1,25-Dihydroxyvitamin D3 production by human keratinocytes. Kinetics and regulation.

1,25-Dihydroxyvitamin D3 upregulates the phosphatidylinositol signaling pathway in human keratinocytes by increasing phospholipase C levels.

1,25-Dihydroxyvitamin D3 (1,25(OH)2D3) induces the differentiation of normal human keratinocytes, in part by increasing their basal intracellular calcium levels (Cai) over a period of hours. Agonists such as ATP acting through membrane receptors cause an immediate but transient increase in Cai accompanied by an increase in inositol trisphosphate (IP3). Treatment of keratinocytes for 24 h with 1...

Regulation of IL-1 family cytokines IL-1alpha, IL-1 receptor antagonist, and IL-18 by 1,25-dihydroxyvitamin D3 in primary keratinocytes.

IL-1 family cytokines are key mediators of inflammatory response. Excessive production of these cytokines by keratinocytes has been implicated in inflammatory and hyperproliferative skin diseases. Given the immunosuppressive role of 1,25-dihydroxyvitamin D(3) (1,25(OH)(2)D(3)) and its clinical application in treatment of psoriasis, we investigated the effect of 1,25(OH)(2)D(3) on the expression...

اثر هم افزایی کاربرد توأم زهر زنبور عسل و25،1- دی هیدروکسی ویتامینD3 برالقای تمایز رده ی سلولی سرطانی پرومیلوسیتی HL-60

Introduction & Objective: Acute promyelocytic leukemia (APL) is a kind of acute leukemia characterized by a balanced t (15, 17) translocation which fails to develop into mature cells and proliferate in an unregulated fashion. In the recent years, in addition to combinatoral chemotherapy to treat unmature cancerous cells, differentiation therapy by differentiating agents as a novel procedure ...

Regulation of IL-1 Family Cytokines IL-1 , IL-1 Receptor Antagonist, and IL-18 by 1,25-Dihydroxyvitamin D3 in Primary Keratinocytes

Human Prostate Cells Synthesize 1 , 25 - Dihydroxyvitamin D 3 from 25 - Hydroxyvitamin 3 ’

Epidemiological and laboratory data support a role for vitamin D in the growth and differentiation of human prostatic cells. These findings prompted us to ask whether prostatic cells could convert 25-hydroxyvitamin D3 (25-OH-D3), the major circulating metabolite of vitamin D3, to 1,25-dihydroxyvitamin D3 [1,25(OH)2D3J, the hormonally active metabolite, in a manner similar to cultured human kera...