-AR-16) and codon 27 (2-AR-27) of the 2-AR might affect the response to regular versus as-needed use of albuterol by genotyping the 190 asthmatics who had participated in
a trial examining the effects of regular versus as needed albuterol
use. During the 16-wk treatment period there was a small decline
in morning peak expiratory flow in patients homozygous for arginine at B2-AR-16 (Arg/Arg) who used albuterol regularly. This effect was magnified during a 4-wk run out period, during which all
patients returned to using as-needed albuterol, so that by the end
of the study Arg Arg patients who had regularly used albuterol
had a morning peak expiratory flow 30. 5 ± 12.1 L/min lower (p = 0.012) than Arg/Arg patients who had used albuterol on an as
needed basis. There was no decline in peak flow with regular use
of albuterol in patients who were homozygous for glycine at 2-AR-16. Evening peak expiratory flow also declined in the Arg/Arg
patients who used albuterol regularly but not in those who used
albuterol on an as-needed basis. No significant differences in outcomes between regular and as-needed treatment were associated
with polymorphisms at position 27 of the 2-AR. No other differences in asthma outcomes that we investigated occurred in relation to these 2-AR polymorphisms. Polymorphisms of the 2-AR
may influence airway responses to regular inhaled -agonist treatment.
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INTRODUCTION |
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TOP
ABSTRACT
INTRODUCTION
METHODS
RESULTS
DISCUSSION
REFERENCES
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Inhaled selective 2-agonists with an intermediate duration of
action are the most commonly prescribed asthma medications in the world (1). Treatment of asthma by inhalation of agents such as albuterol, isoetharine, metaproterenol, pirbuterol, and terbutaline provides immediate and effective reversal of airway obstruction, with marked improvement in symptoms.
Over the past several years, there has been considerable controversy about the role of inhaled -agonists in the treatment
of asthma (2). Specifically, it has been suggested that the
regularly scheduled use of inhaled -agonists is associated
with a deleterious effect on asthma control.
We recently addressed this issue in patients with mild asthma by comparing, in a multicenter, placebo-controlled double-blind trial, asthma control in two cohorts, each of more than 125 patients (8). One cohort was treated with inhaled albuterol on a regularly scheduled basis, two puffs four times a day; the other was treated with an identical appearing inhaled placebo given on the same schedule. We found no clinically significant differences in overall asthma control between the two groups as a whole, despite the fact that the group allocated to regularly scheduled albuterol treatment used, on average, 7.2 puffs a day of inhaled albuterol whereas the as-needed only treatment group used only approximately 11/4 puffs per day. We concluded that, in patients with mild asthma, the regularly scheduled use of inhaled albuterol was not associated with either beneficial or deleterious effects.
While the above trial was in progress a number of polymorphisms of the 2-adrenergic receptor (2-AR) were identified
(9). Studies using mutagenesis and recombinant expression in
cells (10, 11) and transgenic mice (12), and using airway smooth muscle cells endogenously expressing these 2-AR variants
(13), have shown that some forms of the 2-AR display distinct
differences in signaling and /or regulation after chronic exposure to -agonists. It could thus be possible that these polymorphisms might explain altered pharmacologic responses to
-agonist treatment. In fact, recent studies have suggested
that these polymorphisms may be associated with asthma of
differing severity (14, 15). Further, other studies have reported
a relationship between these polymorphisms and the degree of
responsiveness or desensitization to the bronchodilator effect of
-agonists (16). However, these studies have produced inconsistent results. Altered desensitization to -agonists has alternately been associated with either arginine or glycine polymorphisms at the 16 position of the 2-AR and in other cases
with polymorphisms at the 27 position. Many of these studies
have been short-term, and several of these studies have compared asthmatics of differing severities in whom etiologic heterogeneity may influence apparent associations.
We therefore genotyped the subjects who participated in
our earlier trial. We stratified the treatment cohorts and outcome measures with respect to genotype for the 2-AR polymorphisms that occur most commonly in the population. Our
data indicate that differences in 2-AR genotypes are associated with altered responses to the regular use of albuterol.
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METHODS |
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TOP
ABSTRACT
INTRODUCTION
METHODS
RESULTS
DISCUSSION
REFERENCES
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Inhaled -Agonist Trial
The subjects in this report were participants in the National Heart,
Lung, and Blood Institute (NHLBI) Asthma Clinical Research Network Trial on the effects of regular versus intermittent use of inhaled
-agonists (8). Two well-matched cohorts of patients with mild asthma
(FEV1 
70% of predicted, provocative concentration of methacholine causing a 20% reduction in FEV1 [PC20] 
8 mg/ml, and inhaled
-agonists as the only asthma treatment) were recruited at five centers
across the United States. The patients were randomized to receive regular (two puffs 4 times a day) plus as-needed albuterol or as-needed albuterol alone, in a double-blind manner. The predetermined primary
outcome variable for this study was morning (A.M.) peak expiratory
flow. Additional monitoring included evening (P.M.) peak expiratory
flow, peak expiratory flow variability, asthma symptom scores, the
number of inhalations of rescue albuterol used, FEV1, methacholine
responsiveness, asthma-specific quality-of-life measures, and the acute
response to inhaled albuterol. At the completion of the 16-wk randomized treatment period, all patients were switched in a single-blind fashion to regularly scheduled inhaled placebo for a 4-wk withdrawal period ("run out") in order to identify any deleterious effects of regularly
scheduled albuterol treatment on lung function that may have been
masked by the bronchodilation induced by the inhaled albuterol.
We found no differences in A.M. peak expiratory flow between the group treated regularly with albuterol and the group receiving intermittent albuterol, despite the fact that on average the regular treatment group used 7.2 puffs a day of albuterol whereas the as-needed group used only 1.3 puffs a day. There were no clinically significant differences between the groups in other physiologic or clinical variables monitored during the study. We concluded that, in patients with mild asthma, the regularly scheduled use of albuterol was not associated with either beneficial or adverse effects.
However, there were some patients who experienced a deterioration in peak expiratory flow during the study. At the end of the trial, we contacted all participants who had been randomized and collected either blood or buccal brushings to obtain cellular material for genotyping. Patients who could not return to their clinical center were mailed cheek brushes to use and to return to the laboratory by mail. Additional informed consent for genotyping was obtained from all participants at all study sites. Material for genotyping was obtained from 190 of 255 randomized patients.
Genotypic Analysis
Terminology. Two alleles have been identified for each of the common polymorphisms at amino acids 16 and 27 (20). At amino acid 16 of the 2-AR, the alternative alleles contain either glycine (Gly) or
arginine (Arg). The three possible genotypes at this locus are termed
B16-Arg/Arg, B16-Arg/Gly, or B16-Gly/Gly. At amino acid 27, the
alternative alleles contain either glutamic acid (Glu) or glutamine
(Gln). The three possible genotypes at this locus are termed B27-Gln/
Gln, B27-Gln/Glu, or B27-Glu/Glu.
Assessment of genotype. Genotyping was performed by individuals who were unaware of the results from the clinical trial. Genomic DNA was prepared for genotypic analysis by standard techniques (21). Genotypes at the B16 and B27 position were assessed by the amplification refractory mutation system (ARMS) (22, 23) similar to that previously described (14). Genotype was assigned in approximately 10% of individuals by oligonucleotide-specific hybridization as a quality control measure throughout the study.
Statistical Analysis
The statistical analysis is similar to that described for the Asthma
Clinical Research Network (ACRN) -agonist trial (8). Briefly, because of the longitudinal nature of most of the response variables, a
mixed-effects linear model was applied (24, 25); this approach allowed the use of all data obtained, not just the data obtained at a single visit. This statistical model was determined before the start of the
study, and therefore other models were not considered during data
analysis. A Bonferroni correction was applied for the three pairwise
comparisons among genotypes, thereby reducing the significance level
to 0.0167.
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RESULTS |
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ABSTRACT
INTRODUCTION
METHODS
RESULTS
DISCUSSION
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Genotypes
Material for genotyping was obtained from 190 of the 255 subjects in the trial. At the B16 and B27 loci, a definite genotype could be assigned in 179 and 177 individuals, respectively. The distribution of patients for whom genotypic information was obtained is shown in Table 1. The allele frequency of B16-Arg and Gly was 0.4 and 0.6, respectively, and of B27-Gln and Glu 0.6 and 0.4, respectively. The number of individuals possessing each of the potential genotypes at each locus individually (B16 or B27) was consistent with the Hardy-Weinberg equilibrium. A total of 173 individuals were successfully genotyped at both loci. The distribution of the various combinations of heterozygous and homozygous polymorphisms at positions 16 and 27 is shown in Table 2. It is interesting that all individuals with the B16-Arg/Arg genotype had the B27-Gln/Gln genotype.
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Results Stratified by Genotype
There were no significant differences in the baseline characteristics when we stratified our subjects by genotype (Table 3). We examined the effects of regular versus as-needed albuterol use over the 20 wk from the time of randomization through
the end of the run-out, stratified by genotype (see METHODS).
In B16-Arg/Arg patients, but not in any of the patients with alternate genotypes, regular -agonist use was associated with a
decline in the primary outcome indicator
A.M. peak expiratory flow, and a decline in the secondary outcome indicator
P.M. peak expiratory flow (Table 4). These changes did not occur in any of the other B16 genotypes or any of the B27 genotypes (Table 4). In B16-Arg/Arg patients, regular -agonist
treatment produced a fall in A.M. peak expiratory flow whereas
as-needed treatment produced a slight rise in peak expiratory
flow (Figure 1). In these patients, the difference in the change
in peak expiratory flow between regularly scheduled and as-needed treatment over the study period was 30.5 ± 12.1 L/min
(p = 0.012, Figure 1, Table 4). The decline in peak expiratory flow produced by regularly scheduled -agonist treatment was
restricted to the B16-Arg/Arg patients. B16-Gly/Gly patients
who received regularly scheduled treatment had no drop in
peak expiratory flow (Figure 1, Table 4). Their A.M. peak expiratory flow was 23.8 ± 9.5 L/min greater than that of the B16-Arg/Arg patients who received regularly scheduled treatment
(p = 0.012, Figure 1).
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The patterns of change were similar for the secondary outcome indicator, P.M. peak expiratory flow (Figure 2, Table 4).
The P.M. peak expiratory flows of B16-Arg/Arg subjects who
received regular treatment fell 31.1 ± 13.0 L/min compared
with those B16-Arg/Arg patients who received as-needed
treatment only (p = 0.0167). Once again, the effect of regular
treatment occurred only in those with the B16-Arg/Arg genotype. B16-Gly/Gly patients who received regular -agonist
treatment did not experience a drop in mean P.M. peak expiratory flow, and their P.M. peak expiratory flow was 31.6 ± 10.2 L/min greater than the B16-Arg/Arg patients who received
regular treatment (p = 0.0019, Figure 2). The decrease in A.M.
and P.M. peak expiratory flow in response to regular -agonist use held true even when the B16 heterozygotes were included
with the Gly/Gly homozygotes. When the B16-Arg/Arg subjects were compared with all B16-non-Arg/Arg subjects as a
group (B16-Arg/Gly and B16-Gly/Gly), the A.M. peak expiratory flow difference was 26.6 ± 8.6 (p = 0.0019) L/min and the
P.M. peak expiratory flow difference 30.6 ± 9.2 L/min (p = 0.0009) (data not shown). The A.M. and P.M. peak expiratory
flow differences also held true when these differences were expressed as a percent of predicted peak expiratory flow and
represented a 7% difference owing to regular -agonist use (Table 4).
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There were no clinically significant B16 genotype-related differences in any of the other secondary outcome indices monitored. With respect to the B27 locus, there were no significant differences between individuals harboring each of the genotypes in any of the outcomes monitored. There were also no differences in asthma exacerbations and treatment failures among genotypes by treatment (Fisher exact test).
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DISCUSSION |
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ABSTRACT
INTRODUCTION
METHODS
RESULTS
DISCUSSION
REFERENCES
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In this report, using a large cohort of well characterized, mild
asthmatics (190 patients), we demonstrate that regular use of
-agonists can produce distinct effects on airway function in
patients with specific polymorphisms of the -adrenergic receptor. Regular use, as opposed to as-needed use, reduced both
A.M. and P.M. peak expiratory flow in patients homozygous for
the Arg-16 allele. This deterioration in pulmonary function associated with regular albuterol use was particular to the Arg-16
allele because patients homozygous for the Gly-16 allele did not
experience such an effect. Further, we found that polymorphisms at amino acid 27 of the -adrenergic receptor did not alter the response to regular -agonist use in these asthmatic patients.
In vitro studies have demonstrated that B16-Arg and B16-Gly
variants of the -adrenergic receptor do not differ in terms of receptor binding characteristics or receptor-mediated activation of
the adenyl cyclase second messenger pathway. However, they do
differ in the extent to which the respective receptors are downregulated in response to long-term catecholamine exposure (10-
13). Thus, 2-AR polymorphisms might alter the response to the
use of -agonists. However, the clinical effects and associations noted with 2-AR polymorphisms have been contradictory in nature. Several of the associations have been derived from studies
that contained small groups of patients and/or asthmatics who
were heterogeneous in terms of disease severity.
We were able to genotype (in a blinded manner) 190 carefully
defined patients available from our study of regular versus as-needed -agonist use and to examine the influence of genotype
at the 2-AR on the effect of regular use of albuterol on our predetermined primary outcome variable, A.M. peak expiratory flow.
Peak expiratory flow had been chosen as the primary outcome
variable for the prior study because it is a well-documented indicator of deteriorating asthma control (26, 27). It is a measurement that was obtained daily from our patients, thus providing a
large number of data points for each patient. We performed our
primary comparison in homozygous individuals because we believed that heterozygous individuals might have an intermediate
phenotype that might have been difficult to define.
We found that regular albuterol use was associated with a decline in A.M. and P.M. peak expiratory flow in patients who are B16-Arg/Arg. These data suggest that patients with the B16-Arg/Arg polymorphism may be at risk for adverse effects, or less of a salutary effect, when using -agonists regularly. This is of particular importance because many patients with mild asthma will increase the frequency of -agonist use during asthma exacerbations. Our data suggest that a proportion of these patients (the approximately 15% of patients who are Arg/Arg at B16), may not benefit
to the same degree as the general population, when they use their
-agonists regularly and may actually experience a decline in airway function, especially as they discontinue high-dose -agonist
therapy. Whether concomitant inhaled corticosteroids would
blunt this adverse effect is unclear. However, more than 70% of
patients with asthma use -agonists as their only form of therapy
and will increase -agonist use with exacerbations.
The A.M. peak expiratory flow difference that occurred in
the B16-Arg/Arg patients was greater than 30 L/min. A decline of this magnitude has been associated with significant
clinical deteriorations in asthmatics. For example, declines of
19 and 23 L/min in A.M. and P.M. peak expiratory flow, respectively, have been reported in patients taken off inhaled corticosteroids and were associated with clinical deteriorations
(28). A 25 L/min difference occurred between asthmatics
treated with regular inhaled corticosteroids versus those
treated with regular -agonists in a major study by Haahtela
and colleagues (29). It is therefore of interest that we did not
observe differences, that varied by genotype, in our secondary
outcome variables such as peak flow variability or PC20.
Previously published studies have suggested that other -agonist genotypes may be associated with asthma of differing
severity or other markers associated with asthma. Patients
with nocturnal asthma were more likely to have the B16-Gly
form of the receptor (14). B27-Gln has been associated with
elevated levels of IgE (30). In another study, B27-Glu has
been associated with a lower degree of airway reactivity than
B27-Gln (15). In contrast to our study, these studies encompassed a wide range of asthmatics, including moderate to severe asthmatics. Because our patients were all chosen to be
mild asthmatics, we did not expect to have a wide enough
range of asthmatics to detect relationships related to severity.
For instance, in our population, the peak mean peak expiratory flow difference was approximately 7% of the baseline peak expiratory flow and thus may not have been adequate to
precipitate appreciable functional changes in this mild population over such a short time period. However, in a more severe
population of asthmatics such a decline, if it occurred, might
have more profound and more rapid clinical implications. It is
thus of interest, that in the slightly more severe population of
asthmatics reviewed previously, a worsening of airway reactivity did in fact occur in the B16-Arg homozygotes (18).
It also worth noting that the majority of the decline in peak
expiratory flow in the B16-Arg/Arg patients occurred in the run-out, after patients had stopped using their albuterol regularly. We had specifically designed the run-out period of this
study because of a concern that the bronchodilating effect of
the regular -agonist use might mask a deleterious effect. The
precise mechanism of this postalbuterol deterioration in disease control is unclear. Although rebound effects occur after
withdrawal of -agonists, it is not clear that they are long-lived
enough to explain the effect we observed.
Although our study was not designed to explain the mechanism of the decline in airway function that occurred only in the
B16-Arg/Arg subjects who used regular albuterol, our knowledge of the properties of the alternate forms of the receptors
may explain our findings. B16-Gly expression downregulates to
a greater extent than B16-Arg after exposure to catecholamines
(11). Taken alone, these data would suggest that tachyphylaxis
to the effect of regular exogenous -agonists would occur to a
greater degree with B16-Gly. However, in a proposal of a so-called "dynamic model" of receptor kinetics (20), it has been
suggested that endogenous catecholamines actively downregulate the 2-AR at baseline. Thus, in the resting state, Gly16 (the
variant more susceptible to downregulation) would be downregulated to a greater extent than Arg16 by endogenous catecholamines. It then follows that the tachyphylactic effect of regular
exogenous exposure to -agonists would be most apparent in
Arg16 patients because their receptors have not yet been downregulated. Further, this dynamic model would predict that the
initial response to albuterol would be depressed in individuals
with the Gly16 polymorphism, because their receptors have
been endogenously downregulated to a greater extent than in
patients with the Arg16 polymorphism. The findings of Martinez
and coworkers (19) are in concert with this model because they
found that B16-Arg/Arg patients have an enhanced bronchodilator response to albuterol. In contrast, reports in two much
smaller studies have found decreased responses, or greater degrees of tachyphylaxis, associated with Gly16 or Gln27 (16, 17).
However, the latter study involved the -agonist formoterol,
which has unique interactions with the -receptor. Our findings
of a lack of effect of genotypic variants at the B-27 locus are also
consistent with the in vitro studies. Whereas B27-Gln has a
greater tendency to downregulation than B27-Glu, these effects
are overcome by the downregulation phenotype at B16.
Although the effects we observed are consistent with the
effects predicted by the dynamic model for the Arg/Arg genotype at position 16, we cannot rule out the possibility that the
mechanism of this effect may be totally unrelated to the downregulation of the receptors. Rather, it is possible that the B16-Arg genotype is in linkage disequilibrium with a polymorphism
nearby on the genome. For example, the Arg16 polymorphism
has recently been shown to be in linkage disequilibrium with a
polymorphism at the 5' leader cistron, which is 102 base pairs
upstream of the 2-AR coding block and codes for a peptide
that influences the translation of the 2-AR gene (31). While
this specific polymorphism is also in linkage disequilibrium
with Gln27 as well, making it unlikely to be the source of the
association we observed, other polymorphisms may yet be
identified. In this regard, there is a linkage between B16-Arg
and B27-Gln so that haplotypically all patients who are B16-Arg possess B27-Gln (see Table 2). An analysis of the subgroup of patients who were B27-Gln/Gln showed that the adverse effect of regular use of -agonists was still attributable to
the Arg/Arg genotype (data not shown). Regardless of the
mechanism of the effect, the association we observed suggests
that the Arg16 polymorphism, at the very least, clinically
serves as a marker for an altered pharmacologic response to
-agonists.
In summary, we have demonstrated that the homozygous
arginine genotype at position 16 of the 2-AR can influence
the response to use of a -agonist. The altered response in
these patients occurs only with regular use, as compared with
as-needed use. Most asthmatics, whether using concomitant
anti-inflammatory therapy or not, increase their -agonist use
during exacerbations. Approximately 15% of the population
is homozygous for Arg 16. If corroborated, our findings suggest that these individuals may benefit by avoiding regularly
scheduled -agonists and might be candidates for earlier intervention with anti-inflammatory agents.
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Footnotes |
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Correspondence and requests for reprints should be addressed to Elliot Israel, M.D., Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115.
(Received in original form July 21, 1999 and in revised form December 16, 1999).
Acknowledgments: The authors gratefully acknowledge the assistance of Lisa Atkin in preparing the manuscript for publication and Erik Lehman for performing additional statistical analyses.
Supported by NIH Grants U10 HL 51831, U10 HL 51834, U10 HL 51843, U10 HL 51810, U10 HL 51823, U10 HL 51845, R01 HL 45967 and P01 HL 41496.
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References |
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TOP
ABSTRACT
INTRODUCTION
METHODS
RESULTS
DISCUSSION
REFERENCES
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Additional Asthma Clinical Research Network Investigators: J. D. Spahn, National Jewish Medical and Research Center, Denver, CO; T. J. Craig, and E. A. Mauger, Milton S. Hershey Medical Center, Hershey, PA; S. A. Nachman, The Harlem Hospital Center, New York, NY; C. V. Chambers, K. R. Epstein, and S. J. McGeady, Thomas Jefferson University, Philadelphia, PA
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