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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






Acta Otolaryngol Suppl. 1998;539:28-33.
Thimerosal-induced Ca2+ mobilization in isolated guinea pig cochlear outer hair cells.

Chen L, Harada N, Yamashita T.

Department of Otolaryngology, Kansai Medical University, Osaka, Japan.

Intracellular calcium mobilization of isolated guinea pig cochlear outer hair cells (OHCs) was investigated using thimerosal, a -SH group oxidizing agent, and fura-2 fluorescence ratio imaging microscopy. In the presence of thimerosal, intracellular Ca2+ concentrations ([Ca2+]i) of OHCs were elevated in a dose-dependent manner. Even in Ca(2+)-free medium, Ca2+ response was still induced. The effects of thimerosal on [Ca2+]i were completely blocked and reversed by dithiothreiotol (DTT). Neither 1-100 microM ryanodine nor 5-20 mM caffeine altered the effects of thimerosal. Pretreatment with pertussis toxin (PTX) for 30 min did not affect the thimerosal-induced increase in [Ca2+]i. The increase in [Ca2+]i when Ca2+ was added during thimerosal application in Ca(2+)-free medium was almost completely blocked by 500 microM LaCl3, while nifedipine did not inhibit further increase in [Ca2+]i caused by thimerosal. Thus, oxidation of the -SH group of the OHC membrane can induce a Ca2+ release from intracellular Ca2+ stores, which are ryanodine- and caffeine-insensitive, and Ca2+ influx through non-specific Ca2+ channels, but not the nifedipine-sensitive Ca2+ channels. The possible oxidation of -SH group gated Ca2+ channels in OHCs is worthy of further study.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10095857&dopt=Abstract



Hear Res. 2002 Jul;169(1-2):1-12.
Fibroblast growth factors (FGFs) in the cochlear nucleus of the adult mouse following acoustic overstimulation.

Smith L, Gross J, Morest DK.

Department of Neuroscience, The University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030-3401, USA.

To see if fibroblast growth factors (FGFs) might function in the central changes following auditory overstimulation we tracked immunostaining in the cochlear nucleus of adult mice with monoclonal antibodies to FGFs (FGF-1, FGF-2) and FGF receptor. After exposure nearly all outer hair cells died, while inner hair cell and fiber loss were restricted to a region midway along the cochlear spiral. FGFs staining in the cochlear nucleus appeared in hypertrophied astrocytes in the regions of nerve fiber degeneration only. For normal-sized astrocytes there was an increase in the number stained and the intensity of staining across all frequency domains, but not in neurons. The increases were modest at 3-7 days, pronounced at 14 days, modest again by 30 days, and back to control levels by 60 days. FGF receptor staining of neurons occurred equally in all mice, exposed or not. The findings suggest that astrocytes play a role in the central responses to acoustic overstimulation and cochlear damage, involving FGFs, possibly regulating the activity of intrinsic neurons or signaling axonal growth. Not limited to regions of cochlear nerve fiber and inner hair cell loss, the changes in FGFs may represent a reaction to outer hair cell damage which spreads broadly across the central pathways.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12121735&dopt=Abstract



Brain Res Mol Brain Res. 2002 Sep 30;105(1-2):98-107.
Expression of members of Wnt and Frizzled gene families in the postnatal rat cochlea.

Daudet N, Ripoll C, Moles JP, Rebillard G.

INSERM U254, Universite Montpellier I, Montpellier, France. nicolas.daudeancer.org.uk

The functioning of the mammalian cochlea is entirely based on its mechanical properties, which are supported by a highly complex tissue architecture resulting from the precise arrangement of sensory hair cells and non-sensory supporting cells. Growing evidence indicates that evolutionary conserved signaling pathways are involved in inner ear development and in the differentiation of its diverse cell types. We investigated whether members of the Wnt and Frizzled gene families, which play key roles in a wide variety of cellular and developmental processes, are expressed in the postnatal rat cochlea. A PCR screening of a rat cochlea cDNA library performed with degenerate primers allowed us to isolate five members of the Wnt gene family (RWnt-2B, -4, -5A, -5B, and -7A) and six members of the Frizzled gene family (Rfz1, Rfz2, Rfz3, Rfz4, Rfz6, Rfz9). In situ hybridization and immunocytochemistry experiments demonstrated that RWnt-4, -5B, -7A have distinct, although partly overlapping, expression patterns in the juvenile rat cochlea. These results suggest that the Wnt-Frizzled signaling pathway could be involved in several aspects of late cochlear differentiation and/or auditory function. 2002 Elsevier Science B.V.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12399112&dopt=Abstract



J Refract Surg. 2002 Sep-Oct;18(5):524-8.
Effect of volatile compounds on excimer laser power delivery.

Van Horn SD, Hovanesian JA, Maloney RK.

Jules Stein Eye Institute, UCLA School of Medicine, Los Angeles, CA, USA.

PURPOSE: To determine whether vapors from perfume, hairspray, oil-based paint, or water-based paint affect excimer laser beam power delivery at the corneal surface. METHODS: We measured the power delivery of an Apex Plus laser before, during, and after exposure to vapors from the following volatile compounds: three types of perfume, hair spray, an oil-based paint, and a water-based paint. A digital calorimeter was used to measure the steady-state beam power of the laser during laser discharge at the corneal plane. Multiple trials were run with each compound, and the change in laser energy over time was examined to determine if any of the compounds caused degradation of the laser optics. RESULTS: The presence of a volatile compound in the room caused no change in mean laser energy in comparison to before and after the compound was present. However, perfumes caused a progressive decline in laser beam power throughout the trials. Controlling for this progressive decline, there was no significant difference from perfume to perfume. CONCLUSIONS: None of the compounds tested caused a decline in laser beam power while present in the room. However, the presence of any perfume caused a deterioration in beam power over time, suggesting a degradation of the laser optics for all perfumes. Laser centers should consider advising their patients and staff to not wear perfumes in the laser suite.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12361152&dopt=Abstract








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