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Interferon research abs 1 || Hemoglobin research abs || Stem cell research abs || Nucleic acid research abs || Herpes research abs || Bronchitis research abs || Schizophrenia research abs || Tuberculosis research abs || Pneumonia research abs || Constipation research abs || Laxative research abs || hair research abs || hair related research references

J Control Release. 1999 May 1;59(1):99-105.
Transdermal iontophoretic delivery of bovine insulin and monomeric human insulin analogue.

Kanikkannan N, Singh J, Ramarao P.

Department of Pharmaceutics, IT, Banaras Hindu University, Varanasi-221005, India. kanikkannaotmail.com

The present study was undertaken to explore the possibility of delivering bovine insulin in streptozocin (STZ)-induced diabetic rats by iontophoresis. Further, the effect of iontophoresis of monomeric human insulin analogue (r-DNA origin) on the plasma glucose level (PGL) of diabetic rats was studied. Iontophoresis of bovine insulin (10-200 IU/ml) was not effective in decreasing the PGL in untreated diabetic rats. Pretreatment of skin with oleic acid or menthol for 3 h followed by iontophoresis of bovine insulin also failed to produce a fall in PGL. Application of a depilatory cream for hair removal (24 h before the experiment), followed by iontophoresis of bovine insulin (10, 30 and 100 IU/ml) produced a concentration-dependent fall in PGL. Further, application of depilatory cream immediately before the experiment produced a substantial fall in PGL both by passive diffusion and iontophoresis. Depilatory cream might have drastically reduced the barrier function of skin such that conventional bovine insulin (dimer and hexamer) penetrates through the intact skin by iontophoresis and even by passive diffusion. Depilatory cream or the active components of depilatory cream may be useful as penetration enhancers for transdermal delivery of drugs especially macromolecules such as insulin. Iontophoresis of monomeric human insulin analogue (B9 Asp, B27 Glu) through intact skin (untreated) produced a significant fall in PGL in diabetic rats. Monomeric human insulin analogues which have low tendency to self aggregation may be promising candidates for the transdermal iontophoretic delivery of insulin.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10210726&dopt=Abstract

Plant Cell. 2003 Jan;15(1):285-92.
Unstable F-actin specifies the area and microtubule direction of cell expansion in Arabidopsis root hairs.

Ketelaar T, de Ruijter NC, Emons AM.

Laboratory of Plant Cell Biology, Department of Plant Sciences, Wageningen University, Arboretumlaan 4, 6703 BD Wageningen, The Netherlands.

Plant cells expand by exocytosis of wall material contained in Golgi-derived vesicles. We examined the role of local instability of the actin cytoskeleton in specifying the exocytosis site in Arabidopsis root hairs. During root hair growth, a specific actin cytoskeleton configuration is present in the cell's subapex, which consists of fine bundles of actin filaments that become more and more fine toward the apex, where they may be absent. Pulse application of low concentrations of the actin-depolymerizing drugs cytochalasin D and latrunculin A broadened growing root hair tips (i.e., they increased the area of cell expansion). Interestingly, recovery from cytochalasin D led to new growth in the original growth direction, whereas in the presence of oryzalin, a microtubule-depolymerizing drug, this direction was altered. Oryzalin alone, at the same concentration, had no influence on root hair elongation. These results represent an important step toward understanding the spatial and directional regulation of root hair growth.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12509537&dopt=Abstract

umail.umd.edu

Fishes, unlike most other vertebrate groups, continue to add sensory hair cells to their ears for much of their lives. However, it is not clear whether the addition ever stops or how the addition of sensory cells impacts hearing ability. In this article, we tested both questions using the zebrafish, Danio rerio. Our results not only have important implications for understanding the consequences of adding sensory receptors, but these results for normal zebrafish also serve as valuable baseline information for future studies of select mutations on the ear and hearing of this species. Our results show that hair cell production continues in uncrowded zebrafish up to 10 months of age (about one-third of a normal life span), but despite this addition there is no change in hearing sensitivity or bandwidth. Therefore, hearing is not related to the number of sensory cells in the ear in juvenile and adult animals. We also show that despite no net addition of hair cells after about 10 months, hair cells are still being produced, but at a lower rate, presumably to replace cells that are dying. Moreover, crowding of zebrafish has a marked impact on the growth of the fish and on the addition of sensory cells to the ear. We also demonstrate that fish size, not age, is a better indicator of developmental state of zebrafish.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12162367&dopt=Abstract

Hear Res. 1999 Feb;128(1-2):27-39.
Cisplatin ototoxicity and the possibly protective effect of alpha-melanocyte stimulating hormone.

Heijmen PS, Klis SF, De Groot JC, Smoorenburg GF.

Department of Otorhinolaryngology, University Hospital Utrecht, The Netherlands.

It is known that adrenocorticotrophic hormone (ACTH)-derived peptides, the so-called melanocortins, can reduce cisplatin-induced neurotoxicity. Recently, our group has found that cisplatin-induced ototoxicity can also be reduced or prevented by treatment with the synthetic melanocortin-like peptide, ORG 2766 (Hamers et al., 1994; De Groot et al., 1997). The present study was designed to investigate the possibly ameliorating effects of the physiologically more relevant naturally occurring neuropeptide alpha-melanocyte stimulating hormone (alpha-MSH) upon cisplatin ototoxicity and to compare its protective effects to those of ORG 2766. For eight consecutive days guinea pigs were treated with cisplatin at a concentration of either 1.5 mg/kg/day or 2 mg/kg/day. Animals were co-treated with either alpha-MSH (75 microg/kg/day), ORG 2766 (75 microg/kg/day), or a sham injection containing physiological saline. Electrocochleography and hair cell counts were performed. Treatment with 1.5 mg/kg/day cisplatin resulted in a large variability of the morphological and electrophysiological data, a variability that might have masked possible effects of ORG 2766 and alpha-MSH. Treatment with 2 mg/kg/day cisplatin caused less variable, severe reductions in the compound action potentials and cochlear microphonics combined with basal and middle-turn outer hair cell loss in five out of six animals. However, in the alpha-MSH co-treated groups, two out of six animals could be classified as normal, two animals as moderately affected and two animals as severely affected. In the ORG 2766 co-treated group we found three animals that were not affected and three animals that were severely affected. We conclude that the protective effects of alpha-MSH and ORG 2766 co-treatment are comparable and that alpha-MSH might be clinically useful in protecting against cisplatin-induced ototoxicity.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10082280&dopt=Abstract

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