What question did this study set out to answer?

To investigate the presence, biochemical properties, and regulation of renin-angiotensin system components in rat vascular tissue extracts and cultured aortic smooth muscle cells.

May 1, 1984Hypertension

Investigations of components of the renin-angiotensin system in rat vascular tissue.

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Population

Rat vascular tissue, including spontaneously hypertensive rats and normotensive controls.

Comparison

Biochemical characterization and in vitro… vs Plasma, renal cortex, veins, and normotensive…

Design

Preclinical

Authors

JRJ. RosenthalUniversität Ulm BPBeate PfeifleUniversität Ulm MMMichail Lubomirov MichailovNational Sports Academy Vassil Levski

Discussion

Member takes

Implication

Suggests vascular RAS as potential therapeutic target in hypertension models; leaves open translation to human disease and treatment.

Key Points

To investigate the presence, biochemical properties, and regulation of renin-angiotensin system components in rat vascular tissue extracts and cultured aortic smooth muscle cells.
Evaluated biochemical profiles (pH optima, isoelectric points, and sensitivity to inhibitors MK-421 and MK-422) of angiotensin-forming and converting enzymes across rat aortic homogenates, cultured smooth muscle cells, plasma, and renal tissue.
Measured and compared vascular enzyme activity levels and characteristics between spontaneously hypertensive rats and normotensive control rats.
Identified two local angiotensin I-forming enzymes in aortic extracts with isoelectric points and pH optima distinct from plasma, renal, and venous enzymes.
Aortic angiotensin-converting enzyme exhibited biochemical differences from plasma enzyme, with both forming and converting enzyme activities elevated in spontaneously hypertensive rats.
Observed potent angiotensin I- and II-degrading enzymes in vascular tissue, where high AI/AII immunoreactivity ratios indicated degrading enzymes act as rate-limiting steps for AII formation.

Structured PICO

Population

Rat vascular tissue (aortic homogenate extracts and aortic smooth muscle cells cultivated in vitro), including spontaneously hypertensive rats (SHR) and normotensive controls.

Intervention

Biochemical characterization (isoelectric points, pH optima) and in vitro testing with ACE inhibitors MK-421 and MK-422.

Comparator

Plasma, renal cortex, veins, and normotensive controls.

Outcome

Biochemical characteristics (isoelectric points, pH optima) and activities of angiotensin I-forming enzymes (AIFE) and ACE.surrogate

The study provides biochemical evidence supporting the existence of an intrinsic vascular renin-angiotensin system that is upregulated in spontaneously hypertensive rats.

Cite This Study

Rosenthal et al. (1984) studied this question.

synapsesocial.com/papers/6a72dd742037e8ceb7087477 https://doi.org/10.1161/01.hyp.6.3.383

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Investigations of components of the renin-angiotensin system in rat vascular tissue.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Investigations of components of the renin-angiotensin system in rat vascular tissue.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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