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<p>Glucose and paracrine regulation of α-cells, particularly with respect to sex differences, is still poorly understood. Here, we imaged islets from GluCre:GCaMP6f mice in pancreatic slices, additionally loaded with a red Ca²⁺ indicator, to precisely interrogate Ca²⁺ dynamics in α-cells and the adjacent β- and δ-cells. During a glucose ramp (1.8-10.8 mM), α-cell Ca²⁺ oscillations were heterogeneous, antiphasic to β-cells, and inversely correlated with δ-cells. Selective inhibition of insulin receptor (InsR) and somatostatin receptor subtypes-2 and 3 (SSTR2/3) shifted the majority of α-cells to hyperactivity, delayed the decline of α-cell activity and onset of β-cell Ca²⁺ oscillations during the ramp. While female α-cells exhibited greater sensitivity to SSTR2/3 inhibition, male α-cells were more responsive to InsR blockade. Under complete SSTR2/3 and InsR antagonism, α-cells exhibited elevated Ca²⁺ oscillations but remained glucose-dependent. We conclude that intra-islet coordination fine-tunes α-cell glucose responses, with sex-specific paracrine signaling potentially shaping glucagon profiles in metabolic disease.</p>

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Pancreatic α-cells are functionally heterogeneous and sex-dependently regulated by neighboring endocrine cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月23日

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  • Ya-Chi Huang,
  • Marjan Slak Rupnik,
  • Guy A. Rutter

摘要

Glucose and paracrine regulation of α-cells, particularly with respect to sex differences, is still poorly understood. Here, we imaged islets from GluCre:GCaMP6f mice in pancreatic slices, additionally loaded with a red Ca²⁺ indicator, to precisely interrogate Ca²⁺ dynamics in α-cells and the adjacent β- and δ-cells. During a glucose ramp (1.8-10.8 mM), α-cell Ca²⁺ oscillations were heterogeneous, antiphasic to β-cells, and inversely correlated with δ-cells. Selective inhibition of insulin receptor (InsR) and somatostatin receptor subtypes-2 and 3 (SSTR2/3) shifted the majority of α-cells to hyperactivity, delayed the decline of α-cell activity and onset of β-cell Ca²⁺ oscillations during the ramp. While female α-cells exhibited greater sensitivity to SSTR2/3 inhibition, male α-cells were more responsive to InsR blockade. Under complete SSTR2/3 and InsR antagonism, α-cells exhibited elevated Ca²⁺ oscillations but remained glucose-dependent. We conclude that intra-islet coordination fine-tunes α-cell glucose responses, with sex-specific paracrine signaling potentially shaping glucagon profiles in metabolic disease.