The Potential Effect of Henna (Stone Dye) Extract Paraphenylenediamine on Human Blood Cells, Liver and Renal Function

Some of the dyes that are used for coloring hair and skin contain a chemical compound called paraphenylenediamine (PPD), which is potentially toxic. The study comprised 50 adult Sudanese women who were selected by stratified random sampling and working as henna artist. Urine samples were taken for detection of PPD while blood samples were taken for investigating kidney and liver functions by measuring its relevant hematological indices. In other hand Thin Layer Chromatography (TLC) and High Performance Liquid Chromatography (HPLC) were used to detection of PPD in black henna (stone dye) samples and urine. The PPD was detected in the urine of all women who used the black henna its concentration varied according to duration of exposure being significantly higher in those with >10 years of exposure (p≤0.01). Similarly significant changes in liver function, kidney function and hematological indices were found in the group of women who used natural henna. This study concluded that natural henna is safe to use, while Black dye is potentially hazardous. It contains the high concentration of PPD, is the one most commonly associated with adverse effects.

Does low mercury containing skin-lightening cream (fair & lovely) affect the kidney, liver, and brain of female mice?

Fair & Lovely is an over-the-counter skin-lightening cream sold widely in Saudi markets. Its mercury content is 0.304+/-0.316 microg/g, in the range of 0.102 to 0.775 microg/g. This study was designed to evaluate its toxic effects on mice. The cream was applied on mice for a period of 1 month at different intervals. Mercury levels were measured in the liver, kidney, and brain tissue samples of a total of 75 adult female CD1 mice by Atomic Absorption Spectrophotometer coupled to a Vapor Generator Accessory. The mean mercury concentrations in the tissues of the treated mice were 0.193+/-0.319 microg/g; whereas for the control group, it was 0.041 microg/g+/-0.041microg/g. While the kidney was found to have the highest mercury content, the brain was found to have the lowest content. Treated mice showed a significant reduction in body weight. Marked histological changes were clearly noted in the kidney and, to a lesser extent, in the brain and liver. These results indicate that although Fair & Lovely mercury content is less than the U.S. Food and Drug Administration (FDA) permissible limits histopathological changes in the brain, kidney, and liver tissues are evidence of its possible toxicity.

Comparison of mercury levels in various tissues of albino and pigmented mice treated with two different brands of mercury skin-lightening creams

The use of mercury containing skin-lightening creams are becoming increasingly popular among dark-skinned women. The long-term use of certain brands may cause serious health effects over the years. In the present study, we investigated the dermal absorption of mercury and its accumulation in the tissues of albino and pigmented mice treated with two brands of mercury containing skin-lightening creams for a period of one months at different intervals. The mean +/- SD of mercury in the selected brands were: (1) Fair & Lovely (0.304 +/- 0.316 microg/g); and (2) Rose (77513.0 +/- 71063.0 microg/g). Mercury levels were measured in a total of 133 and 144 liver, kidney and brain tissue samples of albino and pigmented mice respectively by the Atomic Absorption Spectrophotometer coupled to Vapour Generator Accessory. In both strains, we found that the mercury concentration in the tissues of mice treated with Rose skin-lightening cream samples was significantly higher than those treated with Fair & Lovely skin lightening cream. Looking at the mercury concentration in the tissue samples with respect to the application of skin lightening creams at different intervals, the highest mercury concentrations were found in the tissues of albino and pigmented mice treated three times a day. On the other hand, the lowest mercury concentrations were found in the tissues of mice treated once a week. Despite the brand of skin-lightening cream that was applied, the study indicated that mercury was readily absorbed through the skin of both albino and pigmented mice as evidenced with its accumulation in the brain, kidney and liver tissues where the kidney had the highest mercury content and brain had the lowest (it P < 0.0001). Significant differences in the mercury levels were observed between the albino and pigmented mice. This emphasizes the protective role of melanin against mercury toxicity. Results of this study stresses the potential harm of these mercury containing skin-lightening creams regardless of their mercury contents especially for women who apply these creams frequently or for extended periods. Permanent nephrological or/and neurological deficits may occur if the damage is severe and diagnosis and treatment are delayed.

Histopathological Effects of Mercury in Skin-Lightening Cream

Rose skin-lightening cream with a mercury content of 77,513 +/- 71,063 ppm was selected and applied on mice for a period of 1 month at different intervals. Mercury levels were measured in a total of 58 liver, kidney, and brain tissue samples by atomic absorption spectrophotometer coupled to vapor generator accessory. The mean mercury concentration in the tissues of treated mice was 67,472 +/- 70,181 microg/g in the range of 0.391-288.759 microg/g. Looking at the mercury concentration in the tissue samples with respect to the application of skin lightening creams at different intervals, the highest mercury concentrations were found in the tissues of mice treated 3 times a day (116.806 +/- 83.182 microg/g, ranges 5.989-288.759 microg/g). On the other hand, the lowest mercury concentrations were found in the tissues of mice treated once a week (16.450 +/- 26.168 microg/g, ranges 0.391-95.642 microg/g). Histopathological changes were clearly seen in the brain, kidney, and liver sections of all treated mice. The severity of pathological changes observed in tissues increased with increasing the number of applications. It is evident that repeated application of Rose skin-lightening creams could induce permanent damage to the kidneys, brain, and liver. This study emphasizes the potential toxicity of mercury skin-lighting creams and the importance of discontinuing their manufacture and use.

Carcinogens induce reversion of the mouse pink-eyed unstable mutation

Deletions and other genome rearrangements are associated with carcinogenesis and inheritable diseases. The pink-eyed unstable (pun) mutation in the mouse is caused by duplication of a 70-kb internal fragment of the p gene. Spontaneous reversion events in homozygous pun/pun mice occur through deletion of a duplicated sequence. Reversion events in premelanocytes in the mouse embryo detected as black spots on the gray fur of the offspring were inducible by the carcinogen x-rays, ethyl methanesulfonate, methyl methanesulfonate, ethyl nitrosourea, benzo[a]pyrene, trichloroethylene, benzene, and sodium arsenate. The latter three carcinogens are not detectable with several in vitro or in vivo mutagenesis assays. We studied the molecular mechanism of the carcinogen-induced reversion events by cDNA analysis using reverse transcriptase-PCR method and identified the induced reversion events as deletions. DNA deletion assays may be sensitive indicators for carcinogen exposure.

Reversion of the mouse pink-eyed unstable mutation induced by low doses of x-rays

Deletions and other genome rearrangements can be caused by radiation and are associated with carcinogenesis and inheritable diseases. The pink-eyed unstable (p(un)) mutation in the mouse is caused by a gene duplication and reverts to wild type by deletion of one copy. Reversion events in the mouse embryo were detected as black spots on the fur of the animals or microscopically as partially black hair in a background of colorless hair. The frequency of partially black hair was increased by x-rays at very low doses. A linear dose-response relation was found between 1 and 100 centigray.