| Sažetak | Vitamin D sekosteroidni je hormon koji se dijelom sintetizira u stanicama kože djelovanjem
ultravioletnih B sunčevih zraka (UVB), a dijelom se unosi prehranom. Kako bi se aktivirao,
najprije treba biti podvrgnut procesu hidroksilacije u jetri, a potom ponovno u bubrezima. Time
nastaje aktivni oblik vitamina D, 1,25-dihidroksikolekalciferol (1,25(OH)2D3), odnosno kalcitriol.
Ovako se pripremljen vitamin veže za poseban receptor vitamina D (VDR) čime postiže svoj
biološki učinak. Vitamin D ponajviše sudjeluje u homeostazi kalcija i fosfata čime igra veliku
ulogu u regulaciji muskuloskeletalnoga zdravlja. U posljednje se vrijeme osim koštanim
funkcijama važnost pridaje i novootkrivenim funkcijama vitamina D. Pokazalo se kako mnoge
stanice koje nisu povezane s homeostazom kalcija, također posjeduju membranske receptore koji
su potrebni za aktivaciju vitamina D. Tu ubrajamo T i B limfocite, maligne stanice, stanice kože,
placente gušterače, prostate i debeloga crijeva. Osim toga, potvrđen je doprinos vitamina D u
regulaciji kardiovaskularnoga zdravlja, u cijeljenju rana, u prevenciji karcinoma te u kvaliteti
imunološkoga odgovora. Mnoštvo literature ukazuje na povezanost između mineralne gustoće
kostiju (BMD) čeljusti i pojedinih parametara sistemske osteoporoze čime sugerira da
osteoporoza može biti faktor rizika za parodontnu bolest. Brojna epidemiološka istraživanja
pokazuju kako su ljudi danas izloženi znatno manjemu ultraljubičastomu zračenju potrebnom za
sintezu vitamina D te kako u organizam unose znatno manje kalcija, nego što su to činili ljudi u
prošlosti, stoga je deficijencija vitamina D postala gotovo svjetska epidemija koja za sobom
povlači višestruke kronične zdravstvene probleme. Također postoje dokazi o povezanosti
serumske razine vitamina D s povećanom upalom gingive što ide u prilog važnosti vitamina D u
parodontnome zdravlju o čemu će u ovome radu biti nešto više riječi. |
| Sažetak (engleski) | Vitamin D is a secosteroid hormone that is partly synthesized in skin cells by the action of
ultraviolet B sun rays (UVB), and is partly ingested through diet. In order to be activated, it must
first undergo a process of hydroxylation through the liver and then again in the kidneys. This
creates the active form of vitamin D, calcitriol, ie. 1,25-dihydroxycholecalciferol (1,25(OH)2D3).
The activated vitamin binds to a special vitamin D receptor (VDR), and in this way achieves its
biological effect. Vitamin D is mostly involved in the calcium and phosphate homeostasis, which
plays a major role in the regulation of musculoskeletal health. Recently, in addition to its skeletal
functions, importance has been given to the newly discovered functions of vitamin D. It has been
shown that many cells that are not associated with calcium homeostasis also possess membrane
receptors required for vitamin D activation. These include T and B lymphocytes, malignant cells,
skin cells, as well as placenta, pancreas, prostate, and colon cells. In addition, its contribution to
the regulation of cardiovascular health has been confirmed, as well as in the quality of the
immune response, in wound healing and even in cancer prevention. Its most famous role is
certainly to participate in bone remodeling. A large number of existing studies suggests a
correlation between jaw bone mineral density (BMD) and individual parameters of systemic
osteoporosis, suggesting that osteoporosis may be a risk factor for periodontal disease. Vitamin D
deficiency has become an almost global epidemic that entails multiple chronic health problems,
including cardiovascular and autoimmune diseases, hypertension, diabetes, and many different
types of cancer. There is also evidence of correlation between serum vitamin D levels and
increased gingival inflammation which supports the importance of vitamin D in periodontal
health which will be discussed in more detail in this publication. |
