臓のα細胞は機能的に異質で,隣接する内分泌細胞によって性的に調節される
bioRxiv : the preprint server for biology
|September 5, 2025
まとめ
アルファ細胞のグルコースとパラクリンの調節は,性差を示している. インスリンとソマトスタチン受容体がアルファ細胞のカルシウム動態を微調整し,代謝疾患におけるグルカゴン分泌に影響する.
科学分野:
- 内分泌学
- 細胞生物学
- 代謝に関する研究
背景:
- アルファ細胞 (α細胞) のグルコースおよびパラクリン因子による調節は,特に性に基づく変動については完全に理解されていません.
- 島内細胞のコミュニケーションを調査することは,グルコースホメオスタシスを理解するために不可欠です.
研究 の 目的:
- パンクレア小島内のα細胞と隣接するβ細胞とδ細胞のカルシウム (Ca2+) ダイナミクスを正確にマッピングする.
- インスリン受容体 (InsR) とソマトスタチン受容体 (SSTR) がα細胞のグルコース反応と性別の違いにおいて果たす役割を明らかにする.
主な方法:
- GluCre:GCaMP6fマウスからの臓のスライスに高度なカルシウム画像を用いた.
- InsRとSSTR2/3の信号伝達経路を選択的に阻害した.
主要な成果:
- 観察された異質なα-細胞 Ca2+振動はβ-細胞に対して反相であり,δ-細胞と逆相関している.
- InsRとSSTR2/3を阻害すると,α細胞が活性化し,β細胞の反応が変化した.
- InsRとSSTR2/3の阻害に対するα細胞の特定性敏感性.
結論:
- 島内パラクリン信号はα細胞のグルコース反応を微調整する.
- 性別特有のパラクリンメカニズムは,グルカゴン分泌に影響を与え,代謝疾患に寄与する可能性があります.
関連する概念動画
Cells and Secretions of the Pancreas
2.9K
The pancreas, a vital organ within the abdominal cavity, plays dual roles in the digestive and endocrine systems, collaborating with exocrine and endocrine cells to maintain optimal digestion and blood sugar levels.
Exocrine function is carried out by acinar cells, organized into clusters known as acini. These cells contribute to digestion by releasing substantial quantities of enzyme-rich, alkaline digestive juices.
Concurrently, the dispersed clusters of endocrine cells throughout the...
Exocrine function is carried out by acinar cells, organized into clusters known as acini. These cells contribute to digestion by releasing substantial quantities of enzyme-rich, alkaline digestive juices.
Concurrently, the dispersed clusters of endocrine cells throughout the...
2.9K
Glucose Homeostasis: Pancreatic Islets and Insulin Secretion
1.4K
The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are...
Insulin and C-peptide are...
1.4K
The Endocrine System
533
The endocrine system is an extensive network of glands – organs or tissues in the body that create chemicals that control many bodily functions, that secrete hormones, which are chemical messengers that play essential roles in regulating various bodily functions. These hormones are secreted into the bloodstream and travel throughout the body. They require specific receptors to convey signals to cells possessing these corresponding receptors. This complex signaling mechanism ensures that...
533
Structures of the Endocrine System
8.4K
The intricate framework of the endocrine system encompasses a diverse array of glands, with their target tissues and organs strategically distributed throughout the body. Central to this network are the endocrine glands, specialized structures that lack ducts and release hormones directly into the interstitial fluid. Notably, the hypothalamus, a vital neuroendocrine organ situated in the brain, governs neural functions and serves as a potent source of hormonal regulation. Near the hypothalamus...
8.4K
Target Cell Response to Hormones
3.5K
Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...
3.5K
Regulation of Hormone Secretion
4.0K
Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
Humoral...
Humoral...
4.0K


