scholarly journals Aflatoxin and the aetiology of liver cancer and its implications for Guatemala

2021 ◽  
pp. 1-14
Author(s):  
J.D. Groopman ◽  
J.W. Smith ◽  
A. Rivera-Andrade ◽  
C.S. Alvarez ◽  
M.F. Kroker-Lobos ◽  
...  

During the 60 years since the first scientific reports about a relation between aflatoxin exposure and adverse health consequences, both in animals and humans, there has been a remarkable number of basic, clinical and population science studies characterising the impact of this mycotoxin on diseases such as liver cancer. Many of these human investigations to date have focused on populations residing in Asia and Africa due to the high incidence of liver cancer and high exposures to aflatoxin. These studies formed the basis for the International Agency for Research on Cancer to classify the aflatoxins as Group 1 known human carcinogens. In addition, aflatoxin contamination levels have been used in international commodity trade to set the price of various staples such as maize and groundnuts. While there have been many case-control and prospective cohort studies of liver cancer risk over the years there have been remarkably few investigations focused on liver cancer in Latin America. Our interdisciplinary and multiple institutional collaborative has been developing a long-term strategy to characterise the role of aflatoxin and other mycotoxins as health risk factors in Guatemala and neighbouring countries. This paper summarises a number of the investigations to date and provides a roadmap of our strategies for the near term to discern the emergent aetiology of liver cancer in this region. With these data in hand public health-based prevention strategies could be strategically implemented and conducted to lower the impact of these mycotoxins on human health.

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Hongbo Men ◽  
Jamie L. Young ◽  
Wenqian Zhou ◽  
Haina Zhang ◽  
Xiang Wang ◽  
...  

Maternal exposure to cadmium causes obesity and metabolic changes in the offspring, including nonalcoholic fatty liver disease-like pathology. However, whether maternal cadmium exposure accelerates liver cancer in the offspring is unknown. This study investigated the impact of early-life exposure to cadmium on the incidence and potential mechanisms of hepatocellular carcinoma (HCC) in offspring subjected to postweaning HCC induction. HCC in C57BL/6J mice was induced by diethylnitrosamine (DEN) injection at weaning, followed by a long-term high-fat choline-deficient (HFCD) diet. Before weaning, liver cadmium levels were significantly higher in mice with early-life cadmium exposure than in those without cadmium exposure. However, by 26 and 29 weeks of age, hepatic cadmium fell to control levels, while a significant decrease was observed in copper and iron in the liver. Both male and female cadmium-exposed mice showed increased body weight compared to non-cadmium-treated mice. For females, early-life cadmium exposure also worsened insulin intolerance but did not significantly promote DEN/HFCD diet-induced liver tumors. In contrast, in male mice, early-life cadmium exposure enhanced liver cancer induction by DEN/HFCD with high incidence and larger liver tumors. The liver peritumor tissue of early-life cadmium-exposed mice exhibited greater inflammation and disruption of fatty acid metabolism, accompanied by higher malondialdehyde and lower esterified triglyceride levels compared to mice without cadmium exposure. These findings suggest that early-life exposure to low-dose cadmium accelerates liver cancer development induced by a DEN/HFCD in male mice, probably due to chronic lipotoxicity and inflammation caused by increased uptake but decreased consumption of fatty acids.


2021 ◽  
pp. 8-14
Author(s):  
Carson Bullock ◽  
Robert Johanson

Space debris threatens to destroy valuable space infrastructure, but damages from debris are not an inevitability. The scientific community has ideas for how to prevent the creation of new debris and limit the impact of pre-existing debris, but it will take government action to see that vision through. This essay unpacks how we know what we know, in service of ultimately discussing how policy-makers can use predictions of the long-term risks posed by satellites and debris on the orbital environment to more effectively prescribe behavior for operators. Financial incentives for sustainability, including taxation and cap-and-trade systems, have the potential to greatly benefit the safety and reliability of space missions, but they carry a variety of political and economic challenges, particularly at the international level. Now is a critical time to determine a policy strategy for debris management, because negotiations in the near-term may set valuable precedents for controlling the next century of debris proliferation.


2014 ◽  
Vol 10 (02) ◽  
pp. 98
Author(s):  
Jonathan C Javitt ◽  

Background: In recent years, a variety of innovative solutions have been introduced that are designed to improve adherence to blood sugar testing among patients with diabetes, lower glycated hemoglobin (HbA1c), and decrease complications associated with diabetes mellitus. The value of lowering HbA1cin preventing long-term complications of diabetes is broadly recognized. The purpose of this review is to provide an overview of the peer-reviewed literature documenting both the efficacy of mobile health (mHealth) solutions in improving adherence and lowering HbA1c, along with the impact of lowering HbA1con near-term cost and complications of diabetes. Methodology: An extensive search of Index Medicus was performed in order to identify studies documenting the effectiveness of mHealth solutions in reducing HbA1cand documenting the effectiveness of reducing HbA1cin lowering near-term medical costs. Results: Six randomized controlled trials were identified in which the use of mobile monitoring solutions for blood glucose was tested against standard care. All demonstrated a reduction in HbA1c, ranging from 0.35–1.9 percentage points. Ten studies, primarily longitudinal and retrospective in nature, were identified, which evaluated the effectiveness of HbA1creduction on reducing near-term medical costs. Overall, moderate reduction in HbA1cappears to reduce medical costs by 10 % on average in commercially insured populations and 7 % on average in Medicare-age populations. Conclusions: mHealth interventions for diabetes show promise in reducing HbA1cacross multiple settings and achieving this clinical result is likely to result in reduction of near-term medical costs.


Subject Shortcomings in Brazilian infrastructure. Significance The quality of Brazil’s infrastructure is a key business complaint. Infrastructure is viewed as central to boosting the country’s long-term competitiveness, as well as a potential motor of recovery from the economic crisis. However, infrastructure investment remains low. This is due in part to the budgetary restrictions faced by the government, but also to the impact of corruption scandals on leading construction companies. Impacts Better roads, railways and ports will be central to boosting Brazil's exports, notably of primary commodities. Poor infrastructure will continue to affect both business and the daily life of ordinary citizens, particularly in remote regions. The execution of infrastructure investments could produce positive and long-lasting effects on the overall economy.


2018 ◽  
Vol 85 (4) ◽  
pp. 412-452
Author(s):  
William V. Williams ◽  
Louise A. Mitchell ◽  
S. Kathleen Carlson ◽  
Kathleen M. Raviele

Combined estrogen–progestogen contraceptives (oral contraceptives or OCs) and progestogen-only contraceptives (POCs) are synthetic steroids that bind to steroid hormone receptors, which are widespread throughout the body. They have a profound effect on cellular physiology. Combined OCs have been classified by the International Agency for Research on Cancer (IARC) as Group 1 carcinogens, but their findings have not been updated recently. In order to update the information and better understand the impact that OCs and POCs have on the risk of development of cancers, a comprehensive literature search was undertaken, focusing on more recently published papers. In agreement with the IARC, the recent literature confirms an increased risk of breast cancer and cervical cancer with the use of OCs. The recent literature also confirms the IARC conclusion that OCs decrease the risk of ovarian and endometrial cancers. However, there is little support from recent studies for the IARC conclusion that OCs decrease the risk of colorectal cancer or increase the risk of liver cancer. For liver cancer, this may be due to the recent studies having been performed in areas where hepatitis is endemic. In one large observational study, POCs also appear to increase the overall risk of developing cancer. OCs and POCs appear to increase the overall risk of cancer when carefully performed studies with the least intrinsic bias are considered. Summary: OCs have been classified as cancer-causing agents, especially leading to increases in breast cancer and cervical cancer. A review of the recent scientific literature was performed to see whether this still appears to be the case. The recent literature supports the cancer-causing role of OCs especially for breast cancer and cervical cancer. Studies also indicate that progesterone-only contraceptives (such as implants and vaginal rings) also can cause cancer. This is especially true for breast cancer and cervical cancer.


2014 ◽  
Vol 05 (01) ◽  
pp. 1440002 ◽  
Author(s):  
TINO ABOUMAHBOUB ◽  
GUNNAR LUDERER ◽  
ELMAR KRIEGLER ◽  
MARIAN LEIMBACH ◽  
NICO BAUER ◽  
...  

This paper analyzes the results of the climate-energy-economy model, Regionalized Model of Investment and Technological Development (REMIND), to assess the regional costs of climate-change mitigation for reaching the 2°C target with a medium to high likelihood. We assume that the global climate regime remains fragmented until 2020 after which a global mitigation target is adopted. We decompose the regional mitigation costs into (a) domestic and energy trade effects and (b) permit trade effects. Delaying cooperative action affects domestic costs by increasing the energy system's costs as a consequence of lock-in of carbon-intensive infrastructures. This is particularly true in developing countries with low near-term emissions reduction commitments. In a global cap-and-trade system, the effect of delayed action highly depends on whether or not the regions are over- or under-allocated with emissions allowances in the long term. Those with allowances exceeding their long-term emissions will likely benefit from the delay, while others suffer the consequences of higher long-term carbon prices.


1969 ◽  
Vol 16 (4) ◽  
Author(s):  
Yali Friedman

The fates of biotechnology companies can be fairly described as volatile. Clinical trial progress, patent grants and invalidations, and funding announcements can yield great swings in stock price. Building any company is a challenging endeavor, and these dramatic responses only compound the problem and complicate the management of biotechnology companies. Companies have employed a diversity of tactics to buffer the impact of individual setbacks – having multiple products in development, using a hybrid product/service strategy, and in-licensing externally partially developed leads are just a few.One consequence of these buffering strategies is reduced investor interest. The duration of biotechnology product development, combined with the long gap between funding and (potential) revenues, and the uncertainty of profitability encourage investors to favor either late-stage companies or those likely to ‘fail fast’. Late-stage companies often present more measurable investments than early-stage companies – and a shorter timeline to returns – and companies that can fail fast allow investors to conserve time and financial resources. The problem with these investment preferences is that for a company to mature to late-stage, it must find early- and mid-stage funding somewhere, and an excessive focus on failing fast is at odds with the long-term patient support needed for many projects.Therefore, how can biotechnology executives bridge the gap between biotechnology funding preferences, chaotic development progress and the sustained support needed for research projects? One answer is to seek opportunities in compatible industries. Seeking funding and revenue opportunities outside the biotechnology industry can effectively dissociate biotechnology companies from the negative constraints of the biotechnology industry, enabling them to mature in more supportive environments while still keeping a long-term focus on lucrative opportunities in biotechnology.Consider the example of Mission Motors. The company, which recently produced the world's fastest motorcycle, is not a motorcycle company; they used the motorcycle (which they are selling for nearly US$70 000 each) to help attract interest in their primary interest, which is software.1 BBK Technologies is an example from the biotechnology industry. BBK has applied fragment-matching algorithms from DNA sequence analysis to matching video sequences.2 With applications in stemming piracy and enabling image or video-based search, the technology clearly has robust applications beyond biotechnology. The extra biotechnology applications also serve as robust evidence of the utility of BBK's technology.What is not to like about these indirect paths? They can be slower than maintaining a strict focus on biotechnology-related goals. An oft-heard plea in biotechnology is the need for speed in development. Although it is true that patients may be suffering while treatments are in development, and that delays in development may result in a shorter duration of patent protection, a balance must still be maintained between speed of development and corporate sustainability. After all, an excess focus on near-term positive outcomes may lead to corporate collapse, likewise depriving patients of treatments. Leveraging opportunities outside of biotechnology to establish proof of principle or to build revenue streams can increase resilience, and can thereby provide a stronger foundation for corporate sustainability.References Dumaine, B. (2010) A motorcycle on a mission. Fortune, 14 June, p. 30.The physics arXiv blog. (2010) Sequencing the video genome. 31 March, http://arxiv.org/abs/1003.5320.


2021 ◽  
Vol 18 ◽  
Author(s):  
Li-Min Wei ◽  
Cheng-Ye Zhou ◽  
Wang-Qian Ge ◽  
Jia-Sheng Huang

Background: The association between atrial fibrillation (AF) and the prognosis of intravenous thrombolysis (IVT) in patients with acute ischemic stroke (AIS) is debated. Hypokalemia is highly prevalent in patients with AF. We aimed to investigate the effect of hypokalemia and AF on the prognosis of AIS patients following IVT. Method: AIS patients undergoing IVT were enrolled and divided into four groups: normokalemia and non-AF, normokalemia and AF, hypokalemia and non-AF, hypokalemia and AF. Logistic regression was applied to analyze the impact of hypokalemia, AF, and their combination on the prognosis of patients. Results: The analysis included 567 patients, 184 with 3-month poor prognosis (modified Rankin Scale score of 3-6). Following adjustment of risk factors, hypokalemia and AF increased the risks for 3-month poor prognosis (adjusted Odds Ratios (aOR) = 4.97; 95% confidence interval (CI), 1.99–12.44, P =.001), early neurological deterioration (END) (aOR=7.98; 95% CI, 3.55–17.95, P <.001), 1-year poor prognosis (aOR=5.05; 95% CI, 1.99–12.81, P =.001), 1-year all-cause death (aOR =6.95; 95% CI, 2.35–20.56, P <.001). Patients with normokalemia and AF merely increased the risk of 1-year all-cause death (aOR=2.69; 95% CI, 1.10–6.61, P=.013). Patients with hypokalemia and non-AF were not associated with any poor prognosis. There were combined and interactive effects of hypokalemia with AF on the 3-month poor prognosis (P for interaction =.039) and END (P for interaction=.005). Conclusion: Hypokalemia and AF synergistically increased the risk of near-term poor prognosis, END, long-term poor prognosis, and all-cause death of AIS patients following IVT.


2011 ◽  
Vol 70 (1) ◽  
pp. 5-11 ◽  
Author(s):  
Beat Meier ◽  
Anja König ◽  
Samuel Parak ◽  
Katharina Henke

This study investigates the impact of thought suppression over a 1-week interval. In two experiments with 80 university students each, we used the think/no-think paradigm in which participants initially learn a list of word pairs (cue-target associations). Then they were presented with some of the cue words again and should either respond with the target word or avoid thinking about it. In the final test phase, their memory for the initially learned cue-target pairs was tested. In Experiment 1, type of memory test was manipulated (i.e., direct vs. indirect). In Experiment 2, type of no-think instructions was manipulated (i.e., suppress vs. substitute). Overall, our results showed poorer memory for no-think and control items compared to think items across all experiments and conditions. Critically, however, more no-think than control items were remembered after the 1-week interval in the direct, but not in the indirect test (Experiment 1) and with thought suppression, but not thought substitution instructions (Experiment 2). We suggest that during thought suppression a brief reactivation of the learned association may lead to reconsolidation of the memory trace and hence to better retrieval of suppressed than control items in the long term.


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