Amelogenins: Multifaceted Proteins for Dental and Bone Formation and Repair

Amelogenins: A Review of Formative and Degradative Aspects, and Transgene Expression in Bone Cells

Author(s): Rima Wazen, Sylvia Francis Zalzal, Antonio Nanci

Pp: 32-41 (10)

DOI: 10.2174/978160805171711001010032

* (Excluding Mailing and Handling)

Abstract

The cells that form calcified tissues produce various matrix proteins that foster a favourable environment for the regulated and structured deposition of calcium and phosphate ions into a carbonated form of apatite mineral. Differing from collagen-based calcified tissues, the organic matrix of enamel is produced by epithelially-derived cells – the ameloblasts, and consists of two major classes of proteins, amelogenins (AMEL) and nonamelogenins [1]. The AMEL class comprises full-length proteins, truncated isoforms resulting from alternative mRNA splicing, and fragments generated by extracellular proteolytic processing [1]. Enamel is distinctive from other calcified tissues because its organic matrix must ultimately be almost totally removed for it to achieve its full mineralization status. Thus, amelogenesis involves both formative and degradative processes. Studies over the past few years have revealed unexpected potentials for AMEL beyond structuring and organizing mineral at the surface of teeth, in particular their apparent capacity to influence osteogenic events. The objective of this mini-review is to highlight some key features of AMEL as related to both processes, and briefly go over our efforts to introduce enamel protein transgenes in bone forming cells.


Keywords: Amelogenins, Ameloblasts, Secretion, Degradation, Dental Mineralization, Bone 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 = 1465) 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 = 1465) 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 = 1465)
      530μsalphaeurekaselec_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'
      210μsalphaeurekaselec_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
    6Keywords.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/1465" ]
        _flash
        array:2 [ "old" => [] "new" => [] ]
        PHPDEBUGBAR_STACK_DATA
        []
        path_info
        /chapter/1465
        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/1465112198