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The KATP channel in migraine pathophysiology: a novel therapeutic target for migraine

The Journal of Headache and Pain volume 18, Article number: 90 (2017) Cite this article

Abstract

Background

To review the distribution and function of KATP channels, describe the use of KATP channels openers in clinical trials and make the case that these channels may play a role in headache and migraine.

Discussion

KATP channels are widely present in the trigeminovascular system and play an important role in the regulation of tone in cerebral and meningeal arteries. Clinical trials using synthetic KATP channel openers report headache as a prevalent-side effect in non-migraine sufferers, indicating that KATP channel opening may cause headache, possibly due to vascular mechanisms. Whether KATP channel openers can provoke migraine in migraine sufferers is not known.

Conclusion

We suggest that KATP channels may play an important role in migraine pathogenesis and could be a potential novel therapeutic anti-migraine target.

Introduction

Adenosine 5′-triphosphate-sensitive K+ (KATP) channel openers have been used in clinical trials for the treatment of hypertension and asthma. The most common side effect mentioned during treatment with KATP channel openers was headache (62, 64, 66–79) (Tables 2 and 3). However, only little attention has been focused on the role of KATP channels in migraine pathophysiology.

KATP channels were originally identified in cardiomyocytes [1], but have also been found in several tissues, including pancreatic α- and ß-cells, smooth muscle, skeletal muscle and central neurons [2, 3]. The channels belong to the family of inwardly rectifying K+ channels that are inhibited at physiological intracellular levels ATP/ADP ratio. When intracellular ATP is reduced under conditions of metabolic challenges they open. KATP channels are critical in regulating insulin secretion, controlling vascular tone, and protecting cells against metabolic stress [2, 4, 5].

Over the past three decades, some preclinical evidence has emerged indicating that KATP channels may play an important role in migraine pathophysiology. In particular, the vasodilation effect of KATP channels is relevant, since it is has been established that endogenous neurotransmitters that trigger migraine attacks are often associated with dilation of cranial arteries [6].

Here we review preclinical and clinical studies on KATP channels and discuss the KATP channel as a novel therapeutic target for migraine treatment.

Molecular structure and isoforms

The KATP channel is a hetero-octameric complex that consists of four pore-forming K+ inwardly rectifying (Kir) subunits and four regulatory sulfonylurea receptor (SUR) subunits [7].

The Kir6.x subunit exists in two isoforms, Kir6.1 and Kir6.2. The SUR subunit belongs to the ATP-binding cassette (ABC) transporter family, regulated by sulfonylurea, with three isoforms, SUR1, SUR2A, and SUR2B [7, 8].

KATPchannels have specific tissue expression with different compositions of Kir6.x and SUR subunits which lead to distinct functional properties (Figs. 1 and 2 and Table 1).

Fig. 1
figure 1

Molecular structure and isoforms. a Two major Kir6.x isoforms (Kir6.1 and Kir 6.2) and three major SUR isoforms (SUR1, SUR2A and SUR 2B) have been identified. b Kir.x subunits combine tissue-specifically with different SUR subunits to form various native KATP channels. Pancreatic, cardiac and smooth muscle KATP channels are made up of Kir6.2/SUR1, Kir6.2/SUR2A and Kir6.1 (or Kir6.2)/SUR2B, respectively [2]. Kir, inwardly rectifying K+ channels; SUR, sulfonylurea receptor

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Fig. 2
figure 2

Schematic diagram of the KATP channel. Kir6.x subunits have two transmembrane domains, and a large cytoplasmic domain including an inhibitory binding site for ATP [8, 84]. SUR subunits have many transmembrane domains and two intracellular nucleotide binding domains (NBD1 and NBD2), which stimulate opening of the channel after binding to MgADP [85]

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Table 1 Distribution of KATP channels
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Channel function

KATP channel activity is controlled by changes in concentrations of intracellular ATP and magnesium adenosine diphosphate (Mg-ADP). KATP channels couple the metabolic state of the cell to the membrane potential and thus play a crucial role in many tissues under both physiological and pathological conditions [9]. K+ channels participate in the regulation of vascular tone, including cerebral arteries [10]. When intracellular ATP is reduced, KATP channels become activated; K+ efflux hyperpolarize the membrane and close voltage-operated Ca2+-channels (VOCC). The result is a decrease in cytosolic Ca2+ concentration followed by relaxation of vascular smooth muscle cells and an increase in blood flow [11]. The same applies if cells are exposed to metabolic stress such as ischemia or hypoglycemia [12]. Closure of K+ channels leads to membrane depolarization and constriction of the vessels [11]. In addition an increase in intracellular cAMP and cGMP levels activate KATP channels to produce vasodilation [11]. Synthetic KATP channel openers (like levcromakalim and cromakalim) and blockers (like glibenclamide, second generation of sulfonylurea and PNU37883A) directly activate or inhibit the vascular KATP channels, respectively [9] (Fig. 3).

Fig. 3
figure 3

Opening of vascular ATP sensitive K channels. Endogenous molecules (ATP, cAMP and cGMP) and exogenous pharmacological agents (cromakalim and glibenclamide) regulate the activity of KATP channels, which help controlling the vascular tone

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Distribution of KATP channels in migraine related structures

Intracranial arteries

KATP channels are present and functional in intracranial arteries [13,14,15]. They are found in vascular smooth muscle cells and vascular endothelial cells [16, 17]. In rat cerebral arteries, the distribution of KATP channels varies with vessel size and brain region [18]. Real time polymerase chain reaction (RT-PCR) analysis revealed Kir6.1 and SUR2B subunits in middle meningeal artery (MMA) and middle cerebral artery (MCA) in rats and pigs [19, 20]. This profile of KATP channels is also identified in human MMA [21] (Table 1).

Trigeminal ganglion and trigeminal nucleus caudalis

Kir6.1, Kir6.2, SUR1 and SUR2 are expressed in the trigeminal ganglion and trigeminal nucleus caudalis [22] (Table 1). In trigeminal neurons Kir 6.1 and Kir 6.2 immunoreactivity were expressed in cells with all soma sizes in all three divisions of the trigeminal ganglion [23].

KATP channels openers and migraine signaling pathways

A number of endogenous vasoactive signaling molecules have been implicated in migraine [6], and KATP channels may interact with these molecules.

Nitric oxide (NO)

In humans, infusion of the NO donor, glyceryl trinitrate, and inhibition of the breakdown of cGMP by sildenafil [24] provoke migraine attacks in migraineurs [25,26,27]. The NO-cGMP signaling pathway is involved in the relaxation of vascular smooth muscle [28]. In vitro studies with cerebral arteries isolated from rat and piglet and extra-cerebral arteries from rabbit reported that activation (opening) of KATP channels contributed to both cAMP- and cGMP-mediated vasodilation [29,30,31]. Yuan et al. [32] reported that sildenafil-induced vasodilation in porcine retinal arterioles was significantly inhibited by glibenclamide and suggested that cGMP signaling triggers opening of KATP channels. In contrast, NO-induced dural and pial artery dilation in rats was not attenuated by the KATP channel blocker, glibenclamide [33]. Together, these data suggest that interspecies differences are likely to explain the discrepancy in findings of the role of KATP channels in NO-induced vasodilation.

Calcitonin gene-related peptide (CGRP)

CGRP is one of the most potent endogenous vasodilators and major arteries in the intracranial circulation of man and animals are innervated by CGRP-containing nerve fibers [34,35,36]. Efficacy of CGRP antagonism is established in acute [37, 38] and preventive treatment of migraine [39]. CGRP activates vascular smooth muscle KATP channels indirectly through adenylate cyclase and protein kinase A (PKA) phosphorylation (Fig. 4) [40,41,42,43]. In rats, CGRP-induced dilation of the dural and pial arteries in vivo was shown to be inhibited by glibenclamide [33], but KATP channel openers do not interact with CGRP release in trigeminal ganglion and trigeminal nucleus caudalis [22]. This suggests that KATP channels are involved in CGRP-induced intracranial vasodilation.

Fig. 4
figure 4

Signaling pathways through vascular smooth muscle KATP channels. Numerous endogenous vasodilators activate vascular smooth muscle KATP channels through adenylate cyclase and PKA phosphorylation. Conversely, endogenous vasoconstrictors inhibit vascular smooth muscle KATP channels through DAG and PKC phosphorylation. CGRP, calcitonin gene-related peptide; PGI2, prostaglandin I2; VIP, vasoactive intestinal peptide; AngII, angiotensin II; NPY, neuropeptide Y; NA, noradrenaline; 5-HT, 5-hydroxytryptamine; Gs, G-protein-coupled receptor alpha stimulation; Gi, G-protein-coupled receptor alpha i/q; DAG, diacylglycerol; PKA and PKC, protein kinase A and C, respectively

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Pituitary adenylate cyclase activating polypeptide (PACAP)

Pituitary adenylate cyclase activating polypeptide (PACAP) is a potent endothelium independent vasodilator of various vascular beds, including cerebral arteries [44, 45]. In vivo and in vitro studies have demonstrated that PACAP dilates cranial arteries in different species, e.g. human cerebral arteries [34, 46, 47], pig pia artery, canine basilar artery, cat cerebral arteries, rabbit posterior cerebral arteries and rat middle cerebral arteries [48,49,50,51,52]. Emerging data suggest that PACAP or it receptors are a promising target for migraine therapeutics [53]. PACAP has three types of receptors; Pituitary adenylate cyclase PAC1 (pituitary adenylate cyclase receptor 1), VPAC1 (vasoactive intestinal peptide and pituitary adenylate cyclase receptor 1) and VPAC2 (vasoactive intestinal peptide and pituitary adenylate cyclase receptor 2) [54] the two latter ones are also activated by vasoactive intestinal peptide and all three receptors are found in cerebral artery smooth muscle cells [55]. Through these receptors, PACAP leads to an increase in intracellular cAMP, which activates PKA and produces vasodilation by several mechanisms including activation of KATP channels (Fig. 4) [45]. Interestingly, glibenclamide could partially inhibit PACAP induced vasodilation in cerebral, coronary and pulmonary arteries, suggesting that PACAP may also activate KATP channels [44, 45].

Prostaglandins

Prostacyclin (PGI2) activates and sensitizes meningeal sensory afferents, and provokes immediate migraine-like attacks in migraine sufferers [56]. PGI2 also increases KATP channel activity in vascular smooth muscle preparations by cAMP-dependent PKA activation [57] (Fig. 4).

Headache induced by KATP channels openers

In the late 80’s there was a tremendous interest in developing novel KATP channel openers for hypertension, angina pectoris and asthma. Three pharmacological drugs were developed, pinacidil, nicorandil and levcromakalim. One of most common adverse events after treatment reported in these studies was headache [58,59,60,61,62,63].

Six clinical trials with pinacidil have been published for treatment of essential hypertension. Between 7% and 21% of the patients reported headache as an adverse effect (Table 2).

Table 2 Headache incidences registered during randomized controlled trials (RCT) and open label clinical trials with pinacidil
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Nicorandil was tested for the treatment of angina pectoris and ischemic heart disease. 23% to 88% of the patients reported headache as an adverse event (Table 3). The high incidence of headache is likely due to the mixed KATP channel opener and NO donor properties of nicorandil which thus cause vasodilation via two separate mechanisms.

Table 3 Headache incidences registered during randomized controlled trials (RCT) and open label clinical trials with nicorandil
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Levcromakalim was investigated for the treatment of asthma and essential hypertension. In these studies between 29% and 76% of the patients reported headache as an adverse event (Table 4).

Table 4 Headache incidences registered during randomized controlled trials (RCT) and open label clinical trials with levcromakalim
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The selective synthetic KATP channel openers levcromakalim and pinacidil have been shown to induce dilation in rat cranial arteries [13, 15, 19] and in isolated human cerebral arteries [64]. Moreover, the arterial dilation can be inhibited by synthetic KATP channel blockers like glibenclamide [10, 33] and PNU37883A [21, 65] (Fig. 3). These findings suggest that high incidences of headache could be due to vasoactive effect of the KATP channel openers in pain-sensitive extra- and/or intracerebral arteries.

Discussion and future perspectives

KATPchannels are expressed in migraine-related structures such as the cranial arteries, TG and TNC [18,19,20,21,22, 66]. KATP channels are also connected to a number of key molecules in migraine pathogenesis, particularly nitric oxide, CGRP, PACAP and PGI2 known to provoke migraine attacks [56, 67,68,69,70,71]. Therefore, the KATP channels are interesting in migraine context.

Human experimental models have demonstrated that the activation of the cAMP and cGMP pathways can trigger headache in healthy volunteers and migraine attacks in migraine sufferers [6, 71, 72]. The cAMP and cGMP signaling pathways are crucial in the activation of KATP channels, which result in the relaxation of smooth muscle [29,30,31]. Furthermore, synthetic KATP channel openers like levcromakalim and pinacidil trigger headache in non-migraine patients [58,59,60,61,62,63]. Although a detailed description of levcromakalim- and pinacidil-induced headache and accompanying symptoms are lacking, these data support a role of KATP channels in migraine headache. Because KATP channel openers were tested for other indications, there are no available data on the potential migraine-inducing effects of pinacidil and levcromakalim in migraine patients. It is conceivable that both headache and migraine are underreported as adverse events, as was found for the phosphodiesterase inhibitors, cilostazol and sildenafil [73, 74].

In addition to the vasoactive effects, the KATP channels might also tap into other parts of the migraine cascade. For a number of patients, migraine attacks are associated with transient focal neurological symptoms called the aura [75], possibly caused by cortical spread depression (CSD) [76]. During CSD K+ conductance is increased, and CSD may be inhibited by Kir antagonist [77]. The fact that KATP channels open under cellular stress, as seen during long lasting depolarizations, could provide a link between KATP channels, CSD and migraine aura.

With regard to the migraine pain, it is worth noting that KATP channels are also found in peripheral nociceptive fibers [78] and activation of these channels play a crucial role in anti-nociception at both spinal and supra-spinal levels [23, 79]. The exact role of these findings in the headache induced by KATP channel openers is unknown.

If KATP channel openers are in fact able to trigger migraine, the next step to consider is whether KATP channel antagonists can relieve migraine. KATP blockers for the treatment of migraine should be selective for the Kir6.1/SUR2B subtype because of its dominant presence in vascular tissue (Table 1). The necessity of a subtype specific blocker is unavoidable because of occurrence of different subtypes in different tissues. Glibenclamide cannot be used due to its high affinity to the Kir6.2/SUR1 subtype of KATP channels present in the pancreas with hypoglycemia as a side effect [80]. PNU-37883A is a Kir6.1 selective KATP channel blocker that was originally developed as a diuretic drug [81, 82]. The drug was not approved to human studies because of its cardiac depressant activity in animal studies [83]. This precludes further clinical development of PNU-37883A due to possible serious adverse events but may not exclude further investigations in other blockers against Kir6.1 subunit because it is not clear if all blockers against Kir6.1 subunit have non-favorable effects. These findings indicate that the SUR2B subunit and the Kir6.1 subunit should be a potential target for the treatment of migraine, but proof of concept studies are needed to examine this hypothesis.

Conclusion

Emerging evidence suggests that KATP channels could be involved in the pathophysiology of migraine. KATP channels exist in structures which are believed to be linked to the pathophysiology of migraine, including cerebral and meningeal arteries and the trigeminal system [19,20,21,22]. It is established that the cAMP signaling pathway and possibly cGMP signaling pathway are involved in the activation of KATP channels [29,30,31]. This is interesting in migraine contexts, as the two signaling pathways are likely to be crucial in the development of a migraine attack.

We suggest that the presented clinical and theoretical evidence support further studies of KATP channel openers in migraine context. Future human studies will help clarify the role of KATP channels in the pathophysiology of migraine.

Abbreviations

ABC transporter:

ATP-binding cassette transporter

BA:

Basilar artery

CGRP:

Calcitonin gene-related peptide

CSD:

Cortical spread depression

DRG:

Dorsal root ganglia

KATP channel:

Adenosine 5′-triphosphate-sensitive K+ channel

Kir:

K+ inwardly rectifying

MCA:

Middle cerebral artery

Mg-ADP:

Magnesium adenosine diphosphate

MMA:

Middle meningeal artery

NBD:

Nucleotide binding domains

NO:

Nitric oxide

PACAP:

Pituitary adenylate cyclase activating polypeptide

PGI2 :

Prostacyclin

SUR:

Sulfonylurea receptor

TG:

Trigeminal ganglion,

TNC:

Trigeminal nucleus caudatus

VOCC:

Voltage-operated Ca2+-channels

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This article was supported by the Lundbeck Foundation.

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Authors and Affiliations

  1. Danish Headache Center, Department of Neurology, Rigshospitalet Glostrup, Faculty of Health and Medical Sciences, University of Copenhagen, Nordre Ringvej 57, DK-2600, Copenhagen, Denmark

    Mohammad Al-Mahdi Al-Karagholi, Jakob Møller Hansen, Johanne Severinsen, Inger Jansen-Olesen & Messoud Ashina

  2. Danish Headache Center, Department of Neurology, Glostrup Research Park, Rigshospitalet Glostrup, Copenhagen, Denmark

    Inger Jansen-Olesen

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  1. Mohammad Al-Mahdi Al-Karagholi
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  2. Jakob Møller Hansen
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MMK designed and performed the review, with the help of JMH, JS, IJO and MA. MMK drafted the manuscript with the help of JMH, JS, IJO and MA. All authors read and approved the final manuscript.

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Al-Karagholi, M.AM., Hansen, J.M., Severinsen, J. et al. The KATP channel in migraine pathophysiology: a novel therapeutic target for migraine. J Headache Pain 18, 90 (2017). https://doi.org/10.1186/s10194-017-0800-8

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The Journal of Headache and Pain

ISSN: 1129-2377

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