Abstract:
:The addition of glucose to suspensions of HIT-T15 insulinoma cells caused a small, transient acidification followed by a gradual, progressive alkalinisation, as assessed by the fluorescent pH-sensitive dye 2',7'-biscarboxyethyl-5'-(6')-carboxyfluorescein (BCECF). Treatment of cells with acetate or lactate produced an immediate, marked acidification followed by recovery and a subsequent alkalinisation. In contrast, addition of NH4Cl caused a rapid rise in intracellular pH (pHi) and recovery to resting values. In cells where Na+/H+ exchange was inhibited, either with amiloride or by omission of Na+ from the medium, glucose caused a progressive acidification, whilst recovery from acetate- or lactate-induced acidification was prevented. Under sodium-free conditions, recovery from acidification could be initiated by addition of Na+. Inhibition of HCO3-/Cl- exchange by pretreatment with 4,4'-diisothiocyanatostilbene 2,2'-disulphonic acid (DIDS), or by omission of HCO3- or Cl- from the medium did not affect any of the changes in pHi elicited by the above agents. It is concluded that the principal mechanism responsible for pHi regulation in HIT-T15 cells is the Na+/H+ antiporter and that the HCO3-/Cl- exchange systems make little, if any, contribution.
journal_name
Mol Cell Endocrinoljournal_title
Molecular and cellular endocrinologyauthors
Trebilcock R,Lynch A,Tomlinson S,Best Ldoi
10.1016/0303-7207(90)90070-osubject
Has Abstractpub_date
1990-05-28 00:00:00pages
21-5issue
1eissn
0303-7207issn
1872-8057pii
0303-7207(90)90070-Ojournal_volume
71pub_type
杂志文章abstract::In an effort to identify the signal transduction mechanism associated with the inhibition of juvenile hormone (JH) biosynthesis by the neuropeptides allatostatins, levels of the cyclic nucleotides cAMP and cGMP were measured in corpora allata (CA) of virgin and mated Diploptera punctata females using radioimmunoassays...
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journal_title:Molecular and cellular endocrinology
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更新日期:2020-01-15 00:00:00
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journal_title:Molecular and cellular endocrinology
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更新日期:2018-10-15 00:00:00