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Characterization of Histaminergic Receptors

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1979
  • Abstract
  • Table of Contents
  • Materials
  • Figures
  • Literature Cited

Abstract

This unit describes radioligand binding protocols for histamine H1 , H2 , H3 , and H4 receptors. Because these receptors demonstrate low amino acid sequence homology and divergent pharmacological characteristics, assay conditions vary for each. These protocols can be employed in high?throughput screening programs aimed at identifying selective agonists and antagonists for these sites.

Keywords: histaminergic receptors; H1 histamine receptors; H2 histamine receptors; H3 histamine receptors; H4 histamine receptors; radioligand binding assays; antihistamines

     
 
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Table of Contents

  • Strategic Planning
  • Basic Protocol 1: Measurement of [3H]Mepyramine Binding to Cloned Human H1 Receptors
  • Alternate Protocol 1: Measurement of [3H]mepyramine Binding to Native H1 Receptors in Tissue Membrane Homogenates
  • Basic Protocol 2: Measurement Of [3H]tiotidine Binding to Cloned Human H2 Receptors
  • Alternate Protocol 2: Measurement of [125I]aminopotentidine Binding to Native H2 Receptors in Tissue Membrane Homogenates
  • Basic Protocol 3: Measurement of [3H]N‐α‐Methyl Histamine Binding to Cloned Human H3 Receptors in Membranes
  • Alternate Protocol 3: Measurement of [3H]N‐α‐Methyl Histamine Binding to Native H3 Receptors
  • Basic Protocol 4: Measurement of [3H]histamine Binding to Cloned Human H4 Receptors in Membranes
  • Support Protocol 1: Data Analysis
  • Reagents and Solutions
  • Commentary
  • Literature Cited
  • Figures
  • Tables
     
 
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Materials

Basic Protocol 1: Measurement of [3H]Mepyramine Binding to Cloned Human H1 Receptors

  Materials
  • Cell line (e.g., HEK‐293 cells; ATCC# CRL‐1573) stably transfected (see De Backer et al., ) with human H 1 receptors using Lipofectamine 2000 (Life Technologies), grown to confluence
  • Cell dissociation buffer (Life Technologies), prewarmed to 37°C
  • Dulbecco's phosphate‐buffered saline (DPBS; calcium‐ and magnesium‐free; see recipe ), ice‐cold
  • Na+ /K+ assay buffer (see recipe ), 25°C
  • 20 µM promethazine (Research Biochemicals) in 50 mM Na+ /K+ assay buffer (see recipe ), or other unlabeled ligand to measure nonspecific binding (Table 1.19.2 )
  • 1.5 nM [3 H]mepyramine (20 to 30 Ci/mmol; Perkin‐Elmer Life Sciences; Table 1.19.3 ) in Na+ /K+ assay buffer (see recipe )
  • Test compounds (optional) in Na+ /K+ assay buffer (see recipe )
  • 0.5% (v/v) polyethyleneimine (PEI)
  • Rinse buffers (50 mM Tris·Cl; appendix 2A ): pH 7.7 at 25°C, pH 7.4 at 0°C
  • Scintillation cocktail: e.g., Microscint 20 (Packard) or Ready‐Solv HP (Beckman Coulter)
  • Tissue homogenizer (e.g., T 25 Ultra‐Turrax; IKA Works)
  • Deep‐well 96‐well microtiter plates (2.2 ml volume; e.g., Bioblocks, Brandel), 2‐ml strip tubes, or 12×75–mm glass test tubes
  • GF/B Unifilter plates (Packard), or equivalent
  • Cell harvester or vacuum filtration manifold (e.g., Packard, Brandel, or Skatron), optional
  • 60°C oven, optional
  • Additional reagents and equipment for performing Bradford, Lowry, or BCA protein assays ( appendix 3A )
    Table 1.9.2   MaterialsAffinity Constants (K i Values) of Reference Agents for the Cloned Human H 1 , H 2 , H 3 , and H 4 ReceptorsProperties of Commercially Available Radioligands for Histamine Receptors

    Compound K i values (nM) Compound source
    H 1 H 2 H 3 H 4
    Agonists
    Histamine 6500 33,000 7.0 8.1 d Sigma
    Imetit 30,000 39,000 0.40 2.7 d RBI
    Immepip 22,000 >100,000 2.8 9.0 d Tocris Cookson
    N ‐α‐methyl histamine 10,000 42,000 2.6 23 d RBI
    R ‐α‐methyl histamine 57,000 >100,000 2.1 146 d RBI
    S ‐α‐methyl histamine >100,000 >100,000 38 RBI
    H 1 Antagonists
    Chlorpheniramine 7.6 6100 1500 RBI
    Diphenhydramine 17 2500 >10,000 >10,000 d RBI
    Promethazine 5.0 200 >10,000 RBI
    H 2 Antagonists
    Burimamide >100,000 2,600 5.1 180 d Smith‐Kline Beecham c
    Cimetidine >10,000 320 >100,000 >10,000 d RBI
    Ranitidine >10,000 77 21,000 >10,000 d RBI
    Tiotidine >100,000 27 30,000 Tocris Cookson
    Zolantidine 1200 41 1700 Tocris Cookson
    H 3 Antagonists
    Ciproxifan 45,000 80,000 0.75 1880 Bioprojet c
    Clobenpropit 2900 5000 0.84 12.8 d RBI
    Iodophenpropit 800 1100 0.72 Tocris Cookson
    Thioperamide >100,000 >100,000 72.6 27 d Tocris Cookson
    A‐331440 2940 14,400 3.2 >10,000 Sigma
    ABT‐239 1620 6760 0.45 >10,000 Abbott Labs c
    H 4 Antagonists
    Thioperamide >100,000 >100,000 72.6 27 d Tocris Cookson
    JNJ7777140 c >10,000 d >1000 d >5000 d 4.1 d Johnson & Johnson
    Radioligand Agonist or antagonist K d for receptor (nM) Specific activity (Ci/mmol) Nonspecific binding Signal‐to‐noise ratio Source Comments
    H 1 Receptor
    [3 H]Mepyramine Antagonist 0.5 ‐ 2.0 20‐30 Low High Perkin‐Elmer
    H 2 Receptor
    [3 H]Cimetidine Antagonist 100‐500 10‐30 High Low Amersham
    [3 H]Tiotidine Antagonist 2‐10 70‐90 High Low Perkin‐Elmer Good SNR for recombinant receptors
    [125 I]Iodo‐aminopotentidine Antagonist 0.1‐0.5 2000 High Low Amersham Cost‐limiting for broad‐based screening Custom synthesis required
    H 3 Receptor
    [3 H]Histamine Agonist 2‐10 25‐30 High Low Perkin‐Elmer Selectivity: H 3 > H 4 > H 1 > H 2
    [3 H]R ‐α‐methyl histamine Agonist 0.2‐0.8 20‐50 Moderate Moderate Amersham
    [3 H]N ‐α‐methyl histamine Agonist 0.2‐0.8 45‐90 Low High Perkin‐Elmer SNR in tissue‐based assays > RαMH
    [125 I]Iodo‐proxyfan Antagonist 0.2‐0.5 2000 High Low Amersham Binds to H 3 R and sites displaced by metyrapone
    H 4 Receptor
    [3 H]Histamine Agonist 50‐200 25‐30 High Low Perkin‐Elmer Selectivity: H 3 > H 4 > H 1 > H 2

     c Not available commercially.
     d Liu et al., .
    Table 1.9.3   MaterialsAffinity Constants (K i Values) of Reference Agents for the Cloned Human H 1 , H 2 , H 3 , and H 4 ReceptorsProperties of Commercially Available Radioligands for Histamine Receptors

    Compound K i values (nM) Compound source
    H 1 H 2 H 3 H 4
    Agonists
    Histamine 6500 33,000 7.0 8.1 d Sigma
    Imetit 30,000 39,000 0.40 2.7 d RBI
    Immepip 22,000 >100,000 2.8 9.0 d Tocris Cookson
    N ‐α‐methyl histamine 10,000 42,000 2.6 23 d RBI
    R ‐α‐methyl histamine 57,000 >100,000 2.1 146 d RBI
    S ‐α‐methyl histamine >100,000 >100,000 38 RBI
    H 1 Antagonists
    Chlorpheniramine 7.6 6100 1500 RBI
    Diphenhydramine 17 2500 >10,000 >10,000 d RBI
    Promethazine 5.0 200 >10,000 RBI
    H 2 Antagonists
    Burimamide >100,000 2,600 5.1 180 d Smith‐Kline Beecham c
    Cimetidine >10,000 320 >100,000 >10,000 d RBI
    Ranitidine >10,000 77 21,000 >10,000 d RBI
    Tiotidine >100,000 27 30,000 Tocris Cookson
    Zolantidine 1200 41 1700 Tocris Cookson
    H 3 Antagonists
    Ciproxifan 45,000 80,000 0.75 1880 Bioprojet c
    Clobenpropit 2900 5000 0.84 12.8 d RBI
    Iodophenpropit 800 1100 0.72 Tocris Cookson
    Thioperamide >100,000 >100,000 72.6 27 d Tocris Cookson
    A‐331440 2940 14,400 3.2 >10,000 Sigma
    ABT‐239 1620 6760 0.45 >10,000 Abbott Labs c
    H 4 Antagonists
    Thioperamide >100,000 >100,000 72.6 27 d Tocris Cookson
    JNJ7777140 c >10,000 d >1000 d >5000 d 4.1 d Johnson & Johnson
    Radioligand Agonist or antagonist K d for receptor (nM) Specific activity (Ci/mmol) Nonspecific binding Signal‐to‐noise ratio Source Comments
    H 1 Receptor
    [3 H]Mepyramine Antagonist 0.5 ‐ 2.0 20‐30 Low High Perkin‐Elmer
    H 2 Receptor
    [3 H]Cimetidine Antagonist 100‐500 10‐30 High Low Amersham
    [3 H]Tiotidine Antagonist 2‐10 70‐90 High Low Perkin‐Elmer Good SNR for recombinant receptors
    [125 I]Iodo‐aminopotentidine Antagonist 0.1‐0.5 2000 High Low Amersham Cost‐limiting for broad‐based screening Custom synthesis required
    H 3 Receptor
    [3 H]Histamine Agonist 2‐10 25‐30 High Low Perkin‐Elmer Selectivity: H 3 > H 4 > H 1 > H 2
    [3 H]R ‐α‐methyl histamine Agonist 0.2‐0.8 20‐50 Moderate Moderate Amersham
    [3 H]N ‐α‐methyl histamine Agonist 0.2‐0.8 45‐90 Low High Perkin‐Elmer SNR in tissue‐based assays > RαMH
    [125 I]Iodo‐proxyfan Antagonist 0.2‐0.5 2000 High Low Amersham Binds to H 3 R and sites displaced by metyrapone
    H 4 Receptor
    [3 H]Histamine Agonist 50‐200 25‐30 High Low Perkin‐Elmer Selectivity: H 3 > H 4 > H 1 > H 2

Alternate Protocol 1: Measurement of [3H]mepyramine Binding to Native H1 Receptors in Tissue Membrane Homogenates

  • Male Hartley strain guinea pigs, 6 to 8 months in age
  • 0.9% NaCl solution in squeeze bottle
  • Dissection instruments (e.g., Stoelting)
    • Small animal decapitator
    • Operating scissors
    • Bone rongeurs
    • Strong forceps
    • Cold dissecting plate (or ice‐filled Petri dish)
    • Scalpel
    • Dissecting knife
  • Gas cylinder containing 60% CO 2 /40% O 2 connected to a suitable chamber for anesthetizing guinea pig

Basic Protocol 2: Measurement Of [3H]tiotidine Binding to Cloned Human H2 Receptors

  Materials
  • Na+ /K+ assay buffer (see recipe ), ice‐cold
  • 1 mM cimetidine (Research Biochemicals) in 50 mM Na+ /K+ assay buffer, or other unlabeled ligand to measure nonspecific binding (Table 1.19.2 )
  • 0.75 nM [3 H]tiotidine (70 to 90 Ci/mmol; Perkin‐Elmer Life Sciences; Table 1.19.3 ) in 50 mM Na+ /K+ assay buffer (see recipe )
  • Test compounds (optional) in Na+ /K+ assay buffer (see recipe )
  • 0.5% (v/v) polyethyleneimine (PEI)
  • Rinse buffer, ice‐cold: 50 mM Tris·Cl ( appendix 2A ), pH 7.7 at 25°C, pH 7.4 at 0°C
  • Scintillation fluid: Microscint 20 (Packard) or Ready‐Solv HP (Beckman Coulter)
  • Deep well 96‐well microtiter plates (2.2‐ml volume; e.g., Bioblocks, Brandel), 2‐ml strip tubes, or 12×75–mm glass test tubes
  • GF/B filters or Unifilter GF/B plates (Packard), or equivalent
  • Cell harvester or vacuum filtration manifold (e.g., Packard, Brandel, or Skatron), optional
  • 60°C oven, optional
  • Additional reagents and equipment for preparing membranes (see protocol 1 ) and performing Bradford, Lowry, or BCA protein assays ( appendix 3A )

Alternate Protocol 2: Measurement of [125I]aminopotentidine Binding to Native H2 Receptors in Tissue Membrane Homogenates

  • Male Hartley strain guinea pigs, 6 to 8 months in age
  • 0.9% NaCl solution in squeeze bottle
  • 500 µM cimetidine (Research Biochemicals) in 50 mM Na+ /K+ assay buffer, or other unlabeled ligand to measure nonspecific binding (Table 1.19.2 )
  • 60 pM [125 I]iodoaminopotentidine (2000 Ci/mmol; Amersham; Table 1.19.3 ) in 50 mM Na+ /K+ assay buffer
  • Dissection instruments (e.g., Stoelting)
    • Small animal decapitator
    • Operating scissors
    • Bone rongeurs
    • Strong forceps
    • Cold dissecting plate (or ice‐filled Petri dish)
    • Scalpel
    • Dissecting knife
  • Gas cylinder containing 60% CO 2 /40% O 2 connected to a suitable chamber for anesthetizing guinea pig
  • Additional reagents and equipment for preparing guinea pig cortical membranes ( protocol 2 )

Basic Protocol 3: Measurement of [3H]N‐α‐Methyl Histamine Binding to Cloned Human H3 Receptors in Membranes

  Materials
  • Cell line (e.g., HEK‐293 cells, ATCC #CRL‐1573, or rat C6 glioma, ATCC #CCL‐107) transfected (see Lovenberg et al., ) with human H 3 receptors, grown to confluence
  • TEP assay buffer (see recipe )
  • Tris/EDTA assay buffer (without proteases; see recipe ), ice‐cold
  • 100 µM histamine (Research Biochemicals) in Tris/EDTA assay buffer, or other unlabeled ligand (e.g., 30 µM thioperamide; Tocris Cookson) to measure nonspecific binding (Table 1.19.2 )
  • 1 nM [3 H]N ‐α‐methyl histamine (NAMH; 45 to 90 Ci/mmol; Perkin‐Elmer Life Sciences; Table 1.19.3 ) in Tris/EDTA assay buffer (see recipe )
  • Test compounds (optional) in Tris/EDTA assay buffer (see recipe )
  • 0.5% (v/v) polyethyleneimine (PEI)
  • Rinse buffer, ice‐cold: 50 mM Tris·Cl ( appendix 2A ), pH 7.7 at 25°C, pH 7.4 at 0°C
  • Scintillation fluid: Microscint 20 (Packard) or Ready‐Solv HP (Beckman Coulter)
  • Tissue homogenizer (e.g., T 25 Ultra‐Turrax; IKA Works)
  • Clinical tabletop centrifuge
  • Deep‐well 96‐well microtiter plates (2.2‐ml volume, e.g., Bioblocks, Brandel), 2‐ml strip tubes, or 12 × 75–mm glass test tubes
  • GF/B filters or Unifilter GF/B plates (Packard)
  • Cell harvester or vacuum filtration manifold (e.g., Packard, Brandel, or Skatron)
  • 60°C oven (optional)
  • Additional reagents and equipment for preparing membranes (see protocol 1 and protocol 2 ) and for Bradford, Lowry, or BCA protein assays ( appendix 3A )

Alternate Protocol 3: Measurement of [3H]N‐α‐Methyl Histamine Binding to Native H3 Receptors

  • Male Sprague‐Dawley rat (200 to 250 g) or male Hartley guinea pig (6 to 8 months in age)
  • TEP assay buffer (see recipe ), ice‐cold
  • Tris‐EDTA assay buffer (see recipe )
  • 30 µM thioperamide (Tocris Cookson) in TEP assay buffer, or other unlabeled ligand to measure nonspecific binding (Table 1.19.2 )
  • 1.5 nM [3 H]N‐α‐methyl histamine (NAMH; 45 to 90 Ci/mmol; Perkin‐Elmer Life Sciences; Table 1.19.3 ) in TEP assay buffer
  • Additional reagents and equipment for obtaining brain tissue ( protocol 2 )

Basic Protocol 4: Measurement of [3H]histamine Binding to Cloned Human H4 Receptors in Membranes

  Materials
  • Cell lines (e.g., human HEK‐293, ATCC# CRL‐1573; or SK‐N‐MC, ATCC# HTB‐10) transfected (Liu et al., ) with human H 4 receptors, grown to confluence
  • TEP assay buffer (see recipe )
  • Tris‐EDTA assay buffer (see recipe )
  • 200 µM thioperamide (Tocris Cookson) in Tris‐EDTA assay buffer (see recipe ) to define nonspecific binding
  • [3 H]histamine (Perkin‐Elmer)
  • Test compounds
  • Scintillation cocktail: e.g., Ready‐Solv HP (Beckman Coulter)
  • Tissue homogenizer (e.g., T 25 Ultra‐Turrax; IKA Works)
  • Deep‐well 96‐well microtiter plates (2.2 ml volume; e.g., Bioblocks, Brandel), 2‐ml strip tubes, or 12×75–mm glass test tubes
  • GF/B Unifilter plates (Packard), or equivalent
  • Cell harvester or vacuum filtration manifold (e.g., Packard, Brandel, or Skatron), optional
  • 60°C oven, optional
  • Additional reagents and equipment for preparing H 4 receptor membranes (see protocol 1 )
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Figures

  •   Figure 1.19.1 Microtiter plate 96‐well format scheme for saturation binding assay providing 12 concentrations of radioligand covering a 100‐fold concentration range. Concentration 1 (0.09 nM in this example) is pipetted into row A, wells 1 through 6, to which have been added appropriate volumes of assay buffer for total binding wells and an appropriate concentration of a blocking agent for nonspecific binding (NSB) wells. This concentration of radioligand can also be pipetted into wells 1 and 2 of row G to serve as filter blanks, if desired. Similar steps are taken for each increasing concentration of radioligand (indicated by increased shading of the background) over a 100‐fold concentration range. The dilution strategy shown is suitable for [3 H]mepyramine binding to H1 histaminergic receptors. There is a slight bias toward more concentrations of radioligand at the low end of the concentration range, because these are often more useful in defining the dissociation constant of the radioligand in subsequent data analyses. The signal‐to‐noise ratio is greater, and there is a more dynamic change in radioligand binding at these lower concentrations; these changes become less dynamic as saturation of receptor sites is approached. To explore additional concentrations of a well characterized radioligand with low filter blanks, rows G and H can be used for up to four more concentrations of radioligand. This dilution scheme was used in the assay illustrated in Figure
    View Image
  •   Figure 1.19.2 Microtiter plate 96‐well format scheme for competition binding assay, providing 11 concentrations for each of 4 test compounds. Compound 1 is pipetted into rows A and B, in concentrations ranging from 100 nM to 0.1 nM (final concentrations, allowing for dilution by addition of other reagents). Note that at each end of the concentration‐response curve, 10‐fold changes in the concentrations are used. This allows a broader coverage of concentration ranges, and it also places additional data points on those parts of a concentration‐response curve where greater dynamic changes in radioligand binding are anticipated. A compound expected or known to be more potent (Compound 2) is pipetted similarly into rows C and D, although 10‐fold lower concentrations are used than with compound 1. Rows E and F are filled with compound 3, which is expected to be very potent, such that concentrations in the picomolar range are used. Compound 4 is pipetted similarly to compound 1. Wells labeled “total” contain a corresponding volume of assay buffer or diluent for test compounds, and wells labeled “NSB” contain the same volume of the appropriate concentration of the compound used to define nonspecific binding.
    View Image
  •   Figure 1.19.3 Saturation binding results for H1 receptors expressed in HEK‐293 cells, based on the assay illustrated in Figure . Human H1 receptors were incubated with different concentrations of [3 H]mepyramine as described in . Nonspecific binding (triangles) was subtracted from total binding (circles) to yield specific binding (squares). As can be seen, most of the binding is specific. Transforming the specific binding data according to the procedure of Scatchard (inset) provides an estimate of the affinity of the radioligand ( K d = 0.85 nM, derived from the inverse of the slope of the line) and the receptor density ( B max = 2700 fmol/mg protein, derived from the x ‐intercept).
    View Image
  •   Figure 1.19.4 Saturation binding results for human H2 receptors expressed in HEK‐293 cells, based on an assay strategy similar to that illustrated in Figure . Human H2 receptors were incubated with different concentrations of [3 H]tiotidine as described in . Nonspecific binding (triangles) was subtracted from total binding (circles) to yield specific binding (squares). As can be seen, most of the binding is specific binding. Transforming the specific binding data according to the procedure of Scatchard (inset) provides an estimate of the affinity of the radioligand ( K d = 6.6 nM) and the receptor density ( B max = 23 pmol/mg protein).
    View Image
  •   Figure 1.19.5 Saturation binding results for human H3 receptors expressed in HEK‐293 cell membrane homogenates, based on the assay illustrated in Figure . Human H3 receptors were incubated with different concentrations of [3 H] N ‐α‐methyl histamine (NAMH) as described in . Nonspecific binding (triangles) was subtracted from total binding (circles) to yield specific binding (squares). As can be seen, most of the binding is specific binding. Transforming the specific binding data according to the procedure of Scatchard (inset) provides an estimate of the affinity of the radioligand ( K d = 0.50 nM) and the receptor density ( B max = 1220 fmol/mg protein).
    View Image

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   West, R.E. Jr., Wu, R‐L., Billah, M.M., Egan, R.W., and Anthes, J.C. 1999. The profiles of human and primate [3H]Nα‐methyl histamine binding differ from that of rodents. Eur. J. Pharmacol. 177:233‐239.
   Witte, D.G., Yao, B.B., Miller, T.R., Carr, T.L., Cassar, S., Sharma, R., Faghih, R., Surber, B.W., Esbenshade, T.A., Hancock, A.A., and Krueger, K.M. 2006. Detection of multiple H3 receptor affinity states utilizing [3H]A‐349821, a novel, selective, non‐imidazole histamine H3 receptor inverse agonist radioligand. Br. J. Pharmacol. 148:657‐670.
   Yao, B.B., Witte, D.G., Miller, T.R., Carr, T.L., Kang, C.H., Cassar, S., Faghih, R., Bennani, Y.L., Surber, B.W., Hancock, A.A., and Esbenshade, T.A. 2006. Use of an inverse agonist radioligand [3H]A‐317920 reveals distinct pharmacological profiles of the rat histamine H3 receptor. Neuropharmacology. 50:468‐478.
Key References
   De Backer, et al., 1993. See above.
   Cloning of the human H1 receptor gene and initial pharmacological characterization.
   Gantz et al., 1991. See above.
   Cloning of the human H2 receptor gene and initial pharmacological characterization.
   Gajtkowski, G.A., Norris, D.B., Rising, T.J., and Wood, T.P. 1983. Specific binding of [3H]tiotidine to histamine H2 receptors in guinea‐pig cerebral cortex. Nature 304:65‐67.
   First successful radioligand described for H2 receptors after a number of false starts.
   Hancock et al., 2003. See above.
   Comprehensive review of histamine H3 receptor isoform heterogeneity.
   Lovenberg et al., 1999. See above.
   Cloning of the human H3 receptor gene and initial pharmacological characterization.
   Oda et al., 2000. See above.
   Cloning of the human H4 receptor gene and initial pharmacological characterization.
   West et al., 1999. See above.
   Characterization of homogenate radioligand binding in rat, human and non‐human primate brain indicating pharmacological differences may exist.
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