Browsing by Author "Sackey, S. T"

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Prevalence of human papillomavirus genotypes among women with cervical cancer in Ghana
(2016-01-26) Awua, A. K; Sackey, S. T; Osei, Y. D; Asmah, R. H; Wiredu, E. K
Abstract Background Human Papillomavirus (HPV) infections have been shown to be a necessary risk factor for the development of cervical cancer. However, HPV genotype distribution varies geographically, both in type and relative prevalence. In order to ensure a successful introduction of available vaccines, there is the need to identify pre-vaccination HPV genotype prevalence in Ghana and the extent of single and multiple-infections. Methods Paraffin-embedded cervical tissues of 256 confirmed cervical cancer cases diagnosed at the Korle-Bu Teaching Hospital during the period January 2004 to December 2006 were selected after hematoxylin and eosin staining and confirmation. Following a heat-proteinase K-based tissue lysis, HPV was detected and typed by a nested-multiplex PCR assay using an E6/E7 consensus primer and type-specific primers. Results Of the 256 cases, 230 (89.8 %, 95 % CI 85.7–93.4 %) were positive for HPV DNA. HPV18 (47.4 %), HPV59 (42.2 %), HPV45 (37.4 %) and HPV16 (9.0 %) were the four common HPV genotypes detected. A total of 110 (47.8 %) of the 230 HPV DNA positive tissues, were infected by a single HPV genotype while the other 120 (52.2 %) were infected by multiple HPV genotypes. A significant association was determined between each of the following HPV genotypes and multiple-infection; HPV18 (OR = 6.97; 95 % CI, 3.89–12.50), HPV59 (OR = 9.56; 95 % CI, 5.57–20.02) and HPV45 (OR = 1.94; 95 % CI, 1.12–3.35). Conclusion The prevalence of the following high risk HPV genotypes (HPV18, HPV59, HPV45) were relatively high among the cases of cervical cancers reported at this hospital in Ghana during the study period. Additionally, there was a high frequency of HPV multiple-infections among these cases.
Proteolytic Activity In Adult Haemonchus Contortos
(University of Ghana, 1982) Sackey, S. T; Oduro, K.K.; University of Ghana, College of Basic and Applied Sciences, School of Biological Sciences, Department of Biochemistry, Cell and Molecular Biology
Proteolytic activity of the JQ.qOOxgsupernate of homegenates ef adult Haemonchus contortus has been studied with respect to substrates susceptible to its proteolytic activity, and the effects of factors such as temperature, pH, substrate concentration, extract concentration, dibasic metal ions, detergents, heat and some specific inhibitors of proteolytic activity. The supernate had two pH optima, 5.6 with haemoglobii as substrate, and 7.8 using L-alanyl - p-nitroanilide. It showed optimum activity at 36°C, was heat labile and in general was not significantly affected by the presence of metal ions in the hydrolysis of haemoglobin and L-alanyl p-nitroanilide. In screening for substrates susceptible to its hydrolytic action the most suitable were found to be those p-nitroanilides and jp-naphthylamides which have a single amino acid group (small R-group), unprotected at the free functional group end. The kinetic studies indicated that haemoglobin was more rfeadily hydrolysed than the p-nitroanilides and p-naphthylamides.