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hair research abs
Contemp Top Lab Anim Sci. 2002 Sep;41(5):43-6.
Virucidal effects of rodent cage-cleaning practices on the viability of adenovirus vectors.
Porter JD, Lyons RM.
Genetic Therapy, Inc., 9 W. Watkins Mill Road, Gaithersburg, Maryland 20878, USA.
Human adenoviruses and adenoviral vectors are classified as Risk Group 2 agents and require BSL2 containment and practices. An additional consideration in using adenoviruses and viral vectors in laboratory animal studies is the possible transmission of these agents to other animals and/or personnel as a result of viral shedding in animal urine and feces. When handling BSL2 agents, cage-wash staff are required to wear appropriate personnel protective equipment, including scrubs, Tyvek suit, hair covering, dust mask, shoes covers, and gloves. Current decontamination procedures are to bag and autoclave soiled rodent cages containing bedding prior to washing in the cage washer to prevent possible adenoviral transmission. However, the practice of autoclaving softens the polycarbonate-based rodent cages, allowing damaging agents or conditions to affect the integrity of the plastic and degrade the cages. The objective of this study was to determine whether current rodent cage-cleaning practices produced virucidal effects for use in lieu of or prior to autoclaving the cages. We found that heating an Av3GFP vector in a test tube to a temperature of 74 degrees C (165 degrees F) for 6 min conditions equivalent to those of the cage washer resulted in greater than an 11-log reduction in infectivity of the vector as evaluated by its cytopathic effect on cells. The combination of heating and a liquid, phosphate-free alkaline detergent produced the same reduction in vector infectivity. However, common cage-cleaning solutions alone possessed no virucidal activity. The high temperatures used in cage-washing procedures alone or in combination with a cleaning solution reduced or eliminated the risk of transmission from viral shedding through urine and feces even at vector concentrations far greater than would ever be expected to be present. Autoclaving cages diminishes the stability and integrity of the polycarbonate cages without providing a further reduction in the risk of virus or vector transmission. On the basis of results from this study, new cage-wash recommendations include dumping the contaminated bedding into a HEPA-filtered waste disposal system and autoclaving the bags of bedding before disposal, then cleaning the cages in the rack washer at wash temperatures of 74 degrees C (165 F) and rinse temperatures of 82 degrees C (180 F).
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12213048&dopt=Abstract
Brain Res. 2002 Sep 13;949(1-2):1-10.
Avian brainstem neurogenesis is stimulated during cochlear hair cell regeneration.
Park DL, Girod DA, Durham D.
Department of Otolaryngology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA. dparumc.edu
Unlike mammals, adult avians are able to regenerate cochlear sensory hair cells following injury. Brainstem auditory neurons in chicken nucleus magnocellularis (NM), which receive their sole excitatory afferent input from the cochlea, were examined for evidence of mitosis during ototoxin-induced loss and regeneration of cochlear hair cells. Using tritiated thymidine as a mitotic marker in tissue processed for autoradiography and counterstained with thionin, labeled NM neurons and glia were counted from chickens killed 16 days after gentamicin or saline injections. Newly generated NM neurons were observed during cochlear hair cell regeneration. More labeled neurons were observed in the experimental chickens, but a few were also seen in the control chickens. We predicted labeled NM neurons would be found solely in the rostral high frequency region, given the gentamicin-induced high frequency cochlear hair cell loss and regeneration. However, the labeled NM neurons were located throughout the tonotopic axis of the nucleus. The total number of labeled neurons was lower than predicted. Many labeled NM glia were observed in experimental and control chickens. Labeled cells were also observed throughout the chicken brainstem and cerebellum in both experimental and control chickens, indicating great potential for CNS plasticity. Results in NM indicate the avian auditory system is capable of regenerating brainstem auditory neurons in addition to the previously well-established capability of regenerating cochlear hair cells in response to ototoxic injury. Recovery of both central and peripheral auditory components will be necessary to restore hearing damaged by noise or ototoxic drugs. 2002 Elsevier Science B.V.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12213294&dopt=Abstract
Mol Cell Neurosci. 2002 Aug;20(4):695-711.
The alpha9/alpha10-containing nicotinic ACh receptor is directly modulated by opioid peptides, endomorphin-1, and dynorphin B, proposed efferent cotransmitters in the inner ear.
Lioudyno MI, Verbitsky M, Glowatzki E, Holt JC, Boulter J, Zadina JE, Elgoyhen AB, Guth PS.
Department of Pharmacology, Tulane University, New Orleans, Louisiana 70112, USA. lioudynme.jhu.edu
Opioid peptides have been detected in the auditory and vestibular efferent neurons where they colocalize with the major neurotransmitter, acetylcholine. We investigated the function of opioids to modulate neurotransmission mediated by hair cell's alpha9/alpha10-containing nicotinic acetylcholine receptors (alpha9/alpha10nAChRs). The endogenous opioid peptides, endomorphin-1 (mu agonist) and dynorphin B (kappa agonist), but not a delta agonist [D-Pen2,D-Pen-5]enkephalin, inhibited the acetylcholine-evoked currents in frog saccular hair cells and rat inner hair cells. This inhibition was noncompetitive, voltage-independent, and was accompanied by an acceleration of the rate of current decay. Selective mu- and kappa-opioid receptor antagonists did not block the inhibition, although partial reduction by naloxone was observed. All opioid antagonists tested also reduced the acetylcholine response. Endomorphin-1 and dynorphin B inhibited the acetylcholine-evoked currents in alpha9/alpha10-expressing Xenopus oocytes. Because oocytes lack opioid receptors, it provides strong evidence for the direct interaction of opioid peptides with alpha9/alpha10nAChR. CONCLUSION: alpha9/alpha10nAChR is a target for modulation by endomorphin-1 and dynorphin B, efferent cotransmitters in the inner ear.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12213449&dopt=Abstract
Eur J Endocrinol. 2002 Sep;147(3):357-61.
An endocrinopathy characterized by dysfunction of the pituitary-adrenal axis and alopecia universalis: supporting the entity of a triple H syndrome.
Ichiki K, Nakamura T, Fujita N, Honda K, Hiraga T, Ishibashi S, Ishikawa S.
Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical School, Tochigi 329-0498, Japan.
We demonstrate the rare disorder of triple H syndrome in a 25-year-old man. He was pointed out as having short stature, at -5.9 s.d., and diagnosed as GH deficient at 6 years old. Approximately a year ago, he noticed systematic hair loss. He lost body weight by 7 kg during the last half year. He was admitted to Jichi Medical School Hospital because of unconsciousness. Physical findings showed disturbance of consciousness with Japan Coma Scale I-3. He had emaciation and alopecia universalis. Laboratory findings showed plasma glucose was as low as 1.11 mmol/l. GH and ACTH deficiency with hypoadrenocorticism were clarified. His intelligence was in the low normal range with a WAIS IQ of 70, and anterograde amnesia was suggested in the presence of a little, but not significant, morphological change in the hippocampus on a magnetic resonance imaging scan. Replacement by a physiological dose of hydrocortisone normalized plasma glucose, and restored body weight and growth of hair during the 7 month therapeutic period. The present finding strongly supports a clinical entity of triple H syndrome, including ACTH deficiency, alopecia universalis and anterograde amnesia, and that there may be some variation of the triad among the subjects.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12213673&dopt=Abstract
Like developmental biology of any part of our body, hair growth is a complicated process. Hence the homework for
modern science to yet unravel the process and mechanism to a completion. There exist a number of traditional and alternative therapeutic methods that include drugs, surgery, suppelements, and even snake oils that have been developed and used for those who lose hair.
No understanding, and there is no solution. Of course, none of these approaches are perfect for all hair loss problems, especially due to the heterogeneity of the causes underlying hair losses. Most of chemical drugs and hair transplantation surgeries are accompanied by undesirable side effects.
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