Abstract
Nonalcoholic Liver Disease (NAFLD) is considered a wide spectrum progressive disease and has emerged as a major cause of chronic liver disease worldwide. It has a global prevalence of 24%, an increasing incidence in both adults and children, in parallel with the pandemic burden of obesity, Type 2 Diabetes Mellitus (T2DM) and Metabolic Syndrome (MS). The pathogenic drivers are still unknown and are not likely to be identical among all patients. The natural history of NAFLD is not linear: it progresses to Nonalcoholic Steatohepatitis (NASH) in 10–30% of the cases, and about 10–15% of NASH patients progress to cirrhosis. The major cause of mortality of NAFLD patients is cardiovascular disease (CVD), being liver-related mortality only the third cause. New valid markers to distinguish patients who progress to either cirrhosis or CVD and new treatments are still to be developed. In spite of the great efforts devoted to achieving these goals, real options for new non-invasive markers for the diagnosis of NASH-cirrhosis and new therapeutic agents are still limited. This chapter will discuss the most updated data about the epidemiology, risk factors, pathogenesis, available experimental models, new diagnostic tools and new treatment options for NAFLD and NASH.
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1.1 Questions
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1.
Which statement is true?
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(a)
NAFLD/NASH treatment is nowadays based only on lifestyle changes, but it is enough to reach at least a reduction of 10% of the body weight to obtain a normalization of liver enzymes.
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(b)
The diagnosis of NASH could be reached with non-invasive diagnostic markers.
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(c)
The average prevalence of NAFLD worldwide is 35%.
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(d)
Metformin, the most prescribed oral antidiabetic drugs, cannot be used in patients with NASH.
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(a)
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2.
Which statement is true?
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(a)
Lean NAFLD has a relatively benign clinical course with lower risk than NAFLD in obese subjects.
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(b)
Among the experimental models, the in vitro systems are the best alternatives to reproduce the events involved in the progression of the disease.
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(c)
In vivo models have played a vital role in the elucidation of the pathophysiological mechanisms of NAFLD; and there is wide variety of animal models to study this disease mimicking the human scenario.
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(d)
The multifactorial nature of NAFLD hampers the progression in the field of pathophysiology and treatment.
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(a)
1.2 Answers
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1.
Which statement is true?
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(a)
CORRECT ANSWER: There are more than 200 clinical trials ongoing which explore different molecules belonging to different family of drugs, but still no drugs are approved to be used in the market worldwide.
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(b)
The only possibility to make diagnosis of NASH is to perform liver biopsy, which remains still the gold standard for the diagnosis of NASH.
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(c)
The real prevalence of NAFLD in the general population is ranging between 25% to 30% and could varies according to ethnicity, aged, sex, and the presence of co-morbidities such as type 2 diabetes mellitus, obesity, hypercholesterolemia, hypertension, etc.
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(d)
All the drugs that are currently used in patients with type 2 diabetes mellitus and NAFLD/NASH should be continued even in the presence of NASH.
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(a)
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2.
Which statement is true?
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(a)
Lean NAFLD usually presents fewer comorbidities, for this reason, is commonly believed that this subgroup would follow a relatively benign clinical course. However, NASH prevalence in obese and nonobese has been reported to be similar. Moreover, the presence of advanced fibrosis in nonobese NASH patients is similar to the observed in obese subjects.
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(b)
The currently available in vitro models cover a wide spectrum of variables, spanning from a simple cell culture or co-cultures (of two or more cells) exposed to different lipid mixtures, to more sophisticated 3D systems. However none of this experimental systems fulfil the all the events involved in the progression of the disease.
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(c)
Due to the complex, multidirectional pathophysiology involved in NAFLD, the perfect animal model representing the complete spectrum of the disease in a workable time frame does not exist and translation of the results to human scenario has repeatedly failed.
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(d)
CORRECT ANSWER: The complexity in the field of NAFLD is not limited to its pathophysiology, but also to the development of valid platforms for the discovery of therapeutic agents.
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(a)
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Rosso, N., Bellentani, S. (2020). Nonalcoholic Fatty Liver Disease: A Wide Spectrum Disease. In: Radu-Ionita, F., Pyrsopoulos, N., Jinga, M., Tintoiu, I., Sun, Z., Bontas, E. (eds) Liver Diseases. Springer, Cham. https://doi.org/10.1007/978-3-030-24432-3_26
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DOI: https://doi.org/10.1007/978-3-030-24432-3_26
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