Amelogenins: Multifaceted Proteins for Dental and Bone Formation and Repair

The Non-Amelogenins: Ameloblastin and Enamelin

Author(s): Yong-Hee P. Chun, Jan C-C Hu, James P. Simmer

Pp: 42-55 (14)

DOI: 10.2174/978160805171711001010042

* (Excluding Mailing and Handling)

Abstract

Ameloblastin (AMBN) and enamelin (ENAM) are two of the 23 secretory calcium-binding phosphoprotein (SCPP) genes on human chromosome 4q. They are members of the proline and glutamine rich group. Both ameloblastin and enamelin function specifically during tooth formation, and probably both are only critical for dental enamel formation. Both genes have been shown to degenerate in mammals that have lost the ability to make dental enamel during evolution. In mice that cannot express functional ameloblastin or enamelin during tooth formation the mineralization front along the secretory portion of the ameloblast plasma membrane fails to generate enamel mineral ribbons. A non-functional mineral crust forms over dentin that readily abrades away when the teeth erupt into function. Ameloblasts undergo pathological changes, such as mineralization of the cell layer, disorganization, and apoptosis. In this chapter we review what is known about ameloblastin structure and function and conclude that enamelin and ameloblastin are both critical for the formation of enamel mineral ribbons during the secretory stage of amelogenesis and that their primary function is at the mineralization front.


Keywords: Enamel, Enamelin, Amelogenin, Ameloblastin, Amelogenesis Imperfecta, Biomineralization, Tooth Formation

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      • 13. app/Models/UserAccess/UserAccess.php:1266
      • 14. app/Http/Controllers/ChapterController.php:1518
      • 15. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Trial Access" as access_base_text, CASE j.type WHEN 111 THEN true ELSE false END as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_trail` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 51137665 and j.to_ip >=51137665 )) and ((j.from_date <= 1739835106 and j.to_date >= 1739835106 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 1467) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Subscribed" as access_base_text, false as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_corporate` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 51137665 and j.to_ip >=51137665 )) and ((j.from_date <= 1739835106 and j.to_date >= 1739835106 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 1467) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Token Based Access" as access_base_text, false as terms_popup, "R" as content_download_type, j.uc_id as restricted_user_access_key, "v" as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_token` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 51137665 and j.to_ip >=51137665 )) and ((j.from_date <= 1739835106 and j.to_date >= 1739835106 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 1467)
      520μsalphaeurekaselec_live_10_06_2022UserAccess.php#1266
      Backtrace
      • 13. app/Models/UserAccess/UserAccess.php:1266
      • 14. app/Http/Controllers/ChapterController.php:1549
      • 15. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • select b.banner_link, b.banner_name, b.banner_script, b.banner_remarks, b.banner_file_name, b.banner_placement, bd.content_type, bd.content_id from `tbl_banner` as `b` inner join `tbl_banner_detail` as `bd` on `bd`.`banner_id` = `b`.`banner_id` inner join `users` as `u` on `u`.`id` = `b`.`updated_by` where `b`.`banner_ebook` = 1 and `bd`.`content_type` = 'B' and `bd`.`content_id` = 899 and `b`.`banner_from_date` <= 1739835106 and `b`.`banner_to_date` >= 1739835106 and `b`.`banner_status` = 'A' order by `b`.`banner_id` desc
      1.03msalphaeurekaselec_live_10_06_2022Banner.php#95
      Bindings
      • 0: 1
      • 1: B
      • 2: 899
      • 3: 1739835106
      • 4: 1739835106
      • 5: A
      Backtrace
      • 13. app/Models/Banner.php:95
      • 14. app/Http/helpers.php:404
      • 17. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 18. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    • select count(*) as aggregate from `uc_cart_products` where cart_id='679407a074cc605d1ace3cdcf3b3510e'
      180μsalphaeurekaselec_live_10_06_2022Cart.php#271
      Backtrace
      • 15. app/Models/Cart.php:271
      • 16. view::layouts._header:260
      • 18. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 20. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    App\Models\Keywords
    7Keywords.php#?
    App\Models\Chapter
    1Chapter.php#?
    App\Models\Ebook
    1Ebook.php#?
        _token
        eeI9S2fSSwR2AUZOfvCR7GrLL5hsrgdgpJzhEjiE
        uc_cart_id
        679407a074cc605d1ace3cdcf3b3510e
        _previous
        array:1 [ "url" => "https://alpha.eurekaselect.com/chapter/1467" ]
        _flash
        array:2 [ "old" => [] "new" => [] ]
        PHPDEBUGBAR_STACK_DATA
        []
        path_info
        /chapter/1467
        status_code
        200
        
        status_text
        OK
        format
        html
        content_type
        text/html; charset=UTF-8
        request_query
        []
        
        request_request
        []
        
        request_headers
        0 of 0
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        request_cookies
        0 of 0
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        response_headers
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        ClearShow all
        Date ↕MethodURLData
        #12025-02-17 23:31:46GET/chapter/1467112199