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Systematic studies invalidate the neonatally androgenized rat as a model for polycystic ovary disease 总被引:2,自引:0,他引:2
As an adult, the neonatally androgenized (AZ) rat is anovulatory and exhibits follicular cysts. Thus, the AZ rat has been used as a model for polycystic ovary disease (PCO). However, its correlation with the human disease is not clear; so we have studied the AZ rat to determine its suitability as a PCO model. In Experiment I, reproductive hormones were measured at specific intervals between postnatal Days 15 and 90 in saline-treated and AZ rats. In Experiment II, AZ rats were treated with exogenous follicle-stimulating hormone (FSH) or subjected to unilateral ovariectomy (ULO) as analogies to therapies that have been used to treat human PCO. The results demonstrate that the luteinizing hormone (LH), FSH, testosterone (T), and estradiol (E2) concentrations of the AZ rat were not different from control values. Additionally, FSH therapy did not increase the E2 concentrations or the ovarian weight of the AZ rat. Furthermore, control and AZ rats exhibited similar post-ULO rises in FSH, but compensatory ovarian hypertrophy was not evident in the AZ rat. We conclude that 1) the hormonal and morphological patterns observed in the AZ rat do not correlate with those of PCO and 2) the androgenized rat does not provide an adequate model to study PCO. 相似文献
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J. H. Sheldrick S. A. Vernon A. Wilson S. J. Read 《BMJ (Clinical research ed.)》1992,305(6859):933-936
OBJECTIVES--To estimate demand incidence and episode rates of ophthalmic disease in a defined urban population over one year. DESIGN--Study of patients presenting with eye problems to general practice and eye casualty department. SETTING--General practice and ophthalmic services in west Nottingham. SUBJECTS--36,018 people from the combined practice lists of 17 Nottingham general practitioners. MAIN OUTCOME MEASURES--Ophthalmic disorder, age and sex of patient, and where presented. RESULTS--587 consultations were recorded for ophthalmic problems, 1771 with general practitioners and 816 with eye casualty. Most consultations to general practice were by females (1066 (60%)), whereas men aged 15-44 accounted for most work in eye casualty. These men commonly presented with trauma. Infective conjunctivitis, the commonest condition, had an episode rate of 13.5/1000 population/year. Demand incidence for cataracts was 1.9/1000 population/year. Demand incidence for chronic conditions increased with age. CONCLUSIONS--As the average age of the population increases demand for ophthalmic services will rise. Planning and provision of resources to meet this increased demand should be considered now. 相似文献
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Anil K. Ghosh Martin Devenport Deepa Jethwaney Dario E. Kalume Akhilesh Pandey Vernon E. Anderson Ali A. Sultan Nirbhay Kumar Marcelo Jacobs-Lorena 《PLoS pathogens》2009,5(1)
SM1 is a twelve-amino-acid peptide that binds tightly to the Anopheles salivary gland and inhibits its invasion by Plasmodium sporozoites. By use of UV-crosslinking experiments between the peptide and its salivary gland target protein, we have identified the Anopheles salivary protein, saglin, as the receptor for SM1. Furthermore, by use of an anti-SM1 antibody, we have determined that the peptide is a mimotope of the Plasmodium sporozoite Thrombospondin Related Anonymous Protein (TRAP). TRAP binds to saglin with high specificity. Point mutations in TRAP''s binding domain A abrogate binding, and binding is competed for by the SM1 peptide. Importantly, in vivo down-regulation of saglin expression results in strong inhibition of salivary gland invasion. Together, the results suggest that saglin/TRAP interaction is crucial for salivary gland invasion by Plasmodium sporozoites. 相似文献
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Benedict de Spinoza, C.S. Peirce, and Gilles Deleuze delineate a trajectory through the history of ideas in the dialogue about the potentials and limitations of panpsychism, the view that world is fundamentally made up of mind. As a parallel trajectory to the panpsychism debate in contemporary philosophy of mind and cognitive psychology, this approach can inform and enrich the discussion of the role and scope of mind in the natural world. The philosophies of mind developed by Deleuze and Peirce are Spinozistic in their natural monism but move beyond Spinoza to explain mind as a part of the natural world in semiotic terms. 相似文献