p-Phenylenediamine (PPD) is a component of certain henna tattoo and hair dye formulations. Human exposure to PPD containing products is associated with the development of T-cell mediated allergic contact dermatitis. Antigen-specific T-cells from allergic contact dermatitis patients are activated with either PPD or Bandrowskis base (BB), the metabolized trimer of PPD. In non-allergic individuals...

1. Climbing fibre-mediated excitatory postsynaptic potentials (CF-EPSPs) or currents (CF-EPSCs) were recorded from Purkinje cells in rat cerebellar slices using the whole-cell recording technique. 2. Climbing fibre responses displayed prominent paired-pulse depression (PPD). In the current-clamp recording mode, PPD resulted in a decreased number of spikelets in the second complex spike of the p...

Postpartum depression (PPD) affects up to 19% of women, negatively impacting maternal and infant health. Reductions in plasma oxytocin levels have been associated with PPD and heritability studies have established a genetic contribution. Epigenetic regulation of the oxytocin receptor gene (OXTR) has been demonstrated and we hypothesized that individual epigenetic variability at OXTR may impact ...

Skin is the major target of allergic reactions to paraphenylenediamine (PPD). Such small molecules require activation to become immunogenic. The balance between activation and/or detoxification processes is critical for immunogenic potentials of compounds. Therefore, we investigated N-acetylation (NAT) capacities of human skin for PPD to gain a better understanding of its mechanisms of action. ...

One of the major constraints facing the large-scale production of cassava (Manihot esculenta) roots is the rapid postharvest physiological deterioration (PPD) that occurs within 72 h following harvest. One of the earliest recognized biochemical events during the initiation of PPD is a rapid burst of reactive oxygen species (ROS) accumulation. We have investigated the source of this oxidative bu...

The possibility of using BCG — a Mycobacterium bovis strain of attenuated virulence for PPD production instead of a virulent strain of M. bovis has been considered to avoid the biological risks involved in the procedure. The potency and specificity of a PPD tuberculin prepared from BCG was compared in guinea pigs with that of PPD produced from strain AN5 (two batches), a virulent strain of M. b...

20(S)-protopanaxadiol (PPD), one of the representative aglycones of ginsenosides, has a broad spectrum of pharmacological activities. Although phase I metabolism has been investigated extensively, information regarding phase II metabolism of this compound remains to be elucidated. Here, a glucuronidated metabolite of PPD in human liver microsomes (HLMs) and rat liver microsomes (RLMs) was unamb...

OBJECTIVES Understanding patients' preferences for place of death and supporting patients to achieve their wishes has become a priority. This study aims to: (1) examine preferences of patients referred to a specialist palliative care service; (2) determine whether preferences of those who have been admitted as hospice inpatients differ from those who have not; (3) identify reasons why preferred...

Para-phenylenediamine (PPD) is a major component of hair coloring and black henna products. Although it has been largely demonstrated that PPD induces allergic reactions and increases the risk of tumors in the kidney, liver, thyroid gland and urinary bladder, the effect on dermal papilla cells remains to be elucidated. Therefore, the current study evaluated the effects of PPD on growth, cell de...