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Related Concept Videos

Hormones and Bone Tissue01:17

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Regulation of Food Intake01:30

Regulation of Food Intake

Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
Synthesis and Functions of Calcitonin00:51

Synthesis and Functions of Calcitonin

Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
The exact mechanisms by which calcitonin operates in calcium homeostasis remain elusive, but its significance is evident in several vital...
Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.

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Related Experiment Video

Updated: Jun 23, 2026

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation
09:29

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation

Published on: August 4, 2023

Leptin increases osteoblast-specific osteocalcin release through a hypothalamic relay.

Satya P Kalra1, Michael G Dube, Urszula T Iwaniec

  • 1Department of Neuroscience, McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL 32610-0244, United States. skalra@mbi.ufl.edu

Peptides
|May 12, 2009
PubMed
Summary
This summary is machine-generated.

Gene therapy delivering leptin to the hypothalamus improved weight and glucose control in mice. This central leptin treatment also increased osteocalcin, a bone hormone, suggesting a link between bone health and metabolic regulation.

Related Experiment Videos

Last Updated: Jun 23, 2026

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation
09:29

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation

Published on: August 4, 2023

Area of Science:

  • Metabolic research
  • Endocrinology
  • Gene therapy

Background:

  • Leptin deficiency causes obesity, skeletal abnormalities, and insulin resistance.
  • Osteocalcin, produced by osteoblasts, influences bone growth and glucose homeostasis.
  • The link between central leptin action and osteocalcin levels is not fully understood.

Purpose of the Study:

  • To investigate the effects of selective hypothalamic leptin gene therapy on metabolic and skeletal parameters.
  • To determine if increased osteocalcin levels mediate the benefits of central leptin therapy.
  • To assess the impact of central leptin on different mouse models of metabolic dysfunction.

Main Methods:

  • Intraventricular injection of recombinant adeno-associated virus encoding leptin (rAAV-lep) or green fluorescent protein (rAAV-GFP) in wild-type, ob/ob, and Akita mice.
  • Assessment of body weight, fat mass, food intake, insulin levels, blood glucose, and osteocalcin levels.
  • Long-term monitoring of gene expression and physiological parameters.

Main Results:

  • Selective hypothalamic leptin expression reduced weight, fat mass, and food intake in ob/ob and wild-type mice.
  • Central leptin normalized blood glucose in all three genotypes and suppressed insulin levels in ob/ob and wild-type mice.
  • Osteocalcin levels were significantly increased by rAAV-lep treatment, restoring levels in deficient mice and augmenting them in others.

Conclusions:

  • Central leptin gene therapy effectively reverses metabolic and skeletal abnormalities in leptin-deficient mice.
  • Increased osteocalcin levels are a key mediator of central leptin's beneficial effects on glucose and weight homeostasis.
  • Hypothalamic leptin signaling influences bone metabolism and may provide a novel therapeutic target for metabolic disorders.