Tissue-dependent loss of phosphofructokinase-M in mice with interrupted activity of the distal promoter: Impairment in insulin secretion

Ann Marie T Richard, Dominic Luc Webb, Jessie M. Goodman, Vera Schultz, John N. Flanagan, Lisa Getty-Kaushik, Jude T. Deeney, Gordon C. Yaney, George A. Dunaway, Per Olof Berggren, Keith Tornheim

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Phosphofructokinase is a key enzyme of glycolysis that exists as homo-and heterotetramers of three subunit isoforms: muscle, liver, and C type. Mice with a disrupting tag inserted near the distal promoter of the phosphofructokinase-M gene showed tissue-dependent differences in loss of that isoform: 99% in brain and 95-98% in islets, but only 50-75% in skeletal muscle and little if any loss in heart. This correlated with the continued presence of proximal transcripts specifically in muscle tissues. These data strongly support the proposed two-promoter system of the gene, with ubiquitous use of the distal promoter and additional use of the proximal promoter selectively in muscle. Interestingly, the mice were glucose intolerant and had somewhat elevated fasting and fed blood glucose levels; however, they did not have an abnormal insulin tolerance test, consistent with the less pronounced loss of phosphofructokinase-M in muscle. Isolated perifused islets showed about 50% decreased glucose-stimulated insulin secretion and reduced amplitude and regularity of secretory oscillations. Oscillations in cytoplasmic free Ca2+ and the rise in the ATP/ADP ratio appeared normal. Secretory oscillations still occurred in the presence of diazoxide and high KCl, indicating an oscillation mechanism not requiring dynamic Ca2+ changes. The results suggest the importance of phosphofructokinase-M for insulin secretion, although glucokinase is the overall rate-limiting glucose sensor. Whether the Ca2+ oscillations and residual insulin oscillations in this mouse model are due to the residual 2-5% phosphofructokinase-M or to other phosphofructokinase isoforms present in islets or involve another metabolic oscillator remains to be determined.

Original languageEnglish
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume293
Issue number3
DOIs
StatePublished - Sep 1 2007
Externally publishedYes

Fingerprint

Phosphofructokinases
Muscle
Insulin
Tissue
Muscles
Protein Isoforms
Glucose
Phosphofructokinase-2
Diazoxide
Glucokinase
Genes
Glucose sensors
Glycolysis
Adenosine Diphosphate
Blood Glucose
Fasting
Skeletal Muscle
Liver
Adenosine Triphosphate
Brain

Keywords

  • Adenosine 5′-triphosphate/ adenosine 5′-diphosphate ratio
  • Calcium
  • OmniBank
  • Pancreatic islets

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Biochemistry

Cite this

Tissue-dependent loss of phosphofructokinase-M in mice with interrupted activity of the distal promoter : Impairment in insulin secretion. / Richard, Ann Marie T; Webb, Dominic Luc; Goodman, Jessie M.; Schultz, Vera; Flanagan, John N.; Getty-Kaushik, Lisa; Deeney, Jude T.; Yaney, Gordon C.; Dunaway, George A.; Berggren, Per Olof; Tornheim, Keith.

In: American Journal of Physiology - Endocrinology and Metabolism, Vol. 293, No. 3, 01.09.2007.

Research output: Contribution to journalArticle

Richard, AMT, Webb, DL, Goodman, JM, Schultz, V, Flanagan, JN, Getty-Kaushik, L, Deeney, JT, Yaney, GC, Dunaway, GA, Berggren, PO & Tornheim, K 2007, 'Tissue-dependent loss of phosphofructokinase-M in mice with interrupted activity of the distal promoter: Impairment in insulin secretion', American Journal of Physiology - Endocrinology and Metabolism, vol. 293, no. 3. https://doi.org/10.1152/ajpendo.00168.2007
Richard, Ann Marie T ; Webb, Dominic Luc ; Goodman, Jessie M. ; Schultz, Vera ; Flanagan, John N. ; Getty-Kaushik, Lisa ; Deeney, Jude T. ; Yaney, Gordon C. ; Dunaway, George A. ; Berggren, Per Olof ; Tornheim, Keith. / Tissue-dependent loss of phosphofructokinase-M in mice with interrupted activity of the distal promoter : Impairment in insulin secretion. In: American Journal of Physiology - Endocrinology and Metabolism. 2007 ; Vol. 293, No. 3.
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abstract = "Phosphofructokinase is a key enzyme of glycolysis that exists as homo-and heterotetramers of three subunit isoforms: muscle, liver, and C type. Mice with a disrupting tag inserted near the distal promoter of the phosphofructokinase-M gene showed tissue-dependent differences in loss of that isoform: 99{\%} in brain and 95-98{\%} in islets, but only 50-75{\%} in skeletal muscle and little if any loss in heart. This correlated with the continued presence of proximal transcripts specifically in muscle tissues. These data strongly support the proposed two-promoter system of the gene, with ubiquitous use of the distal promoter and additional use of the proximal promoter selectively in muscle. Interestingly, the mice were glucose intolerant and had somewhat elevated fasting and fed blood glucose levels; however, they did not have an abnormal insulin tolerance test, consistent with the less pronounced loss of phosphofructokinase-M in muscle. Isolated perifused islets showed about 50{\%} decreased glucose-stimulated insulin secretion and reduced amplitude and regularity of secretory oscillations. Oscillations in cytoplasmic free Ca2+ and the rise in the ATP/ADP ratio appeared normal. Secretory oscillations still occurred in the presence of diazoxide and high KCl, indicating an oscillation mechanism not requiring dynamic Ca2+ changes. The results suggest the importance of phosphofructokinase-M for insulin secretion, although glucokinase is the overall rate-limiting glucose sensor. Whether the Ca2+ oscillations and residual insulin oscillations in this mouse model are due to the residual 2-5{\%} phosphofructokinase-M or to other phosphofructokinase isoforms present in islets or involve another metabolic oscillator remains to be determined.",
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AU - Flanagan, John N.

AU - Getty-Kaushik, Lisa

AU - Deeney, Jude T.

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