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Aquaporins01:25

Aquaporins

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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Regulation of Water Intake01:25

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Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
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The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
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Endocrine Signaling01:45

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Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
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Hunger and thirst are fundamental physiological drives crucial for maintaining homeostasis and ensuring the survival of both humans and animals. These drives are regulated through complex interactions between the brain, hormones, and sensory receptors.
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Regulation of Water Output01:26

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The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...
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Aquaporins in Obesity.

Inês V da Silva1,2, Graça Soveral3,4

  • 1Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal.

Advances in Experimental Medicine and Biology
|January 30, 2023
PubMed
Summary

Aquaporins (AQP) are key players in glycerol metabolism and energy balance, impacting obesity and metabolic syndrome. Targeting AQP, especially AQP7 in fat tissue, offers a novel therapeutic strategy for metabolic disorders.

Keywords:
AquaporinsObesityWater transport

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Area of Science:

  • Physiology
  • Metabolic Disorders
  • Molecular Biology

Background:

  • Obesity is a major metabolic disorder linked to cardiovascular risks like insulin resistance, diabetes, dyslipidemia, and hypertension, collectively known as Metabolic Syndrome.
  • Aquaporins (AQP), specifically aquaglyceroporins, are membrane channels crucial for glycerol transport, influencing lipid balance and energy homeostasis.
  • Dysregulation of AQP is implicated in various pathophysiological mechanisms, including insulin resistance, obesity, and diabetes.

Approach:

  • This review synthesizes current knowledge on the physiological roles of aquaglyceroporins in glycerol metabolism and lipid homeostasis.
  • It details the tissue-specific distribution of these channels and their involvement in glycerol balance.
  • The review also examines the implications of AQP in obesity and associated fat-related metabolic complications.

Key Points:

  • Aquaporins facilitate glycerol release from adipose tissue and its distribution, playing a vital role in energy metabolism.
  • AQP7, particularly in adipose tissue, is highlighted for its significant involvement in glycerol balance and fat metabolism.
  • Understanding AQP function provides insights into the molecular mechanisms underlying obesity and related metabolic disturbances.

Conclusions:

  • Aquaporins are integral to maintaining lipid balance and energy homeostasis, with implications for metabolic health.
  • Targeting aquaglyceroporins, especially AQP7, presents a promising avenue for developing novel therapeutic strategies.
  • Pharmacologic modulation of AQP expression and function could offer a new approach to managing obesity and other metabolic disorders.