What question did this study set out to answer?

To determine the precise segmental localization of sodium and chloride transport pathways within early versus late segments of the mammalian renal distal tubule.

September 1, 1987AJP Renal Physiology

Thiazide-sensitive sodium chloride cotransport in early distal tubule

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Authors

DEDavid H. EllisonHeart Failure & Transplant HVHeino VelázquezYale University FWFay WrightNorthern Westchester Hospital

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Implication

In vivo perfusion study reveals that thiazide-sensitive sodium chloride cotransport occurs exclusively in early distal segments in rats, indicating distinct regional mechanisms of renal salt handling.

Key Points

To determine the precise segmental localization of sodium and chloride transport pathways within early versus late segments of the mammalian renal distal tubule.
Perfused early (14–38% of total distal length) and late (61–83% of total distal length) segments of distal tubules separately in vivo in anesthetized rats.
Measured sodium absorption under perfusion with physiological distal fluid (75 mM Na, 68 mM Cl) and interstitial-like fluid (148 mM Na, 110 mM Cl).
Tested the inhibitory effects of 10⁻³ M chlorothiazide and complete luminal chloride removal on sodium transport across both segments.
Perfusion with normal distal-like fluid yielded similar sodium absorption in early (68 ± 29.6 pmol·min⁻¹·mm⁻¹) and late segments (67 ± 27.5 pmol·min⁻¹·mm⁻¹), whereas interstitial-like fluid produced significantly higher transport in early (276 ± 28.4 pmol·min⁻¹·mm⁻¹) compared to late segments (113 ± 29.7 pmol·min⁻¹·mm⁻¹).
Chlorothiazide (10⁻³ M) reduced sodium and chloride absorption to zero in early distal tubules but had no significant inhibitory effect in late distal tubules.
Complete removal of chloride from luminal perfusate selectively decreased sodium absorption in early distal segments without affecting late distal segments.

Cite This Study

Ellison et al. (1987) studied this question.

synapsesocial.com/papers/6a7f5aaac47bc9bb3efbecf1 https://doi.org/10.1152/ajprenal.1987.253.3.f546

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Thiazide-sensitive sodium chloride cotransport in early distal tubule

Discussion

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Implication

Key Points

Cite This Study

Thiazide-sensitive sodium chloride cotransport in early distal tubule

Discussion

Member takes

Implication

Key Points

Cite This Study

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