BK channels sustain neuronal Ca2+ oscillations to support hippocampal long-term potentiation and memory formation.

Mutations of large conductance Ca2+- and voltage-activated K+ channels (BK) are associated with cognitive impairment. Here we report that CA1 pyramidal neuron-specific conditional BK knock-out (cKO) mice display normal locomotor and anxiety behavior. They do, however, exhibit impaired memory acquisition and retrieval in the Morris Water Maze (MWM) when compared to littermate controls (CTRL). In line with cognitive impairment in vivo, electrical and chemical long-term potentiation (LTP) in cKO brain slices were impaired in vitro. We further used a genetically encoded fluorescent K+ biosensor and a Ca2+-sensitive probe to observe cultured hippocampal neurons during chemical LTP (cLTP) induction. cLTP massively reduced intracellular K+ concentration ([K+]i) while elevating L-Type Ca2+ channel- and NMDA receptor-dependent Ca2+ oscillation frequencies. Both, [K+]i decrease and Ca2+ oscillation frequency increase were absent after pharmacological BK inhibition or in cells lacking BK. Our data suggest that L-Type- and NMDAR-dependent BK-mediated K+ outflow significantly contributes to hippocampal LTP, as well as learning and memory.

Charge Transport by Light-Activated Rhodopsins Determined by Electrophysiological Recordings.

Electrophysiological experiments are required to determine the ion transport properties of light-activated currents from microbial rhodopsin expressing cells. The recordings set the quantitative basis for correlation with spectroscopic data and for understanding of channel gating, ion transport vectoriality, or ion selectivity. This chapter focuses on voltage-clamp recordings of channelrhodopsin-2-expressing cells, and it will describe different illumination protocols that reveal the kinetic properties of gating. While the opening and closing reaction is determined from a single turnover upon a short laser flash, desensitization of the light-gated currents is studied under continuous illumination. Recovery from the desensitized state is probed after prolonged illumination with a subsequent light activation upon different dark intervals. Compiling the experimental data will define a minimum number of states in kinetic schemes used to describe the light-gated currents in channelrhodopsins, and emphasis will be given on how to correlate the results with the different time-resolved spectroscopic experiments.

Prevalence and factors associated with early initiation of breastfeeding among women in Moshi municipal, northern Tanzania.

BACKGROUND: Early initiation of breastfeeding (EIBF) is a predetermining factor for exclusive breastfeeding, and thus a foundation for optimal breastfeeding practices. Rates of EIBF are low globally (42%) and in Tanzania (51%), yet few studies have been done on this issue in Tanzania. This study aimed to determine the prevalence and factors associated with early initiation of breastfeeding among women in northern Tanzania. METHODOLOGY: This study extracted information from a cohort of 536 women who were followed from 3rd trimester period October 2013 to December 2015 in Moshi municipal, northern Tanzania. The data for this paper was collected by the use of questionnaires at enrolment, delivery and 7 days after delivery. The analysis is based on data from 413 women for whom complete information was obtained. Log binomial regression analysis was used to determine factors associated with early initiation of breastfeeding. RESULTS: The prevalence of EIBF was 83%. Overall, women had high knowledge on colostrum (94%), knowledge on exclusive breastfeeding (81%) and time of breastfeeding initiation (71%), but only 54% were counseled on breastfeeding during antenatal care. Knowledge on timely initiation of breastfeeding during pregnancy and vaginal delivery were associated with EIBF. CONCLUSION: Early initiation of breastfeeding is high (83%) in Moshi Municipal but still below the universal coverage recommended by WHO and UNICEF. There is missed opportunity by health facilities to counsel and support early initiation of breastfeeding given high antenatal and facility delivery in this setting. There is a need to evaluate health facility bottle necks to optimal support of early initiation of breastfeeding in Tanzania.

Exclusive Breastfeeding Rates and Factors Associated with Exclusive Breastfeeding Practices in Northern Tanzania: Measurement using Two Different Methodologies-24 Hours Recall and Recall Since Birth.

BACKGROUND: Exclusive breastfeeding (EBF) has many benefits to the child from mental to physical growth and development; however, methods of measuring EBF have raised a number of policy and programmatic questions. This study assesses EBF rates and factors associated with EBF practices in Northern Tanzania using two different methodologies, namely, the 24-hours recall and recall-since-birth. METHODS: A cohort study was conducted from October 2013 to December 2015 among mother-infants' pairs. Mothers with child delivery information (N=430) were followed and included in the analyses. We enrolled pregnant women who were in their third trimesters and interviewed them with the help of questionnaires at enrollment, delivery, 7 days and thereafter monthly up to nine months after delivery. At each visit after delivery, information on breastfeeding using the two methods (24 hours recall and recall-since-birth) was collected. RESULTS: The prevalence of EBF dropped from one month to six months when using both the 24 hours recall and the recall since birth methods, but at different rates. At six months, 24.2% of the mothers practiced EBF when measured with the recall since birth method, compared to 38.8% when measured with the 24 hour recall. Predictors of EBF were also different. When using the recall since birth method, women who had received counseling on infant feeding had increased odds of practicing EBF compared to those who did not receive counseling, [AOR=2.3; 95% CI (1.2, 3.7)]. When using 24 hours recall, women who were unemployed had increased odds of practicing EBF compared to those who were employed [AOR=1.5;95% CI(1.1,2.5)], and women aged 35 - 49 years had decreased odds of practicing EBF compared to younger women[AOR=0.28; 95 % CI(0.1,0.7)]. CONCLUSIONS AND GLOBAL HEALTH IMPLICATIONS: The two methods for EBF give substantially different results, both in the prevalence of EBF and factors associated with EBF. The higher EBF obtained with 24 hours recall represents an overestimation and thereby an overly positive picture of the situation.

Facilitators and Barriers to Breastfeeding and Exclusive Breastfeeding in Kilimanjaro Region, Tanzania: A Qualitative Study.

BACKGROUND: Breastfeeding is the best way to feed infants. It is a simple intervention to improve child health and development. Despite its advantages, there is a low global rate of exclusive breastfeeding (EBF) and, in Kilimanjaro region, Tanzania, EBF is rarely practiced. The aim of this paper is to explore social and cultural factors that might influence the practice of breastfeeding and exclusive breastfeeding in Kilimanjaro region. METHODS: A qualitative design was used. Three districts in Kilimanjaro region, namely, Same, Moshi Municipal Council, and Rombo, were selected. In each district three focus group discussions (FGDs) were conducted with mothers with infants aged 0-12 months. RESULTS: A total of 78 mothers participated in the focus group discussions. A majority of the mothers were positive towards breastfeeding. They believed that it prevents child sickness, creates happiness, and is good for family economy. Despite the positive attitudes, the mothers revealed many perceptions that interfered with breastfeeding and exclusive breastfeeding. These included the following: breast milk is very light and has bad odor, breastfeeding may affect mothers appearance, chango (abdominal pain) has to be treated, there is fear of the evil eye when breastfeeding in public places, breast milk may become unclean, and there is a need of pauses in breastfeeding after the child has burped on the breast. CONCLUSION: There are beliefs that promote the practice of breastfeeding in this setting; these local beliefs could be used to develop breastfeeding messages to improve breastfeeding practices. However, there is also a need to address beliefs that interfere with the practice of exclusive breastfeeding in this setting.

"We give water or porridge, but we don't really know what the child wants:" a qualitative study on women's perceptions and practises regarding exclusive breastfeeding in Kilimanjaro region, Tanzania.

BACKGROUND: World Health Organization (WHO) recommends exclusive breastfeeding (EBF) as the optimal way to feed infants below 6 months of age. The benefits of EBF are well documented. However, in Tanzania, EBF is still rarely practised. This study explored the knowledge, attitudes and practises of EBF among mothers in Kilimanjaro region of northern Tanzania. METHODS: This is a qualitative research study. The three districts in Kilimanjaro region namely Same, Moshi Municipal Council and Rombo districts were selected. In each district, three focus group discussions (FGDs) with mothers of infants aged 0-12 months were conducted. A total of 78 mothers participated in the focus group discussion. RESULTS: The main result is that most of the mothers had a theoretical knowledge of the benefits of EBF but were not able to practise this knowledge for a range of reasons. The reasons for not practising EBF in real life included poor maternal nutrition, the pressure for women to return to work, inadequate knowledge about expressing breast milk, and perceived insufficiency of milk supply. Additionally, mothers received conflicting advice from a range of sources including close relatives, community members and health care providers, and they often choose the advice of their elders. Mothers also offered suggestions on ways to improve EBF including educating the community on the benefits of EBF. CONCLUSION: The results show that the women need support from close relatives and employers to successfully practise EBF. This presents a need for involving close relatives in EBF interventions, as they are important sources of breastfeeding information in the community. Additionally, behavioural interventions that promote optimal breastfeeding practises might help to improve exclusive breastfeeding.

Anaemia among pregnant women in northern Tanzania: prevalence, risk factors and effect on perinatal outcomes.

Anaemia during pregnancy is associated with negative maternal and neonatal outcomes. However, there is limited data regarding prevalence and effects of anaemia during pregnancy in northern Tanzania. The objective of this study was to determine the prevalence and possible risk factors for anaemia and its effect on perinatal outcomes among pregnant women attending antenatal care in Moshi Municipality in northern Tanzania. A cohort of pregnant women aged 14-43 years and in their 3rd trimester, was recruited from two primary health care clinics between June 2002 and March 2004. Interviews, anthropometric measurements and haematological examinations were conducted on 2654 consenting women. Perinatal outcomes were recorded during delivery and at 1 week after delivery. Of the 2654 participants, 47.4% had anaemia (haemoglobin [Hb] <11g/dl), 35.3% had mild anaemia (Hb= 9-10.9g/dl), 9.9% had moderate anaemia (Hb =7- 8.9g/dl), and 2.1% had severe anaemia (Hb < 7 g/dl). Anaemia was significantly more prevalent in HIV-positive (56.4%) than in HIV-negative women (46.7%), (P = 0.01). In logistic regression anaemia was independently associated with maternal HIV (OR= 1.5), malaria (OR= 5.2), clinic of recruitment (OR= 1.5) and low income (OR= 1.9). Pregnant women with anaemia were more likely to have low birth weight (LBW) infants. Compared with non-anaemic women, the risk of LBW was 1.6 times and 4.8 times higher for children born to women with moderate and severe anaemia, respectively. In conclusion, anaemia in pregnancy is a severe public health problem in northern Tanzania. Control of maternal anaemia may be one important strategy to prevent LBW in this setting. Measures to prevent malaria and to control anaemia among all pregnant women irrespective of HIV status, should be strengthened. Outside of the health sector broader approaches for anaemia prevention targeting women of lower income, are required.