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Obesity01:24

Obesity

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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in...
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Drug Dosing: Obese Patients01:21

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In the United States, obesity is a prominent concern. It is linked to heightened mortality rates due to increased occurrences of conditions such as hypertension, atherosclerosis, coronary artery disease, and diabetes compared to nonobese individuals. A patient is classified as obese if their actual body weight surpasses the ideal or desirable body weight by 20%, based on Metropolitan Life Insurance Company data. Ideal body weights consider average weights and heights for males and females...
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Obesity significantly alters the pharmacokinetic processes of drug absorption and distribution, presenting unique challenges in medical treatment. The increased fat tissue and decreased lean muscle in obese individuals can significantly affect how drugs are absorbed into the body and distributed across different tissues. This alteration can lead to variances in the effectiveness and safety of medications, necessitating adjustments in dosing or drug selection for obese patients.One notable...
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Drug metabolism, a critical process in the liver, involves two primary phases: Phase I reactions and Phase II conjugation. Obesity introduces significant alterations in this metabolic process, primarily due to fatty infiltration of the liver, leading to conditions such as nonalcoholic fatty liver disease (NAFLD). This condition can modify the activities of both Phase I and II enzymes, impacting how drugs are metabolized in obese patients.Phase I metabolism sees variable effects across...
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What are Cells?01:07

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Cells are the smallest and basic units of life, whether it is a single cell that forms the entire organism, e.g., in a bacterium or trillions of them, e.g., in humans. No matter what organism a cell is a part of, they share specific characteristics.
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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
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CD36- and obesity-associated granulosa cells dysfunction.

Ru-Xing Wu1, Ying-Ying Dong2, Pei-Wen Yang1

  • 1Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jie Fang Avenue, Wuhan 430030, China.

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Obesity negatively impacts granulosa cell (GC) function, partly due to CD36 overexpression. This study reveals CD36 as a key player in obesity-related GC dysfunction, highlighting its role in impaired fertility.

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Area of Science:

  • Reproductive Biology
  • Endocrinology
  • Cell Biology

Background:

  • Obesity is known to impair granulosa cell (GC) function, but the specific molecular mechanisms are not fully understood.
  • Polycystic ovary syndrome (PCOS) is a common endocrine disorder often associated with obesity and fertility issues.

Purpose of the Study:

  • To investigate the molecular mechanisms by which obesity affects GC function in both PCOS and non-PCOS individuals.
  • To identify specific genes and pathways involved in obesity-induced GC dysfunction.

Main Methods:

  • Microarray analysis of gene expression profiles in GCs from four patient groups: non-PCOS obese (NPO), PCOS obese (PO), PCOS normal weight (PN), and non-PCOS normal weight (NPN).
  • Validation of CD36 expression at both protein and functional levels in GC lines.
  • Inhibition studies using sulfo-N-succinimidyloleate, a CD36 inhibitor.

Main Results:

  • CD36 was identified as a significantly upregulated and intersecting gene in obese (NPO and PO) compared to normal weight (NPN) individuals, but not in PN.
  • Increased CD36 protein levels were observed in GCs from obese patients.
  • CD36 overexpression in GC lines led to reduced proliferation, increased apoptosis, inhibited oestradiol secretion, and altered lipid metabolism.

Conclusions:

  • Obesity, with or without PCOS, represents distinct conditions impacting GC function.
  • CD36 overexpression in GCs of obese patients is a significant mechanism contributing to impaired GC function and potential fertility issues.