Abstract
Secretory elements in the airways have a parasympathetic (cholinergic) supply, and activation of cholinergic nerves or administration of cholinomimetic drugs induces marked increases in secretion. In health, secreted high molecular weight glycoproteins (mucins) comprise a small proportion (~ 1%) of the thin layer of aqueous liquid (often termed “mucus”) which overlies the surface epithelium of the airways. The liquid also contains electrolytes, immunoglobulins, plasma-derived proteins (for example albumin), lipids, enzymes, anti-enzymes, antibacterials, cell products and mediators. The relative contribution of each component to the normal functioning of the liquid is comparatively unknown, and the relevance of the liquid to airway homeostasis is, for the most part, only theoretical [1]. Mucins possess viscoelastic properties which confer upon the liquid the ability to be transported on the tips of beating cilia. Airborne particles are trapped in the liquid and are removed from the airways by mucociliary clearance. In disease, changes in the amount of liquid, or its viscoelasticity, or in the relative proportion of its components, convert a normally protective mechanism into a pathophysiological one. The altered mucus is difficult to clear and accumulates in the airways. The resulting airflow limitation contributes to morbidity and mortality in bronchial diseases such as asthma, chronic bronchitis and cystic fibrosis (CF).
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Widdicombe JG (1998) Airway surface liquid: concepts and measurements. In: DF Rogers, MI Lethem (eds): Airway mucus: basic mechanisms and clinical perspectives. Birkhauser Verlag, Basel, 1–17
Ramnarine SI, Rogers DF (1994) Non-adrenergic, non-cholinergic neural control of mucus secretion in the airways. Pulmonary Pharmacol 7: 19–33
Baker B, Peatfield AC, Richardson PS (1985) Nervous control of mucin secretion into human bronchi. J Physiol 365: 297–305
Ramnarine SI, Hirayama Y, Barnes PJ, Rogers DF (1994). Tachykinin NK1 receptors mediate neurogenic mucus secretion in ferret trachea in vitro. Br J Pharmacol 113: 1183–1190
Rogers DF, Barnes PJ (1989) Opioid inhibition of neurally mediated mucus secretion in human bronchi. Lancet i: 930–932
Welsh MJ (1987) Electrolyte transport by airway epithelia. Physiol Rev 67: 1143–1184
Nathanson I, Nadel JA (1984) Movement of electrolytes and fluid across airways. Lung 162: 125–137
Sasaki T, Sanae S, Ikeda K, Sasaki H, Takishima T (1990) Sodium efflux from isolated submucosal gland in feline trachea. Am J Physiol 258: L112–L117
Jeffery PK (1983) Morphologic feature of airway surface epithelial cells and glands. Am Rev Respir Dis 128: 514–520
Fung DCK, Rogers DF (1997) Airway submucosal glands: physiology and pharmacology. In: DF Rogers, MI Lethem (eds): Airway mucus: basic mechanisms and clinical perspectives. Birkhauser Verlag, Basel, 179–210
Rogers DF (1994) Airway goblet cells: responsive and adaptable front line defenders. Eur Respir J 7: 1690–1706
Jacob S, Poddar S (1981) Mucus cells of the tracheobronchial tree in the ferret. Histochemistry 73: 599–605
Robinson NP, Venning L, Kyle H, Widdicombe JG (1986) Quantification of the secretory cells of the ferret tracheobronchial tree. J Anat 145: 173–188
Meini S, Mak JCW, Rohde JAL, Rogers DF (1993) Tachykinin control of feret airways: mucus secretion, bronchoconstriction and receptor mapping. Neuropeptides 24: 81–89
Rogers DF, Jeffery PK (1986) Inhibition by oral N-acetylcysteine of cigarette smoke-induced “bronchitis” in the rat. Exp Lung Res 10: 267–283
Meyrick B, Sturgess JM, Reid L (1969) A reconstruction of the human bronchial gland. Thorax 24: 729–736
Reid LM (1977) Secretory cells. Fed Proc 36: 2703–2707
Shimura A, Sasaki T, Sasaki H, Takishima T (1986) Contractility of isolated single submucosal gland from trachea. J Appl Physiol 60: 1237–1247
Shimura S, Sasaki T, Okayama H, Sasaki H, Takishima T (1987) Neural control of contraction in isolated submucosal gland from feline trachea. J Appl Physiol 62: 2404–2409
Goco RV, Kress MB, Branigan OC (1963) Comparison of mucus glands in the tracheal bronchial tree of man and animals. Annals NY Acad Sci 106: 555–571
Gatto LA, Aiello E (1981) Mucus-secreting glands and goblet cells in the trachea of the deer mouse Peromyscus leucopus. Trans Am Micros Soc 100: 355–365
Breeze RG, Wheeldon EB (1977) The cells of the pulmonary airways. Am Rev Respir Dis 116: 705–777
Phipps RJ, Richardson PS, Corfield A, Gallagher PK, Jeffery PK, Kent PW, Passatore M (1977) A physiological, biochemical and histological study of goose tracheal mucin and its secretion. Philos Trans Royal Soc London (Biol) 9: 513–543
Davis CW (1997) In vitro models for airways mucus secretion. Pulmonary Pharmacol 10: 145–155
Rogers DF (1997) In vivo preclinical test models for studying airway mucus secretion. Pulmonary Pharmacol 10: 121–128
Raphael GD, Baraniuk JN, Kaliner MA (1991) How and why the nose runs. J Allergy Clin Immunol 87: 457–467
Greiff L, Pipkorn U, Alkner U, Persson CGA (1990) The nasal pool device applies controlled concentrations of solutes on human nasal airway mucosa and samples its surface exudation/secretions. Clin Exp Allergy 20: 253–259
Boat TF, Cheng PW (1976) Mucous glycoproteins. In: JA Mangos, RC Talamo (eds): Cystic fibrosis: projections into the future. Stratton Intercontinental Medical Book Co, New York, 165–177
Rogers DF, Turner NC, Marriott C, Jeffery PK (1987) Cigarette smoke-induced “chronic bronchitis”: a study in situ of laryngo-tracheal hypersecretion in the rat. Clin Sci 72: 629–637
Tom-Moy M, Basbaum CB, Nadel JA (1983) Localisation and release of lysozyme from ferret trachea: effects of adrenergic and cholinergic drugs. Cell Tissue Res 228: 549–562
Webber SE (1989) Receptors mediating the effects of substance P and neurokinin A on mucus secretion and smooth muscle tone of the ferret trachea: potentiation by an enkephalinase inhibitor. Br J Pharmacol 98: 1197–1206
Kim KC (1991) Biochemistry and pharmacology of mucin-like glycoproteins produced by cultured airway epithelial cells. Exp Lung Res 17: 533–545
Gashi AA, Borson DB, Finkbeiner WE, Nadel JA, Basbaum CB (1986) Neuropeptides degranulate serous cells of ferret tracheal glands. Am J Physiol 251: C223–C229
Tokuyama K, Kuo H-P, Rohde JAL, Barnes PJ, Rogers DF (1990) Neural control of goblet cell secretion in guinea pig airways. Am J Physiol 259: L108–L115
Davies JR, Corbishley CM, Richardson PS (1990) The uptake of radiolabelled precursors of mucus glycoproteins by secretory tissues in the feline trachea. J Physiol 420: 19–30
Gashi AA, Nadel JA, Basbaum CB (1987) Autoradiographic studies of the distribution of 35sulfate label in ferret trachea: effects of stimulation. Exp Lung Res 12: 83–96
Pack RJ, Williams IP, Phipps RJ, Richardson PS (1984) A preparation for the study of secretory function of the human bronchus in vitro. Eur J Respir Dis 65: 239–250
Svitacheva N, Hovenberg HW, Davies JR (1998) Biosynthesis of mucins in bovine trachea: identification of the major radiolabelled species. Biochem J 333: 449–456
Webber SE, Widdicombe JG (1987) The actions of methacholine, phenylephrine, salbutamol and histamine on mucus secretion from the ferret in vitro trachea. Agents Actions 22: 82–85
Webber SE, Widdicombe JG (1987) The effect of vasoactive intestinal peptide on smooth muscle tone and mucus volume output from the ferret trachea. Br J Pharmacol 91: 139–148
Webber SE (1988) The effects of peptide histidine isoleucine and neuropeptide Y on mucus volume output from the ferret trachea. Br J Pharmacol 95: 49–54
Ueki I, German VF, Nadel JA (1980). Micropipette measurement of airway sub-mucosal gland secretion: autonomic effects. Am Rev Respir Dis 121: 351–357
Quinton PM (1979) Composition and control of secretions from tracheal bronchial submucosal glands. Nature 279: 551–552
Somerville M, Karlsson J-A, Richardson PS (1990) The effects of local anaesthetic agents upon mucus secretion in the feline trachea in vivo. Pulmonary Pharmacol 3: 93–101
Davies JR, Gallagher JT, Richardson PS, Sheehan JK, Carlstedt I (1991) Mucins in cat airway secretions. Biochem J 275: 663–669
Fung DCK, Beacock DJ, Richardson PS (1992) Vagal control of mucus glycoconjugate secretion into the feline trachea. J Physiol 453: 435–447
Varsano SC, Basbaum CB, Forsberg LS, Borson D, Caughey G, Nadel JA (1987) Dog tracheal epithelial cells in culture synthesise sufated macromolecular glyco-conjugates and release them from the cell surface upon exposure to extracellular proteinases. Exp Lung Res 13: 157–184
Florey H, Carlton H, Wells SA (1932) Mucus secretion in the trachea. Br J Exp Pathol 13: 269–284
Gallagher JT, Kent PW, Passatore M, Phipps RJ, Richardson PS (1975) The composition of tracheal mucus and the nervous control of its secretion in the cat. Proc Royal Soc (Biology) 192: 49–76
Laitinen A, Partanen M, Hervonen A, Laitinen LA (1985) Electron microscopic study on the innervation of the human lower respiratory tract: evidence of adrenergic nerves. Eur J Respir Dis 67: 209–215
Barnes PJ, Nadel, JA, Roberts JM, Basbaum CB (1983) Muscarinic receptors in lung and trachea: autoradiographic localization using [3H]quinuclidinyl benzilate. Eur J Pharmacol 86: 103–106
Van Koppen CJ, Blankesteijn WM, Klaassen ABM, R.de Miranda JF, Beld AJ, Van Ginneken CAM (1988) Autoradiographic visualisation of muscarinic receptors in human bronchi. J Pharmacol Exp Ther 244: 760–764
Mak JCW, Barnes PJ (1990) Autoradiographic visualization of muscarinic receptor subtypes in human and guinea pig lung. Am Rev Respir Dis 141: 1559–1568
Ramnarine SI, Haddad E-B, Khawaja AM, Mak JCW, Rogers DF (1996) On muscarinic control of neurogenic mucus secretion in ferret trachea. J Physiol 494: 577–586
Mak JCW, Baraniuk JN, Barnes PJ (1992) Localization of muscarinic receptor subtype mRNAs in human lung. Am J Respir Cell Mol Biol 7: 344–348
Basbaum CB, Barnes PJ, Grillo MA, Widdicombe JH, Nadel JA (1983) Adrenergic and cholinergic receptors in submucosal glands of the ferret trachea: auto-radiographic localization. Eur J Respir Dis 64 (suppl. 128): 433–435
Borson DB, Charlin M, Gold BD, Nadel JA (1984) Neural regulation of 35SO4-macromolecule secretion from tracheal glands of ferrets. J Appl Physiol 57: 457–466
Chakrin L, Baker AP, Christian P, Wardell J (1973) Effect of cholinergic stimulation on the release of macromolecules by canine trachea in vitro. Am Rev Respir Dis 108: 69–76
Dwyer TM, Szebeni A, Diveki K, Farley JM (1992) Transient cholinergic glycoconjugate secretion from swine tracheal submucosal gland cells. Am J Physiol 262: L418–L426
Hall IP (1992) Agonist-induced inositol phosphate responses in bovine airway submucosal glands. Am J Physiol 262: L257–L262
Wells UM, Robson A, Webber SE, Widdicombe JG (1992) An in vivo preparation for measurement of plasma protein and lysozyme output in the ferret tracheal lumen. Pulmonary Pharmacology 5,183–189
Corrales RJ, Coleman DL, Jacoby DB, Leikauf GD, Hahn HL, Nadel JA, Widdicombe JH (1986) Ion transport across cat and ferret tracheal epithelia. J Appl Physiol 61: 1065–1070
Knowles M, Murray G, Shallal J, Askin F, Ranga V, Gatzy J, Boucher R (1984) Bioelectric properties and ion flow across excised human bronchi. J Appl Physiol 56: 868–877
Jarnigan F, Davis JD, Bromberg PA, Gatzy JT, Boucher RC (1983) Bioelectric properties and ion transport of excised rabbit trachea. J Appl Physiol 55: 1884–1192
Sasaki T, Shimura S, Wakui M, Ohkawara Y, Takishima T, Mikoshiba K (1994) Apically localized IP3 receptors control chloride current in airway gland acinar cells. Am J Physiol 267: L152–L158
Griffin A, TM Newman, RH Scott (1996) Electrophysiological and ultrastructural events evoked by methacholine and intracellular photolysis of caged compounds in cultured ovine trachea submucosal gland cells. Exp Physiol 81: 27–43
De Sanctis GT, Rubin BK, Ramirez O, King M (1993) Ferret tracheal mucus rheology, clearability and volume following administration of substance P or methacholine. Eur Respir J 6: 76–82
Lundberg JM, Saria A (1982) Capsaicin-sensitive vagal neurons involved in control of vascular permeability in rat trachea. Acta Physiol Scand 115: 521–523
Belvisi MG, Barnes PJ, Rogers DF (1990) Neurogenic inflammation in the airways: characterisation of electrical parameters for vagus nerve stimulation in the guinea pig. J Neurosci Methods 32: 159–167
Webber SE, Widicombe JG (1989) The transport of albumin across the ferret in vitro whole trachea. J Physiol 408: 457–472
Price AM, Webber SE, Widdicombe JG (1990) Transport of albumin across the rabbit trachea in vitro. J Appl Physiol 68: 726–730
List SJ, Findlay BP, Forstner GG, Forstner JF (1978) Enhancement of the viscosity of mucin by serum albumin. Biochem J 175: 565–571
Yang CM, Farley JM, Dwyer TM (1988) Muscarinic stimulation of submucosal glands in swine trachea. J App/ Physiol 64: 200–209
Gater PR, Alabaster VA, Piper I (1989) A study of the muscarinic receptor subtype medi-ating mucus secretion in the cat trachea in vitro. Pulmonary Pharmacol 2: 87–92
Ishihara H, Shimura S, Satoh M, Masuda T, Nonaka H, Kase H, Sasaki T, Sasaki H, Takishima T, Tamura K (1992) Muscarinic receptor subtypes in feline tracheal submucosal gland secretion. Am J Physiol 262: L223–L228
Baraniuk JN (1991) Neural control of human nasal secretion. Pulmonary Pharmacol 4: 20–31
Widdicombe JG (1990) Nasal pathophysiology. Respir Med 84 (suppl A): 3–10
Baraniuk JN, Kaliner M (1991) Neuropeptides and nasal secretion. Am J Physiol 261: L223–L235
McDonald DM (1988) Neurogenic inflammation in the rat trachea. I. Changes in venules, leukocytes and epithelial cells. J Neurocytol 17: 583–603
Newman TTM, Robichaud A, Rogers DF (1996) Microanatomy of secretory granule release from guinea pig tracheal goblet cells. Am J Respir Cell Mol Biol 15: 529–539
Steel DM, Hanrahan JW (1997) Muscarinic-induced mucin secretion and intracellular signalling by hamster tracheal goblet cells. Am J Physiol 272: L230–L237
Kuo H-P, Rohde JAL, Barnes PJ, Rogers DF (1992) Cigarette smoke-induced airway goblet cell secretion: dose-dependent differential nerve activation. Am J Physiol 263: L161–L167
Hayes JP, Kuo H-P, Rohde JAL, Newman-Taylor AJ, Barnes PJ, Chung KF, Rogers DF (1995) Neurogenic goblet cell secretion and bronchoconstriction in guinea pigs sensitised to trimellitic anhydride. Eur J Pharmacol (Env Toxicol Pharmacol Section) 292: 127–134
Popovac, D., Chinn, R., Graf, P., Nadel, J. and Davis, B. (1979). Serotonin potentiates nervous stimulation of mucus gland secretion in canine trachea in vivo. Physiologist 22: 102 (abstract)
Shimura S, Sasaki T, Ishihara H, Sato M, Sasaki H, Takishima T (1992) Autonomic innervation to feline tracheal submucosal glands for mucus glycoprotein secretion. Am J Physiol 262: L15–L20
Yurdakos E, Webber SE (1991) Endothelin-1 inhibits prestimulated tracheal submucosal gland secretion and epithelial albumin transport. Br J Pharmacol 104: 1050–1056
Deffebach ME, Islami H, Price A, Webber SE, Widdicombe JG (1990) Prostaglandins alter methacholine-induced secretion in ferret in vitro trachea. Am J Physiol 258: L75–L80
Phipps RJ, Richardson PS (1976) The effects of irritation at various levels of the airway upon tracheal mucus secretion in the cat. J Physiol 261: 563–581
German VF, Ueki IF, Nadel JA (1980) Micropipette measurement of airway submucosal gland secretion: laryngeal reflex. Am Rev Respir Dis 122: 413–416
Peatfield AC, Richardson PS (1983) The action of dust in the airways on secretion into the trachea of the cat. J Physiol 342: 327–334
German VF, Corrales R, Ueki IF, Nadel JA (1982) Reflex stimulation of tracheal mucus gland secretion by gastric irritation in cats. J Appl Physiol 52: 1153–1155
Borison HL, Wang SC (1953) Physiology and pharmacology of vomiting. Pharmacol Rev 5: 193–230
Davis B, Chinn R, Gold J, Popovac D, Widdicombe JG, Nadel JA (1982) Hypoxaemia reflexly increases secretion from tracheal submucosal glands in dogs. J Appl Physiol 52: 1416–1419
Barnes PJ (1990) Muscarinic receptors in airways: recent developments. J Appl Physiol 68: 1777–1785
Lammers JW, Barnes PJ, Chung KF (1992) Nonadrenergic, noncholinergic airway inhibitory nerves. Eur Respir J 5: 239–246
Dey RD, Shannon Jr WA, Said SI (1981) Localization of VIP-immunoreactive nerves in airways and pulmonary vessels of dog, cat and human subjects. Cell Tissue Res 220: 231–238
Laitinen A, Partanen M, Hervonen A, Pelto-Huikko M, Laitinen LA (1985) VIP-like immunoreactive nerves in human respiratory tract: light and electronic microscopic study. Histochemistry 82: 313–319
Fischer AW, Hoffmann B (1996) Nitric oxide synthase in neurons and nerve fibers of lower airways and in vagal sensory ganglia of man. Am J Respir Crit Care Med 154: 209–216
Carstairs JR, Barnes PJ (1986) Visualisation of vasoactive intestinal peptide receptors in human and guinea pig lung. J Pharmacol Exp Tiler 239: 249–255
Liu Y-C, Patel HJ, Khawaja AM, Belvisi MG, Rogers DF (1999). Neuroregulation by vasoactive intestinal peptide (VIP) of mucus secretion in ferret trachea: activation of BKca channels and inhibition of neurotransmitter release. Br J Pharmacol 126: 147–158
Ghatei MA, Springall DR, Richards IM, Oostveen JA, Griffin RL, Cadieux A (1987) Regulatory peptides in respiratory tract of Macaca fascicularis. Thorax 42: 431–439
Lundberg JM, Fahrenkrug J, Hokfelt T, Martling CR, Larsson O, Tatemoto K (1984) Co-existence of peptide histidine isoleucine (PHI) and VIP in nerves regulating blood flow and bronchial smooth muscle tone in various mammals including man. Peptides 5: 593–606
Ramnarine SI, Khawaja AM, Barnes PJ, Rogers DF (1996) Nitric oxide inhibition of basal and neurogenic mucus secretion in ferret trachea in vitro. Br J Pharmacol 118: 998–1002
Ramnarine SI, Liu Y-C, Rogers DF (1998). Neuroregulation of mucus secretion by opioid receptors and KATP and BKca channels in ferret trachea in vitro. Br J Pharmacol 123: 1631–1638
Kuo H-P, Rohde JAL, Barnes PJ, Rogers DF (1992) Differential inhibitory effects of opi-oids on cigarette smoke, capsaicin and electrically-induced goblet cell secretion in guinea-pig trachea. Br J Pharmacol 105: 361–366
Kuo H-P, Rohde JAL, Barnes PJ, Rogers DF (1992) K+ channel inhibition of neurogenic goblet cell secretion in guinea pig trachea. Eur J Pharmacol 215: 297–299
Reid L (1954) Pathology of chronic bronchitis. Lancet i: 275–278
Sturgess J, Reid L (1973) The effects of isoprenaline and pilocarpine on (a) bronchial mucus-secreting tissues and (b) pancreas, salivary glands, heart, thymus, liver and spleen. Br J Exp Pathol 54: 388–403
Kleinerman J, Sorensen J, Rynbrandt D (1976) Chronic bronchitis in the cat produced by chronic methacholine administration. Am J Pathol 82: A48
Sturgess J, Reid L (1972) An organ culture study of the effect of drugs on the secretory activity of the human bronchial submucosal gland. Clin Sci 43: 533–543
Coles SJ, Said SI, Reid LM (1981) Inhibition by vasoactive intestinal peptide of glucoconjugate and lysozyme secretion by human airways in vitro. Am Rev Respir Dis 124: 531–536
Peatfield AC, Davies JR, Richardson PS (1986) The effect of tobacco smoke upon airway secretion in the cat. Clin Sci 71: 179–187
Koyama S, Rennard SI, Leikauf GD, Robbins RA (1991) Bronchial epithelial cells release monocyte chemotactic activity in response to smoke and endotoxin. J Immunol 147: 972–979
Robbins RA, Nelson KJ, Gossman GL, Koyama S, Rennard SI (1991) Complement activation by cigarette smoke. Am J Physiol 260: L254–L259
Houston JC, de Navasquez S, Trounce JR (1953) A clinical and pathological study of fatal cases of asthmaticus. Thorax 8: 207–213
Dunnill MS (1960) The pathology of asthma with special reference to changes in the bronchial mucosa. J Clin Pathol 13: 27–33
Dunnill MS (1975) The morphology of the airways in bronchial asthma. In: M Stein (ed): New directions in asthma. American College of Chest Physicians, Park Ridge, Illinois, 213–221
Ayala LE, Ahmed T (1989) Is there a loss of a protective muscarinic receptor mechanism in asthma? Chest 96: 1285–1291
Minette PAH, Lammers JWJ, Dixon CMS, McCusker MT, Barnes PJ (1989) A muscarinic agonist inhibits reflex bronchoconstriction in normal but not asthmatic subjects. J Appl Physiol 67: 2461–2465
Ollerenshaw S, Jarvis D, Woolcock A, Sullivan C, Scheibner T (1989) Absence of immunoreactive vasoactive intestinal polypeptide in tissue from the lungs of patients with asthma. New Engl J Med 320: 1244–1248
Howarth PH, Springall DR, Redington AE, Djukanovic R, Holgate ST, Polak JM (1995) Neuropeptide-containing nerves in endobronchial biopsies from asthmatic and nonasthmatic subjects. Am J Respir Cell Mol Biol 13: 288–296
Lilly CM, Bai TR, Shore SA, Hall AE, Drazen JM (1995) Neuropeptide content of lungs from asthmatic and nonasthmatic patients. Am J Respir Crit Care Med 151: 548–535
Cardell LO, Uddman R, Edvinsson L (1994) Low concentrations of VIP and elevated levels of other neuropeptides during exacerbations of asthma. Eur Respir J 7: 2169–2173
Sharma RK, Addis BJ, Jeffery PK (1995) The distribution and density of airway vasoactive intestinal polypeptide (VIP) binding sites in cystic fibrosis and asthma. Pulmonary Pharmacol 8: 91–96
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2001 Springer Basel AG
About this chapter
Cite this chapter
Rogers, D.F. (2001). Muscarinic control of airway mucus secretion. In: Zaagsma, J., Meurs, H., Roffel, A.F. (eds) Muscarinic Receptors in Airways Diseases. Progress in Inflammation Research. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8358-0_8
Download citation
DOI: https://doi.org/10.1007/978-3-0348-8358-0_8
Publisher Name: Birkhäuser, Basel
Print ISBN: 978-3-0348-9532-3
Online ISBN: 978-3-0348-8358-0
eBook Packages: Springer Book Archive