The cyclooxygenase theory of aspirin-induced asthma

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Eur Resplr J                                                                                                              REVIEW
1990, 3, 588-593

               The cyclooxygenase theory of aspirin-induced asthma

                                                        A. Szczeklik

The cyclooxygenase theory of aspirin-induced asthma. A. Szczeklik               Dept of Allergy and Clinical Immunology,
ABSTRACT: Aspirin-Induced asthma Is a distinct clinical syndrome wblcb          Copemii:us Academy of Medicine, Skawinska,
affects about 10% of adult asthmatics. In these patients asplrlri and several   Cracow, Poland.
other analgesics precipitate asthmatic attacks. The Idea that the attacks
                                                                                Correspondence: A. Szcuklik, Dept of Allergy and
mlgbt result from the specific lnblbltlon of a single enzyme, namely            Clinical Immunology, Copemicus Academy of
cyclooxygenase, has gained both experimental and Clinical support.              Medicine, Skawinska 8, 31-066 Cracow, Poland.
It stimulated a number of hypotheses on the mechanism of
bronchoconstrlctlon. All these hypotheses, here discussed, operate within       Keywords: Aspirin; aspirin -induced asthma;
the framework of the cyclooxygenase theory. Their major assuniption is          cyclooxygenase; eicosanoids.
that inhibition of cyclooxygenase triggers specific biochemical reactions
which lead to open asthma attacks.                                              Received: June 13, 1989; accepted September 7, 1989.
Eur Respir J., 1990, 3, 588-593.

  The majority of people tolerate aspirin well.                      In the early seventies, allergic mechanisms as an
Asthmatics, however, are an exception. In about 10% of            explanation for aspirin intolerance were vigorously pur-
adults with asthma, but rarely in asthmatic children,             sued. Contrary to these concepts, the cyclooxygenase
aspirin and other non-steroidal anti-inflammatory drugs           theory proposed that precipitation of asthmatic attacks
(NSAID) precipitate asthma attacks. This distinct                 by aspirin is not based on antigen-antibody reactions, but
clinical syndrome is called aspirin-induced asthma (AlA)          stems from the pharmacological action of the drug. The
[1-3]. It appeals to pharmacologists, biochemists and             original observations [5, 7] that the drug intolerance could
clinicians as a remarkable model for the study of                 be predicted on the basis of its in vitro inhibition of
mechanisms operating in asthma.                                   cyclooxygenase, have been consistently reaffirmed
   Many concepts have been advanced to explain the                during the ensuing years [8] . Evidence in favour of the
pathogenesis of AlA [3, 4]. The idea that the attacks             cyclooxygenase theory [3] can be summarized as
might result from the specific inhibition of a single             follows:
enzyme, namely cyclooxygenase, in the respiratory tract           1) analgesics with anticyclooxygenase activity
has been, perhaps, most discussed. It stimulated a                invariably precipitate bronchoconstriction in aspirin-
number of hypotheses o n mechanisms of                            sensitive patients;
bronchoconstriction. All of these hypotheses operate              2) analgesics not affecting cyclooxygenase are devoid
within the framework of the cyclooxygenase theory. Thus,          of bronchospastic properties in these patients;
their major assumption, now rather firmly established, is         3) there is a positive correlation between the potency of
that inhibition of cyclooxygenase triggers specific               analgesics to inhibit cyclooxygenase in vitro and their
biochemical reactions which lead to open asthma attacks.          potency to induce asthmatic attacks in the sensitive
                                                                  patients;
                                                                  4) the degree of enzymatic inhibition that is sufficient to
                 Formulation of the theory                        precipitate bronchoconstriction is an individual hallmark
                                                                  (thus, if the threshold dose for any anticyclooxygenase in
   A hypothesis was put forward [5] that in sensitive             a particular patient is known, one can predict the
patients, precipitation of asthma attacks by certain anal-        threshold doses for other analgesics in that patient);
gesics results from inhibition of cyclooxygenase, leading         5) in vitro anti-cyclooxygenase inhibitors activate plate-
to an imbalance of prostanoids in the respiratory tract.          lets to release cytotoxic mediators in aspirin-sensitive
Cyclooxygenase, an atypical lipoxygenase, is present in           asthmatics, but not in the atopic asthmatics or healthy
most human tissues, including lungs. It introduces two            subjects [9, 10];
molecules of oxygen into arachidonic acid, converting it          6) in patients with AlA inhibition of thromboxane Az
into a prostaglandin peroxide. This is the beginning of           (TXA2), next to cyclooxygenase enzyme in the ara-
the metabolic pathway leading to formation of                     chidonic acid cascade, neither precipitates asthmatic
prostaglandins, thromboxane and prostacyclin. Cyclooxy-           attacks nor alters pulmonary function [11];
genase is inhibited by aspirin, and several other                 7) after aspirin desensitization, cross-desensitization to
analgesics; a phenomenon which might explain their                other analgesics which inhibit cyclooxygenase also
pharmacological action [6).                                       occurs [8].
ASPIRIN-INDUCED ASTHMA                                                   589

  Thus, the inhibition of bronchial cyclooxygenase by                       if cyclooxygenase had been inhibited. The definition of
aspirin-like drugs appears to set off a chain of reactions                  leukotrienes suggested that they would provide potent
leading to asthma attacks in aspirin-intolerant patients.                   mediation of neutrophil intlux into the tissue via the action
What follows at the biochemical level remains largely                       of leukotriene B4 (LTB4), and a potent stimulation for
unknown, (fig. 1).                                                          bronchoconstriction, mucosal penneability and mucus
                                                                            secretion by the actions of leukotriene C4 (LTC4), leukot-
                                12-HETE,                                    riene D4 (LTD 4 ), and leukotriene E 4 (LTE 4 ). The
                     4_,.o,,.~       b )                                    explanation for aspirin-induced asthma was then
                                                                            postulated as simply being caused by shunting of
        PGH2 4            / r--      AA      I'@     11 LTA4 __. LTB4       arachidonic acid from the generation of prostaglandins to
                                                           +
     ~',,,~',,                                         LTC4                 the biosynthesis of leukotrienes. In a simplified way, it
                                                                            would be a redirection of flow in a bifurcated vessel:
                                                       LTD4
                                                                            from the blocked arm to an open one. More sophisticated
                                                       LTE4                 explanations have been put forward. Biosynthesis of
                                 '   '._. Cytotoxic                         leukotrienes could be enhanced by overproduction of
                                          mediator                          12-hydroperoxyeicosatetraenoic acid (12-HPETE) [14] or
                                         ·trom platelets                    removal of inhibiting control of PGEJPG!z [15]. Both
                                                                            possibilites are a logical consequence of cyclooxygenase
                                                                            pathway inhibition.
                                                                                There is some experimental support for the concept of
                                                                            shift in arachidonic acid metabolism, though clinical
                                                                            evidence is still lacking. In a guinea-pig model of
Fig. 1. - Aspirin-induced astluna hypothetical alterations in arachidonic   antigen-induced anaphylaxis, pretreatment of animals with
acid metabolism following inhibition of cyclooxygenase by aspirin.
AA: arachidonic acid; COX: cyclooxygenase; LOX: lipoxygcnase;               indomethacin resulted in an augmentation of the
PGH2: cyclic cndoperoxide !1~: PGI~: p~tacyclin; PGs: prosta~~;tandins;     pulmonary mechanical response to intravenous antigen
TXA1 : thromboxane A.,; LTA 4 : leukolncnc Ai._LTB 4 : lcukoLnene B,;       and this was accompanied by an increased generation of
LTC,: leukotricoe C,; L'l'D4 : leukotrienc 0 1; LTH4: leukotricne E4; 12-   LTB4 [16]. In antigen-challenged sheep lung in vivo,
[IIZTE: 12-hydroperoxyeicosatetraenoic ac1d; IS-HETE: JS-hydroper-
oxyeicosatetraenoic acid; LTX: lipoxin A; LXB: lipoxin B. PGE 2 :           cyclooxygenase inhibition enhanced leukotriene produc-
prostaglandin E2; PGF,..: prostaglandin F,...                                tion [17). Pretreatment of passively sensitized human
                                                                             airways with indomethacin resulted ~n an increased
                                                                             release of leukotrienes from human bronchi in response
                       Early explanations                                    to both antigen and anti-IgE stimulation [18]. However,
                                                                             others have found (19] that in normal human parenchyma
   At the time of publication of the cyclooxygenase hy-                      an anti-IgE challenge in the presence of indomethacin
pothesis [5), the only eicosanoids known to be produced                      does not produce a shift towards leukotriene formation.
by the cells of the respiratory tract were prostaglandin E2                     Two groups studied the release of leukotrienes into the
(PGE2) and prostglandin F,.. (PGF2«). It was presumed                        nasal cavity following aspirin administration to patients
(12), therefore, that although cyclooxygenase was inhib-                     with AlA. 0RTOLANI et al. [20] noticed an increase in
ited by aspirin, a selective deficiency among the                            mean LTC4 concentration in nasal washings of 7 aspirin-
cyclooxygenase products must also occur, such that                          sensitive asthmatics following nasal spray provocation
bronchodilator PGE 2 was decreased relative to bron-                         with aspirin. However, clinical symptoms occurred within
choconstrictor PGF2o:. This idea was not universally                         1-2 min of the challenge, while LTC4 increase was
appealing because, although the efficacy of aspirin and                      observed 60 min later. FERRERI et al. [21] used oral
certain other NSAIDs as inhibitors of cyclooxygenase                         aspirin to provoke clinical symptoms in 5 intolerant
was clearly demonstrated, relative effects on (PGH2)-PGE2                   patients. During the provoked reactions, LTC4 increased
isomerase and PGHz-PGFZ« isomerase were not.                                 in 3 patients. In 2 of the 5 patients a fall in PGE2 pre-
   An early explanation (5], that aspirin-sensitive                          ceded appearance of clinical symptoms: In the control
asthmatics might rely more on PGE 2 than on the                             subjects, ingestion of higher doses of aspirin (650 mg)
~-adrenergic system to keep their bronchi unobstructed,                      resulted in a distinct fall in PGE2 without the release of
seems unlikely today. These patients, indeed, respond                       LTC4 into nasal washings. A recent study by BISGAARD et
better to inhaled PGE 2 than do other asthmatics [I 3] but                  al. [22) has cast serious doubt on the validity of media-
clinical practice leaves no doubt that their lung function                   tor measurement in nasal lavage in relation to symptoms
also improves substantially following inhalation of                          following local nasal challenge.
~-mime tics.                                                                    It is not clear in which cells of the respiratory tract
                                                                            alterations in arachidonic acid metabolism might occur.
                                                                            Leucocytes, especially eosinophils, present in large
                Participation of leukotrienes                               amounts in nasal and bronchial tissue of aspirin-sensitive
                                                                            asthmatics [3, 23] could be considered as a source of
  In 1979, when leukotrienes were discovered, it became                      leukotrienes. GoETZL et al. [24] suggested a generalized
apparent that arachidonic acid could be diverted from the                   abnormality of the regulation of arachidonic acid oxida-
cyclooxygenase pathway to the 5-lipoxygenase pathway,                       tive pathways in peripheral blood leucocytes of patients
590                                                   A.   SZCZEKLIK

 with AlA. Two recent studies do not support this                the inhibitor, administered by inhalation remained,
 idea. NrZANKOWSKA et al. [25) studied production                however, uncertain.
 by polymorphonuclear leucocytes of 5-dehydroper-
 oxyeicosatetraenoic acid (5-HETE) and LTB4 in 10
 aspirin-sensitive asthmatics and 10 matched healthy                               Platelet involvement
 controls. The blood cells were obtained before admini-
 stration of the threshold doses of aspirin, and during the         In the last few years attention has been paid to
 aspirin-induced reactions. Initial levels of eicosanoids        possible participation of platelets in pathogenesis of
 determined did not differ between the two groups, and           bronchial asthma [34, 35], particularly in aspirin-induced
 remained unchanged following aspirin challenge. TsuoA           asthma [9, 14]. In patients with AlA, aspirin challenge
 et al. [26] measured the production of LTB 4 and LTC4 in        may lead to activation of peripheral blood platelets which
 peripheral blood leucocytes stimulated by calcium iono-         parallels the time course of bronchospastic reaction [36].
 phore A 23187. They compared 4 groups (controls,                In contrast to platelet activation, the detection of
 AlA, atopic and intrinsic asthma) before and after              endogenous platelet-activating factor (PAF) release has
 indomethacin challenge. All three asthmatic groups              not been a consistent finding. Aspirin-induced
 produced more LTC4 than the healthy controls, but there         bronchoconstriction does not seem to be based on the
 was no difference between aspirin-intolerant patients and       contracting properties of PAP [36].
 atopic or intrinsic ones. LTB4 production (as well as PGE2         In 1982, MAcLOUF et al. [14) noticed that platelets
 and TXB 2) was similar in all four groups. Indomethacin         12-HETE stimulated the generation of LTB 4 and
 did not affect leukotriene generation in any of the groups      5-HPETE in mixed platelet-leucocyte suspension. These
 studied.                                                        authors hypothesized that administration of aspirin to
    The concept of arachidonic acid shunting needs an            intolerant patients with asthma may lead to increased
 additional assumption that the airways of aspirin-              generation of 12-HPETE in their platelets [37] because
 intolerant patients are more sensitive to leukotrienes than     of impaired cyclooxygenase and 12-lipoxygenase balance,
 those of other patients with asthma [27]. If not, all asth-     or because of inhibition of peroxidase activity in
 matic patients would react with bronchoconstriction in          platelets. The released 12-HETE could activate 5-
 response to aspirin-like drugs. Three research groups           lipoxygenase of circulating blood leucocytes and pulmo-
 addressed this problem. VAG!n et al. [28] and BIANco            nary macrophages; generated leukotrienes would precipi-
 [29] measured bronchial response to LTC4 in 10 aspirin-         tate asthma.
 sensitive asthmatics as compared to 10 controls. They              AMEisEN and eo-workers [9, 10] reported that platelets
 were unable to fmd any significant difference. SAKAKIBARA       isolated from patients with aspirin-induced asthma react
 et al. [30] studied airway responsiveness to methacho-          abnormally in vitro to aspirin and other cyclooxygenase
 line, histamine and LTD4 in 12 patients with AlA, 13            inhibitors by generating cytocidal molecules that can kill
 patients with extrinsic asthma and 12 patients with             parasitic larvae. Aspirin-like drugs had no similar effect
 intrinsic asthma. There were no significant differences in      on platelets from normal donors or allergic asthmatics.
 either concentrations of any of the agents producing a          This abnormality, according to the authors [38], appears
 20% fall in forced expiratory volume in one second              to be associated with the inhibiting properties of the
 (FEV1) or the slope of FEV 1 changes among the groups           analgesics on the cyclooxygenase pathway, that leads to
 studied. The only positive finding was somewhat                 a defect of the binding of prostaglandin endoperoxide
delayed recovery in FEV 1 following challenge with               PGI-Iz to its receptors on the platelet membrane.
LTD4 in the aspirin-intolerant group as compared to the             NIZANKowsKA et al. [25] measured 12-HPETE produc-
others. These two studies do not support the concept of          tion by platelets in 10 aspirin-sensitive asthmatics and 10
increased bronchial reactivity to LTC4 or LTD4 • How-            matched healthy controls before and after administration
ever, the results of ARM et al. [3 1] suggest a selective        of the threshold doses of aspirin. Initial levels of
increase in airway responsiveness of LTE4 • They meas-           12-HPETE did not differ between the two groups.
ured a 35% fall in the specific airway conductance               Following aspirin challenge, 12-HPETE increase to
following histamine and LTE4 inhalation in 5 subjects            similar levels in both groups. These data do not support
with aspirin-induced asthma and in 15 asthmatics with-           a concept that there is a generalized abnormality
out aspirin sensitivity. The airways of aspirin-intolerant       in arachidonic acid oxidative pathways in platelets of
patients had a significant, 13-fold increase in responsive-      aspirin-sensitive asthmatics. Lack of protective effect of
ness to LTE4 relative to histamine when compared to              prostacyclin infusions on aspirin challenge also raises
control asthmatics. Interestingly, this hyperresponsive-         doubts about participation of platelets in the reactions
ness to LTE4 was abolished after aspirin-desensitization.        discussed [33].
   The concept of diversion of arachidonic acid
metabolism from prostanoids to leukotrienes is hard to
accept in view of likely compartmentalization of                  Compartmentalization of eicosanoids in the lungs
arachidonic acid in the lung [32]. This concept still awaits
testing with a powerful, specific leukotriene inhibitor.          An interesting hypothesis was recently proposed by
In a recent trial [33] pretreatment of aspirin-intolerant       GRYGLEWSKI [39]. It is based on the idea that arachidonic
asthmatics with leukotriene inhibitor failed to prevent         acid metabolism in the lungs is compartmentalized [32].
aspirin-precipitated bronchospasm. The bioavailability of       Thus, PGE2 is generated by smooth muscle of large
ASPIRIN-INDUCED ASTHMA                                                      591

airways, TXA 2 by contractile elements of lung                      numbers in response to viral infections and are highly
parenchyma, prostacyclin is produced by vascular                    specific.
endotheliwn, while leukotrienes are released by leucocytes          4) Lung macrophages produce PGE2 which suppresses
residing in the lungs and by fibroblasts. All these com-            immunological response [49]. including cytotoxic activ-
partments can be stimulated simultaneously by an immu-              ity of lymphocytes [50, 51]. This inhibition can be
nological reaction.                                                 overcome by anti-cyclooxygenase analgesics, which
  The hypothesis postulates that in patients with                   deprive macrophages of PGE2 •
AlA cyclooxygenase of large airways is more                            Several of the hypotheses presented here are now being
susceptible to pharmacological inhibition than that of lung         actively tested. New hypotheses might be expected to
parenchyma. In consequence, an ingestion of anti-                   emerge as the role of other eicosanoids, such as 15-
cyclooxygenase drug causes an increase in TXAjPGE 2                 lipoxygenase products, become more clear. Though
ratio. The most likely explanation for an augmented                 aspirin-induced asthma guards its secrets well, it attracts
selective susceptibility of bronchial cyclooxygenase to             more and more scientists and clinicians, convinced that
analgesics is chronic viral infection of the upper airways          unravelling the mysteries of this syndrome will give new
of patients with AlA [40, 41]. This chronic infection               insight into the pathogenesis of asthma.
might either change the biochemical characteristics of
cyclooxygenase in upper airways or make it easily
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ASPIRIN-INDUCED ASTIIMA                                                   593

La theorie de la cyclooxygenase pour /'asthma induit par           1~ fois expe(imerttale.S et ciWqucs. Blle a sclmule'\m certain
l'Aspirine. A. Szczeklik.                                          nombre d'hypotheses . ·~ur. lcs mecanis~es ,de, la btonchocon-
RESUME: L'aslhmc induit par I'Aspirine est un syndrome             strictiQn. ;routes ces hypotheses dkrites. ici se developpment
clinique bien defini, qui atteint environ 10% des aslhmatiques     dans le caare de ia. tMorle d~ la pycJooi!,ygenase. Leur suppo-
adultcs. Chcz ces patients, l'Aspirine et d'auttes analg~siques    sition pPhcip8.J.e est q\Je l'inhlbiti~ri de la cyclooxygenase
pouvent declencher des crises asthmatiques. L'idee que la crise    stimUJ.~ des· reactionS biochirniques spkifiques que conduisent
pourrait r~sulter de l'inhibition sp&:ifiquc d'une scule enzyme,   ~des crises ·d'astllma frlil).c• .. . ,.
en !'occurrence la cyclooxygenase, ttouve des confirmations ~      Eru Reipfr J.; 1990, 3, 587-S93.
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